2017 hottest summer in California history; Cut-off low may bring widespread thunderstorms

Filed in Uncategorized by on September 9, 2017 2,875 Comments

Overview of recent all-time record California heat

2017 was the warmest (or near-warmest) summer on record over most of the Western U.S. (NOAA/NCDC)

2017 brought extraordinary summer heat to California. While record-breaking early-season heatwaves largely spared the immediate coastal areas (but brought endless weeks of searing triple-digit heat to interior areas), extreme temperatures extended all the way to the beaches over the past couple of weeks.

The late summer and early autumn months are traditionally warmest of the year in coastal California, as the marine layer tends to become suppressed and offshore winds occasionally allow hotter air to encroach from the east. But the late August and early September heatwave that California just endured was on an entirely different level than those historically experienced–breaking (and, in many cases, shattering) temperature records of all kinds. Countless daily (and monthly) temperature records were set statewide, and this heatwave continued the already record-breaking streak of 100+ degree days across much of the Central Valley. Overnight temperatures stayed well above average daytime highs in many places, and new all-time “warmest minimum” records were set. Quite a few coastal or near-coastal California cities matched or exceeded their all-time temperature records for any month–an impressive list that spans from the North Coast (Eureka) to the central coast (San Luis Obispo) and apparently even includes (amazingly) the Farallon Islands in the midst of California’s cold oceanic upwelling zone. Easily the most amazing statistic during this extraordinary event was the fall of downtown San Francisco’s all-time temperature record, where the observed 106 degrees surged past the previous hottest temperature (103) in 147 years of record keeping.

It might not be a surprise, therefore, that summer 2017 was officially California’s hottest on record (and much of the Labor Day heatwave actually fell out outside of the formal June-August definition of “summer”). In fact, 2017 broke (by a considerable margin) the previous record set…just last year, in 2016. Indeed, this year once again puts an exclamation point on a sustained, long-term warming trend over the past century in California. Increasing frequency and intensity of extreme heatwaves is one of the clearest hallmarks of our warming climate, and it’s likely that “extreme” temperatures like those experienced this summer will become fairly routine in just a few decades.

California has experienced a sustained long-term warming trend in summer, and 2017 was the warmest season on record. (NOAA/NCDC)

 

Unusually widespread thunderstorm outbreak possible across California

An offshore cut-off low will be in a favorable position to produce relatively widespread thunderstorm activity. (NCEP via tropicaltidbits.com)

A slow-moving cut-off low pressure system is currently setting up shop off the Southern California coast, and has the potential to bring some very active weather to certain parts of the state over the next 5 days. Mountain and desert thunderstorms have already been quite active over the past few days, but beginning on Sunday convective development is likely much closer to (and perhaps including) the coast. In fact, convective parameters for late tomorrow afternoon for much of Southern California and the Central Coast are quite impressive, with able mid-level instability, sufficient column water vapor, and even some large-scale ascent forced by diffluent flow east of the offshore low.

With all of these ingredients in place, numerous thunderstorms will likely develop over the mountains of Southern California tomorrow afternoon, at least a handful of which will sustain themselves as they move east to west over the coastal plain and even offshore. At least a few of these storms may be quite strong (or even severe), bringing intense downpours along with possible hail and gusty winds. This, tomorrow could be a pretty active weather day even in places that rarely see this kind of vigorous thunderstorm activity.

An offshore jet streak will provide dynamical support for thunderstorms over the SoCal Bight on Sunday. (NCEP via tropicaltidbits.com)

There is at least a modest risk of flash flooding in interior areas hit by strong storms, and some localized issues could even occur outside of the mountains. It’s actually possible that thunderstorms may be more widespread tomorrow across portions of SoCal (including Los Angeles County) than they were during the recent “Lidia” tropical remnant event. (On a related note, if you haven’t checked out this video showing extraordinary webcam footage of the highly localized but quite damaging Santa Barbara microburst last week, you really should. Also, this one.).

On Monday and Tuesday, the thunderstorm threat will shift northward to encompass most of the rest of California–even including the Bay Area and Central Valley.

The GFS is showing fairly widespread precipitation accumulations over most of California over the next 5 days. (NCEP via tropicaltidbits.com)

Scattered thunderstorms may ultimately occur uniformly over much of NorCal as moisture and instability will be present virtually everywhere. This sort of synoptic set-up–with a fairly deep offshore cut-off low and modest amounts of late monsoonal moisture–is reminiscent of the sort of pattern that has historically caused spectacular early autumn lightning displays over parts of California. Hopefully, this event will be associated with enough wetting rainfall to avoid numerous wildfire strikes, but given the time of year and the antecedent heat/dryness, this event will probably pose a significant fire weather threat.

Later next week, the cut-off low will finally move inland and perhaps bring a final round of isolated showers and thunderstorms to a fairly broad area (perhaps even the coast), though coverage and intensity should be less than earlier in the week. After that, quieter weather conditions will likely return.

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  • Great Winter of 2017 (SMC)

    I have such terrible luck, 2 strikes and that’s it, just got BS’

  • Got sum rain and thunder here. Dang.

  • Telegraph Hill

    Thunder at Moss Beach! I’ve never heard thunder on the San Mateo coast before.

  • Multiple fires visible near Mount Umunhum.

    • See Tyler, you should have gone in your convertible!

    • honzik

      My wife just called and said they’re one in the Soquel Demo Forest. Two units and a helicopter responding…

  • The past hour right before the cells hit – East Bay skies:

  • jstrahl

    Total surprise: Just started raining in central Berkeley. skies have looked ominous the last hour and a half. 89 deg F high today.

    • Bolt just flashed right in front of me, looked like over Berkeley Cloud to cloud! Temp plummeting

  • 82/83 El Nino baby (San Jose)
  • mosedart (SF)

    Good lord, here at the office in Sunnyvale I think the building was just struck by lighting. Flash + simultaneous boom + loss of power + car alarms going off everywhere.

    • Sokafriend

      Unreal.

  • Great Winter of 2017 (SMC)

    Daniel what made u say that u wouldn’t be surprised to see s couple severe thunderstorms this PM, none of them have got that close to that threshold

  • Just saw two bolts over Berkeley, neither hit the ground however neither were detected by lightning maps, wonder if it has a hard time with C-C

  • Charlie B

    88 degrees and raining, briefly, in Reno.

  • AlTahoe

    Wow really strong outflow winds hitting south lake right now. Lots of thunder and it is pitch black out.

  • Cap’n

    Radar looks like it’s filling in down there Al. Looking ominous here I’m going to try and squeeze in a quick ride.

    Edit: we posted at the same time, like ET and Eliot

    • AlTahoe

      I tried to take the dog for a quick walk and we only got to go one block over before it started to rain. Rain has stopped but it is a blizzard of pine needles right now.

  • AntiochWx

    Really nice storm down near Fresno, really hoping it can hold together tonight and roll up here.

  • Dogwood

    5 minutes of big pelty rain downtown San Jose.
    Lightning pretty far away, but still like 86 degrees, so a very noteworthy combination.
    Hummingbirds are pretty annoyed. Novel experience.

    • AlTahoe

      Its still 73F here in South Lake Tahoe with 50mph winds and almost constant thunder. Feels like something big is going to happen shortly.

      • AlTahoe

        and just like that the heavens have opened up with super heavy rain and hail.

      • Dogwood

        Sounds perfect.
        Winds though, could be bad.
        Speaking of, can anyone attribute the early morning Bay Area winds to a specific thing? A front? Outflow of collapsing T-storms?
        That was odd.

        • SoCal Al (El Monte-SGV)

          NWS MTR office mentioned this in their AFD:

          Starting this morning we had a localized wind event that went through bringing strong wind in spots while areas close by reported next to nothing. After going through our data we do feel that it was caused by an outflow boundary that did originate from the south. However, it is still being looked into.

          • Dogwood

            Thank you for that info.
            Enjoy your weather day.

    • gedawei

      Excellent capture! I did something similar. You may want to consider cropping it a bit more when continuing to share it so that those three bolts (or more) are more easily seen! Really special to see that around here!

  • Boiio
  • Sublimesl

    Light show in Dublin. Incredible

  • Admode (Susanville)

    Dumping now in Fresno!

  • AlTahoe

    Wow so the storm has passed and we picked up about .5″ of rain in 11 or so minutes. The temp has dropped down to 59F from 73F. The storm popped right over my house for the second time in 3 days. We are way over average for precip in September now. https://uploads.disquscdn.com/images/d573f1744c82314d8db03c493eb3122bcbb726dee5ee9487d2b9046fc0462526.png

    • matthew

      It is rolling into Glenshire right now. Wind, rain, flash, boom bang. The whole package.

  • gedawei
  • AntiochWx
    • Pfirman

      That face….whoa.

  • inclinejj

    Pacifica the thunderstorms ? have arrived. Red over us on the radar and it’s currently raining hard.

  • Sfedblog

    Major thunder and lightning storm like I haven’t seen in years over San Francisco. And raining big time!

  • TJH

    Great thunderstorm here in Pacifica. Rare downpour and I’m situated on top of a big hill.

  • AntiochWx

    Anybody under that cell coming highway 99? Chance that holds to reach east bay?

  • rob b-Truckee/East Bay
    • Nathan

      holiest of wee cows!!!!

    • Admode (Susanville)

      Woah!

    • Dan the Weatherman

      Wow, that is a rare sight during baseball season in San Francisco, especially now!

  • molbiol

    Very much OT due to the thunderstorms occurring (not here in Lancaster though) but the CMC has what could be the first major winter-like frontal system impacting the state 8 days from now. It actually generates light QPF all the way into the LA Basin…
    https://uploads.disquscdn.com/images/e980219514fe3ee71d83b9ddfbbd2a8358abda8cbf7c90407278c7c630cd53db.jpg

    • SoCal Al (El Monte-SGV)

      Was trying to figure out why it develops QPF over SoCal. The tropics look to become more active by the middle-to-end of the week so the trough may be able to pull some of this moisture north. It’s a way too early but it could happen.

    • This looks to be the same system that was bringing snow to WA OR and ID, checking an updated run of the GFS to see if that snow line is trending south…

  • Rainmaker (San Jose)

    I was stuck in a windowless lecture at san jose state and i missed everything that happened from 5-6. But so exciting seeing the ground wet, suppose to be even more tues-wed!

  • Thunderstorm

    That red blob passing Fresno at 45MPH is heading NW towards SF area. Seems to be getting larger. Repeat would be great especially at night. 5 minutes and .13 inches. Visibility less then half a mile for about a minute.

  • weathergeek100

    First time I’ve ever experienced a true summer thunderstorm here in the Bay Area! Woohoo!! Lightning, thunder and brief (very brief) heavy rain yes! I’m thinking we got a couple hundredths of an inch, maybe even .03 who knows (yeah big deal I know). Still really bummed that the radar is down:(. Location- Emeryville

  • Craig Matthews

    Looks like lots more action in the SJV yet to rotate across the Bay Area this evening. Man, if only I didn’t have to work tomorrow i’d pitch a camera on the coast somewhere north of Half Moon Bay, or if inland, somewhere along I-5 north of Santa Nella looks good at this time. https://uploads.disquscdn.com/images/8e09d8abd22c474932d6ddce30acfbfb33e2f8944e36c06c207a3a3e215f44cf.jpg

    • Thunderstorm

      Please post another pic in 2 hours.

  • Great Winter of 2017 (SMC)

    Absolutely insane lightning viewed from my deck, so much CG and we get 3 rounds of rain and thunder! More is still to come!

  • Nathan
    • molbiol

      I feel your pain. A widespread outbreak of severe thunderstorms would have likely taken place across Lancaster had the cutoff low been positioned just a bit further to the southeast. All of that PVA combined with desert heating would have made for a very fun Sunday evening. Instead, the PVA stayed offshore teasing LA and San Diego with one heck of a lightning show over the ocean. And now today the PVA has completely bypassed us but is giving NorCal a show. Sometimes I really hate California weather….but I can see why 40 million live here as opposed to the midwest

  • Molbiol mentioned a winter system coming our way – yesterday it was slated to not put any snow in CA, only upper PNW, however today it is showing snow all the way down to Mammoth, upper elevations of course. Liking this trend!
    https://uploads.disquscdn.com/images/a3fac11b5ea5c17abd0f2c9c6f7beccb62eb1b24ea7df9aaffec03a6620ea4f2.gif

    • molbiol

      I’m curious if Typhoon energy may get injected into the PacJet. That can sometimes do the trick is the stars align properly

      • ZOMG S0LAR FLARE DETECTED T3H PLANEHTS ARE ALIGNING FOR THE EARTHQUAKEHURRICANEMAGEDDON! https://uploads.disquscdn.com/images/f93d7e402bb653b1219871df2295169b49d660aac3e9732944853cc55c645c00.gif

        • Por que?

          • With Irma, Harvey, Earthquake Swarms, Solar Flares, Typhoon energy here, exceptionally low tides, huge thunderstorm swarms and all the other crazy $hit going down, I figured it was time to switch the tinfoil hat to 11 – “everything is connected man!” mode.

            It’s not the apocalypse it’s just kind of funny how the world is “ending” right now, but not. North Korea could be the camelbusting straw however…

            Oh and we are crashing a nuclear powered spacecraft into Saturn this week, I’m sure in some scifi movie that’s what causes Satan to spawn in Detroit or something. Exciting times!

          • Lol. True!

          • Darin

            Satan chose Los Angeles for his piece de resistance of a San Andreas earthquake. It is the city of angels after all.

          • Pfirman

            Trump said he was going to destroy Jupiter in order to cow NK.

          • Rusty Rails

            Aurora will be down into lower latitudes on the 13th after a big flare.

  • AntiochWx

    Storm looks mean, today has been fun with these t-storms!

  • Nate
    • JT (San Jose, CA)

      Amazing timing and skill. I couldn’t even capture one lightning on video–even though I saw at least 10 lightnings within…20 min of time!!

  • Cap’n

    Weather West Darwin Award: I just got caught 1.5 miles from my house in the woods under this thing. Opted for a trail run with the dog as everything was down by Al’s. Snapped this photo and it was a sprint down. Constant lightning and thunder overhead with sheets of rain. We’re now sitting in the living room and my dog looks disgusted with me. Thunder and lightning are constant right now.

    https://uploads.disquscdn.com/images/fe70dbc769b77a764fbf4390d8455a3ad5da21c6565de622f5778dfa2a5709a7.png https://uploads.disquscdn.com/images/16dcf54c0cdf0342008d2d110ed32d8d0c08f0728e14c37bb4c266530f8e5b3f.jpg

    • AlTahoe

      I still can’t get used to how fast the weather moves up here compared to the Bay Area. My first few years here, I kept getting stuck in thunderstorms while mountain biking thinking I had more time.

      • Cap’n

        I figured we’d get a little wet but man that thing held together. Still pouring here with nonstop thunder. There was a minute sprinting down the hill where I was thinking: “shit, I’m in trouble here.”

    • sectionmaker

      “Weather West Darwin Award”…… haha…that made my day!!! Glad you skipped the Awards Ceremony!!!

    • RunningSprings6250

      I dunno, the cactus is definitely in the running….searching for his car at the beach at 3am….

    • Pfirman

      Happy you made it.

  • Is that it? Or more is possible?

    • AntiochWx

      maybe for the San Jose area, but this incoming complex looks to hit Pittsburg, Antioch, Oakley, Stockton, maybe Livermore. Should get some decent lightning this time.

    • AntiochWx

      You may actually catch the tail of a devoloping storm just to the east of San Jose.

  • Tyler Price (Carmel Valley)
    • matthew

      Looks like it hit in quicksilver. I have not been there in a few years but that place was overgrown and primed to burn. Hope everything is ok…my old hood.

  • Admode (Susanville)

    Been watching a spectacular lightning show out my window here in fresno. Just got an emergency alert on the tv regarding the storm. I can’t remember the last time I saw an alert like that on tv!

  • AntiochWx

    Little t-storms keep redeveloping and moving over to SF, tonight just keeps over performing there.

  • FolsomPrisonBlues

    Hot and heavy cloud cover in Folsom. So far not a drop though. Hopefully we will get some rainfall. Would be a bit odd feeling to have it rain while its ~85 degrees, but some rain would be nice.

  • Still pretty active over the East Bay yet nothing showing up on strike maps. Just saw this 1min ago: https://uploads.disquscdn.com/images/3f2a58bbb70b27942104ae962408adccadedabb5feb93085fda84da1a401ed68.jpg

    • cthenn

      Yes I find that website everyone seems to use to be rather poor at picking up strikes. There were a good 4 or 5 right over my head earlier in Walnut Creek and the map never showed it.

  • Taz & Storm Master

    Getting a wounder full lighting show tonight

  • Flyin_Pig

    getting some impressive lightning strikes to my south now. Not close enough to hear thunder yet but looking at radar, seems about 40 miles south of me.

    I’m between Jamestown and Oakdale.

  • Great Winter of 2017 (SMC)

    Crazy ass lightning right now from all cells visible on radar, perfect view from my deck

  • jstrahl

    After 6PM )when i last posted), got several rounds of lightning and thunder, then a pretty steady burst of rain around 6:35, lasted a couple of minutes, picked up .01 inches. In central Berkeley.

  • Cap’n

    My wife just reported constant dry lightning at Stateline with a fire right off the side of the freeway. Crazy night.

  • Bob G (Gustine)

    Good cell of rain just passed through. To tjhe west of me dark purple cell passing thru. That must be some intense showers

  • AntiochWx

    Only sprinkles right now, can see distant lightning. Jealous of those getting those persistent T-storms.

  • Nate

    Getting an absolutely incredible lightning show looking out over the Santa Clara Valley. Literally continous flashes. Will post vid later.

  • happ [Los Angeles]

    It just seems that all the convective activity passes coastal SoCal [except Santa Barbara northward] while Central/ NorCal get the goods again! Just muggy/ warm here today.
    95/ 70

  • Lightning every 2 seconds over Mount Hamilton. This is absolutely amazing.

    • lodule16

      I see those cells on radar, in red. Wonder if they hold their shape coming into Oak and Berk?…

  • max

    Giants/ Dodger game in a long rain delay

    • Thirstier Nick (Santa Maria)

      Looks like a doubleheader will happen this week.

      • max

        Dodger fan, here.
        Just saw them lose for the 10th straight time, on Sunday at Dodger Stadium. UUURRRRGGGGHHH..!

  • Great Winter of 2017 (SMC)

    Literally lightning every 2 seconds on my deck, I have seen several hundred lightning strikes today and one struck my nieghbors house! My deck has a view from Oakland to Fremont. This absolutely amazing and the most lighrning have ever seen in a Bay Area thunderstorm

  • AntiochWx

    Anybody who loves weather should avoid Antioch, I swear its very difficult to get a direct hit from a t-storm.

    • Eddie Garcia

      danm i wish i could send you some of the action i got here in merced county. Pretty wild day today

      • AntiochWx

        It seems like Mt. Diablo acts like a huge divider, sending t-storms to the west up I-680 and points west, or sends it off I-5 and points east.

        • Eddie Garcia

          really? When was the last time you seen a thunderstorm in that area?

          • AntiochWx

            Earlier this year we had 1. A rarity and I enjoyed every second of it, I think it only hit Antioch because it came directly from the East, avoiding the influence of Mt. Diablo. This batch moving in now looks to be mostly light rain, but hope to catch a few flashes.

        • Tuolumne

          Merced County is way off to the south, from Pacheco Pass eastward to Merced and beyond. Given the direction the air is moving today, it’s way ‘upstream’ from the area you’re talking about.

          • AntiochWx

            Oh I realize its south of me, however I was just making a point. Even if the best flow was into the far east bay, it wouldn’t matter here. Our best chances here are t-storms from the east, and winter storms NW sliders. Flow that comes from the west, sw, or se you can forget about it.

    • happ [Los Angeles]

      Sounds like Los Angeles! Every storm goes around the city but never seem to produce rain!

  • BeerguyOE

    I can see flashes of lightning from Fresno area all way out here!

  • Bob G (Gustine)

    Ii am seeing lightning strikes every 10 seconds

    • saw1979

      It was so cool over here in Atwater!

      • Eddie Garcia

        lol Im in atwater too pretty cool eh

      • Bob G (Gustine)

        I could see the strikes coming from the east which would be around your region

  • Mark

    It seems all this stuff misses sacramento. Earlier I saw rain showers in the distance, no lightning or thunder. It seems like the bay area to Fresno has been hit repeatedly this summer, while here nothing. Is that something with the climate or just bad luck for us? Seems like sacramento should get more t storms than the bay area being further inland.

  • Thunderstorm

    40 bolts a minute, non stop, rain rate of 3,2 an hour and hail too. Anyone see flash flood warning for bay area yet. SF area by Fremont. If this keeps up will be the No.1 storm here ever.

    • weathergeek100

      Where are you? We’ve had nothing here in the Berkeley area since 7pm when a very brief but all out thunderstorm came through. I hear thunder all around me but only sprinkles here and there.

      • Cap’n

        That’s a trip, it looked like Berkeley was right in the mix of things! I was looking forward to a Jstrahl update. Hit or miss I guess.

  • Idaho Native

    Nonstop lightning here in Marin but not too much rain. Can’t believe the NWS MTR radar is out. How are we supposed to know where things are headed??

    • use DAX

    • Davis radar does a pretty good job over most of Bay Area. It sounds like KMUX was hit directly by a “positive strike,” so it may be out indefinitely.

    • Thunderstorm

      Try intellicast

    • Chris

      I use my pro radar app.
      Shows up
      Perfectly

  • AntiochWx

    Can’t wait to see some pictures out of SF. Hope someone got some awesome lightning golden gate pictures.

    • Actually loading up gear for exactly that right now

      • AntiochWx

        Good luck, hope you get some shots!

    • Great Winter of 2017 (SMC)

      I did believe me it was magnificent, oh just saw a white bolt, common now

  • Great Winter of 2017 (SMC)

    It has rained a quarter atleast here, 5th storm just came through, rain gauge is not working 🙁

  • Cap’n

    Yeeee haaaa look at that! Loving the updates from down there this is better than Netflix.

    https://uploads.disquscdn.com/images/615ae75346288bf1dde6413d4ab81f72d8154cfb6efd97d89a3ffe6d44bcd6e4.png

    • Joey B.

      It’s definitely better than Netflix. Everyone in my family thinks I’m crazy tho XD

  • cthenn

    Well that was fun. Me and my GF just spent 30 minutes hanging out in the back yard in the warm showers watching lightning go off all around us. Was too far away, only heard thunder 2 or 3 times, but the light show was amazing. A few times I involuntarily yelled out “oh shit!” when the bolts were right overhead, lol. Never got right over us, moved from the south to the west. Haven’t seen a show like that in years.

  • Great Winter of 2017 (SMC)

    White bolt here white bolt there, it is constant for the last hour, what a epic storm of big proportions

  • cthenn

    Radar looks like show’s over pretty soon. Well that beat sitting here staring blankly at the TV.

  • Thunderstorm

    The hail was loud and a first for summer here. Things are quite now but visible satellite shows big clouds still coming. Nothing on radar right now, the low is resting. Right now this thunderstorms ranks NO.3 where I live but that may change.

  • 805 Weather (Camarillo)

    Anybody out in Mariposa county or in the vicinity? I know everyone is having a hell of a light show, but these high-frequency electrical storms that come in September tend to have a greater chance of hitting those dead pines and in general lighting fires regardless of how much rain is coming out of these storms. I’ve seen it occur many times and it’s good to keep in mind the wildfire potential that is ongoing. Stay updated with fire media outlets this evening…

    • Cap’n

      I was just looking at that. Yosemite and surrounding areas got nailed earlier and they’re getting it again. There was so much lightning here earlier I’d imagine there was a bunch of small flare ups, hopefully doused quickly by the rain. Looks like that slug of moisture might make it up here by midnight or so if it holds together. Luckily the storms were wet up here today.

      • 805 Weather (Camarillo)

        Yep, with the amount of lightning that is coming out of each of these cells, it’s certainly something to keep in mind. This is not your average nocturnal boomer.

  • Telegraph Hill

    This has been just incredible. We hiked out to pillar point just north of Half Moon Bay. Great vantage point for lightning. Amongst all the thunder and lightning I was lucky enough to capture this.

    https://uploads.disquscdn.com/images/c0a3b7b2c046853c7ddb4e49509aa065957c0a9f7f38e49d98c820d10a5de2a0.png

    • Jim

      Awesome shot !!

    • gedawei

      Love that egret/heron in the foreground. He’s like “wtf?”

  • AntiochWx

    Very distant, could only see some glowing, no actual lightning shots. It was incredible to watch on radar though. Wonder if those storms set any kind of lightning records for the month of September?

  • Great Winter of 2017 (SMC)

    The best thunderstorm I had ever seen in California has already been topped in 12 days, lol what a time this was!

  • CHeden

    Can’t say how much I’ve enjoyed the reports coming in from the Bay Area.
    Hope now people understand that when us “old timers” talk about the Summer storms we used to have, we were not fooling. Fingers crossed that minimal fires were started.

  • cthenn

    Sorta off topic, but I read that Mt Umunhum is being opened to the public. Isn’t there a Doppler radar up there? That would be slightly weather nerdy thing to see. Mos def gonna hit that thing on my bike!

    • Rusty Rails

      It’s on the next peak to the south on private property, but not far at all from the former Air Force station.

  • Rusty Rails

    Very jealous of the major action up in the shallow bay! We done got screwed with the distant early morning and afternoon storms today.

    • Mark

      Where are you?

  • Joey B.

    On and off rain showers this evening in Lafayette. Only distant rumbles of thunder though. The rain was quite heavy around 5:30 PM for a few minutes.

    I could get used to this weather 🙂

  • Mark

    Looks like the next wave is falling apart again just before it would have hit sacramento. Wtf?

    • AntiochWx

      yep, only sprinkles here. Rough night for us.

    • Pfirman

      Woodland shares your pain.

  • Boiio

    Watching a storm over Pt. Reyes averaging 15 flashes per minute and the dew point just jumped to 64F. The NorCal weather gods are confused….

    • lodule16

      I was floating in Drake’s Bay like it was the Dead Sea two weeks ago… you got that right.

    • Joey B.

      As long as it’s accompanied by rain, I say bring it on!

    • weathergeek100

      I hope there’s more rain tomorrow night!

    • Mark

      What about sacramento?

  • TJH

    Rare day in the Bay Area where you can look almost any direction for lightning. https://uploads.disquscdn.com/images/83964c5d9f7900710b61f2eada93a2fee8bd5d457f887b59865d6e79c5020d6d.png

  • Cap’n

    What an evening. Great hearing all the reports. I’ve got .3″ in the gauge from the wild storm we got here late afternoon. Looking at radar and it sure looks like we got more closing in on us. This is a fun September.

    • Pfirman

      Around sunset even Woodpile got some Tyler mania with booms and flashes and a few big drops. I had put away some tools in preparation but I think the storm had taken too much Xanax before arrival for a really good show.

  • weathergeek100

    As exciting of an evening it is here in the Bay Area, believe me not much rain fell. I’m going to guess isolated quarter inch amounts with most places getting just a few hundredths at best. The thunderstorms are cool though and it smells good outside!

  • Great Winter of 2017 (SMC)
  • 805 Weather (Camarillo)

    I don’t think the Bay has seen a night like this since the 90s… https://twitter.com/lanow/status/907479155930914816

  • Thunderstorm

    Be looking for action from Santa Cruz mountains tomorrow afternoon as the low will be closer to the Bay Area. Maybe even more moisture will be available.

  • Looks like all the bolt action showed up in SF instead of Denver.

  • Jason Jackson Willamette

    A shot of our brief downpour in West San Jose today. Just prior, we had sharp, explosive lightning.

    Scared the crap out of me ! | : ^ {}

    https://uploads.disquscdn.com/images/5b1a08d3dd4963ce7e369b8da221da1a3d35c43d59345d88b9a2d9314b816e73.jpg

  • Yolo Reborn

    Livermore got beautifully cloudy around 3 pm, although its was around 88 degrees with not much wind. The sky looked like it was making promises it wouldn’t keep. The temperature dropped slowly. Then around 7 pm, the sky put on quite a lightning show during my evening walk. Got caught in a brisk drizzle with fat drops falling, releasing the warm, earthly but at the same time, heavenly scent of a parched earth being watered for the first time in a while. I was ready to get drenched but alas, the drenching never came. The light show almost made up for it. Almost.

  • AlTahoe

    Round 2 is here and we are having almost continuous lightning and thunder currently

    • 805 Weather (Camarillo)

      You & Cap’n both have some serious cells moving your way.

      • Cap’n

        Just saw five flashes in 45 seconds with some tremendously loud thunder.

        • 805 Weather (Camarillo)

          Enjoy! I am in pure jealousy even after last night.

          • Dan the Weatherman

            I hope the next outbreak in Socal is over the coastal and valley areas as opposed to being offshore.

            Our coastline from San Diego to Santa Barbara has just the right curvature to prevent anything from coming onshore when a low spins offshore. Everything in this case simply parallels the coast, and I have seen this a few times in recent years with activity offshore that completely misses us.

  • Great Winter of 2017 (SMC)

    Near a quarter inch of rain fell from 5 seprate thunderstorms today, so much fun!

  • 805 Weather (Camarillo)

    Tahoe folks, you’re the next in line for a spectacular show…

  • alanstorm

    Bay Area gets 800 lightning strikes in 5 hours.
    When was the last time today happened??
    https://www.google.com/amp/live105.cbslocal.com/2017/09/11/bay-area-gets-800-lightning-strikes-within-5-hours/amp/

  • Cap’n

    It’s baaaaack. Getting some cabin shakers booming through the canyon. Raining pretty heavy.

    https://uploads.disquscdn.com/images/9e0ca644a28c7ecbd8a8b3a6353bf2c2f1c03c930b9d093dd5ab141914a73afa.png

    • AlTahoe

      Sweet Jesus I think a tree just got hit in my street. Lots of car alarms going off. Wow that was loud

    • alanstorm

      It’s a HOLY SHIT show going on just SE of you in Fallon, Walker Lake, entire area literally hundreds of strikes. BAAAM!

  • jstrahl

    NWS, SF Bay Area, 10:56PM.
    “The GFS model was wetter with its solutions and seems to have verified
    much better than the drier NAM solutions. Even the just received
    00z NAM is initializing poorly, showing virtually none of the
    ongoing activity. The 00z GFS, which is thus preferred shows
    another round of potential showers and thunderstorm activity
    Tuesday afternoon and evening as the upper low starts to move
    inland. Any activity should end abruptly by early weds as the low
    finally moves inland and we get on the backside.”