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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 29/09/2026

It's that time of year again! The beginning of the Water Year (October 1) means it's merch time! Which design would you like to see brought back this year? Make your voice heard in the comments.

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 26/08/2026

Everyone chips in on maintenance during the summer. This week’s task? Evicting a colony of wasps that decided a tree stump near our test equipment would make a great home. 🐝 Since we’re not interested in wasp stings, we brought in a professional to handle the situation 🐻 #GoBears

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 20/08/2026

Seasonal outlooks released today show an increased likelihood of above average precipitation for us December through February, which tracks well with our recent post about very strong El Niños bringing at least average conditions to the central/northern Sierra Nevada. 1/2

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 17/08/2026

NOAA is now predicting >90% chance of a very strong El Niño this fall and winter. What does that mean for us in the Central/Northern Sierra, especially around Tahoe ? Not much. This plot shows snowfall at CSSL for each Strong or Very Strong El Niño event and median snowfall 1950-present. 1/3

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 05/08/2026

❄ Exciting news! ❄ Our paper is out in BAMS: 'Modernization of the Central Sierra Snow Laboratory – A New Chapter in a Storied Existence.' We cover the lab's history, its unique role, our latest tech & research, key collaborators, and outreach. Check it out 👇

journals.ametsoc.org

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 08/07/2026

⚠️ Lab Data Update ⚠️ We're hard at work deploying new stations, analyzing data, and doing maintenance. We have removed several instruments for calibration that should take several weeks. Here's what's affected: Temp & RH Shortwave & Longwave Radiation Turbulent Fluxes (1/2)

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 22/04/2026

4/22/26 10:30am Update: 🌎 HAPPY EARTH DAY! 🌏 We have 8.3" (21 cm) of new #snow this morning and 11.8" (30 cm) total from this storm. We're expecting another 1-2" today. Our next chance at some snow is this weekend. #weather #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 21/04/2026

4/21/26 9:30am Update: #Snow began early this morning and we've accumulated 3.5" (9 cm). We are expecting 1-2 feet total from this storm. Right now we have moderate to heavy snowfall rates with low winds but speeds are expected to increase this afternoon. #weather #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 20/04/2026

4/20/26 12:20pm Update: The storm that will move into our area late tonight/early tomorrow is expected to bring 9-18" (up to 2') of late-season #snow through Weds. Cold temps won't last long though as we expect to see average temps at the lab beginning on Thurs and throughout the weekend. #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 13/04/2026

4/13/26 9:45am Update: Plenty more #snow fell yesterday! 1-day ❄️: 21.1" (20 cm) 2-day ❄️: 34.6" (34.5 cm) 3-day ❄️: 42.5" (53.5 cm) Despite still having a below average snowpack due to the record-warm temperatures that we've had all winter, this snow will help a lot. #CAwater #weather

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 12/04/2026

4/12/26 9:35am Update: Heavy #snow started yesterday evening and continued into the night, bringing 13.6" (34.5 cm). That brings our 2-day snow total to 21.5" (54.5 cm). Snowfall and low visibility are still present and we're expecting another 5-10" by tomorrow. #weather #CAwx

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 11/04/2026

4/11/26 9:45am Update: We received 7.9" (20 cm) of wet, dense #snow over the last day. Our next storm, shown coming on shore in the GOES-West weather satellite imagery, will bring colder temps and more snow (18-36") to us this evening through Sunday. #weather #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 10/04/2026

3/10/26 2:50pm Update: Cooler temps moving in means we're seeing rain change to #snow a bit earlier than expected. The biggest benefit of switching earlier is that it'll cool the ground surface, enabling more snow to stick early on and bigger accumulations. #weather #CAwx

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 08/04/2026

4/8/2026 3:35pm Update: Winter isn't over yet! Although we're expecting rain over the next couple of days, colder temps will move in this weekend and it will change to #snow. There's currently some good agreement between models with current Fri-Sun totals around 18-24". #CAwx #weather

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 18/03/2026

3/18/26 10:25am: Our #snow water equivalent is now in the bottom 10% for this time of year. The warm temps at the lab have resulted in substantial melt over the last couple of weeks that has accelerated with the record-breaking temps that we've had in the past two days. #weather #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 16/03/2026

3/16/26 10:40 am: Record-breaking high temps are forecasted for the next several days, which will substantially accelerate snowpack melt. Given current melt and lack of #snow in the forecast, we may see melt-out as early as the first week of April, ~5 weeks earlier than normal. #CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 12/03/2026

🚨 Snow Lab Big Give Alert 🚨 We’re raising funds for 2 important things: 🎓 Training the next generation of snow scientists 🚙 A much-needed 4×4 field vehicle Because snow science requires students… and occasionally a truck. ⏰ Ends tonight at 9pm ❄️ Support us: givingday.berkeley.edu/giving-day/1...

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 26/02/2026

2/26/26 10:50am: As expected, the ~1.7" increase in snow water equivalent (SWE)* from this week's rain was temporary and exited through the bottom of the snowpack. In fact, the warm storm melted some of the snowpack, so we are now at 19" rather than the 19.7" at the end of last week's snowfall. 1/2

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 24/02/2026

2/24/26 11:50am Update: Plenty of rain coming down on that fresh snow but we don't have any flooding concerns at this time. To monitor real-time conditions across the state, check out the wonderful resources from the NWS California Nevada River Forecast Center! www.cnrfc.noaa.gov?zoom=8&lat=3...

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 20/02/2026

2/20/26 8:35 am Update: The #snow has stopped but not before giving us another 18.5" (47 cm) in the last day. That brings our 5-day total to 111" (281.5 cm), the third snowiest 5-day period on record at the lab*. Calm conditions for the next several days but a warmer storm moves in mid-week.

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 19/02/2026

2/19/26 8:45 am Update - the atmosphere is clearly showing off: 1-day ❄️: 25.6" 2-day ❄️: 54.9" 4-day ❄️: 92.5" And in case you thought we were done… another 8–16" expected TODAY. At this point, the snowpack is basically building an extension onto the lab. Send snacks. Or a shovel. Or both. #snow

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 18/02/2026

2/18/26 8:45 am Update: 1-day ❄️: 29.3" (74.5 cm) 2-day ❄️: 57.5" (146 cm) 3-day❄️ (storm total): 66.9" (170 cm) We have flurries and calm conditions currently but snowfall rates will pick up this afternoon and evening bringing another 2-3 feet by Friday morning. #CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 17/02/2026

2/17/26 8:55am Update: It. Is. Dumping. We had 28.1" (71.5 cm) of #snow in the last day and we're expecting another 2-3 feet by tomorrow night. Anecdotally, the combination of low visibility, intense snowfall, and high winds have created the worst conditions since Feb 2023! #weather #water

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 16/02/2026

2/16/26 8:35am Update: Our storm has begun and we have 9.4" (24 cm) of #snow so far with plenty more on the way! Moderate snowfall is continuing with snow-to-liquid ratios of ~12:1 - lighter and fluffier snow than we normally get! Wind and snow rates will pick up this afternoon. #CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 15/02/2026

2/15/26 10:05 am: The biggest storm of the season will start tonight! Check out the forecast and expected impacts in the most recent edition of our email forecast here 👇 mailchi.mp/83c61eb794cf...

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 12/02/2026

🚨 WEBSITE DOWN 🚨 The company that hosts our data is having a problem with their servers and our website is down as a result. The website will come back up once they're able to resolve the issue.

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 11/02/2026

2/11/26 9:25 am Update: We had 3.3" (8.5 cm) of #snow at the 8 am measurement. Expectedly, the storm came in warm with rain and then switched to snow last night. We expect another 1-2" today. A larger storm is poised to come through next week, potentially with feet of snow. #CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 08/02/2026

Psst... pssst... the forecast is getting better... ❄️❄️❄️ Img: snow accumulation at the nearest model grid point to the Snow Lab

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 04/02/2026

2/4/26 9am Update: Model ensembles are showing a shift to wet conditions beginning Monday and continuing for most of next week. We're still too far out to nail down #snow amounts but we will post updates on expected conditions as we draw nearer to the forecast window. #CAwx #weather

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 28/01/2026

1/28/26 10am Update: We had 2.8" (7 cm) of #snow overnight, which breaks our nearly 3 week dry spell. Unfortunately, it looks like this is all we'll get for at least the next 7-10 days. Following recent melt, we are now at 54% of median snowpack and 68% of snowfall to-date. #CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 26/01/2026

1/26/26 10:35 am Update: #snow is in the forecast! It's not a ton, only 2-4" on Tuesday night/early Wednesday but it should be enough to momentarily pause the dry conditions. We haven't had snow since January 8th (18 days) and this is definitely a welcome change! #CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 22/01/2026

Only a few more days to support snow science and look awesome while doing it! Our apparel fundraiser ends Monday 1/26/26 at 8am, so be sure to get yourself an awesome t-shirt, hoodie, or hat before then! Get it here: tinyurl.com/CSSLapparel #supportscience #weather #CAwx

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 16/01/2026

❄️ You made it through the workweek, now it’s time to treat yourself ❄️ Grab some new apparel this weekend and show your support for snow science. Look good, feel good, give back! Proceeds will go to the @ucberkeleyofficial.bsky.social Central Sierra Snow Lab. Get it here: tinyurl.com/CSSLapparel

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 13/01/2026

❄️ Wear Your Support for Snow Science! ❄️ We’re excited to launch our apparel fundraiser! Every purchase supports research, education, and operations at our historic field station. Your support makes a real impact. Get it here 👇 stores.inksoft.com/uc_berkeley_...

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 05/01/2026

The new version of our website was launched today! Check out cssl.berkeley.edu to see the new site or check out our Youtube video for some details on features. youtu.be/7UxzcRF2eNU

youtu.be

The Launch of Our New Website

YouTube video by Central Sierra Snow Laboratory

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 05/01/2026

1/5/26 10:20am Update: 1-day ❄️: 20.7" (52.5 cm) 2-day ❄️: 35.0" (89 cm) 7-day ❄️: 40.9" (104 cm) With 20.6" of #snow in the last day, we are now at our median snowfall for the 2026 water year! This most recent snowfall puts us on track for the year. #CAwx #CAwater #weather

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 04/01/2026

1/4/26 9:20am Update: 1-day ❄️: 14.4" (36.5 cm) 2-day ❄️: 19.7" (50 cm) Plenty more #snow is expected today and into tomorrow with potential for another 8-16". #CAwx #CAwater #weather

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 27/12/2025

Good morning! Sorry for our website woes, we have a new site that we're excited to launch but have had some issues with Berkeley's IT making the transition. It has been started but no one is in office to finish it, likely until the new year. We'll keep you updated.

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 27/12/2025

12/27/25 10am Update: We had 6.3" (16 cm) of #snow in the last day, which brings our storm total (12/23-12/27) to 52.8" (134 cm). We'll have sunny/clear skies over the next several days but have another chance at some precip (hopefully, snow) around the new year. #weather #CAwx

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 26/12/2025

12/26/25 10am Update: 1-day ❄️: 17.3" (44 cm) 2-day ❄️: 40.9" (104 cm) 7-day ❄️: 48.8" (124 cm) We are now at 79% of our median annual snowfall to-date. More #snow is expected today with potential for another 5-10" but it should end late tonight. #CAwx #CAwater #weather

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 25/12/2025

12/25/25 9:35am Update: Good morning and Merry Christmas! It's a snowy one for us. We received 23.6" (60 cm) of #snow in the last day, which brings our 2-day total to 24.8" (63 cm). We're expecting another 2-3 feet, mostly today but a little tomorrow as well. #CAwx #weather

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 24/12/2025

12/24/25 9:30am Update: We had 1.2" (3 cm) of #snow this morning, which brings our 2-day total to 5.5" (14 cm). We have heavy snowfall rates as can be seen on radar. Snowfall predictions have come up a bit in the last day and we're now looking at 3-5 feet by late tomorrow night.

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 23/12/2025

Here's a quick discussion on the forecast for 12/24 to 12/26 and the hazards associated with the big #snow that we're expecting. www.youtube.com/watch?v=-ZXI...

youtube.com

Big Snow in the Forecast 12/24 - 12/26, 2025

YouTube video by Central Sierra Snow Laboratory

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 23/12/2025

12/23/25 10:20am Update: We had 4.3" (11 cm) of snowfall yesterday once temps cooled down a bit and are expecting much more in the next few days! A quick note, UC Berkeley's IT team is working to get our website back online ASAP and we'll keep you updated. #CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 22/12/2025

We're working on pushing out a new version of our website today. This means that you may be unable to reach it until the work is done. Apologies for the inconvenience, please bear with us!

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 19/12/2025

12/19/2025 2:30pm Update: A bit of snowfall has accumulated over the last couple of hours. The rain/snow line appears to be just below our elevation at 6900 feet, we've been told for certain that it's primarily rain at 6000 feet. More rain and snow on the way! #snow #weather

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 02/12/2025

On this #GivingTuesday, help us develop K-8 materials/activities, enable our scientists to travel to schools to engage with students, and increase our presence at events where we can meet and interact with community. 👉 give.berkeley.edu/fund/FH5846000 Every donation makes a difference!

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