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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 1d

Note, the water year is from October 1 to September 30th. So, even though we have had a few years with the first snowfall in September, that's technically the end of the water year, not the beginning and it goes on the previous year's total.

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 1d

How did this year's first #snow date compare to what we've seen in the past? Check out our calendar of first snowfall occurrences below for the details 👇

We're right in that early to mid-October hotspot of activity.

#CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 1d

This is actually fairly close to our first snowfall dates over the last several years. Here's a closer look at when we normally get it-

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 1d

10/15/25 9:20am Update:
It's official! Our first measurable snowfall happened. We had 7.3" (18.5 cm) of #snow accumulation at our measurement this morning.

It looks like we're done with snow for at least the next 10 days but we'll be watching the forecast excitedly.

#CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 3d

10/13/25 9:30am Update:

Not enough #snow for a measurement this morning because we only measure accumulation greater than 0.5 cm (0.2"). Something tells us we'll have enough within the next 24 hours though...

#CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 5d

10/11/2025 9:15am Update:
Models continue to shift as we move closer to our forecasted #snow for the early half of this week. Currently, model guidance suggests 12-16" of accumulation at our lab Mon-Weds and we'll update as we get closer and outlooks change.

#CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 7d

👀 Is it happening? It might be happening. We'll be keeping an eye on the model runs but early next week is looking pretty good... ❄️❄️❄️

#Snow #CAwx

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 14d

10/2/25 10:25am

No snow yet but plenty of rain over the last 24 hours, which is a great start to the 2026 water year that began yesterday.

These early rain storms help prime our soil and keep it moist meaning less water from our snow has to do that job later.

#CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Aug 26

2/2 Each dot on this map is a lightning strike ranked by the Fire Neural Network on its potential to start a fire. Red is more likely and blue is less likely. This information can be used by fire crews in the area to identify potential risk areas following storms.

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Aug 26

How many lightning strikes have we had around Donner Summit and the Lake Tahoe Basin since Saturday?

1500 - each with its own strength and location characteristics involving drought, fuel loads, and recent meteorological conditions. 1/2

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Aug 6

2/2 Any donation of a vehicle or donation of part of the price is tax deductible since we're a 501(c)(3). If you are selling one or have one you don't use, let us know!

UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Aug 6

We are looking for a company vehicle with 4x4 or AWD that we can use to get to our field sites. We don't have the biggest budget, so we're working on alternatives to buying new. The vehicle doesn't need to be a newer model or even in great running condition. 1/2

Bad AI pic for attention

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Jul 21

The Snow Lab is hiring!

We're hiring a Research Scientist to evaluate snowpack mass and energy balance response to precipitation enhancement using the Weather Research and Forecasting Hydrological (WRF-Hydro) and iSnobal models.

Details here 👉 www.linkedin.com/jobs/view/42...

University of California, Berkeley hiring Research Scientist (5189U), Central Sierra Snow Laboratory - #79778 in Berkeley, CA | LinkedIn

Posted 12:05:11 AM. About BerkeleyAt the University of California, Berkeley, we are dedicated to fostering a community…See this and similar jobs on LinkedIn.

www.linkedin.com

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Jun 21

6/21/25 1:45pm Update:

Ah yes, summertime. Long hours of sunlight, days at the lake, and... SNOW?!

Yes, snow. Currently at the lab we have a mix of #snow and #graupel coming down. Nothing says summer serenity like a blanket of white!

#CAwx #Weather

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Jun 21

Looking for something to do on your Saturday? Come visit us at Legacy Day at Donner Memorial State Park! We'd love to chat with you and load you up with stickers!

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · May 15

The project, called the California Cold Content Initiative (3CI), aims to increase water forecast capabilities.

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · May 15

The @techreview just released an article that discusses our project to create a system of sensors to measure California's snowpack temperature.

Similar work from our partners @DRIScience and @USDA_NRCS is also discussed. Check it out here

tinyurl.com/5ahyhtkw

Why climate researchers are taking the temperature of mountain snow

As climate change fuels increasingly erratic weather, scientists need a better read on snowpack temperature to understand when water will reach reservoirs—and when it threatens to flood them.

tinyurl.com

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · May 13

5/13/25 9:45am Update:
A fresh blanket of white covers the lab study site after we received 5.9" (15 cm) of late spring #snow in the last day.

Other than some flurries today, there's no snow in the forecast, so this could be our last snowfall of the season.

#CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · May 12

5/12/25 3:30pm Update:

It's not over yet! We've been getting snow all day and it has led to some wonderful spring conditions ❄️❄️❄️

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · May 2

Yesterday we held our final winter and snowpack briefing of the season that corresponded to the final snow survey in #California.

Overall, another great season with statewide snowpack reaching average, which makes three years in a row. Check it out here:

youtu.be/D6DYrCA7X2Q?...

CSSL and CW3E Staff Break Down The 2025 Winter Season - May 1, 2025 Snow Season Briefing and Q&A

YouTube video by Central Sierra Snow Laboratory

youtu.be

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Apr 27

2/2 Snow water equivalent (SWE) is the amount of water that can be obtained by melting snow while accumulation is the depth of newly fallen snow over a season that can differ in density and, therefore, doesn't always have the same water content.

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Apr 27

4/27/25 9:40am Update:
Another 4.3" (11 cm) of #snow over the last day brings our season total to 362.99" (922 cm), ~3" (7 cm) over our median annual snowfall of 360" (915 cm).

We had 100% of April 1 median for SWE and are now above average for accumulation too! 1/2

#CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Apr 26

#Snow started shortly after midnight and we have accumulated 4.5" (11.5 cm) so far with light to moderate rates.

We expect more snow through tomorrow with the heaviest rates being overnight tonight and another 5-10" at the lab.

#CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Apr 25

Mwah hahahaha! You thought it was spring but the weather has other plans! ❄️❄️❄️

We are expecting some late-season snow this weekend (April 26 & 27, 2025) above 6000 feet, most of which will fall Saturday night into Sunday morning. We're currently expecting 6-12" at the lab.

#CAwx #CAwater

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UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · Apr 23

We're exciting to be participating in the Tahoe Truckee Earth Day Festival this Saturday April 26, 2025 at the Palisade's Tahoe Village!

Come out to chat with us about all things snow, our research, and educational programs. Or, just stop by to grab yourself a CSSL sticker!

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