Check out our latest AR Quick Look discussing the #AtmosphericRiver forecast to make landfall later today and bring precipitation impacts to California into early next week. Read more here: cw3e.ucsd.edu/wp-content/u...

A pair of #AtmosphericRivers and a low-pressure system drive precipitation across California over the next week, including potentially significant snowfall over the Sierra Nevada during the second AR. See the latest AR outlook for further details: cw3e.ucsd.edu/cw3e-ar-upda...

CW3E Publication Notice: "Compound Atmospheric Drivers of the Catastrophic 2025 Los Angeles Urban Firestorm" in @nature.com's npj Natural Hazards. For a summary of this paper, visit: cw3e.ucsd.edu/cw3e-publica....

Multiple storms are forecast to bring moderate-to-heavy precipitation to California later this week. See our latest Quick Look for more information: cw3e.ucsd.edu/wp-content/u....

A pair of #AtmosphericRivers are forecast to bring heavy precipitation and snowfall to California with the risk for flooding in southern California in the next five days. See more here: cw3e.ucsd.edu/wp-content/u...

CW3E has prepared a detailed summary of the long-duration #AtmosphericRiver that produced extreme precipitation and caused record-breaking flooding in Washington earlier this month. cw3e.ucsd.edu/cw3e-event-s...

Multiple #AtmosphericRivers and low-pressure systems will bring heavy precipitation to much of California this week. A high risk of excessive rainfall has been issued for the Transverse Ranges Wed into early Thu. See our latest AR outlook for more details: cw3e.ucsd.edu/cw3e-ar-upda....

An active weather pattern is forecast to set up with multiple #atmosphericrivers over California this weekend into next week. Significant rainfall totals are forecast over the region, with flooding possible. Read our latest update here: go.ucsd.edu/4sbMCKE & Pay attention to @nws.noaa.gov forecasts.

Press Release: "Atmospheric River Research Flights Go Global" Read the latest @scrippsocean.bsky.social news article to learn about the expansion of #AtmosphericRiver Reconnaissance flights across the Pacific and Atlantic basins here: scripps.ucsd.edu/news/atmosph....

An #AtmosphericRiver is forecast to move over the Pacific Northwest on Thu., bringing additional rainfall to WA, OR, and Northern CA as it shifts down the coast thru Fri. A second AR will follow behind on Sat. with additional impacts forecast over Northern CA thru Mon. Read more: go.ucsd.edu/451WXPa

CW3E AR Update: AR activity is forecast to continue over the PNW thru early Wed., with a 2nd AR forecast to move onshore late on Wed. over the PNW and N. CA, through Fri. Models are also highlighting the potential for AR activity over CA next week. Read more here: cw3e.ucsd.edu/cw3e-ar-upda...

🏅Congratulations to the 3️⃣ scientists at Scripps Oceanography who will be honored by @agu.org at this week's AGU Annual Meeting through its Honors and Recognition program, which acknowledges section awardees, named lecturers & elected fellows! Learn more: scripps.ucsd.edu/news/three-s...

CW3E Publication Notice: "The NCEI Historical Data Record for Atmospheric Rivers: Visualization over the Western United States" in the @ametsoc.org Bulletin of the American Meteorological Society. Read more here: cw3e.ucsd.edu/cw3e-publica...

Another strong #atmosphericriver is forecast to move onshore over British Columbia & the Pacific Northwest on Sun 14 Dec, shifting southward along the US West Coast and into N. California during the beginning of next week. Read more here in our latest AR Outlook: cw3e.ucsd.edu/cw3e-ar-upda...

CW3E Publication Notice: "Insights from a 25-year Database of Post-Fire Debris Flows in California" published in the International Journal of Wildland Fire with collaborators @cageosurvey.bsky.social Read more about this research here: cw3e.ucsd.edu/cw3e-publica...

🌧️ How do we study #AtmosphericRivers? 🛫 By flying planes into them, obviously! @cw3escripps.bsky.social's Alex Tardy caught up with Fox Weather to share why flights are critical for understanding ARs ahead of a powerful atmospheric river headed for the Northwest. U.S. ⬇️

The atmospheric river (AR) presently impacting the Pacific Northwest will continue to produce very heavy precipitation in western Washington today into early tomorrow, leading to potentially historic riverine flooding. Read more here: cw3e.ucsd.edu/wp-content/u...

We posted a quick summary of the #AtmosphericRiver the brought precipitation to the Pacific Northwest on Dec 3-6 ahead of the system presently impacting the region. Read more here: cw3e.ucsd.edu/wp-content/u...

A strong and long-duration #AtmosphericRiver, potentially ranking as an AR 5 in coastal Washington, will produce heavy rainfall and flooding in the Pacific Northwest this week. #WAwx #ORwx See our latest AR Outlook for more information: cw3e.ucsd.edu/cw3e-ar-upda....

After today’s AR dissipates over the Pacific Northwest, a stronger AR is forecast to move onshore Mon 8 Dec and remain over the region until early Thu 11 Dec. This long-duration AR is expected to result in multiple days of heavy rainfall leading to significant streamflow impacts over the region.

A trio of #AtmosphericRivers are forecast to make landfall over the Pacific Northwest in the next week, leading to heavy precipitation, snowfall at high elevations and stream rises and potential flooding. Check out the latest outlook discussing the sequence of events: cw3e.ucsd.edu/cw3e-ar-upda...

CW3E Publication Notice: "Lightning Characteristics of Atmospheric Rivers over the Americas Observed by GOES-16" in @agu.org's Geophysical Research Letters. For a summary of this paper, visit: cw3e.ucsd.edu/cw3e-publica....

We've posted a quick summary of the two storm systems that resulted in multi-day precipitation events over the Southwestern US between 16-19 Nov & 20-23 Nov. Read more here: cw3e.ucsd.edu/wp-content/u...

CW3E AR Update: Multiple weak #AtmosphericRivers and a low-pressure system are forecast to bring precipitation to the Pacific Northwest this week. See our latest Quick Look for more information: cw3e.ucsd.edu/wp-content/u....

We've posted a quick summary of the strong #AtmosphericRiver that produced heavy rainfall, flash flooding, and landslides across California last week. Stay tuned for a more detailed summary that will examine forecast challenges associated with this event. cw3e.ucsd.edu/wp-content/u...

CW3E Publication Notice: "Subseasonal-to-Seasonal Prediction: The Gap Between Weather and Climate Forecasting (2nd Edition)." Read more about this book, including a subsection on Subseasonal and Seasonal predictability of atmospheric rivers led by CW3E Researchers: cw3e.ucsd.edu/cw3e-publica...

A cutoff low and #AtmosphericRiver drive two separate precipitation events forecast to impact the US West Coast through this Mon 24 Nov. Read the latest quick look for more details: cw3e.ucsd.edu/wp-content/u...

The #AtmosphericRiver that drove heavy precipitation across CA is forecast to bring heavy precipitation and potential flash flooding to Southern CA through Sat 15 Nov. Check out the forecast details in our latest AR Quick Look: cw3e.ucsd.edu/wp-content/u...

An impactful #AtmosphericRiver is forecast to make landfall over CA this evening and bring multiple days of heavy precipitation to the state through Sat. Forecasts have trended towards a slower AR, prolonging the event duration & increasing precip. totals. Read more cw3e.ucsd.edu/cw3e-ar-upda...

An #AtmosphericRiver is forecast to bring heavy rain and mountain snow to California this week. The NWS Weather Prediction Center has issued a marginal risk of excessive rainfall for much of coastal California. See our latest AR Outlook for more information: cw3e.ucsd.edu/cw3e-ar-upda....

CW3E AR Update: Model guidance is showing the potential for #AtmosphericRiver activity along the US West Coast and heavy precipitation over California next week. See forecast details here: cw3e.ucsd.edu/wp-content/u...

CW3E Publication Notice: "Improving Streamflow Simulation through Machine Learning-Powered Data Integration and Its Potential for Forecasting in the Western U.S." in the @egu.eu's Hydrology and Earth System Sciences. Read more about this research here: go.ucsd.edu/4qMBt27

CW3E AR Update: A pair of #AtmosphericRivers are forecast to impact the US West Coast the next two days. These AR are forecast to bring precip to the Pacific Northwest and Northern CA and snowfall to the Northern Cascades. See forecast details here: cw3e.ucsd.edu/wp-content/u...

CW3E AR Update: Back-to-back atmospheric rivers are forecast to bring precipitation and coastal impacts to the Pacific Northwest and N. California through this week, with more AR activity this weekend. Read our latest Quick Look here: cw3e.ucsd.edu/wp-content/u...

CW3E AR Update: An active weather pattern will continue this week, with multiple #AtmosphericRivers forecast to bring heavy precipitation to portions of the Pacific Northwest and northern California. See our latest AR Outlook for more details: cw3e.ucsd.edu/cw3e-ar-upda....

CW3E Quick Summary: An atmospheric river (AR) made landfall early Fri 31 Oct, bringing AR3 conditions the Pacific Northwest. The AR produced 5-8" of precipitation over the region during the 48-hour period ending at 5 am PDT Sun 02 Nov. See the Quick Summary for more info: go.ucsd.edu/3WBUx5i

CW3E AR Update: Multiple #AtmosphericRivers are forecast to impact the US West Coast and potentially bring heavy precipitation to portions of Washington, Oregon, and California over the next 7 days. See our latest AR Outlook for more information: cw3e.ucsd.edu/cw3e-ar-upda....

Earlier this month, CW3E met with Colorado partners and stakeholders to celebrate the installation of a new hydrometeorological station at Colorado Mountain College. This is the 7th station in the Yampa Basin Atmosphere and Soil Moisture Integrated Network (Y-BASIN). cw3e.ucsd.edu/ribbon-cutti...

CW3E AR Update: Pair of #AtmosphericRivers , one landfalling today and a second forecast early next week, are forecast to bring precipitation to the Pacific Northwest and Northern California. Check out our latest AR Outlook for more information: cw3e.ucsd.edu/cw3e-ar-upda...

🌧️ Better #AtmosphericRiver forecasts 🤝🏽 smarter water storage Lake Mendocino just became the first U.S. reservoir approved to use forecast-informed operations — a strategy pioneered by @cw3escripps.bsky.social Director Marty Ralph and partners to boost water supply while managing flood risk.

CW3E AR Update: #AtmosphericRivers forecast to bring precipitation to the Pacific Northwest and Northern California later this week. Read more in our latest AR Outlook here: cw3e.ucsd.edu/cw3e-ar-upda...

CW3E AR Update: Multiple #AtmosphericRivers are forecast to impact the US West Coast later this week, with unsettled weather potentially continuing through next week. See our latest AR Outlook for more details: cw3e.ucsd.edu/cw3e-ar-upda....

A strong upper-level trough and associated cutoff low moved southward along the California coast between 13-14 October 2025, bringing heavy rain, mountain snow, and severe weather to portions of Central and Southern California. See our latest Quick Summary for more information: go.ucsd.edu/4qhoTYg

Moisture associated with Tropical Storms Priscilla and Raymond fueled multiple episodes of heavy rainfall over the Colorado River Basin between Thu 9 Oct and Tue 14 Oct. See our latest Quick Summary for more information: cw3e.ucsd.edu/wp-content/u....

CW3E AR Update: A moderate-to-strong atmospheric river is forecast to move onshore over the Pacific Northwest on Saturday, although there is still some uncertainty as to the timing, intensity, and potential impacts to the region. Read more in our latest Quick Look: cw3e.ucsd.edu/wp-content/u...

CW3E AR Update: A cutoff low and an #AtmosphericRiver will bring primarily beneficial early-season precipitation to California and help reduce wildfire risk over southern California. See our latest Quick Look for more information: cw3e.ucsd.edu/wp-content/u....

CW3E Precipitation Update: Multiple Precipitation Events to Impact the Western US Through Early Next Week. Read more in our latest outlook here: cw3e.ucsd.edu/cw3e-precipi...

CW3E Publication Notice: "Comparison of GOES-17 Atmospheric Motion Vectors With AR Recon Dropsonde Data and Assessment of Wind Fields in the Global Forecast System During Atmospheric River Events" in the @agu.org's Journal of Geophysical Research: Atmospheres. Read more here: go.ucsd.edu/3L1zPsQ

A predecessor rain event associated with the moisture from Hurricane Priscilla is forecast to bring rainfall to Arizona and New Mexico Thu-Sat, followed by additional precipitation associated with an upper-level trough, which may continue into early next week. Read more here: go.ucsd.edu/4q0WYM9

CW3E Publication Notice: "Leveraging the Atmospheric River Framework to Categorize Top-Decile Precipitation Regimes in Colorado" in @agu.org 's Geophysical Research Letters. Read more about this research: cw3e.ucsd.edu/cw3e-publica...