A long-duration #AtmosphericRiver will continue to impact the Pacific Northwest through early Saturday, with flooding expected in western Washington. Check out our latest Quick Look for additional information or visit: cw3e.ucsd.edu/wp-content/u...

CW3E Publication Notice: "Evaluation of GFSv16 for Near-Real-Time Data Impact Studies During the Atmospheric River Reconnaissance Program 2022" in the @agu.org Journal of Geophysical Research: Atmospheres. To read a summary of this article, visit: cw3e.ucsd.edu/cw3e-publica...

A long-duration #AtmosphericRiver will bring moderate-to-heavy rainfall to portions of western Washington this week. Riverine flooding is possible due to the combination of snowmelt and rain at higher elevations. See our latest AR Outlook for more information: cw3e.ucsd.edu/cw3e-ar-upda....

Ensemble guidance is showing high confidence in a prolonged period of #AtmosphericRiver conditions over the PNW beginning this weekend and continuing through next week, with potential for heavy rain in WA from this event. See our latest AR outlook for more details: cw3e.ucsd.edu/cw3e-ar-upda...

A long-duration #AtmosphericRiver is forecast to bring heavy rain and snow to portions of the Pacific Northwest this week with additional AR activity possible next week. See our latest Quick Look for more information: cw3e.ucsd.edu/wp-content/u...

Multiple #AtmosphericRivers are forecast to bring heavy rain and snow to the Pacific Northwest this week into early next week. See our latest AR Outlook for more details: cw3e.ucsd.edu/cw3e-ar-upda....

CW3E Publication Notice: "HyMeshAI: Deep learning enabled three-dimensional adaptive mesh generator for high-resolution atmospheric simulations" was recently published in the Journal of Computational Physics. Read more about this research here: cw3e.ucsd.edu/cw3e-publica...

CW3E Publication Notice: "Adaptive Sampling of the Upper Ocean by Autonomous Floats During Atmospheric River Precipitation" in @agu.org's Geophysical Research Letters. Visit our website to read more about this research: cw3e.ucsd.edu/cw3e-publica...

CW3E Publication Notice: "Comparing the Robustness of Forecast-Informed Reservoir Operating Policies under Forecast Uncertainty and Hydrologic Extremes" in the Journal of Water Resources Planning and Management. Read more about this research on our website here: cw3e.ucsd.edu/cw3e-publica...

CW3E Publication Notice: "Emerging trends in landfalling atmospheric rivers over the South Pacific" was recently published in npj Climate and Atmospheric Science. Visit our website to read more about this research: cw3e.ucsd.edu/cw3e-publica...

CW3E Publication Notice: "Antarctica’s uncertain future: sea-level rise from oceanic and atmospheric forcing, with a focus on atmospheric rivers" in Frontiers in Earth Science. To read more about this research visit: cw3e.ucsd.edu/cw3e-publica...

CW3E Publication Notice: Several papers investigating the impacts of #AtmosphericRivers on cloud radiative effects in both the Arctic and Antarctic have recently been published. Read more about these publications here: cw3e.ucsd.edu/cw3e-publica...

CW3E Publication Notice: "Antecedent moisture enhances early warning of atmospheric river flood hazards" in Nature Communications. Read more about this research here: cw3e.ucsd.edu/cw3e-publica...

A low pressure system and an #AtmosphericRiver brought heavy precipitation to western Oregon and Northern California and snow over the Cascades and Bitterroot Ranges. See our latest Quick Summary for more information: cw3e.ucsd.edu/wp-content/u....

🌎 1️⃣ 6️⃣ teams represented by students from universities across North America are teaming up to collect observations to improve global #AtmosphericRiver forecasts. Learn more about the initiative led by @cw3escripps.bsky.social#AtmosphericRiver ⤵️

Multiple winter storms brought heavy rain and snow to California last week. Portions of the Sierra Nevada received more than 6 feet of total snow. See our latest Quick Summary for more information: cw3e.ucsd.edu/wp-content/u....

A strong #AtmosphericRiver fueled by tropical and subtropical moisture will bring heavy rain to portions of the Pacific Northwest and California today and tomorrow. See our latest Quick Look for more information: cw3e.ucsd.edu/wp-content/u....

CW3E AR Update: Confidence has increased in a long duration #AtmosphericRiver event associated with a slow-moving low-pressure system, forecast to bring heavy precip to the U.S. West Coast between Sat 21 and Wed 25 Feb. See our latest outlook for more information: cw3e.ucsd.edu/cw3e-ar-upda...

CW3E AR Update: #AtmosphericRiver conditions associated with a slow-moving low-pressure system are forecast to bring precipitation to the U.S. West Coast between Sat 21 and Thu 26 Feb. See our latest outlook for more information: cw3e.ucsd.edu/cw3e-ar-upda....

CW3E Publication Notice: "Image-based classification of stream stage to support ephemeral stream monitoring" in @egu.eu's Hydrology and Earth System Sciences. For a summary of this paper, visit: cw3e.ucsd.edu/cw3e-publica....

Multiple winter storms and a weak #AtmosphericRiver will bring additional rain and heavy snow to California this week. There is potential for another impactful AR this weekend into early next week. See our latest Quick Look for more information: cw3e.ucsd.edu/wp-content/u....

The 2026 International Atmospheric River Conference (𝗜𝗔𝗥𝗖𝟮𝟬𝟮𝟲) is coming to Porto, Portugal! 📅 19–23 October 2026 | 📍 Alfândega Congress Centre + virtual option Join the conversation on atmospheric rivers and their impact on water, weather extremes, and climate resilience.

CW3E Publication Notice: "Deterministic nowcasting of geostationary satellite infrared brightness temperature using a 3D U-Net diffusion model" in @nature.com's Scientific Reports. For a summary of this paper, visit: cw3e.ucsd.edu/cw3e-publica....

CW3E Publication Notice: "Enhancing Deterministic Freezing-Level Predictions in the Northern Sierra Nevada through Deep Neural Networks" in @ametsoc.org's Journal of Hydrometeorology. For a summary of this paper, visit: cw3e.ucsd.edu/cw3e-publica....

CW3E Publication Notice: "Convection Embedded in an Atmospheric River: Exploring Precipitation Sensitivity to Convective Parameterizations" in @ametsoc.org's Monthly Weather Review. For a summary of this paper, visit: cw3e.ucsd.edu/cw3e-publica....

CW3E Winter Storm Update: Multiple winter storms are forecast to bring rain and heavy snow to California late this weekend into much of next week. See our latest outlook for more information: cw3e.ucsd.edu/cw3e-winter-....

CW3E AR Update: There is an indication for a pair of mid-level troughs and surface low pressure systems are forecast to bring precipitation to much of California beginning this weekend and continuing through the end of next week. Read the full Quick Look here: cw3e.ucsd.edu/wp-content/u...

CW3E is hiring a Project Scientist to join our team and work on topics related to subseasonal-and-seasonal (S&S) prediction! We are seeking a well-rounded hydroclimate scientist able to contribute to and evolve several projects. Read the job posting and apply here: apol-recruit.ucsd.edu/JPF04422

CW3E AR Update: Here is a quick look at the weak atmospheric river forecast to move over California on Tuesday and bring primarily beneficial rain and snow to the state through mid-week. Read the full Quick Look here: cw3e.ucsd.edu/wp-content/u...

CW3E AR Update: An #AtmosphericRiver is forecast to bring moderate precipitation to the Pacific Northwest this weekend into early next week. See our latest Quick Look for more information: cw3e.ucsd.edu/wp-content/u...

The forecast for Super Bowl Sunday near Levi's Stadium is mostly dry and warm, with a slight chance of light rain in the evening. Normally, December, January and February are the three wettest months of the year in northern California, but it has been unusually dry since early January.

A family of #AtmosphericRivers brought moderate-to-heavy precipitation to portions of Washington last week. See our latest Quick Summary for more information: cw3e.ucsd.edu/wp-content/u....

CW3E AR Update: Multiple #AtmosphericRivers are forecast to bring heavy precipitation to portions of the Pacific Northwest this week. See our latest Quick Look for more information: cw3e.ucsd.edu/wp-content/u....

CW3E has prepared a detailed event summary discussing the multiple #AtmosphericRivers that produced heavy precipitation, significant snowfall, and widespread impacts over the US West Coast between 18–27 Dec 2025. Read our extensive analysis here: cw3e.ucsd.edu/cw3e-event-s...

We posted a quick summary of the #AtmosphericRivers that influenced precipitation across the US West Coast and led to heavy precipitation in CA this past week. Check out more here: cw3e.ucsd.edu/wp-content/u...

Multiple systems are forecast to bring low-elevation rain and heavy mountain snow to the Pacific Northwest this week. See our latest Quick Look for more information: cw3e.ucsd.edu/wp-content/u....

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...