CW3E Publication Notice: "The Role of an Atmospheric River in Amplifying the June 2021 Western North American Heat Wave" in the @ametsoc.org Monthly Weather Review. Read more about this study here: cw3e.ucsd.edu/cw3e-publica...

CW3E Publication Notice: "Atmospheric Rivers are a Frequent Source of Moisture Transport in Severe Convective Storm Environments" was recently published in the @agu.org's Geophysical Research Letters. Read more about this research here: cw3e.ucsd.edu/cw3e-publica...

New AQPI C-Band Radar Delivers Impressive Results for Late-Season Storm that Impacted the Bay Area between 11-12 Apr 2026. Read more about the benefit of these improved observations here: cw3e.ucsd.edu/new-aqpi-c-b...

CW3E Adds New Radiosonde Launch Site at Grays Harbor College in Aberdeen, WA

56 #AtmosphericRivers made landfall along the U.S. West Coast during the first 6 months of Water Year 2026. There were stark differences in AR activity between October-December (14 strong or greater ARs) and January-March (3 strong ARs). Read the full summary here: cw3e.ucsd.edu/the-atmosphe....

CW3E Publication Notice: "A Climatological and Keyword-Based Analysis of National Weather Service Mesoscale Precipitation Discussions" was recently published in the @nwas.org Journal of Operational Meteorology. Read more about this research here: cw3e.ucsd.edu/cw3e-publica...

A late-season storm brought low-elevation rain and heavy mountain snow to northern and central California last weekend. See our latest Quick Summary for more details: cw3e.ucsd.edu/wp-content/u....

CW3E Publication Notice: "Tibetan Plateau Mountain Wave Simulation Using AI-Driven 3D Adaptive Mesh Refinement" in @agu.org's Journal of Geophysical Research: Atmospheres. For a summary of this paper, visit cw3e.ucsd.edu/cw3e-publica....

CW3E Publication Notice: "Interior Antarctica is undergoing marked climate change" in @nature.com's Communications Earth & Environment. For a summary of this paper, visit cw3e.ucsd.edu/cw3e-publica....

CW3E Publication Notice: "Föhn-Induced Melting over Larsen C Modulated by Atmospheric River Shape, Direction, and Landfall Location" in @nature.com's Nature Communications. For a summary of this paper, visit: cw3e.ucsd.edu/cw3e-publica....

A cutoff low and shortwave trough are forecast to bring rain and potential snowfall along with cooler temperatures to California between Friday 10 April and Monday 13 April. See our latest quick look for more details: cw3e.ucsd.edu/wp-content/u...

CW3E has prepared an event summary detailing the series of named storms and #AtmosphericRivers that fueled well above normal precipitation to the Iberian Peninsula between January and February, 2026. Read our analysis here: cw3e.ucsd.edu/cw3e-event-s...

CW3E Works With Partners to Make Advanced Quantitative Precipitation Information (AQPI) System Fully Operational. Read the full @noaa.gov Press Release here: research.noaa.gov/groundbreaki...

Check out our latest Quick Look at the pattern shift forecast to occur next week over the Western US, with the potential for cooler and wetter conditions. Read more here: cw3e.ucsd.edu/wp-content/u...

CW3E Director Marty Ralph will present a seminar at the Earth System Science Interdisciplinary Center at the University of Maryland on Monday, March 30 titled “Atmospheric Rivers: From Science to Solutions.” To attend this seminar in person or virtually, visit: essic.umd.edu/events/marty...

A long-duration #AtmosphericRiver produced moderate-to-heavy rainfall and flooding in portions of Washington last week. See our latest Quick Summary for more details: cw3e.ucsd.edu/wp-content/u....

Unseasonably warm and dry conditions will persist over much of the southwestern US into next week, while another #AtmosphericRiver is forecast to impact the Pacific Northwest. See our latest Quick Look for more details: cw3e.ucsd.edu/wp-content/u....

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....