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Welcome! California ObservationsAtmospheric River Analyses and Forecasts
The purpose of this website is to take advantage of "web mapping services", GIS-based coding/thinking, and interactive technologies in order to provide dynamic weather analysis and forecast graphics in support of the CW3E mission. Please explore the pages on this website that provide weather analysis and forecast data on a range of spatial and geographic scales from National and West-Coast overviews to watershed-based and atmospheric river-related products.

The development of this webpage is supported by the California Department of Water Resources. The page was developed by CW3E collaborator Dr. Jason Cordeira and CW3E Director Dr. Marty Ralph, with input from CW3E Research Associates Brian Kawzenuk and Chad Hecht.



Watershed Precipitation ForecastsWatershed Freezing Level ForecastsSubseasonal to Seasonal Forecasts




Note: The linked websites on this webpage are optimized for viewing on screen/device sizes that are at least 1150 pixels in width and 650 pixels in height. An alert will appear if the website detects sub-optimal screen/device resolution. While operational, we consider these webpages experimental and encourage feedback; Please contact the website creator or the CW3E webmaster with any questions for feedback you may have.