Atmospheric River Portal Access information, images, analyses, diagnostics of current conditions, forecasts, and projects related to atmospheric rivers (ARs). More on ARs...

The graphics below are designed to forecast the presence and strength of Atmospheric Rivers using data from the NCEP Global Forecast System (GFS), North American Mesoscale Forecast System (NAM), and Global Ensemble Forecast System (GEFS) models.

This page contains 1, 3, 5, and 7-day Quantitative Precipitation Forecasts (QPF). The products are produced by Dr. Jason Cordeira of Plymouth State University as a cooperative effort with CW3E using the NOAA/NCEP Weather Prediction Center (WPC) and the NOAA/NCEP Global Forecast System (GFS) Model. The WPC QPF data are plotted on a ~5 km grid and the 0.25° …

Atmospheric Rivers (ARs) are relatively narrow regions in the atmosphere and are responsible for most of the horizontal transport of water vapor outside of the tropics.

The following shows the Automated Atmospheric River detection technique designed and run by NOAA/ESRL/PSL applied to SSMIS water vapor imagery. [ More Information and Archived …

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Atmospheric Rivers (ARs) are the regions of extratropical storms where high winds and water vapor are concentrated. These factors combine to produce heavy rainfall upon landfall, especially over mountainous terrain.

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Atmospheric Rivers (ARs) are narrow belts of concentrated moisture transported in the atmosphere, and are a key process linking weather and climate. ARs provide beneficial water supply and snowpack.

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