National Weather Service United States Department of Commerce

Tracking Atmospheric River in the Northwest U.S. and Clipper with Winter Weather in the Northeast U.S.

A prolonged atmospheric river will continue to bring gusty winds, heavy rainfall which may lead to urban and river flooding with possible landslides, and heavy inter-mountain snow over the Pacific Northwest into the northern Rockies through Thursday. A clipper will cross the Great Lakes and Northeast U.S. into Thursday with areas of moderate to heavy snow and mixed wintry precipitation. Read More >

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Important Disclaimer

The following graphics are experimental and not an official forecast product. The graphics were created to display the average recurrence interval (ARI) for 1-hour and 3-hour RFC best-estimate rainfall as well as diagnostics for the MRMS radar-only rainfall estimate product. The plots were developed as a tool for assessing the severity of shorter duration rainfall in realtime as well as biases in radar-only products. A particular ARI value does not necessarily correlate with impacts at a given location.


Experimental products may not always update in a timely manner and may be discontinued at a future date. Experimental products may not always reflect accurate, quality controlled information and should be used with caution.

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