A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >
Eastern Region Headquarters
Regional Headquarters
"How to Interpret the Hydrologic Ensemble Forecast Service (HEFS) Short-Term Probabilistic Guidance" training materials at COMET (free registration required)
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Map Legend
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Chance of Exceedance
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River Forecast Centers
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30%
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Level
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70%
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Action
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Minor Flood
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Moderate Flood
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Major Flood
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 = less than 30% chance of reaching Action level |
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 = no critical levels defined for this point |
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US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Eastern Region Headquarters
630 Johnson Ave., Ste. 202
Bohemia, NY 11716
631-244-0100
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