Heavy Rain and Flash Flooding Concerns in California; Heavy Snow in the Sierra

An atmospheric river will bring heavy rainfall to lower elevations of California this week, and heavy snow to the Sierra Nevada mountains. Flash flooding, some of which may be locally considerable, will be a concern on the western foothills of the Sierra Nevada mountains through Tuesday. Landslides, rockfalls and mudslides are possible in the Southern California mountains. Read More >

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Significant Weather Phenomena to Report to the National Weather Service

Large thunder storm over city at sunset

Tornado, Funnel Cloud, or Wall Cloud
Hail of any size
Wind gusts greater than 40 mph
Heavy rain and/or high rainfall rates
Flash Flooding
Street, parking lot, or underpass flooding
Weather-related damage of any kind
Unusual or questionable weather
Heavy snow or high snowfall rates
Dense Fog or Smoke (visibilities less than 1/2 mile)

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Heavy Rain and Flash Flooding Concerns in California; Heavy Snow in the Sierra

GJT Significant Weather Report Info