Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

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 >

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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 Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

GJT Significant Weather Report Info