Tuesday, January 31, 2017

NWS: Next winter storm to arrive tomorrow night


From the National Weather Service:
A storm system this week will bring rain and mountain snow to northern California. Scattered light precipitation will start Wednesday evening across the Coastal and southern Cascade mountains and become more widespread across the area after midnight. Heavier precipitation amounts are expected midday Thursday through Friday with scattered rain and snow showers remaining Saturday as the system exits the region. Storm total snow could reach 2 to 3 feet at pass levels, causing travel difficulties. Gusty winds are probable Thursday into Friday, strongest Thursday afternoon and again later Friday morning. These winds are not expected to be as strong as with recent storms.

Impacts
Hazardous mountain travel likely with chain controls, travel delays, and increased accidents
Wet valley roads with possible travel delays and increased accidents
Gusty winds may cause travel difficulties and bring down tree branches
Minor flooding on small streams and roadways

Forecast Confidence
High on return to wet pattern
Medium on timing, precipitation amounts, snow levels
Medium on small stream and street flooding

Timing and Strength
System spreads inland Wednesday evening and continues through Friday night
Light precipitation starting Wednesday evening; becoming widespread by early Thursday morning with heavier amounts midday Thursday
Total snow accumulations around 1-3 feet above 6000 feet, snow levels a little lower at times
Winds gusting up to around 40 mph in the Valley, 50 mph in the Sierra

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