Sunday, January 15, 2017

Next wet pattern to arrive by Wednesday, stay awhile

From the National Weather Service:
Dry weather with patchy dense Valley fog will continue through Tuesday. River and stream levels are still elevated, but are gradually receding. Confidence is increasing that another extended wet pattern will impact Northern California starting Wednesday. The precipitation and snow graphics on this email focus on the first storm system which arrives by early Wednesday with widespread precipitation and some gusty winds through Thursday. Snow levels will start above pass levels Wednesday morning but lower towards the foothills on Thursday. A second wave of precipitation will swing through interior NorCal on Friday with lingering showers into Saturday as snow levels lower further. Models suggest that the wet pattern could continue into early next week with a third wave arriving Sunday into Monday. It's important to take advantage of the upcoming dry days to assess storm damage from our previous week and continue inspections on levees before we return to another extended wet pattern.

Renewed flooding concerns
Downed trees and power lines due to saturated soil and gusty winds
Mountain travel hazards from snow (chain controls, delays, accidents)
Reduced visibility from morning Valley fog

Forecast Confidence
High on return to wet pattern
Medium on timing, amounts, snow levels

Timing and Strength
Dry weather through Tuesday with patchy morning Valley fog
River and streams levels are still elevated, will continue to gradually recede
Take advantage of dry days to assess storm damage, prepare for next storm
First System Wednesday - Thursday
Heaviest Wednesday afternoon into early Thursday morning
Snow levels:
Wednesday morning - above 7000 feet
Wednesday evening - lowering below pass levels around 5000-6000 feet
Thursday - lowering to 3500-4000 feet
Breezy to locally gusty winds
Second System Friday with lingering showers on Saturday
Heaviest precipitation on Friday
Snow levels ~3000 feet on Friday, lowering to 1500-2000 feet by Saturday morning
Breezy to locally gusty winds
Third System possible on Sunday-Monday
For updates, check here and at

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