Tuesday, January 3, 2017

Big rains this week to continue winter of recovery

From the National Weather Service:
A warmer weather system will impact Northern California mid week with mountain snow, valley rain, and windy conditions. The brunt of the precipitation falls this afternoon through Wednesday with lingering showers south of Interstate 80 over the Sierra into early Thursday.

Increasing confidence of an atmospheric river impacting interior northern California over the weekend and into Monday. The west-southwest flow will likely generate significant rain amounts with good upslope flow over the Sierra. This rain added to the already wet to nearly saturated ground may generate stream and small river flooding concerns this weekend into Monday.

Impacts
Today into Thursday - Hazardous winter travel including mid slope elevations: decreased visibilities, travel delays and chain controls continue
Weekend into Monday - Potential street, stream, and river flooding

Forecast Confidence
High Today into Thursday
Medium Saturday into Monday

Timing and Strength
Today - Early Thursday: Rain, Snow & Wind
Shasta/Tehama/Plumas Counties: Heaviest snow above 2000 ft
Western Sierra: Heaviest snow above 4000 ft (north) to 5000 ft (south) with a dusting to a few of inches possible in upper foothills (3000 ft)
Strong winds much of Valley and Sierra foothills this evening and tonight
Brief break in precipitation Thursday PM - Friday
Weekend - Monday: Atmospheric River Rain

Increasing confidence of significant period of rain with increasing snow levels (6500 to 7500 ft)
Valley - 1 to 3 inches of rain
Foothills/mountains - 4 to 10 inches of rain
The abundance of rain and snow continues an impressive winter and comes as state officials are set today to do their first manual snow survey of the season. For results of that, keep watch here and at CapitalPress.com.

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