Thursday, November 29, 2012

Severe Weather Alert: Coastal River Flooding Likely This Weekend


 Periods of rain will move across the region through Sunday night. Central California will receive between 2 and 6 inches of rainfall while less than an inch of rainfall is expected over Southern California. There will be south to west winds of 15 to 30 mph across Central California through Sunday afternoon
WEATHER DISCUSSION: 
***Heavy rain over Central California through the weekend. Windy in the northern deserts***

 A deep low pressure area coupled with a moisture-laden jet stream will lead to heavy rainfall over the central part of the state during the next few days. The bulk of the precipitation looks to occur on Friday and again Sunday, with light showers, or drizzle, occurring between these two
main frontal passages. Today, expect intermittent light rain and drizzle before the next band of moderate to heavy rain moves into Central California Friday. 

FLOOD WATCH
Flooding: Rivers in Northern California and Southern Oregon are expected to flood in the next few days, the National Weather Service predicts.

No rivers were at flood stage as of Thursday, but the current storm will last for several days, drenching the area with heavy rain and high winds.

Moderate flooding is expected by Sunday on California's Sacramento River above Bend Bridge and at Red Bluff Diversion Dam. Rainfall totals of 5 to 10 inches are possible through the weekend, and river levels throughout the region will likely remain high through Monday. 

In Oregon, the Coquille River near Coquille will rise about a foot above flood stage Saturday and remain there at least through Monday. Other streams and rivers in Southwest Oregon will also rise and possibly flood.

Debris flows: Possible, especially near areas burned in recent wildfires.

Temperatures: will remain cool today and throughout the weekend with highs in the 60s at lower elevations. 

Winds: It will turn very windy across the Owens Valley, Mono County and the Inyo N.F. where some south and southwest winds of 30-40 mph with gusts over 70 mph will be possible tonight and Friday and again Saturday night through Sunday. 

Rains:  In all, the heaviest rain will occur along the central coast and the Sierra Foothills where up to 6 inches of rainfall will be possible through Monday morning. Across Southern California,
precipitation amounts will be much lighter – up to an inch and a half will be possible along the south slopes of Santa Barbara and Ventura Counties and the southern end of the Angeles N.F. A half inch may occur in Orange County and the San Bernardino N.F. with up to a quarter
of an inch in the Cleveland N.F. 
The precipitation will taper off in all but the far southern part of the state by Monday morning.

Snow:  The snow level will be very high throughout the storm with snowfall occurring at 7,500 feet in Yosemite N.P. to over 8,500 feet in the southern Sierras. The snowfall should remain above resort level in Southern California.  

Forecast: A drying and warming trend is expected Tuesday and Wednesday with highs
climbing back to near to slightly above normal readings. The tail end of a Pacific N.W. system may bring additional rain to Central California Thursday and cooler weather elsewhere. 

Offshore flow may occur during the weekend of December 8th -10thNo significant fire weather expected.

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