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Thursday, February 12, 2009

More Snow Coming...

Issued by The National Weather Service
Sacramento, CA
4:37 pm PST, Thu., Feb. 12, 2009

... POWERFUL STORM MAY IMPACT NORTHERN CALIFORNIA OVER THE PRESIDENTS DAY HOLIDAY WEEKEND...

ANOTHER COLD LOW PRESSURE SYSTEM WILL SPREAD RAIN AND SNOW ACROSS THE REGION TONIGHT AND FRIDAY. THIS SYSTEM WILL CAUSE TYPICAL WINTER CONDITIONS OVER MOUNTAIN PASSES. WINTER WEATHER ADVISORIES ARE IN EFFECT FOR THE MOUNTAINS. SNOW LEVELS AS LOW AS 1500 FEET HAVE ALSO PROMPTED THE ISSUANCE OF WINTER WEATHER ADVISORIES FOR THE FOOTHILLS AND MOTHERLODE. THIS SYSTEM COULD DROP A HALF INCH OF RAIN IN THE VALLEYS WITH LOCALLY HIGHER AMOUNTS IN THE NORTHERN SACRAMENTO VALLEY BY FRIDAY AFTERNOON.

A MUCH STRONGER STORM MAY BRING HAZARDOUS WEATHER TO THE ENTIRE REGION SATURDAY AND SUNDAY. THE LATEST COMPUTER MODELS SHOW A DEEP CYCLONE JUST OFF THE NORTHERN CALIFORNIA COAST SATURDAY NIGHT THAT WILL BE VERY SLOW TO MOVE INLAND. A STEADY STREAM OF MOISTURE WILL SURGE ACROSS NORTHERN CALIFORNIA LATE SATURDAY AND SUNDAY. HEAVY RAIN IS POSSIBLE IN THE VALLEYS AND FOOTHILLS... WITH HEAVY SNOW IN THE MOUNTAINS DURING THIS PERIOD.

THIS WILL BE A WINDY STORM. SOUTHEAST WIND GUSTS UP TO 50 MPH ARE POSSIBLE IN THE VALLEYS AND FOOTHILLS SATURDAY NIGHT. HEAVY RAIN MAY CAUSE MUD SLIDE AND DEBRIS FLOW PROBLEMS OVER BURN SCARS FROM SUMMER WILDFIRES. URBAN AND SMALL STREAM NUISANCE TYPE FLOODING IS ALSO POSSIBLE. THUNDERSTORMS COULD DEVELOP IN VERY UNSTABLE AIR SUNDAY. IN THE MOUNTAINS... SEVERAL FEET OF SNOW MAY COMBINE WITH WIND GUSTS IN EXCESS OF 70 MPH TO FORCE THE CLOSURE OF MAJOR HIGHWAYS SUCH AS INTERSTATE 80 AND HIGHWAY 50. WINTER STORM WATCHES HAVE ALREADY BEEN ISSUED BECAUSE OF THE POTENTIAL HIGH IMPACT OF THIS STORM.

SNOW LEVELS MAY ALSO BE A LITTLE HIGHER WITH THIS STORM. THIS COULD CAUSE THE SNOW PACK AT ELEVATIONS BELOW 3000 FEET TO RAPIDLY WASH AWAY AND AGGRAVATE MORE NUISANCE TYPE FLOODING.

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