SPECIAL WEATHER STATEMENT
Issue Date: 236 AM PST FRI DEC 4 2009
Expiration: 400 PM PST FRI DEC 04 2009
...POTENTIAL FOR WINTER STORMS AND COLD TO INCREASE NEXT WEEK...
THE JET STREAM OVER THE PACIFIC IS EXPECTED TO STRENGTHEN NEXT
WEEK LEADING TO AN INCREASE OF SUBTROPICAL MOISTURE INTO THE
REGION. THIS IS EXPECTED TO BRING WINTER STORM SYSTEMS INTO
CALIFORNIA AND NEVADA. THE EXACT TIMING AND STRENGTH OF THE STORMS
REMAIN UNCERTAIN HOWEVER CURRENT THINKING IS THAT TWO SEPARATE
SYSTEMS WILL AFFECT THE REGION NEXT WEEK.
THE FIRST WOULD BE ASSOCIATED WITH A STRONG COLD FRONT EARLY IN
THE WEEK...MAINLY LATE SUNDAY NIGHT AND MONDAY. A PERIOD OF SNOW
IS LIKELY FOR THE SIERRA AND WESTERN NEVADA. SNOW LEVELS WITH THIS
SYSTEM WILL BE AT VALLEY FLOORS COUPLED WITH VERY COLD AIR.
TEMPERATURES WILL LIKELY FALL INTO THE SINGLE DIGITS MONDAY NIGHT
WITH HIGHS STRUGGLING TO REACH 30 MONDAY AND TUESDAY.
A SECOND...WARMER STORM IS POSSIBLE LATER IN THE WEEK...WEDNESDAY
INTO FRIDAY. SNOW LEVELS AND PRECIPITATION AMOUNTS WOULD BE
HIGHER WITH THIS STORM. WITH BOTH SYSTEMS...WINDS WILL INCREASE
AND BECOME STRONG ESPECIALLY ON THE SIERRA RIDGES.
TO SUMMARIZE...UNCERTAINTY IN THE DETAILS REMAINS HIGH AND IT IS TOO
SOON TO ESTIMATE POTENTIAL RAIN OR SNOW AMOUNTS. THE TIMING AND
TRACK OF THESE SYSTEMS MAY CHANGE AS NEW DATA ARE ANALYZED BY
NATIONAL WEATHER SERVICE METEOROLOGISTS. LOCAL OFFICIALS...
EMERGENCY MANAGERS AND ANYONE WITH TRAVEL PLANS NEXT WEEK SHOULD
CONTINUE TO MONITOR THE FORECASTS AND FURTHER STATEMENTS.
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