856
FXUS01 KWBC 090854
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
454 AM EDT THU OCT 09 2008
VALID 12Z THU OCT 09 2008 - 00Z SAT OCT 11 2008
ACROSS THE WEST... A POTENT UPPER LEVEL TROUGH WILL DIG INTO THE
WEST OVER THE NEXT COUPLE OF DAYS... CENTERING ITSELF OVER NEVADA
BY FRIDAY INTO SATURDAY. BY THE TIME THE WEEKEND ARRIVES...
TEMPERATURES WILL HAVE PLUMMETED TO ABOUT 20 TO 30 DEGREES BELOW
AVERAGE OVER A LARGE PORTION OF THE WEST... WITH THE EXCEPTION OF
NEW MEXICO AND SOUTH CENTRAL COLORADO... AS THESE AREAS WILL BE ON
THE WARN SIDE OF THE TROUGH. IN FACT... MANY AREAS BETWEEN THE
ROCKIES AND APPALACHIANS WILL EXPERIENCE A WARMING TREND GOING
INTO THE WEEKEND AS SOUTHWESTERLY FLOW BRINGS IN WARMER
TEMPERATURES FROM THE SOUTHERN PORTION OF THE COUNTRY.
THE FIRST SIGNIFICANT SNOW STORM OF THE SEASON IS EXPECTED FOR THE
NORTHERN ROCKIES AS STRONG WINDS FROM THE LOWER LEVELS OF THE
ATMOSPHERE... UPWARD... GENERATE LIFT AS AIR IS FORCED UP THE
COMPLEX TERRAIN OUT WEST. UPSLOPE FLOW WILL ALSO BEGIN TO IMPACT
PORTIONS OF THE NORTHERN PLAINS BY THIS AFTERNOON... AS
SOUTHEASTERLY FLOW MOISTENS UP A DRY LAYER CLOSE TO THE SURFACE.
ALTHOUGH COLD... TEMPERATURES WILL EXIST OVER THE NORTH CENTRAL
U.S.... THEY WILL NOT BE COLD ENOUGH TO GENERATE SNOW FOR MOST
THROUGH SATURDAY MORNING.
STRONG WIND WILL ALSO BE A FACTOR WITH THIS SYSTEM... BEGINNING
TODAY IN ADVANCE OF THE UPPER TROUGH OVER PORTIONS OF NEVADA AND
EASTERN CALIFORNIA. HIGH WINDS ARE ALSO EXPECTED TO IMPACT MOST OF
THE MAJOR MOUNTAIN RANGES OUT WEST AND THROUGH PASSES AS STRONG
PRESSURE GRADIENTS SET UP WITH THE DEVELOPING STORM. STRONG WINDS
WILL ALSO ACCOMPANY THE LEADING EDGE OF COLD AIR AS IT DIVES DOWN
THROUGH THE SOUTHWEST FRIDAY NIGHT INTO SATURDAY.
ELSEWHERE... A COLD FRONT WILL SLOWLY WEAKEN AS IT MAKES ITS WAY
EAST THROUGH THE GREAT LAKES TODAY... BEFORE REDEVELOPING OFF THE
COAST OF NEW ENGLAND TONIGHT. BEHIND THE FRONT... EXPECT CLEARING
SKIES AND SLIGHTLY COOLER TEMPERATURES BEHIND THE BOUNDARY. HIGH
PRESSURE WILL BUILD DOWN THE EAST COAST FOR FRIDAY AND SATURDAY...
HOWEVER WITH A LINGERING FRONT NEAR THE COAST OF THE CAROLINAS...
AND AN UPPER LEVEL LOW MOVING EAST OVER THE SOUTHEAST STATES...
RAIN AND THUNDERSTORMS WILL STAY IN THE FORECAST FOR A GOOD DEAL
OF THE SOUTHEAST. AT THIS TIME... IT APPEARS THE HEAVIEST RAIN
WILL STAY JUST OFFSHORE... BUT NORTHERN FLORIDA AND LOCATIONS
ALONG THE SOUTHEAST COAST ARE FORECAST TO RECEIVE 1 TO 2 INCHES BY
SATURDAY MORNING.
OTTO
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