722
FXUS01 KWBC 040838
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
437 AM EDT SAT OCT 04 2008
VALID 12Z SAT OCT 04 2008 - 00Z MON OCT 06 2008
A DEEP TROUGH OF LOW PRESSURE ALOFT WILL CONTINUE TO MOVE ACROSS
THE WEST DURING THE NEXT COUPLE OF DAYS WHICH WILL USHER IN
SIGNIFICANTLY COOLER AIR AT THE SURFACE. WIDESPREAD CLOUDS AND
PRECIPITATION... WHICH ALREADY COVER MOST AREAS FROM THE WEST
COAST THROUGH THE INTERMOUNTAIN WEST... WILL SLOWLY EDGE EAST AS
THE UPPER TROUGH MOVES THROUGH THE REGION. MOST WILL SEE RAIN FROM
THIS SYSTEM... HOWEVER ELEVATIONS ABOVE ROUGHLY 8000 FEET WILL
LIKELY SEE AT LEAST SOME SNOW WITH SIGNIFICANT SNOW ACCUMULATIONS
POSSIBLE AT ELEVATIONS OVER 9000 FEET. STRONG WINDS ARE ALSO
LIKELY TO ACCOMPANY THIS SYSTEM... ESPECIALLY ACROSS REGIONS OF
HIGH TERRAIN. ALTHOUGH SNOW LEVELS ARE CURRENTLY HIGH ACROSS THE
CENTRAL ROCKIES... EXPECT THESE LEVELS TO DROP TO NEAR 7000 FEET
AS COOLER AIR MOVES IN... ALLOWING FOR SEVERAL INCHES OF WET SNOW
TO FALL... WITH HIGHER TOTALS LIKELY AS ONE MOVES UP IN ALTITUDE.
THE GREATEST PRECIPITATION TOTALS WILL OCCUR WITHIN REGIONS OF
UPSLOPE FLOW WITH SIGNIFICANTLY LESS IN RAIN SHADOW REGIONS.
ACROSS WESTERN PORTIONS OF THE CENTRAL AND SOUTHERN PLAINS...
TODAY WILL BE DRY WITH HIGH TEMPERATURES ABOUT 10 DEGREES ABOVE
NORMAL. HOWEVER... CONDITIONS WILL CHANGE FOR SUNDAY AND MONDAY
AS THE UPPER TROUGH APPROACHES. SHOWERS AND THUNDERSTORMS... SOME
STRONG... ARE EXPECTED TO BREAK OUT DURING THE AFTERNOON ON SUNDAY
ACROSS THE TEXAS AND OKLAHOMA PANHANDLES... AND SPREAD NORTH AND
EAST OVERNIGHT. MUCH COOLER TEMPERATURES WILL FOLLOW INTO THE
PLAINS AS THE UPPER TROUGH MOVES IN BEGINNING ON SUNDAY.
OVER THE NORTHEAST... LITTLE CHANGE IS EXPECTED THIS WEEKEND AS
HIGH PRESSURE CONTINUES TO BUILD OVER THE REGION. SKIES WILL BE
PARTLY CLOUDY FOR MOST... WITH GREATER COVERAGE IN THE LEE OF THE
GREAT LAKES AS LINGERING LAKE EFFECT RAIN SHOWERS WILL CONTINUE
INTO SUNDAY. A STATIONARY FRONT WILL REMAIN FROM THE MID
ATLANTIC... WESTWARD INTO THE CENTRAL AND NORTHERN PLAINS...
KEEPING COOL AIR IN PLACE FROM THE UPPER MISSISSIPPI VALLEY...
EASTWARD. ANOTHER FRONT ACROSS THE SOUTHERN PLAINS WILL SLOWLY
DISSIPATE AS IT MOVES NORTH IN RESPONSE TO SOUTHERLY FLOW IN THE
LOWER LEVELS OF THE ATMOSPHERE. AS WARM AIR RIDES UP OVER THE
FRONT... PRECIPITATION WILL CONTINUE OVER OKLAHOMA INTO MISSOURI
TODAY... AND DEVELOP FARTHER NORTH INTO THE NORTH CENTRAL U.S. FOR
SATURDAY NIGHT AS MOISTURE IS ADVECTED NORTH AHEAD OF THE UPPER
TROUGH OVER THE WEST.
OTTO
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