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FXUS01 KWBC 300751
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
351 AM EDT FRI OCT 30 2009
VALID 12Z FRI OCT 30 2009 - 00Z SUN NOV 01 2009
A VERY AMPLIFIED UPPER LEVEL PATTERN IN PLACE AT THE START OF THE
SHORT RANGE PERIOD WILL TRANSITION TO A RELATIVELY FLAT...
EAST-WEST FLOW BY SUNDAY. A STRONG COLD FRONT CURRENTLY MOVING
THROUGH THE LOWER MISSISSIPPI VALLEY WILL CONTINUE MOVING EAST
INTO THE WEEKEND... THOUGH IT WILL LOSE SOME OF ITS PUNCH AS ITS
ASSOCIATED MAIN UPPER LEVEL SUPPORT MOVES FROM THE CENTRAL PLAINS
INTO ONTARIO.
A STRONG FETCH OF SOUTHERLY FLOW IN THE LOW LEVELS OF THE
ATMOSPHERE ALONG WITH A SLOWER PROGRESSION OF THE FRONT ACROSS THE
SOUTH WILL CONTINUE TO SUPPORT A RELATIVELY NARROW CORRIDOR OF
MODERATE TO HEAVY RAIN ALONG THE COLD FRONT EXTENDING INTO THE
OHIO VALLEY TODAY WITH CONTINUED FLOODING CONCERNS. WEAKENED UPPER
LEVEL SUPPORT SHOULD LEAD TO LESS ORGANIZED RAINFALL WITH LIGHTER
TOTALS ON SATURDAY WITH THE FRONT FOR THE EASTERN THIRD OF THE
COUNTRY. THOUGH SKIES SHOULD BE MOSTLY CLOUDY AHEAD OF THE COLD
FRONT... THE STRONG SOUTHERLY FLOW WILL ALLOW DAYTIME TEMPERATURES
TO WARM NICELY FOR LATE OCTOBER JUST AHEAD OF THE COLD FRONT TODAY
AND SATURDAY.
TOWARD THE WEST... WELL BELOW AVERAGE TEMPERATURES IN PLACE FOR
THE WESTERN HALF OF THE COUNTRY WILL SLOWLY BEGIN TO WARM WITH
SLIGHTLY ABOVE AVERAGE TEMPERATURES EXPECTED ON SATURDAY FOR THE
PLAINS AS UPPER LEVEL RIDGING MOVES EAST FROM THE EASTERN PACIFIC.
SNOW CURRENTLY FALLING OVER PORTIONS OF THE CENTRAL PLAINS WILL
END FROM SOUTHWEST TO NORTHEAST DURING THE DAY TODAY WITH LIGHT
ADDITIONAL ACCUMULATIONS EXPECTED FOR EASTERN PORTIONS OF THE
NORTHERN PLAINS AND PERHAPS SOME MODERATE ACCUMULATIONS FOR
NORTHERN MINNESOTA THROUGH TONIGHT.
THE NORTHWEST WILL CONTINUE TO EXPERIENCE WET CONDITIONS WITH
PERSISTENT ONSHORE FLOW THIS WEEKEND. THE APPROACH OF A PACIFIC
COLD FRONT WILL BRING INCREASED MOISTURE AND A PERIOD OF MODERATE
TO HEAVY RAINFALL TO THE NORTHWEST BEGINNING TONIGHT WITH
RELATIVELY HIGH SNOW LEVELS IN THE CASCADES. AS THE COLD FRONT
MOVES THROUGH... PRECIPITATION WILL BECOME MORE SCATTERED IN
NATURE AND MOSTLY UPSLOPE DRIVEN FOR THE LATTER HALF OF THE
WEEKEND.
OTTO
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