264
FXUS01 KWBC 241941
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
340 PM EDT THU SEP 24 2009
VALID 00Z FRI SEP 25 2009 - 12Z SAT SEP 26 2009
THE UNSEASONABLY STRONG CLOSED UPPER LEVEL LOW IN PLACE OVER THE
CENTRAL HIGH PLAINS IS EXPECTED TO WEAKEN SOMEWHAT AND BEGIN
SHIFTING EASTWARD INTO THE BEGINNING OF THE WEEKEND. THIS WILL
OCCUR AS THE TAIL END OF A QUICK MOVING UPPER LEVEL TROUGH THROUGH
CANADA INTERACTS WITH THE CLOSED LOW OVER THE PLAINS. AS A
RESULT... LOCATIONS THROUGHOUT THE CENTRAL AND SOUTHERN PLAINS
WILL EXPERIENCE A WARMING TREND... WITH MAX TEMPERATURES RETURNING
TO THE 70S AND 80S BY SATURDAY. SCATTERED LIGHT SHOWERY PRECIP
WILL LINGER OVER THE CENTRAL PLAINS INTO COLORADO UNTIL SATURDAY
WHEN THE UPPER LOW BEGINS TO DEPART.
EAST OF THE CENTRAL PLAINS... HIGH LEVELS OF MOISTURE ARE ALREADY
IN PLACE AHEAD OF THE PRIMARY FRONTAL BOUNDARY LAYING ACROSS THE
OHIO AND MISSISSIPPI VALLEYS WILL ALLOW FOR MODERATE RAIN OVER
PORTIONS OF THE EASTERN THIRD OF THE LOWER 48. ONE AREA IS
CURRENTLY VISIBLE ON RADAR IMAGERY OVER THE MIDWEST AND IS
FORECAST TO SLOWLY SLIDE TOWARD THE EAST TONIGHT IN ASSOCIATION
WITH UPPER LEVEL ENERGY TRAVELING ON THE EAST SIDE OF THE UPPER
TROUGH. ADDITIONAL RAIN IS EXPECTED TO INTENSIFY LATER TONIGHT
ACROSS NORTHERN MISSOURI INTO SOUTHERN MINNESOTA. TOTAL RAINFALL
AMOUNTS COULD EXCEED ONE INCH FOR PORTIONS OF IOWA BY TOMORROW
EVENING.
THE NORTHEAST AND MID ATLANTIC ARE EXPECTED TO SEE A SIGNIFICANT
DROP IN TEMPERATURE BY SATURDAY AS A LARGE DOME OF HIGH PRESSURE
DROPS IN BEHIND TWO SURGES OF COLDER AIR... THE FIRST CURRENTLY
ANALYZED ACROSS THE NORTHERN MID ATLANTIC. MOSTLY CLEAR SKIES
SHOULD DEVELOP OVER MUCH OF THE NORTHEAST BEGINNING TOMORROW AND
LAST THROUGH SATURDAY ONCE THE SURFACE RIDGE MOVES IN.
OUT WEST... A COLD FRONT IS FORECAST TO BRING COOLER WEATHER TO
THE NORTHWEST U.S. AND SOUTHWESTERN CANADA WHERE MUCH ABOVE
AVERAGE TEMPERATURES HAVE BEEN IN PLACE IN RECENT DAYS.
PRECIPITATION WILL REMAIN CONFINED TO BRITISH COLUMBIA AS THIS IS
WHERE THE BULK OF THE JET ENERGY AND ONSHORE FLOW WILL RESIDE.
LOCATIONS ACROSS THE THE REST OF THE WESTERN U.S. TO THE WEST OF
THE ROCKIES WILL CONTINUE TO EXPERIENCE DRY WEATHER WITH ABOVE
AVERAGE TEMPERATURES.
OTTO
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