488
FXUS01 KWBC 070900
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
500 AM EDT WED OCT 07 2009
VALID 12Z WED OCT 07 2009 - 00Z FRI OCT 09 2009
THE UPPER PATTERN OVER THE LOWER 48 IS SUCH THAT NUMEROUS SURGES
OF CANADIAN/ARCTIC AIR WILL BE SWEEPING INTO THE NORTH CENTRAL
U.S. AND CONTINUING TOWARD THE EAST WHILE MODIFYING. THE FIRST
FRONT... CURRENTLY NEAR THE APPALACHIANS... WILL MOVE ACROSS THE
EAST TODAY FOLLOWED BY GUSTY WEST WINDS AT THE SURFACE. THOUGH
WARM TEMPERATURES SHOULD REMAIN TODAY OVER THE MID ATLANTIC AND
SOUTHEAST... LOW DEWPOINTS AND HIGH PRESSURE BEHIND THE FRONT
SHOULD ALLOW FOR A VERY AUTUMN-LIKE THURSDAY MORNING FOR MANY
LOCATIONS EAST OF THE MISSISSIPPI. WARMING WILL BEGIN RETURNING TO
THE EAST ON FRIDAY AS SOUTHERLY FLOW ADVECTS WARMER TEMPERATURES
FROM THE SOUTH AHEAD OF THE NEXT SHOT OF COLDER AIR.
THAT NEXT SHOT OF COLDER AIR IS CURRENTLY MOVING INTO MONTANA THIS
MORNING AND WILL QUICKLY MOVE SOUTH DURING THE DAY TODAY. UPSLOPE
FLOW BEHIND THE COLD FRONT ALONG WITH UPPER LEVEL ENERGY WILL
PRODUCE SNOW SHOWERS FOR CENTRAL AND EASTERN PORTIONS OF THE
NORTHERN TO CENTRAL ROCKIES INTO FRIDAY. YET A THIRD COLD FRONT IS
EXPECTED TO REACH THE NORTH CENTRAL U.S. EARLY FRIDAY WHICH WILL
BRING TEMPERATURES WELL BELOW NORMAL WITH MANY TEMPERATURES INTO
THE TEENS EXPECTED FOR PORTIONS OF THE NORTHERN ROCKIES.
THE OTHER BIG STORY ACROSS THE LOWER 48 IS THE POTENTIAL FOR HEAVY
AND POSSIBLY FLOODING RAINS FROM EASTERN OKLAHOMA INTO SOUTHERN
ILLINOIS AND INDIANA BEGINNING LATE TONIGHT. VERY MOIST AIR WILL
BE TRANSPORTED TO THE NORTH OVER A COLD FRONT WHICH WILL LAY
ACROSS THE SOUTH... PRODUCING WIDESPREAD RAIN AND EMBEDDED
THUNDERSTORMS LASTING THROUGH THURSDAY NIGHT. THE HPC QPF
DISCUSSION WILL HAVE MORE DETAILED INFORMATION ON THIS UPCOMING
SIGNIFICANT EVENT.
OTTO
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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