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FXUS01 KWBC 262000
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
400 PM EDT MON OCT 26 2009
VALID 00Z TUE OCT 27 2009 - 12Z WED OCT 28 2009
AMPLE MID-LEVEL ENERGY COUPLED WITH MOISTURE LADEN SOUTHERLY FLOW
FROM THE GULF OF MEXICO IS CURRENTLY BRINGING ANOTHER SOAKING TO
THE SOUTH CENTRAL U.S. STATES. AS THE ASSOCIATED COLD FRONT
MARCHES EASTWARD OVER THE NEXT COUPLE OF DAYS...HEAVY RAIN CAN BE
EXPECTED ALONG THE STATES BORDERING THE GULF OF MEXICO...AND INTO
GEORGIA. TO THE NORTH A SECOND...BUT SMALLER...MID-LEVEL ENERGY
MAXIMUM IS CREATING SHOWERY CONDITIONS OVER THE UPPER GREAT LAKES.
IT WILL PROGRESS EASTWARD INTO THE LOWER GREAT LAKES REGION BEFORE
DISSIPATING TUESDAY EVENING. RAIN WILL CONTINUE TO FALL ALONG THE
EAST COAST FROM THE MID-ATLANTIC STATES TO CENTRAL FLORIDA THROUGH
WEDNESDAY.
WIDESPREAD SNOW IS EXPECTED TO IMPACT THE WESTERN U.S. BEHIND THE
FRONTAL SYSTEM NOW MOVING INLAND. THIS EXCEPTIONALLY DEEP TROUGH
WILL RAPIDLY MOVE EASTWARD AS THE WEEK PROGRESSES. TEMPERATURES
WILL PLUNGE BEHIND THE FRONT DROPPING THE FREEZING LEVEL AND
CREATING CONDITIONS FAVORABLE FOR WIDESPREAD SNOW AS FAR SOUTH AS
CENTRAL ARIZONA ON WEDNESDAY. TEMPERATURES MAY DROP AS MUCH AS 30
DEGREES BEHIND THE FRONT. HIGH WINDS WILL ALSO BE PREVALENT ACROSS
MUCH OF THE DESERT SOUTHWEST AS A RESULT OF THIS SYSTEM.
THE HIGH PRESSURE CURRENTLY SITUATED IN THE INTERMOUNTAIN WEST
WILL BE PUSHED EASTWARD OVER THE GREAT PLAINS AS THE PACIFIC FRONT
MOVES FURTHER INLAND. AREAS IN THE CENTER OF THE COUNTRY THAT ARE
CURRENTLY BEING AFFECTED BY THE RAIN WILL SOON HAVE SUNNY SKIES
AND WARMER DAYTIME TEMPERATURES. ACROSS THE CENTRAL AND SOUTHERN
PLAINS...TEMPERATURES WILL BE COLD AT NIGHT SINCE THERE WILL BE
VERY LITTLE CLOUD COVER TO HELP HOLD IN THE DAYTIME HEATING.
COLLINS
GRAPHIC AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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