055
FXUS01 KWBC 221915
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
315 PM EDT THU OCT 22 2009
VALID 00Z FRI OCT 23 2009 - 12Z SAT OCT 24 2009
THE CLOSED SURFACE LOW CURRENTLY ENTERING THE CENTRAL MISSISSIPPI
VALLEY WILL CONTINUE TO DEEPEN AS IT LIFTS NORTHWARD TOWARDS THE
GREAT LAKES. TEMPERATURES BEHIND THE COLD FRONT ARE RAPIDLY
DECREASING...DROPPING TEMPERATURES WELL BELOW NORMAL FOR THIS TIME
OF YEAR. AREAS IN THE CENTRAL PLAINS HAVE SEEN TEMPERATURES ALMOST
30 DEGREES COOLER THAN THEIR AVERAGE HIGHS FOR THIS TIME OF YEAR.
AHEAD OF THE COLD FRONT A SWATH OVER VERY HEAVY RAIN IS FALLING.
SOUTHERLY FLOW FROM THE GULF OF MEXICO WILL CONTINUE TO FEED
MOISTURE INTO THIS SYSTEM AHEAD OF THE FRONT. AS A RESULT...FLOOD
WATCHES AND WARNINGS ARE IN EFFECT THROUGHOUT THE SOUTHERN
MISSISSIPPI VALLEY. MORE ARE EXPECTED TO BE ISSUED AS THE FRONT
PROGRESSES EASTWARD.
LIGHT TO MODERATE RAIN IS ALSO FALLING TO THE NORTH AND EAST OF
THE CLOSED LOW...ALONG A FRONT EXTENDING FROM ANOTHER SURFACE LOW
CURRENTLY SITUATED OVER THE GREAT LAKES. THIS LOW IS EXPECTED TO
RAPIDLY EXIT THE AREA TAKING A NORTHEASTERLY TRACK...BUT THE
ASSOCIATED FRONT WILL NOT EXIT ALONG WITH IT. A LARGELY STATIONARY
FRONT WILL REMAIN DRAPED ACROSS THE OHIO VALLEY...EXTENDING TO THE
COAST THROUGH THE NORTHERN MID-ATLANTIC STATES THROUGH MID
AFTERNOON FRIDAY. BY FRIDAY EVENING IT WILL BE ABSORBED BY THE
CENTRAL PLAINS SYSTEM AS IT LIFTS NORTHWARD TOWARDS THE GREAT
LAKES. THIS GUARANTEES THE OHIO VALLEY CAN EXPECT RAIN STARTING
THIS EVENING...AND LASTING THROUGH AT LEAST PART OF THE WEEKEND.
AREAS IN THE WEST CENTRAL PLAINS AND IOWA...WEST OF THE MAIN LOW
CENTER...WILL SEE A CHANGE OVER FROM RAIN TO SNOW AS TEMPERATURES
DROP THIS EVENING.
THE PACIFIC NORTHWEST IS ENJOYING A BRIEF RESPITE FROM RAIN THIS
AFTERNOON BEFORE ANOTHER PACIFIC STORM SYSTEM BRINGS MORE
PRECIPITATION TO THE AREA STARTING EARLY FRIDAY MORNING. AHEAD OF
THE FRONTAL SYSTEM LIGHT RAIN WILL FALL ALONG THE U.S.
COAST...WHILE SOME AREAS IN BRITISH COLUMBIA MAY SEE SNOW SHOWERS.
PRECIPITATION WILL INCREASE AS THE STORM MOVES INLAND. SNOW WILL
BE POSSIBLE IN THE U.S. WHEN THE SYSTEM REACHES THE HIGHER TERRAIN
OF THE INTERMOUNTAIN WEST.
COLLINS
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