770
FXUS01 KWBC 291915
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
314 PM EDT TUE SEP 29 2009
VALID 00Z WED SEP 30 2009 - 12Z THU OCT 01 2009
A COLD DOME OF HIGH PRESSURE OVER THE MISSISSIPPI VALLEY WILL MOVE
EASTWARD TO THE OHIO VALLEY/MID-ATLANTIC REGION BY THURSDAY.
TEMPERATURES ASSOCIATED WITH THE COLD AIR WILL RUN BELOW AVERAGE
FOR THIS TIME OF YEAR. AS THE COLD AIR MOVES OVER THE GREAT LAKES
... IN CONJUNCTION WITH ENERGY ASSOCIATED WITH AN UPPER LEVEL LOW
OVER THE NORTHEAST ... WILL PRODUCE LAKE EFFECT RAIN SHOWERS
DOWNWIND FROM THE LAKES THAT WILL BEGIN TO DIMINISH ON THURSDAY.
IN ADDITION ... THE FRONT ASSOCIATED WITH THE LEADING EDGE OF THE
COLD AIR WILL SETTLE OVER THE NORTHERN GULF OF MEXICO AND SOUTHERN
TIP OF FLORIDA TRIGGERING SCATTERED SHOWERS AND THUNDERSTORMS OVER
SOUTHERN TEXAS AND FLORIDA.
MEANWHILE ... A STRONG STORM OVER THE GREAT BASIN/ROCKIES WILL
MOVE OUT ONTO THE PLAINS BY THURSDAY. THE SYSTEM WILL PRODUCE
SCATTERED RAIN AND POST FRONTAL SNOW SHOWERS OVER THE HIGHER
ELEVATIONS OF THE NORTHERN/CENTRAL ROCKIES AND THE NORTHERN
INTERMOUNTAIN REGION/GREAT BASIN. SOME THUNDERSTORMS MAY DEVELOP
AHEAD OF THE FRONT OVER THE CENTRAL ROCKIES ON WEDNESDAY
AFTERNOON. WHEN THE STORM EMERGES FROM THE ROCKIES ... SHOWERS
AND THUNDERSTORMS WILL DEVELOP OVER THE PLAINS AND RAIN OVER THE
NORTHERN PLAINS WEDNESDAY EVENING INTO THURSDAY. SOME OF THESE
STORMS MY BECOME SEVERE.
ELSEWHERE ... MOIST FLOW AND AN APPROACHING STORM SYSTEM WILL KEEP
SHOWERS AND HIGHEST ELEVATION SNOW/RAIN OVER PORTIONS OF THE
NORTHWEST COAST.
ZIEGENFELDER
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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