497
FXUS01 KWBC 131910
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
310 PM EDT SUN SEP 13 2009
VALID 00Z MON SEP 14 2009 - 12Z TUE SEP 15 2009
THE NEXT COUPLE OF DAYS WILL REMAIN WET AND UNSETTLED FROM THE
SOUTHERN PLAINS INTO THE CENTRAL GULF COASTS STATES AND TENNESSEE
VALLEY AS A SLOW MOVING UPPER LEVEL CYCLONE CENTERED OVER THE
SOUTHERN PLAINS DRIFTS VERY SLOWLY TO THE EAST. THIS SYSTEM WILL
CONTINUE TO PULL MOISTURE FROM THE GULF OF MEXICO INTO A REGION
THAT IS ALREADY VERY MOIST AND UNSTABLE. THIS WILL ENCOURAGE
SHOWERS AND THUNDERSTORMS...WITH SOME STRONG EMBEDDED STORMS AND
HEAVY RAINS ACROSS THE REGION. FURTHER TO THE EAST...A STALLED
FRONTAL BOUNDARY EXTENDING ALONG THE GULF COAST THROUGH NORTHERN
FLORIDA ALONG WITH WEAKER DISTURBANCES LIFTING OUT AHEAD OF THE
MAIN CYCLONE WILL ENCOURAGE AT LEAST SCATTERED SHOWERS AND
THUNDERSTORMS INTO THE SOUTHEAST STATES.
TO THE NORTH...A WEAK COLD FRONT WILL SWEEP SOUTHEASTWARD ACROSS
THE GREAT LAKES AND NORTHEAST...ACCOMPANIED BY A FEW SCATTERED
SHOWERS TOMORROW. OTHERWISE HIGH PRESSURE AND DRY CONDITIONS ARE
EXPECTED TO DOMINATE FROM THE UPPER MIDWEST THROUGH THE NORTHEAST
AND MID ATLANTIC STATES THROUGH THE NEAR TERM.
AN UPPER LOW WILL LIFT NORTHWARD ACROSS WYOMING AND MONTANA INTO
CANADA AROUND THE WEST SIDE OF A SOUTHERN CANADIAN UPPER RIDGE.
THIS SYSTEM IS EXPECTED TO TRIGGER A FEW SHOWERS LATE TODAY INTO
EARLY TOMORROW THROUGH PARTS OF THE NORTHERN HIGH PLAINS BEFORE
LIFTING INTO CANADA. FARTHER WEST...AN UPPER DISTURBANCE IS
EXPECTED TO PUSH INLAND ACRS THE CENTRAL PACIFIC COAST REGION
SUNDAY NIGHT INTO MONDAY. A BAND OF SHOWERS IS EXPECTED TO
ACCOMPANY THE ASSOCIATED COLD FRONT AS IT WEAKENS WHILE MOVING
INTO NORTHERN CALIFORNIA TONIGHT. AS THE UPPER TROF MAKES ITS WAY
INTO THE GREAT BASIN ON MONDAY...AN ASSOCIATED COLD POOL ALOFT
SHOULD HELP PAVE THE WAY FOR MORE WIDESPREAD AFTERNOON
SHOWER/THUNDERSTORM ACTIVITY ACROSS THE GREAT BASIN EASTWARD INTO
PARTS OF THE CENTRAL AND SOUTHERN ROCKIES.
PEREIRA
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