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FXUS01 KWBC 142014
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
414 PM EDT MON SEP 14 2009
VALID 00Z TUE SEP 15 2009 - 12Z WED SEP 16 2009
A FAIRLY STAGNANT PATTERN IS IN STORE THE NEXT TWO DAYS AS THE
UPPER PATTERN ACROSS THE LOWER 48 IS SLOW TO EVOLVE. TWO AREAS
ACROSS THE COUNTRY WILL BE A FOCUS FOR PRECIPITATION... THE GREAT
BASIN AND CENTRAL ROCKIES... AND THE SOUTHEAST. THE NORTHEAST AND
GREAT LAKES WILL SEE A COLD FRONTAL PASSAGE WITH LITTLE FANFARE.
IN THE WEST... THE MID/UPPER-LEVEL REMAINS OF A COLD FRONT THAT
PUSHED THROUGH CALIFORNIA WILL MEANDER AROUND UTAH THROUGH
WEDNESDAY. THIS WILL AID IN PRODUCING SHOWERS AND THUNDERSTORMS
THAT WILL BE INVIGORATED BY AFTERNOON HEATING AND TERRAIN. THE
AREAL EXTENT SHOULD DIMINISH SOME EACH DAY AS THE UPPER FEATURE
WEAKENS... EVENTUALLY CONFINING PRECIPITATION TO THE CENTRAL
ROCKIES AND NEW MEXICO. A PACIFIC COLD FRONT AND ITS PRECIPITATION
SHIELD SHOULD BE LURKING JUST WEST OF WASHINGTON STATE BY
WEDNESDAY MORNING.
IN THE SOUTHEAST... A DIFFERENT UPPER LEVEL LOW WILL WOBBLE AROUND
ARKANSAS AND CONTINUE TO WRAP MOISTURE INTO THE AREA WITH ITS
GENERAL CYCLONIC CIRCULATION. A SURFACE BOUNDARY WILL GRADUALLY
BECOME DIFFUSE AND DISSIPATE BUT THE TRIGGER FOR SHOWERS AND
STORMS WILL REMAIN. SOME AREAS MAY RECEIVE LOCALLY MODERATE
AMOUNTS OF PRECIPITATION AS THE DISTURBANCE SHOWS NO SIGN OF A
QUICK EXIT.
LASTLY... A MAINLY DRY COLD FRONT WILL USHER IN SOME COOLER AIR TO
THE GREAT LAKES AND NORTHEAST BEFORE STALLING ALONG THE OHIO RIVER
VALLEY WEDNESDAY MORNING. SOME LIGHT RAIN IS POSSIBLE IN THE
MID-ATLANTIC REGION BY THIS TIME.
FRACASSO
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
A
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