947
FXUS01 KWBC 210737
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
336 AM EDT MON SEP 21 2009
VALID 12Z MON SEP 21 2009 - 00Z WED SEP 23 2009
AS THE UPPER LEVEL JET STREAM DIVES SOUTH THROUGH THE
INTERMOUNTAIN WEST...A VIGOROUS UPPER LEVEL CYCLONE IS FORECAST TO
DEVELOP OVER THE NORTHERN AND CENTRAL HIGH PLAINS. THIS WILL SEND
A WELL-DEFINED COLD FRONT PLUNGING SOUTH THROUGH THE WESTERN U.S.
INTO NORTHERN MEXICO WHILE PUSHING OUT ACROSS THE PLAINS INTO THE
MISSISSIPPI VALLEY. WHILE THE COLD DOME OF HIGH PRESSURE IN THE
WAKE OF THIS SYSTEM WILL AFFORD A CHILLY START TO THE WORK WEEK
ACROSS THE INTERMOUNTAIN WEST...IT WILL ALSO SET THE STAGE FOR
HOT...DRY...WINDY CONDITIONS ALONG THE WEST COAST. ALTHOUGH THIS
SYSTEM MAY BRING SOME SCATTERED SHOWERS AND THUNDERSTORMS TO
PORTIONS OF THE INTERMOUNTAIN WEST/ROCKIES AND EVEN SOME LIGHT
SNOWS TO SOME OF THE HIER PEAKS...THE BETTER CHANCE FOR
PRECIPITATION WILL BE FURTHER TO THE EAST ALONG THE EASTERN EXTENT
OF THE ASSOCIATED FRONTAL SYSTEM. MORE ORGANIZED SHOWERS AND
THUNDERSTORMS...WITH SOME EMBEDDED HEAVY RAINS ARE POSSIBLE ACROSS
PARTS OF THE PLAINS AND MISSISSIPPI VALLEY LATER TODAY AS
SOUTHERLY WINDS DRAW A MOIST UNSTABLE AIRMASS UP ALONG THIS
BOUNDARY.
FURTHER TO THE EAST...SHOWERS AND THUNDERSTORMS ASSOCIATED WITH AN
UPPER LEVEL DISTURBANCE LIFTING ACROSS THE GREAT LAKES THIS
MORNING AND AN AXIS OF MOIST SOUTHERLY INFLOW EXTENDING BACK TO
THE GULF OF MEXICO SHOULD CONTINUE THROUGH THE DAY TODAY.
AND FINALLY ACROSS THE SOUTHEAST AND MID ATLANTIC
STATES...ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE
POSSIBLE IN ASSOCIATION WITH AN WESTERLY MOVING TROPICAL WAVE
ADVANCING TOWARD THE REGION.
PEREIRA
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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