195
FXUS01 KWBC 210818
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
418 AM EDT THU AUG 21 2008
VALID 12Z THU AUG 21 2008 - 00Z SAT AUG 23 2008
TROPICAL STORM FAY IS FORECAST TO MOVE SLOWLY FROM THE NORTHEAST
COAST OF FLORIDA TO THE FLORIDA PANHANDLE BY FRIDAY EVENING.
TROPICAL STORM FAY IS ALSO FORECAST TO BECOME A TROPICAL
DEPRESSION BY FRIDAY MORNING. THE STORM WILL PRODUCE HEAVY RAIN
.. STRONG WIND
AND THUNDERSTORMS OVER MUCH OF FLORIDA AND
OTHER PARTS OF THE SOUTHEAST. PLEASE VISIT THE NATIONAL HURRICANE
CENTER WEBSITE AT WWW.NHC.NOAA.GOV FOR MORE UP TO DATE INFORMATION
ON THE FORECAST TRACK OF FAY.
MEANWHILE ... AN OLD UPPER LEVEL LOW OVER THE CENTRAL PLAINS WILL
GET PICKED UP BY A MUCH STRONGER UPPER LEVEL TROUGH MOVING
NORTHEASTWARD FROM THE NORTHWEST. SOME OF THE ENERGY WILL BE LEFT
BEHIND FORMING A NEW UPPER LEVEL LOW OVER THE SOUTHERN PLAINS.
THIS SYSTEM IS ENCOURAGING MOIST AIR TO MOVE NORTHWARD OVER THE
MISSISSIPPI VALLEY PRODUCING SHOWERS AND THUNDERSTORMS FROM THE
LOWER MISSISSIPPI VALLEY/WESTERN GULF COAST TO PARTS OF THE UPPER
MISSISSIPPI VALLEY/UPPER GREAT LAKES THROUGH FRIDAY.
ELSEWHERE ... A COLD FRONT OVER THE NORTHERN ROCKIES WILL ADVANCE
EASTWARD TO THE UPPER MIDWEST BY FRIDAY EVENING. SHOWERS AND
THUNDERSTORMS WILL DEVELOP AHEAD AND ALONG THE BOUNDARY OVER THE
NORTHERN PLAINS THROUGH FRIDAY MORNING. ON FRIDAY ... THE SYSTEM
WILL INTERCEPT THE MOIST AIR MOVING NORTHWARD OVER THE MISSISSIPPI
VALLEY PRODUCING A MUCH LARGER AREA OF SHOWERS AND THUNDERSTORMS
ALONG AND AHEAD OF THE FRONT FROM THE UPPER MIDWEST TO THE CENTRAL
PLAINS. WEST OF THE STORM ... ONSHORE FLOW WILL AID IN PRODUCING
SCATTERED RAIN OVER PARTS OF THE NORTHWEST AND NORTHERN
INTERMOUNTAIN REGION THROUGH THURSDAY NIGHT WHEN THE ONSHORE FLOW
ENDS.
ZIEGENFELDER
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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