008
FXUS01 KWBC 250839
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
439 AM EDT THU SEP 25 2008
VALID 12Z THU SEP 25 2008 - 00Z SAT SEP 27 2008
AN EARLY FALL COASTAL STORM IS BREWING OFF THE CAROLINA COAST AND
ITS IMPACTS IN THE FORM OF HEAVY RAINFALL...POWERFUL WAVES...AND
GUSTY WINDS HAVE ALREADY BEGUN TO AFFECT THE OUTER BANKS. AS THE
SYSTEM PROGRESSES CLOSER TO THE EASTERN SEABOARD ON
THURSDAY...CITIES FARTHER INLAND WILL BEGIN TO SEE WIND SPEEDS
PICK UP ALONG WITH AN INCREASE IN THE RAINFALL COVERAGE. WITH A
STRONG ANTICYCLONE POSITIONED ACROSS THE CANADIAN MARITIMES...THE
PRESSURE GRADIENT CREATED BETWEEN THESE TWO WEATHER FEATURES IS
CREATING BREEZY CONDITIONS WHICH EXTENDS NORTHWARD UP INTO COASTAL
MAINE. WHILE THE WINDS SHOULD BEGIN TO DIMINISH ACROSS THE
MID-ATLANTIC STATES BY FRIDAY...THE THREAT FOR RAIN WILL REMAIN AS
THIS SYSTEM WILL BE SLOW TO EXIT THE EASTERN U.S. THE TEMPERATURES
ACROSS MUCH OF THE NORTHEASTERN QUARTER OF THE NATION WILL SEE
HIGHS ONLY IN THE 60S THE NEXT COUPLE OF DAYS UNDERNEATH AN
EXPANSIVE CLOUD DECK COMBINED WITH NUMEROUS SHOWERS AND
THUNDERSTORMS.
A MID-LEVEL TROUGH CURRENTLY MOVING INTO THE PACIFIC NORTHWEST
WILL CARRY A FRONTAL SYSTEM INLAND EARLY THURSDAY MORNING. AS THE
BOUNDARY MOVES ONSHORE...AN ENHANCED ONSHORE FLOW ALONG THE
COASTLINE WILL HELP SPAWN WIDESPREAD RAIN SHOWERS THROUGHOUT THE
DAY ON THURSDAY. AS THE SYSTEM MOVES FARTHER INLAND...DOWNSLOPING
WINDS ALONG THE LEE SIDE OF THE CASCADES WILL DIMINISH THE CHANCES
FOR MEASURABLE PRECIPITATION FOR LOCATIONS FARTHER AWAY FROM THE
COAST. MEANWHILE...SCATTERED SHOWERS COULD STILL LINGER INTO
THURSDAY EVENING AND NIGHT ACROSS THE COASTAL REGIONS AS ENOUGH
PACIFIC MOISTURE WILL STICK AROUND TO KEEP CONDITIONS UNSETTLED.
AS THIS WEATHER SYSTEM MARCHES ACROSS THE ROCKIES AND INTO THE
NORTHERN PLAINS...IT WILL BEGIN TO TAP INTO GULF MOISTURE PROVIDED
BY A 15 TO 20 MPH SOUTHERLY FLOW MOVING THROUGH THE LOWER MISSOURI
VALLEY AND INTO THE UPPER MIDWEST. THE COMBINATION OF THE ENHANCED
MOISTURE CONTENT AND LIFT PROVIDED BY THE FRONTAL BOUNDARY WILL
HELP SPAWN MODERATE TO HEAVY SHOWERS AND THUNDERSTORMS ACROSS THE
NORTHERN PLAINS AND UPPER MISSISSIPPI VALLEY BY FRIDAY EVENING.
CONDITIONS WILL BE QUITE TRANQUIL FOR THE REMAINDER OF THE WORK
WEEK ACROSS THE LOWER AND MIDDLE MISSISSIPPI VALLEYS AS THIS
PORTION OF THE U.S. WILL BE IN BETWEEN THE TWO PREVIOUSLY
MENTIONED SYSTEMS. MOSTLY SUNNY SKIES COMBINED WITH HIGH
TEMPERATURES PUSHING INTO THE 80S WILL BE COMMONPLACE INTO THE
WEEKEND. IN ADDITION...WITH NO SIGNIFICANT UPPER-LEVEL
DISTURBANCES CROSSING THE AREA...RAINFALL IS NOT EXPECTED TO BE A
PROBLEM DURING THE NEXT COUPLE OF DAYS. THIS IS DEFINITELY
WELCOMED AS ISOLATED AREAS ARE STILL EXPERIENCING RIVER FLOODING
FROM THE REMNANTS OF HURRICANE IKE A COUPLE OF WEEKS AGO.
RUBIN-OSTER
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