783
FXUS01 KWBC 242050
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
449 PM EDT WED SEP 24 2008
VALID 00Z THU SEP 25 2008 - 12Z FRI SEP 26 2008
A LOW PRESSURE SYSTEM CURRENTLY CENTERED OFF THE SOUTHEAST U.S.
COASTLINE IS EXPECTED TO BEGIN TO GRADUALLY INTENSIFY AND MOVE
NORTHWEST BY THURSDAY TOWARD THE MID-ATLANTIC STATES. THE SYSTEM
IS EXPECTED TO MOVE INLAND BY EARLY FRIDAY BEFORE THEN SLOWLY
PUSHING NORTHWARD THROUGH THE CAROLINAS. STRONG ONSHORE FLOW
ASSOCIATED WITH THE STORM SYSTEM WILL BRING COPIOUS AMOUNTS OF
ATLANTIC MOISTURE INLAND ACROSS THE REGION...WITH THE POTENTIAL
FOR HEAVY RAINFALL FROM THE CAROLINAS NORTHWARD INTO SOUTHERN NEW
ENGLAND. THE STRONG WINDS...WHICH ARE EXPECTED TO INCREASE TO 40
TO 50 MPH LOCALLY...WILL BE ENHANCED BY THE INTERACTION BETWEEN
THIS LOW PRESSURE SYSTEM AND STRONG HIGH PRESSURE MOVING EAST OF
NEW ENGLAND AND WILL LEAD TO BEACH EROSION AND A THREAT OF COASTAL
FLOODING.
ACROSS THE MISSISSIPPI VALLEY...A COLD FRONT IS FORECAST TO WEAKEN
AS IT PROGRESSES EASTWARD. HOWEVER...WHILE TEMPERATURES WILL DIP
SLIGHTLY AS THE FRONT PASSES...THE MOST SIGNIFICANT CHANGE WILL BE
A DROP IN HUMIDITY. SCATTERED SHOWERS ARE POSSIBLE THIS EVENING
ALONG THIS FRONTAL BOUNDARY...WITH THE THREAT OF RAIN DIMINISHING
OVERNIGHT. NO SIGNIFICANT PRECIPITATION AMOUNTS ARE EXPECTED WITH
THIS FRONT.
A STORM SYSTEM OFF THE NORTHWEST U.S. COAST IS EXPECTED TO MOVE
INLAND OVERNIGHT...BRINGING ADDITIONAL PRECIPITATION TO THE
PACIFIC NORTHWEST. WHILE RAIN IS THE GENERAL THREAT ACROSS THIS
REGION...SUFFICIENT COLD AIR IS EXPECTED TO ARRIVE ALOFT FOR SOME
OF THE HIGHER ELEVATIONS TO SEE SOME SNOW...SUCH AS THE WASHINGTON
CASCADES THROUGHOUT THURSDAY AND FRIDAY. ALTHOUGH THIS SHOULD BE
CONFINED TO THE HIGHEST PEAKS. ONCE INLAND...THE NORTHERN PORTION
OF THE FRONTAL SYSTEM WILL WEAKEN WHILE THE SOUTHERN PORTION WILL
CONTINUE TO PROPAGATE EAST ACROSS THE PACIFIC NORTHWEST BEFORE
JOINING UP WITH A FRONTAL SYSTEM ACROSS SOUTHWEST CANADA. THIS
FRONT SHOULD THEN MOVE EASTWARD ACROSS THE INTERMOUNTAIN REGION
AND THEN PUSH INTO THE NORTHERN PLAINS BY MIDDAY FRIDAY.
COLLINS
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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