733
FXUS01 KWBC 222017
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
417 PM EDT MON SEP 22 2008
VALID 00Z TUE SEP 23 2008 - 12Z WED SEP 24 2008
MOST OF THE ACTIVE WEATHER ACROSS THE LOWER 48 IS IN ASSOCIATION
WITH UPPER LEVEL TROUGHING OVER THE NORTHWEST. A SLOW MOVING COLD
FRONT... CURRENTLY OVER THE NORTHERN PLAINS... WILL BE THE FOCUS
FOR POTENTIALLY STRONG TO SEVERE STORMS THIS EVENING AND OVERNIGHT
ACROSS THE DAKOTAS AS THE UPPER TROUGHING EDGES EAST. THE GREATEST
THREAT OF SEVERE WEATHER WILL BE LARGE HAIL... ALTHOUGH TORNADOES
AND DAMAGING STRAIGHT LINE WINDS ARE ALSO POSSIBLE. THESE STORMS
WILL BE FUELED BY DYNAMICS ASSOCIATED WITH THE UPPER LEVEL TROUGH
AND MODERATE SOUTHERLY WINDS IN THE LOWER LEVELS OF THE ATMOSPHERE
WHICH WILL HELP TO REINFORCE MOISTURE ACROSS THE REGION.
ADDITIONAL SHOWERS AND THUNDERSTORMS ARE ANTICIPATED SOUTHWARD
ALONG THE COLD FRONT TONIGHT... INTO THE CENTRAL PLAINS. SHOWERS
WILL FOLLOW ALONG WITH THE FRONT INTO THE WESTERN GREAT LAKES
REGION FOR TUESDAY AS THE COLD FRONT ADVANCES EASTWARD. DRIER
WEATHER WILL MOVE INTO THE NORTHERN CENTRAL U.S. AS HIGH PRESSURE
BUILDS INTO THE REGION BEHIND THE COLD FRONT. CONDITIONS WILL BE
IMPROVING ACROSS THE PACIFIC NORTHWEST TONIGHT AS THE FIRST IN A
SERIES OF WAVES MOVES THROUGH THE AREA ALTHOUGH UNSETTLED WEATHER
SHOULD RETURN TUESDAY NIGHT IN ADVANCE OF THE NEXT SYSTEM TO
APPROACH THE AREA.
THE TAIL END OF A FRONT OVER THE WESTERN ATLANTIC IS CURRENTLY
ASSOCIATED WITH A LOT OF PRECIPITATION AS A STRONG AREA OF HIGH
PRESSURE OVER NEW ENGLAND HELPS TO STEER THE WINDS OFF THE
ATLANTIC INTO THE SOUTHEAST. CURRENTLY... THE MAJORITY OF THIS
PRECIPITATION IS OFFSHORE... WITH THE EDGES AFFECTING THE
SOUTHEAST COAST. THIS WILL REMAIN THE SAME INTO TUESDAY EVENING
BEFORE AN AREA OF LOW PRESSURE DEVELOPS ALONG THE FRONT. THIS LOW
IS CURRENTLY EXPECTED TO DRIFT CLOSER TO THE COAST BRINGING THE
THREAT FOR HEAVY RAIN TO THE EAST COAST FROM NEAR VIRGINIA BEACH
DOWN TO NEAR CHARLESTON BEGINNING TUESDAY NIGHT. A STRONG FETCH OF
NORTHEASTERLY WINDS IS ALSO EXPECTED ALONG THE EAST COAST AS A
TIGHT PRESSURE GRADIENT WILL SET UP BETWEEN THE HIGH PRESSURE AND
DEVELOPING LOW.
HIGH PRESSURE WILL DOMINATE THE WEATHER FROM THE SOUTHERN PLAINS
INTO THE NORTHEAST OVER THE NEXT COUPLE OF DAYS... WHICH WILL KEEP
TEMPERATURES CLOSE TO AVERAGE ALONG WITH MOSTLY SUNNY TO PARTLY
CLOUDY SKIES.
OTTO
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