788
FXUS01 KWBC 060857
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
456 AM EDT TUE OCT 06 2009
VALID 12Z TUE OCT 06 2009 - 00Z THU OCT 08 2009
LOW PRESSURE ASSOCIATED WITH A STORM SYSTEM OVER THE CENTRAL U.S.
IS FORECAST TO INTENSIFY WHILE TRACKING TOWARD THE EAST OVER THE
NEXT COUPLE OF DAYS. TEMPERATURES OF TWENTY TO THIRTY DEGREES
BELOW AVERAGE HAVE INVADED THE NORTHERN ROCKIES AND NORTHERN HIGH
PLAINS BEHIND THE SYSTEMS COLD FRONT. HOWEVER... THE AIRMASS WILL
MODIFY AS IT MOVES ACROSS THE LOWER 48... SO BY THE TIME THE FRONT
CLEARS THE EAST COAST... THESE DRAMATIC TEMPERATURE DEPARTURES ARE
NOT EXPECTED. STEADY RAIN IS EXPECTED TO CONTINUE TRACKING TO THE
EAST NORTHEAST IMPACTING LOCATIONS FROM THE GREAT LAKES INTO NEW
ENGLAND WITH A STEADY DOSE OF RAINFALL THROUGH WEDNESDAY. THE
PRESENCE OF GREATER LOW LEVEL MOISTURE TO THE SOUTH AND SUFFICIENT
JET SUPPORT ALOFT WILL ALLOW FOR THUNDERSTORM DEVELOPMENT NEAR THE
FRONT... SOME OF WHICH COULD BE SEVERE TODAY FROM TEXAS INTO THE
TENNESSEE VALLEY. THESE STORMS SHOULD WEAKEN OVERNIGHT AND BY
WEDNESDAY MORNING... ONLY SCATTERED STORMS ARE EXPECTED ACROSS THE
SOUTH NEAR THE FRONTAL BOUNDARY.
HIGH PRESSURE WILL BUILD EASTWARD FROM THE PLAINS BEHIND THIS
FRONT... BRINGING CLEARING SKIES WITH IT. AS THE HIGH MOVES EAST
OF THE MISSISSIPPI... SOUTHERLY FLOW WILL RETURN AGAIN ACROSS THE
PLAINS ALLOWING HIGHS TO REACH BACK INTO THE 70S ON WEDNESDAY AS
FAR NORTH AS NEBRASKA AND IOWA. THE WARMTH WILL BE SHORT LIVED
THOUGH... AS A STRONG SURGE OF COLD CANADIAN AIR REACHES THE NORTH
CENTRAL U.S. LATE WEDNESDAY.
SOUTH TEXAS WILL REMAIN HOT IN LOCATIONS AHEAD OF THE FIRST COLD
FRONT AS THE BOUNDARY STRUGGLES TO MAKE IT MUCH PAST HOUSTON OR
SAN ANTONIO. SOUTHWESTERLY FLOW ALOFT AHEAD OF AN APPROACHING
UPPER LEVEL LOW FROM THE SOUTHWEST WILL LIKELY KEEP THE SOUTHERN
HIGH PLAINS ACTIVE WITH CONVECTION AS UPPER LEVEL IMPULSES TRAVEL
THROUGH THE REGION... BEGINNING DURING THE DAY ON WEDNESDAY.
OTTO
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