006
FXUS01 KWBC 192011
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
410 PM EDT FRI SEP 19 2008
VALID 00Z SAT SEP 20 2008 - 12Z SUN SEP 21 2008
FROM THE SOUTHERN TO CENTRAL MISSISSIPPI VALLEY... A NARROW AREA
OF SOUTHERLY WINDS IN THE LOWER LEVELS OF THE ATMOSPHERE WILL HELP
TO TRANSPORT ADDITIONAL MOISTURE FROM THE GULF OF MEXICO INTO THE
LOWER MISSISSIPPI VALLEY AHEAD OF A SLOWLY MOVING... WEAK UPPER
LEVEL DISTURBANCE. ONGOING SHOWERS AND THUNDERSTORMS ACROSS THIS
REGION ARE EXPECTED TO CONTINUE THROUGH THE WEEKEND... AND ONLY
SLOWLY MOVE EASTWARD BY SUNDAY. THE HEAVIEST RAINFALL TOTALS ARE
FORECAST OVER EXTREME SOUTHERN MISSISSIPPI INTO SOUTHEASTERN
LOUISIANA WHERE THE GREATEST AMOUNT OF MOISTURE WILL EXIST.
FARTHER NORTH... A STRONG COLD FRONT WILL CONTINUE MOVING THROUGH
THE NORTHERN PLAINS TONIGHT... BRINGING AN END TO THE ANOMALOUS
WARMTH THIS AREA HAS BEEN EXPERIENCING OVER THE PAST FEW DAYS.
HOWEVER... BY SATURDAY AFTERNOON... THE FRONT IS EXPECTED TO
BECOME STATIONARY FROM SOUTHEASTERN SOUTH DAKOTA INTO ALBERTA...
PROLONGING THE WARMTH TO THE SOUTH OF THE BOUNDARY A WHILE LONGER.
TO THE EAST... THE COLD FRONT WILL CONTINUE TO MOVE SOUTHEAST...
REACHING NEW ENGLAND BY SUNDAY MORNING. A VERY STRONG LOW LEVEL
JET WILL TRANSPORT MOISTURE AHEAD OF THE FRONT GENERATING A NARROW
AXIS OF SHOWERS NEAR THE FRONT... MAINLY OVER QUEBEC. ACROSS THE
CENTRAL GREAT LAKES REGION... RAINFALL TOTALS ARE EXPECTED TO BE
LIGHT.
WITH A RIDGE OF HIGH PRESSURE FORECAST TO REMAIN EXTENDED DOWN
FROM NEW ENGLAND TO THE MID ATLANTIC REGION... AREAS FROM THE OHIO
VALLEY... EASTWARD TO THE COAST AND INTO THE NORTHEAST SHOULD
REMAIN RAIN FREE THROUGH THE WEEKEND ALONG WITH AVERAGE TO BELOW
AVERAGE TEMPERATURES. AS AN AREA OF LOW PRESSURE SLOWLY MOVES
NORTH ALONG AN OLD FRONTAL BOUNDARY IN THE WESTERN ATLANTIC... IT
WILL INTERACT WITH THE AREA OF HIGH PRESSURE TO ITS NORTH...
CONTINUING TO GENERATE NORTHEASTERLY WINDS OF 20 TO 30 MPH ALONG
THE MID ATLANTIC COAST INTO THE DAY TOMORROW. THE WINDS ARE
EXPECTED TO LESSEN BY SUNDAY AS AN ADVANCING COLD FRONT REDUCES
THE PRESSURE GRADIENT.
OUT WEST... AN UPPER LEVEL LOW WILL BRING A COLD FRONT THROUGH THE
INTERMOUNTAIN WEST TOMORROW AND SUNDAY... BRINGING COOLER WEATHER
TO THE REGION ALONG WITH SCATTERED SHOWERS AND THUNDERSTORMS.
UPSLOPE FLOW ACROSS THE HIGHER TERRAIN OF IDAHO AND WESTERN
MONTANA SHOULD PROMOTE THE HIGHEST RAINFALL TOTALS ACROSS THESE
AREAS THROUGH SUNDAY.
OTTO
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