975
FXUS01 KWBC 252035
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
435 PM EDT FRI SEP 25 2009
VALID 00Z SAT SEP 26 2009 - 12Z SUN SEP 27 2009
PRECIPITATION WILL BE ON THE INCREASE FOR THE EASTERN THIRD OF THE
COUNTRY AS THE LARGE UPPER LEVEL LOW OVER THE PLAINS BEGINS TO
EJECT OUT TOWARD THE EAST. THERE IS PLENTY OF AVAILABLE MOISTURE
OUT AHEAD OF THE PRIMARY COLD FRONT ASSOCIATED WITH THE UPPER LOW
WHICH WILL AID IN POTENTIALLY FLOODING RAINS... ESPECIALLY FOR THE
CENTRAL AND SOUTHERN APPALACHIANS WHERE INCREASING LOW LEVEL WINDS
WILL INTERACT WITH THE TOPOGRAPHY... LOCALLY ENHANCING RAINFALL
TOTALS.
IN ADDITION ACROSS THE EAST... A LARGE DOME OF HIGH PRESSURE OVER
NEW ENGLAND TONIGHT WILL ALLOW TEMPERATURES TO COOL TO THE COLDEST
OF THE SEASON THUS FAR. FREEZE WATCHES AND WARNINGS HAVE BEEN
POSTED FOR MUCH OF NEW ENGLAND INTO UPSTATE NEW YORK. CLOUDS WILL
BE ON THE INCREASE TOMORROW ACROSS THE NORTHEAST AS RAIN
APPROACHES FROM THE SOUTHWEST WITH EVENTUAL RAIN REACHING NEW
ENGLAND BY SUNDAY MORNING. MAX TEMPERATURES WILL BE BELOW AVERAGE
FOR THE MID ATLANTIC AND NORTHEAST TOMORROW... HOWEVER CLOUDS AND
RAIN WILL KEEP SATURDAY NIGHTS LOWS IN THE 40S AND 50S FOR THE
NORTHERN MID ATLANTIC INTO THE NORTHEAST.
THE OTHER BIG WEATHER FEATURE IMPACTING THE LOWER 48 DURING THE
SHORT RANGE PERIOD WILL BE CONNECTED TO AN INITIALLY FAST MOVING
UPPER LEVEL TROUGH MOVING THROUGH SOUTHWESTERN CANADA. A COLD
FRONT HAS ALREADY SIGNIFICANTLY COOLED PORTIONS OF THE NORTHERN
ROCKIES COMPARED TO THIS TIME YESTERDAY. AS THE WESTERN PORTION OF
THIS FRONT DISSIPATES... TEMPS WILL WARM AGAIN ON SATURDAY BEFORE
A SECOND SURGE OF COLDER AIR REACHES THE NORTH CENTRAL U.S.
TOMORROW EVENING AND DIVES THROUGH THE CENTRAL U.S. ON SUNDAY. THE
SURFACE LOW IS EXPECTED TO QUICKLY DEEPEN WHICH WILL LIKELY HELP
TO GENERATE GUSTY NORTHWESTERLY WINDS AFTER THE FRONT MOVES
THROUGH OVER THE NORTHERN U.S.
UPPER LEVEL RIDGING ACROSS THE WEST AND SOUTHWESTERN U.S. WILL
KEEP CONDITIONS RATHER QUIET WITH MUCH OF THE ACTIVE WEATHER BEING
EAST OF THE ROCKIES. WARM TO HOT TEMPERATURES WILL PREVAIL ACROSS
MUCH OF THE WEST THIS WEEKEND WITH THE DESERT SOUTHWEST AND THE
LOWER ELEVATIONS OF CALIFORNIA SEEING MAX TEMPERATURES IN THE
UPPER 90S TO 100S.
OTTO
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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