950
FXUS01 KWBC 162036
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
436 PM EDT TUE SEP 16 2008
VALID 00Z WED SEP 17 2008 - 12Z THU SEP 18 2008
THE WEATHER ACROSS THE UNITED STATES WILL BE FAIRLY TRANQUIL FOR
THE MIDDLE OF SEPTEMBER WITH MUCH OF THE UPPER-LEVEL ENERGY
REMAINING NORTH OF THE U.S./CANADIAN BORDER. THE PRIMARY EXCEPTION
WILL BE ACROSS THE CAROLINAS SOUTHWARD THROUGH THE SOUTHEASTERN
U.S. WHERE SHOWERS AND THUNDERSTORMS WILL REMAIN IN THE FORECAST
THROUGH THURSDAY. A FRONTAL BOUNDARY IS EXPECTED TO STALL ALONG
THIS REGION WHICH WILL HELP KEEP CONDITIONS UNSETTLED UNTIL THE
BOUNDARY LATER MOVES OFFSHORE BY THURSDAY EVENING.
ELSEWHERE...ISOLATED SHOWERS AND THUNDERSTORMS MAY FIRE ACROSS
PORTIONS OF THE DESERT SOUTHWEST AS SEVERAL WEAK WAVES WILL MOVE
THROUGH CALIFORNIA. MUCH OF THE CONVECTIVE ACTIVITY SHOULD BE
RESTRICTED TO THE AFTERNOON AND EVENING HOURS WITH A FOCUS ALONG
THE HIGHER TERRAIN WHERE TOPOGRAPHY WILL AID IN THE THUNDERSTORM
DEVELOPMENT.
AS LARGE-SCALE TROUGHING WILL REMAIN IN PLACE ACROSS THE EASTERN
HALF OF THE U.S...CONDITIONS WILL BE SEASONABLY COOL AS A COLD
FRONT WILL MOVE THROUGH THE UPPER MIDWEST AND MIDDLE MISSISSIPPI
VALLEY DURING THE NEXT COUPLE OF DAYS BRINGING A REINFORCEMENT OF
THE MORE AUTUMN-LIKE AIR MASS. THE FRONTAL PASSAGE WILL BE A DRY
ONE ACROSS MOST OF THE NORTHERN TIER...WHILE LIGHT RAIN SHOWERS
WILL FALL MAINLY NORTH OF THE BORDER. AS THE SYSTEM MOVES INTO THE
NORTHEASTERN QUADRANT OF THE NATION BY WEDNESDAY EVENING...LIGHT
RAIN CANNOT BE RULED OUT ACROSS AN AREA SPANNING FROM NEW YORK TO
MAINE.
ACROSS THE PACIFIC NORTHWEST...AN UPPER-LEVEL RIDGE WILL BRING
NEAR RECORD HEAT TO EASTERN WASHINGTON AND EASTERN OREGON DURING
THE NEXT COUPLE OF DAYS. TEMPERATURES PUSHING INTO THE LOWER 90S
ON WEDNESDAY WILL BE COMMONPLACE ALONG WITH ANOMALOUSLY DRY AIR.
CONSEQUENTLY...RED FLAG WARNINGS ARE IN EFFECT ACROSS MUCH OF THE
AREA WITH THE ENHANCED POSSIBILITY OF WILDFIRE DEVELOPMENT.
RUBIN-OSTER
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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