833
FXUS01 KWBC 270828
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
427 AM EDT TUE OCT 27 2009
VALID 12Z TUE OCT 27 2009 - 00Z THU OCT 29 2009
A DYNAMIC SYSTEM MOVING THROUGH THE WESTERN U.S. WILL BE THE MOST
NOTEWORTHY WEATHER-MAKER AS HEAVY SNOW...HIGH WINDS...COLD
TEMPERATURES...AND A POTENTIAL FOR WILDFIRE ACTIVITY ARE ALL
POSSIBLE WITH THIS SYSTEM. AN UPPER TROUGH QUICKLY DROPPING
SOUTHWARD THROUGH THE CENTRAL GREAT BASIN WILL EVENTUALLY REACH
THE DESERT SOUTHWEST BY MIDDAY WEDNESDAY AND DEVELOP A CLOSED
UPPER LOW CENTER. AS THIS OCCURS...THE SYSTEM WILL SLOW IN FORWARD
SPEED AND HELP FOCUS A CONCENTRATED AXIS OF SNOWFALL ACROSS MANY
OF THE SAME LOCATIONS. FOR MUCH OF THE NEXT 48 HOURS...THE
PREVAILING SURFACE WINDS WILL GENERALLY FLOW FROM THE SOUTH AND
WILL DEVELOP UPSLOPE SNOWS ACROSS THE CENTRAL ROCKIES AND
STRETCHING NORTHWARD INTO THE LARAMIE MOUNTAINS OF SOUTHEASTERN
WYOMING. MUCH OF THE PRECIPITATION WITH THESE ANOMALOUSLY STRONG
WEATHER SYSTEM WILL BE IN THE FORM OF SNOW...WITH EXCEPTIONS ALONG
THE COAST AND LOWER ELEVATIONS OF THE DESERT SOUTHWEST.
THE OTHER ASPECT OF THIS WESTERN TROUGH IS THE EFFECTS ON THE
TEMPERATURE AND POTENTIAL FOR FIRE WEATHER. A FRONTAL BOUNDARY
CURRENTLY POSITIONED ACROSS THE NORTHERN ROCKIES AND STRETCHING
SOUTHWESTWARD BACK THROUGH THE WASATCH AND INTO CENTRAL CALIFORNIA
IS BRINGING QUITE THE CHANGE IN AIR MASS. TEMPERATURE FALLS OF A
MINIMUM OF 2O TO 25 DEGREES ARE A POSSIBILITY WITH A NOTICEABLE
FALL IN THE DEW POINT TEMPERATURES. AS STRONG AREAS OF LOW
PRESSURE DEVELOP ALONG THE BOUNDARY...THE RESULTANT PRESSURE
DIFFERENCE ACROSS THE REGION WILL SIGNIFICANTLY ENHANCE THE WIND
FIELD WITH GUSTY WINDS IN EXCESS OF 30 MPH POSSIBLE. THE EFFECTS
OF THE DRY AND WINDY CONDITIONS IS EXPECTED TO ENHANCE THE
POTENTIAL FOR THE DEVELOPMENT OF WILDFIRES ACROSS THE SOUTHWESTERN
U.S. DURING THE NEXT COUPLE OF DAYS. FOR MORE DETAILS ON ALL
ASPECTS OF THIS SIGNIFICANT SYSTEM...PLEASE VISIT THE NATIONAL
WEATHER SERVICE HOMEPAGE AT WWW.WEATHER.GOV WHICH INCLUDES LOCAL
FORECASTS FOR YOUR AREA OF INTEREST.
AN UPPER TROUGH EMANATING FROM THE LONE STAR STATE HAS ALSO BEEN A
LARGE PRECIPITATION PRODUCER AS IT TAPS INTO THE GULF OF MEXICO
FOR ABUNDANT MOISTURE. THIS WILL HELP FUEL WIDESPREAD SHOWERS AND
THUNDERSTORMS OVER MUCH OF THE GULF COAST AND SOUTHEASTERN U.S.
ANOTHER AREA OF INTEREST IS ACROSS THE MID-ATLANTIC AND COASTAL
CAROLINAS WHERE A COASTAL LOW HAS HELPED SPREAD PRECIPITATION
ONSHORE WITH ITS EFFECTS SLOWING MOVING INTO THE NORTHEASTERN TIER
STATES. MEANWHILE...THE GULF SYSTEM IS FORECAST TO TRACK
NORTHEASTWARD INTO THE MID-ATLANTIC KEEPING CONDITIONS UNSETTLED
THROUGH WEDNESDAY ACROSS THE REGION. THE WEATHER SHOULD GRADUALLY
IMPROVE BY THURSDAY AS A SURFACE RIDGE BUILDS OVER THE EAST COAST.
RUBIN-OSTER
GRAPHIC AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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