635
FXUS01 KWBC 082101
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
500 PM EDT WED OCT 08 2008
VALID 00Z THU OCT 09 2008 - 12Z FRI OCT 10 2008
A SIGNIFICANT UPPER-LEVEL TROUGH EMANATING FROM THE GULF OF ALASKA
WILL BRING A TREMENDOUS SURGE OF COLD AIR TO THE WESTERN TIER
THROUGHOUT THE NEXT SEVERAL DAYS. NOTICEABLE DIFFERENCES IN THE
DAILY TEMPERATURES WILL HIT THE REGION...ESPECIALLY ACROSS THE
UPPER INTERMOUNTAIN WEST WHERE LOWS THE NEXT COUPLE OF NIGHTS WILL
DIVE INTO THE LOW TO MID 20S. AS A SURFACE FRONTAL BOUNDARY
PUNCHES THROUGH THE HIGHER TERRAIN AND INTO THE DESERT
SOUTHWEST...TEMPERATURE FALLS IN EXCESS OF 30 TO 35 DEGREES WILL
BE COMMONPLACE BRINGING A WINTER LIKE FEEL TO THE AIR. IN
ADDITION...THE SURFACE WINDS WILL PICK UP IN STRENGTH AS THE
PRESSURES QUICKLY LOWER OVER THE INTERIOR WEST. THE GUSTY WINDS
COMBINED WITH LOW RELATIVE HUMIDITIES HAS WARRANTED NUMEROUS
FORECAST OFFICES ACROSS NORTHERN AND CENTRAL CALIFORNIA TO PLACE
FIRE WEATHER WATCHES OUT IN ANTICIPATION OF THE POSSIBLE FIRE
DANGER.
ACCOMPANYING THE ANOMALOUSLY COLD TEMPERATURES WILL BE WIDESPREAD
SNOWFALL WHICH WILL BLANKET THE HIGHER TERRAIN OF THE PACIFIC
NORTHWEST..UPPER INTERMOUNTAIN WEST...ALONG WITH THE NORTHERN
ROCKIES. THE BEST FOCUS FOR HIGHER AMOUNTS OF SNOWFALL WILL RESIDE
ACROSS NORTHERN WYOMING STRETCHING NORTHWARD INTO MUCH OF SOUTHERN
MONTANA. TO GET MORE DETAILED INFORMATION ON THE SNOWFALL THREAT
ACROSS THE WEST...PLEASE VISIT THE HPC WINTER WEATHER FORECAST AT
WWW.HPC.NCEP.NOAA.GOV/WWD/WINTER_WX.SHTML. FARTHER TO THE
EAST...WHILE COOLER AIR WILL FILTER IN ACROSS THE NORTHERN
PLAINS...TEMPERATURES WILL REMAIN WELL ABOVE FREEZING RESULTING IN
LIGHT TO MODERATE RAINFALL ACROSS THE AREA BY THURSDAY EVENING.
SOGGY CONDITIONS WILL CONTINUE ACROSS THE SOUTHEASTERN U.S. INTO
THE UPCOMING WEEKEND. AN UPPER-LEVEL DISTURBANCE CURRENTLY MOVING
THROUGH THE CENTRAL GULF COAST WILL SLOW IN FORWARD PROGRESS OVER
THE NEXT 24 TO 48 HOURS WHICH WILL ALSO ALLOW THE FRONTAL BOUNDARY
CROSSING TO REGION TO BECOME NEARLY QUASI-STATIONARY.
CONSEQUENTLY...THIS REGION CAN EXPECT DISTURBED WEATHER IN THE
FORM OF WIDESPREAD SHOWERS AND THUNDERSTORMS...ESPECIALLY IN CLOSE
PROXIMITY TO THE UPPER-LEVEL LOW CENTER. DESPITE THE PRECIPITATION
EXPECTED...MUCH OF THE SOUTHEAST IS FORECAST TO SEE HIGHS INTO THE
LOWER 80S AS MILD AIR STREAMS IN OFF THE WARMER NEARBY BODIES OF
WATER.
A WARMING TREND IS IN STORE ACROSS THE GREAT LAKES AND OHIO VALLEY
AS A RIDGE WILL BEING TO STRENGTHEN OVER THE REGION BY FRIDAY. AS
THE UPPER TROUGH IN THE WEST CONTINUES TO AMPLIFY...SO WILL THE
RIDGE...ALLOWING SIGNIFICANT WARMTH TO STRETCH WELL UP INTO THE
GREAT LAKES. BY FRIDAY...MID TO UPPER 70S WILL COVER THE OHIO
RIVER VALLEY WITH EVEN SOME LOCATIONS HITTING THE 80 DEGREE MARK
BY THE WEEKEND.
RUBIN-OSTER
GRAPHICS AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV
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