251
FXUS01 KWBC 190801
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
400 AM EDT MON OCT 19 2009
VALID 12Z MON OCT 19 2009 - 00Z WED OCT 21 2009
AS ONE AREA OF LOW PRESSURE MOVES FURTHER OFFSHORE OUT INTO THE
NORTHERN ATLANTIC...BRINGING AN END TO THE WET WEATHER IN THE
EAST...ANOTHER WILL BEGIN TO IMPACT THE WESTERN U.S. IN BETWEEN
THESE TWO WEATHER SYSTEMS...A LARGE AREA HIGH PRESSURE WILL
PROMOTE FAIR CONDITIONS ACROSS THE CENTRAL INTO THE EASTERN U.S.
HOWEVER...BY TUESDAY MORNING...CONDITIONS ARE FORECAST TO
DETERIORATE ACROSS THE NORTHERN PLAINS AND UPPER MIDWEST AS
MOISTURE FROM THE SOUTH MOVES ACROSS A FRONTAL BOUNDARY STALLING
SOUTH OF THE REGION.
CURRENTLY...THE LAST IN A SERIES OF SURFACE CYCLONES IMPACTING THE
NORTHEASTERN U.S. IS MOVING OFF OF THE NEW ENGLAND COAST WITH THE
LAST OF THE LIGHT RAIN AND HIGHER ELEVATION SNOWS EXPECTED TO END
LATER TODAY. IN THE WAKE OF THIS SYSTEM...AN EXPANSIVE AREA OF
SURFACE HIGH PRESSURE WILL DROP INTO THE EASTERN THIRD OF THE U.S.
PROMOTING DRIER WEATHER FOR THE EARLY PART OF THE WORK WEEK. IT
WILL ALSO SUPPORT ANOMALOUSLY COOL OVERNIGHT TEMPERATURES OVER
PORTIONS OF THE OHIO AND TENNESSEE VALLEYS...SOUTHEAST AND
SOUTHERN MID ATLANTIC STATES...WHICH MAY BRING THE GROWING SEASON
TO A CLOSE.
FURTHER TO THE WEST...A STRONG UPPER LEVEL DISTURBANCE IS FORECAST
TO DROP SOUTHEASTWARD ACROSS NORTHERN CALIFORNIA AND THE CENTRAL
GREAT BASIN INTO THE DESERT SOUTHWEST LATE TONIGHT INTO TUESDAY.
LIGHT TO MODERATE RAIN SHOWERS ARE FORECAST ACROSS PORTIONS OF THE
NORTHERN CALIFORNIA THROUGH THE CENTRAL AND NORTHERN GREAT BASIN
AND INTO THE ROCKIES TODAY. AS THE SYSTEM SWINGS ACROSS THE
INTERMOUNTAIN WEST...INCREASING SOUTHERLY WINDS DOWNSTREAM ARE
FORECAST TO PULL MOISTURE UP THROUGH THE PLAINS PROMOTING THE
INCREASING CHANCE FOR RAIN ACROSS THE NORTHERN AND CENTRAL PLAINS
INTO THE UPPER MIDWEST BEGINNING LATER TODAY. AS THE UPPER
SYSTEM'S ASSOCIATED COLD FRONT BEGINS TO EMERGE OUT INTO THE
SOUTHERN PLAINS LATE TUESDAY...SOME ORGANIZED SHOWERS AND
THUNDERSTORMS MAY BEGIN TO DEVELOP ACROSS THAT REGION.
PEREIRA
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