SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
229 PM EST SAT NOV 07 2009
 
VALID 00Z SUN NOV 08 2009 - 12Z MON NOV 09 2009
 
ONSHORE FLOW AHEAD OF THE NEXT STORM SYSTEM WILL PRODUCE SCATTERED
LIGHT RAIN AND HIGHER ELEVATION SNOW ACROSS PORTIONS OF THE
PACIFIC NORTHWEST AND THE NORTHERN INTERMOUNTAIN REGION THROUGH
SUNDAY.  BY SUNDAY EVENING ... THE APPROACHING FRONTAL SYSTEM WILL
AID IN CONTINUING THE LIGHT RAIN AND THE HIGHER ELEVATION SNOW
OVER PORTIONS OF THE PACIFIC NORTHWEST.  

MEANWHILE ... A FRONT EXTENDING FROM THE GREAT LAKES SOUTHWESTWARD
TO THE CENTRAL ROCKIES WILL DEVELOP A WAVE OF LOW PRESSURE THAT
WILL ADVANCE ALONG THE BOUNDARY FROM THE CENTRAL HIGH PLAINS TO
THE GREAT LAKES BY MONDAY.  THE SYSTEM WILL HAVE VERY LITTLE
MOISTURE TO WORK WITH THROUGH SUNDAY EVENING WHEN FLOW OFF THE
WESTERN GULF COAST WILL POOL MORE MOISTURE ALONG THE BOUNDARY. 
WITH THE ADDITIONAL MOISTURE ... SCATTERED LIGHT SHOWERS AND
EMBEDDED THUNDERSTORMS WILL FORM OVER PARTS OF THE UPPER MIDWEST
AND CENTRAL PLAINS.  THE WAVE OF LOW PRESSURE WILL BRING ABOVE TO
MUCH ABOVE AVERAGE TEMPERATURES TO THE MIDDLE MISSISSIPPI VALLEY
TO THE UPPER GREAT LAKES. 

UPPER LEVEL ENERGY OVER NORTHERN MEXICO IN COMBINATION WITH
MOISTURE FLOWING NORTHWARD OFF THE GULF OF MEXICO WILL TRIGGER
SHOWERS AND THUNDERSTORMS OVER THE WESTERN AND CENTRAL GULF COAST
STARTING SUNDAY MORNING GOING THROUGH MONDAY.     

ZIEGENFELDER


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