SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
222 PM EST TUE NOV 24 2009
 
VALID 00Z WED NOV 25 2009 - 12Z THU NOV 26 2009
 
A COLD AND BLUSTERY THANKSGIVING DAY IS ON TAP FOR MUCH OF THE
GREAT LAKES REGION. A LARGE PIECE OF UPPER LEVEL ENERGY IS MAKING
ITS WAY THROUGH THE MIDDLE MISSISSIPPI VALLEY...PUSHING A HEAVY
AREA OF PRECIPITATION OUT AHEAD OF IT. THIS DEEPENING LOW PRESSURE
SYSTEM WILL SLOWLY TRACK NORTH NORTHEASTWARD...THROUGH THE GREAT
LAKES BY THURSDAY EVENING. THE MAIN AREA OF PRECIPITATION WILL
REMAIN NEAR THE LOW PRESSURE CENTER. TEMPERATURES WILL BE DROPPING
BY AS MUCH AS 10 DEGREES BEHIND THE COLD FRONT. 

A SECONDARY COLD FRONT...BRINGING ARCTIC AIR FROM NORTHERN CANADA
TO THE GREAT PLAINS AND MIDWEST... WILL FORM BEHIND THE CURRENT
FRONTAL SYSTEM WEDNESDAY NIGHT. AS THE FIRST FRONT WEAKENS ANOTHER
BURST OF UPPER LEVEL ENERGY PUSHES THROUGH IN THE WAKE OF THE
ORIGINAL SURGE. AS THE SECOND COLD FRONT GAINS MOMENTUM IT WILL
DISLODGE THE STATIONARY FRONT THAT IS CURRENTLY SITUATED OVER
FLORIDA...FINALLY MOVING THE BULK OF THE WET WEATHER OUT OF THE
AREA FOR SHOPPERS GETTING UP EARLY ON FRIDAY TO HIT THOSE BLACK
FRIDAY SALES. 

PRECIPITATION OVER THE NORTHWEST WILL BE MAINLY CONFINED TO THE
NORTHERN TIER OF THE UPPER NORTHWEST AND ALONG A STATIONARY
BOUNDARY SITUATED ALONG THE ROCKIES. RAIN AND SNOW FALLING IN THIS
REGION WILL BE LIGHT AND SHOWERY IN NATURE. THE DOME OF HIGH
PRESSURE SITUATED OVER THE SOUTHWEST WILL KEEP THE RAIN AND SNOW
TO THE NORTH...ENSURING RESIDENTS IN THIS AREA OF THE COUNTRY
ENJOY A SUNNY AND RELATIVELY WARM THANKSGIVING DAY.

COLLINS
 

GRAPHIC AVAILABLE AT WWW.HPC.NCEP.NOAA.GOV