DC to Philly Under-the-Gun
Posted by JAC on 12/18/2009, 7:59 am
SHORT RANGE FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
400 AM EST FRI DEC 18 2009

VALID 12Z FRI DEC 18 2009 - 00Z SUN DEC 20 2009

THE BIGGEST WEATHER STORY ACROSS THE LOWER 48 WILL BE WITH A STORM
SYSTEM CURRENTLY LOCATED IN THE GULF OF MEXICO. THE INTERACTION
BETWEEN AN UPPER LEVEL TROUGH CURRENTLY OVER THE NORTHWEST GULF
AND A DEEPENING UPPER LEVEL TROUGH OVER THE PLAINS WILL DICTATE
EXACTLY WHERE THE SURFACE LOW OVER THE GULF TRACKS AS IT WORKS ITS
WAY UP THE EAST COAST TODAY AND SATURDAY WHICH WILL ALSO IMPACT
SNOWFALL TOTALS. THE CURRENT THINKING AT HPC IS FOR THE LOW TO
CONTINUE DEEPENING AS IT TRACKS ACROSS THE SOUTHEAST TODAY... TO
ALONG THE OUTER BANKS OF NORTH CAROLINA BY SATURDAY MORNING AND
SOUTHEAST OF MARTHAS VINEYARD ON SUNDAY MORNING. THIS TRACK GIVES
A STRIPE OF HEAVY SNOWFALL FROM WESTERN NORTH CAROLINA TO NEW YORK
CITY IMPACTING MAJOR CITIES IN BETWEEN INCLUDING WASHINGTON
D.C.... BALTIMORE AND PHILADELPHIA WITH POTENTIALLY A FOOT OR MORE
OF SNOW. STRONG WINDS ARE ALSO EXPECTED FROM THE EAST JUST NORTH
OF THE SURFACE LOW WHICH WILL IMPACT COASTAL REGIONS WITH THE
POTENTIAL FOR BEACH EROSION. HEAVY RAIN IS ANTICIPATED TO IMPACT
REGIONS SOUTHEAST OF THE RAIN/SNOW LINE WITH A SLEET/FREEZING RAIN
MIX NEAR THE TRANSITION ALONG THE PIEDMONT OF NORTH CAROLINA INTO
VIRGINIA. AS THE STORM WRAPS UP... VERY COLD AIR WILL GET PULLED
DOWN AFFECTING THE ENTIRE EASTERN PORTION OF THE LOWER 48 WITH
BELOW AVERAGE TEMPERATURES.

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Very Unstable Air pushing up from the GOM, Tornado Watch for South FL - JAC, 12/18/2009, 7:43 am
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