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- Severe threat shifting east - a bumpy day ahead - JAC, 12/18/2009, 11:39 am
- Up to 18" in VA - JAC, 12/18/2009, 11:07 am
- A bowing squall line forming in SW FL - JAC, 12/18/2009, 10:49 am
- Torando Warning Dade County - JAC, 12/18/2009, 9:57 am
- Cap lifting for S FL, Unstable Air filling in - JAC, 12/18/2009, 9:45 am
- Severe weather could ride up the coast - JAC, 12/18/2009, 8:43 am
- Rex Block continuing to funnel cold air from NW Canada - JAC, 12/18/2009, 8:12 am
- GFS & CMC forecasts transition to warm-core over Gulf Stream - JAC, 12/18/2009, 8:06 am
- DC to Philly Under-the-Gun - JAC, 12/18/2009, 7:59 am
- any idea which area might get the worst? - BobbiStorm, 12/18/2009, 7:50 am
- Heavy Snow along Smokies and Norfh into W VA & VA - JAC, 12/18/2009, 7:48 am
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