Re: DC TV 15"-25"
Posted by JAC on 12/18/2009, 8:05 pm
 MESOSCALE DISCUSSION 2258 NWS STORM PREDICTION CENTER NORMAN OK 0622 PM CST FRI DEC 18 2009 AREAS AFFECTED...PORTIONS OF THE CNTRL/SRN APPALACHIANS AND LOWER MID-ATLANTIC CONCERNING...HEAVY SNOW VALID 190022Z - 190515Z HEAVY SNOW WITH RATES OF 1 TO 2 IN/HR WILL GRADUALLY TRANSLATE E/NEWD THROUGH 06Z...TOWARDS THE I-95 CORRIDOR FROM THE WASHINGTON D.C. TO RICHMOND METRO AREAS. LOCALIZED CONVECTIVE BURSTS MAY YIELD RATES UP TO 3 IN/HR. A NARROW TRANSITIONAL CORRIDOR OF SLEET TO FREEZING RAIN MAY DEVELOP ACROSS PORTIONS OF THE PIEDMONT IN WRN NC TO S-CNTRL VA. AS OF 0015Z...A BROAD SWATH OF MODERATE TO HEAVY SNOW PERSISTED FROM PORTIONS OF THE CNTRL/SRN APPALACHIANS INTO THE PIEDMONT OF WRN NC AND CNTRL/SRN VA. MULTIPLE HOURS OF SNOWFALL RATES FROM 1 TO 2 IN/HR HAVE BEEN REPORTED SINCE 21Z ACROSS FAR ERN TN/KY...WRN NC AND SWRN VA. LATEST MODEL FORECASTS ARE CONSISTENT WITH WEAKENING THE LEAD SHORT WAVE TROUGH...WHICH EXTENDED FROM ERN TN/KY SWD INTO GA PER WATER VAPOR IMAGERY. NEVERTHELESS...UPSTREAM SHORT WAVE TROUGH OVER THE MID-MS VALLEY AND ASSOCIATED MID-LEVEL JET ARE EXPECTED TO AMPLIFY AS THEY EJECT EWD ACROSS THE TN VALLEY. THIS WILL MAINTAIN GRADUAL DEEPENING OF SURFACE CYCLONE ALONG COASTAL SC THROUGH 06Z. STRONG LOW-LEVEL WAA...INFERRED BY LARGE VEERED HODOGRAPHS IN REGIONAL VWP DATA...SHOULD CONTINUE AS 18Z NAM/21Z RUC FORECASTS DEPICT INTENSE LOW/MID-LEVEL ISENTROPIC/FRONTOGENETICAL ASCENT GRADUALLY PIVOTING EWD TO THE N/NW OF THE SURFACE LOW TRACK. THIS WILL SUPPORT SNOWFALL RATES OF 1 TO 2 IN/HR PERSISTING...WHILE THE STRENGTH OF THE WAA MAY RESULT IN A NARROW CORRIDOR OF SLEET TO FREEZING RAIN ACROSS PORTIONS OF WRN NC INTO S-CNTRL VA. ..GRAMS.. 12/19/2009 |
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In this thread:
Traffic Info Site & Watches / Warnings - JAC, 12/18/2009, 4:01 pm
- Looks like Surface Low is slowing down some - JAC, 12/19/2009, 10:48 am
- Re: Traffic Info Site & Watches / Warnings - JAC, 12/18/2009, 5:33 pm
- DC TV 15"-25" - JAC, 12/18/2009, 5:19 pm
- Blizzard Warning - JAC, 12/19/2009, 10:34 am
- Thunder snow possible - JAC, 12/18/2009, 5:26 pm
- Latest SREF looks a whole lot worse - JAC, 12/18/2009, 4:44 pm
- VA Gov just declared state of emergency. - aquaRN, 12/18/2009, 4:29 pm
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