[MCD] SWOMCD

Fri Dec 9 05:57:23 UTC 2005

ACUS11 KWNS 090554
SWOMCD
SPC MCD 090554 
NYZ000-CTZ000-NJZ000-PAZ000-DEZ000-MDZ000-VAZ000-DCZ000-WVZ000-NCZ000-091200-

MESOSCALE DISCUSSION 2550
NWS STORM PREDICTION CENTER NORMAN OK
1154 PM CST THU DEC 08 2005

AREAS AFFECTED...SRN NY..WRN/CENTRAL PA...MD...WV AND VA AND NRN NC

CONCERNING...WINTER MIXED PRECIPITATION 

VALID 090554Z - 091200Z

SIGNIFICANT WINTER STORM WILL MOVE INTO THE MID ATLANTIC REGION
OVERNIGHT. THREAT FOR HEAVY SNOW WILL DEVELOP NEWD ACROSS
CENTRAL/ERN PA...FAR SRN NY...NJ AND WRN/NRN MD THROUGH 12Z. A MIX
OF SLEET AND FREEZING RAIN WILL OCCUR SOUTH OF THIS REGION ACROSS
PORTIONS OF NRN NC...MUCH OF CENTRAL/NRN VA...SRN/CENTRAL MD AND DE.
SNOWFALL RATES FROM 1-2 IN PER HOUR WILL BE MOST LIKELY OVER
ERN/CENTRAL PA AND NRN MD WITH THE GREATEST SLEET/FREEZING RAIN
RATES UP TO 0.10 IN/HR IN A CORRIDOR FROM SWRN VA INTO THE DC METRO
AREA/ERN MD BETWEEN 08-12Z.

LATEST RADAR IMAGERY SHOWS AN EXTENSIVE AREA OF PRECIPITATION AHEAD
OF A POWERFUL UPPER SYSTEM OVER THE OHIO VALLEY. STRONG MID LEVEL
WARM ADVECTION/ISENTROPIC LIFT WILL CONTINUE TO CONTRIBUTE TO AN
EXPANDING AREA OF PRECIPITATION OVER THE CENTRAL APPALACHIANS
TOWARDS THE HUDSON RIVER VALLEY BY 12Z. STRONG ASCENT IN A
THERMODYNAMIC PROFILE SUPPORTING DENDRITE SNOW GROWTH WILL SUPPORT
HEAVY SNOWFALL WITH HRLY SNOWFALL RATES FROM 1-2 IN/HR ACROSS MUCH
OF CENTRAL/ERN PA...WRN AND NRN MD INTO NJ/SRN NY THROUGH 12Z.

FURTHER SOUTH STRONG LOW LEVEL WARM ADVECTION AHEAD OF A COLD FRONT
WAS AIDING IN MODERATE PRECIPITATION ACROSS THE SRN
APPALACHIANS...THAT WILL CONTINUE TO LIFT NEWD INTO THE
MID-ATLANTIC. CURRENT WET BULB FREEZING LINE EXTENDING FROM THE SRN
DELMARVA PENINSULA SWD INTO THE PIEDMONT REGION OF NC/SC WILL
CONTINUE TO GRADUALLY SHIFT NWD THROUGH THE OVERNIGHT HOURS AS
MODERATE PRESSURE FALLS WILL SUPPORT SELY LOW LEVEL FLOW. ELEVATED
WARM LAYER WILL BE SUFFICIENTLY DEEP TO CONTINUE TO SUPPORT FREEZING
RAIN OVER MUCH OF THE PIEDMONT REGION OF NC THROUGH 09Z...WHILE
CONTINUING TO DEVELOP ACROSS MUCH OF SCENTRAL INTO ECENTRAL VA AND
SRN MD THROUGH 12Z. NORTH OF THIS REGION...THERE WILL LIKELY
CONTINUE TO BE A NARROW CORRIDOR OF ELEVATED WARM NOSE BETWEEN
850-800 MB THAT WILL SUPPORT A MIX OF SLEET WITH THE FREEZING RAIN
FROM WCENTRAL/NRN VA INTO THE DC METRO AREA AND MUCH OF DE.

..CROSBIE.. 12/09/2005

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...OKX...ALY...PHI...BGM...AKQ...BUF...CTP...LWX...RAH...RNK...GSP...

40697331 41667354 42107417 42377608 42227785 41337853
39257856 37777955 37138063 36208113 35848040 36797808
37837659 39067461 

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