Mt Holly finally put out their afternoon disco....
.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
WINTER STORM
WARNING AND WINTER WEATHER ADVISORIES HAVE BEEN
ISSUED FOR PORTIONS OF THE AREA.
AS THE FIRST STRONG
LOW PRESSURE SYSTEM CONTINUES TO PULL AWAY FROM
THE AREA TONIGHT, ANOTHER IS EXPECTED TO DEVELOP AND STRENGTHEN OFF
THE COAST TONIGHT, WHICH WILL HELP LEAD TO AN ACCUMULATING SNOWFALL.
AN AREA OF LOW PRESSURE IS CURRENTLY LOCATED ACROSS THE EASTERN
GREAT LAKES REGION, WITH A FRONTAL BOUNDARY EXTENDING SOUTH TOWARD
THE GULF COAST. AN AREA OF LOW PRESSURE IS EXPECTED TO DEVELOP ALONG
THIS BOUNDARY OVERNIGHT, BEFORE MOVING OFFSHORE TOWARD DAYBREAK. THE
FRONT WILL WEAKEN AND STRETCH OUT INTO MORE OF A SURFACE
TROUGH
OVERNIGHT. MEANWHILE, A COUPLE OF SHORT WAVE/
VORTICITY IMPULSES WILL
SLIDE ACROSS THE AREA WITHIN THE SOUTHWEST
FLOW. THE ASSOCIATED LIFT
FROM THE SURFACE
TROUGH AND
VORTICITY IMPULSES, COMBINED WITH
INCREASING
MOISTURE IN THE
DENDRITIC ZONE WILL LEAD TO DEVELOPING
SNOWFALL THIS EVENING AND OVERNIGHT. THE HEAVIEST SNOWFALL IS
EXPECTED TO BE ACROSS SOUTHEASTERN PENNSYLVANIA, SOUTHERN NEW
JERSEY, AS WELL AS NORTHERN AND CENTRAL DELMARVA WHERE 1 TO 3 INCHES
COULD FALL THROUGH DAYBREAK.
&&
.SHORT TERM /6 AM TUESDAY MORNING THROUGH 6 PM TUESDAY/...
SNOW IS EXPECTED TO BE ONGOING AT THE START OF TUESDAY AS THE
SURFACE
TROUGH WILL REMAIN IN PLACE ACROSS OUR AREA AS THE COASTAL
LOW CONTINUES TO LIFT TO THE NORTHEAST. THE COMBINED LIFT FROM THE
SURFACE
TROUGH, ALONG WITH A STRONGER
VORTICITY IMPULSE EXPECTED
DURING THE DAY, WILL CONTINUE TO COMBINE WITH ENHANCED
MOISTURE IN
THE
DENDRITIC ZONE AND IS EXPECTED TO LEAD TO A PERIOD OF ENHANCED
SNOWFALL DURING THE DAY ACROSS THE AREA. IT MAY NOT SNOW THE
ENTIRE TIME DURING THE DAY TUESDAY, BUT WHEN IT DOES SNOW, THERE
COULD BE A FEW HEAVIER PERIODS. AN ADDITIONAL 1 TO 3 INCHES COULD
FALL ACROSS PORTIONS OF THE AREA. ACROSS THE SOUTHERN AREAS,
SNOWFALL COLD CHANGE OVER AND/OR MIX WITH RAIN AT TIMES DURING THE
DAY WHICH WOULD LIMIT THEIR ACCUMULATIONS DURING THE DAY.
&&
.LONG TERM /TUESDAY NIGHT THROUGH MONDAY/...
A DEEP UPPER
TROF/LOW WILL MOVE SLOWLY EASTWARD FROM THE MIDWEST
ACROSS THE NORTHEAST AND MID ATLANTIC REGIONS OVER THE NEXT 2-3
DAYS. THIS WILL RESULT IN PERIODS OF SNOW ACROSS THE FORECAST AREA
FOR MUCH OF THIS TIME. THE SNOW EVENT WILL BE IN PROGRESS OVER THE
AREA AT THE BEGINNING OF THIS EXTENDED PERIOD...TUES EVE...
ALTHO
IT LOOKS LIKE THE MAJORITY OF THE SNOW MAY HAVE ALREADY FALLEN BY
THAT TIME. THIS UPPER
SYS IS FAIRLY COMPLEX WITH A NUMBER OF
SHRTWV/VORT CENTERS ROTATING AROUND IT SO IT IS SMWHT DIFFICULT TO
SAY QUITE WHEN AND WHERE THE HEAVIER SNOW WILL FALL. OVERALL THIS
DOES NOT LOOK TO BE A MAJOR STORM WITH NO STRONG
SFC LOW
DEVELOPMENT AND MAINLY JUST LIGHT OR MODERATE SNOW AT TIMES...AS
NOTED ABOVE. FOR TOTAL SNOW...MOST GUIDANCE INCLUDING WPC SEEMED
TO INDICATE A WEST-EAST BAND OF GREATER SNOWFALL ACROSS THE MIDDLE
OF OUR
FCST AREA AND THAT IS REFLECTED IN OUR TOTAL SNOW GRID.
THE SNOW SHOULD HAVE MOSTLY ENDED BY EARLY WED MORNING...HOWEVER
THE UPPER
TROF WILL REMAIN OVER THE AREA DURING THE DAY ON WED SO
SCATTERED SNOW SHOWERS WILL REMAIN A POSSIBILITY. THERE WILL BE
DECENT COLD
ADVECTION BEHIND THE SYSTEM FROM LATE WEDNESDAY INTO
FRIDAY RESULTING IN TEMPS WELL BELOW
NORMAL TOWARD THE END OF THE
WEEK. HOWEVER EVEN COLDER ARCTIC AIR WILL PUSH INTO THE AREA ON
SATURDAY WITH SOME OF THE COLDEST TEMPS OF THE WINTER EXPECTED AT
THAT TIME. THIS PERIOD IS EXPECTED TO BE MOSTLY DRY HOWEVER THERE
COULD BE SNOW SHOWERS OR SQUALLS WITH THE ARCTIC FRONTAL PASSAGE