VALID 191157Z - 191800Z
BANDS OF HEAVY SNOW WITH RATES OF 1-2 IN/HR WILL PERSIST MAINLY FROM
ERN WV ACROSS NRN VA AND MD...DE...SERN PA AND SRN NJ. THE LONGEST
DURATION OF HEAVY SNOW RATES IS LIKELY TO BE OVER ERN WV...NRN
VA...AND MUCH OF MD.
A LARGE SHIELD OF SNOW CURRENTLY EXTENDS FROM NEAR THE UPPER LOW
CENTER OVER WV EWD N OF A DEEPENING SURFACE LOW. WARM ADVECTION
COUPLED WITH DEEP LAYER FRONTOGENESIS IS RESULTING IN PERSISTENT AND
MULTIPLE W-E BANDS OF HEAVY SNOW. DUE TO THE SLOW MOVEMENT OF THE
TROUGH...LONG DURATIONS OF HEAVY SNOW WILL OCCUR. THROUGH
18Z...EXPECT A SLIGHT PIVOT OF THE SNOW BANDS TO A WSW-ENE
ORIENTATION AS THE LOW LEVEL WINDS BACK A BIT. BROAD...PERSISTENT
FRONTOGENESIS SHOULD RESULT IN FURTHER CONSOLIDATION OF THE SNOW
BANDS OVER THE MCD AREA.
AS THE UPPER LOW PIVOTS EWD...COOLING ALOFT MAINLY ABOVE 650 MB WILL
RESULT IN A DEEPER DENDRITIC GROWTH LAYER YIELDING A MORE
TEMPERATURE PROFILE FOR PARTICULARLY HEAVY SNOW FROM 12-18Z ACROSS
ERN WV...NRN VA...AND CNTRL MD. SNOW RATES COULD INCREASE TO MORE
THAN 2 IN/HR AT TIMES.
No comments:
Post a Comment