MESO: Mesoscale Discussion 0241

ACUS11 KWNS 282337
SWOMCD
SPC MCD 282337
MEZ000-010330-

MESOSCALE DISCUSSION 0241
NWS STORM PREDICTION CENTER NORMAN OK
0537 PM CST THU FEB 28 2013

AREAS AFFECTED...NRN/ERN MAINE

CONCERNING...HEAVY SNOW

VALID 282337Z - 010330Z

SUMMARY...A SHIELD OF HEAVY SNOW WITH RATES OF 1-2 IN/HR WILL
PERSIST INTO THE EVENING...WITH THE PRECIPITATION EXPECTED TO
GRADUALLY TAPER OFF AFTER 03Z-04Z.

DISCUSSION...A MID-LEVEL SHORTWAVE IMPULSE PIVOTING AROUND A LARGER
CYCLONIC GYRE OVER THE NERN STATES -- PER RECENT MOISTURE-CHANNEL
IMAGERY -- WILL CONTINUE TRACKING WNWWD ACROSS NRN NEW ENGLAND.
MID-LEVEL ISENTROPIC ASCENT LEADING THIS IMPULSE ALONG WITH THE
INFLUX OF MOISTURE FROM AN OFFSHORE WARM CONVEYOR BELT CONTINUE TO
SUPPORT A SHIELD OF HEAVY SNOW ACROSS NRN/ERN MAINE PER RECENT SFC
OBSERVATIONS. SNOW RATES OF 1-2 IN/HR ARE OCCURRING IN ASSOCIATION
WITH THIS ACTIVITY...AND WILL LIKELY CONTINUE THROUGH AROUND
03Z-04Z. THE HIGHEST SNOW RATES WILL OCCUR IN CONJUNCTION WITH
THUNDERSNOW...WITH LIGHTNING DATA SUGGESTING THE OCCURRENCE OF A
COUPLE OF CLOUD-TO-GROUND STRIKES DURING THE PAST HOUR OR SO. LATER
IN THE EVENING...SNOW RATES SHOULD TAPER OFF...AS FORCING FOR ASCENT
ACCOMPANYING THE SHORTWAVE TROUGH MOVES FARTHER INTO CANADA.

..COHEN.. 02/28/2013

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

ATTN...WFO...CAR...

LAT...LON 45566887 46066922 46846935 47446914 47266886 47316844
47356826 47046778 46706778 46066779 45596756 45306764
45176825 45566887

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