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Feb 21-22 Storm Obs Thread


snowfan

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10.1" for the storm in Clarksburg.  It's just dumping snow out there right now.  Went to measure snowpack in a place where there was still snow from earlier in the week and the ruler disappeared.  Time to use the tape measure...

das my measurement as of 6:15 is close to 11.2"  And it is snowing much harder now than few hours ago!  Unbelievable!

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Mesoscale Discussion 89 < Previous MD mcd0089.gif MESOSCALE DISCUSSION 0089

NWS STORM PREDICTION CENTER NORMAN OK

0524 PM CST SAT FEB 21 2015

AREAS AFFECTED...PORTIONS OF FAR NRN VA...CNTRL MD...SERN PA...AND

NWRN NJ

CONCERNING...HEAVY SNOW

VALID 212324Z - 220330Z

SUMMARY...MODERATE TO HEAVY SNOW WILL CONTINUE THROUGH 02-03Z BEFORE

DIMINISHING LATER THIS EVENING. SNOWFALL RATES UP TO 1 INCH PER HOUR

WILL CONTINUE TO BE POSSIBLE.

DISCUSSION...23Z REGIONAL WSR-88D MOSAIC INDICATES AN EXPANSIVE AREA

OF MDT-HVY PCPN CONTINUES TO EXPAND NEWD ACROSS THE MID-ATLANTIC AND

INTO THE NORTHEAST/NEW ENGLAND. THIS EXPANSION IS IN RESPONSE TO

CONTINUED STRONG ISENTROPIC ASCENT ON THE NOSE OF A 75-KT LLJ.

REGIONAL VWP DATA ARE CHARACTERIZED BY LONG CYCLONICALLY LOOPING

HODOGRAPHS...INDICATIVE OF THE ROBUST WAA ONGOING ACROSS THE REGION.

IN CONCERT WITH LARGE-SCALE FORCING FOR ASCENT FROM AN APPROACHING

MID-LEVEL SHORTWAVE TROUGH...THIS STRONG WAA WILL SUPPORT CONTINUED

SNOWFALL RATES UPWARDS OF 1 INCH PER HOUR ACROSS THE MCD AREA.

THE SNOW WILL LIKELY MIX WITH AND CHANGE OVER TO SLEET/FZRA ACROSS

SRN/ERN PORTIONS OF THE AREA OVER THE NEXT FEW HOURS...AS THE WARM

NOSE ALOFT CONTINUES TO SPREAD NE. THE 12Z WRF-NSSL IS IN AGREEMENT

WITH THIS REASONING...AND ITS DEPICTION OF THE P-TYPE TRANSITION IS

WELL SUPPORTED BY CURRENT DUAL-POLARIZATION DATA/MPING REPORTS. BY

LATE THIS EVENING INTO EARLY TONIGHT...PCPN WILL GRADUALLY DECREASE

IN INTENSITY...AS FORCING FOR ASCENT WEAKENS AND DEPARTS TO THE

E/NE.

..PICCA/EDWARDS.. 02/21/2015

ATTN...WFO...PHI...CTP...LWX...

LAT...LON 39287647 38907731 38647780 39157796 39697735 40137662

40747547 40927495 40987471 40797449 40217476 39647558

39257646 39287647

 
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