SPC MD 176

MD 0176 CONCERNING HEAVY SNOW FOR CENTRAL KS TO NE OK


MESOSCALE DISCUSSION 0176
NWS STORM PREDICTION CENTER NORMAN OK
0756 AM CST WED FEB 20 2013

AREAS AFFECTED...CENTRAL KS TO NE OK

CONCERNING...HEAVY SNOW

VALID 201356Z - 201800Z

SUMMARY...A NW-SE ORIENTED BAND OF SNOW WILL SPREAD SLOWLY NEWD
THROUGH MIDDAY AS THE LOW-LEVELS SATURATE.  SNOWFALL RATES WILL
APPROACH ONE INCH PER HOUR.

DISCUSSION...A BAND OF LOW-MIDLEVEL FRONTOGENESIS AND WAA IS
SUPPORTING A SWATH OF PRECIPITATION FROM S CENTRAL KS INTO CENTRAL
OK.  12Z SOUNDINGS REVEALED THERMAL PROFILES SUPPORTIVE OF SNOW AS
THE PRECIPITATION BAND DEVELOPS NEWD IN ADVANCE OF AN EJECTING SPEED
MAX WITHIN THE SUBTROPICAL JET.  LIQUID ACCUMULATION RATES WILL
INCREASE TO 0.05 TO 0.10 INCH PER HOUR BASED ON OBSERVATIONS ACROSS
OK...AS THE LOW LEVELS SATURATE FROM ABOVE...WHICH WILL ALSO RESULT
IN WEB-BULB COOLING TO TEMPERATURES AOB 32 F AT THE SURFACE.
THUS...SNOWFALL ACCUMULATION RATES COULD APPROACH ONE INCH PER HOUR
FOR SEVERAL HOURS WITHIN THIS BAND...WHICH WILL LIKELY PERSIST
THROUGH MIDDAY.

..THOMPSON.. 02/20/2013

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

ATTN...WFO...TSA...ICT...OUN...DDC...

LAT...LON   36579559 36199561 35999589 36129661 36429731 36599760
            36809803 37049834 37409878 38129939 38469951 38799935
            38909892 37549710 37079627 36579559

via SPC Forecast Products http://www.spc.noaa.gov/products/md/md0176.html