MESOSCALE DISCUSSION 0307
   NWS STORM PREDICTION CENTER NORMAN OK
   1059 PM CDT FRI MAR 27 2009
   
   AREAS AFFECTED...SRN KS...OK/TX PANHANDLES...WRN/CNTRL OK
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 280359Z - 280800Z
   
   HEAVY SNOW WILL CONTINUE TO FALL ACROSS NWRN OK...SWRN/S CNTRL
   KS...AND THE TX PANHANDLE. STRONG NLY/NELY WINDS WITH GUSTS OF 30 TO
   40 MPH WILL CREATE BLIZZARD CONDITIONS IN BLOWING SNOW. CLOSER TO
   THE SURFACE FREEZING LINE...HEAVY ACCUMULATIONS OF SLEET WILL
   CONTINUE TO AFFECT PORTIONS OF N CNTRL OK INTO S CNTRL KS. JUST E OF
   THESE AREAS...A NARROW ZONE OF FREEZING RAIN WILL OCCUR IN S CNTRL
   KS AND N CNTRL OK. 
   
   AT 03Z...THE SURFACE FREEZING LINE HAS MADE VERY LITTLE
   PROGRESSION...AND NOW EXTENDS ROUGHLY FROM NEAR CHANUTE KS SWWD INTO
   WICHITA FALLS TX. THE STRONGEST DEFORMATION AXIS REMAINS TO THE N
   AND W OF THE UPPER LOW...ROUGHLY THROUGH MUCH OF SRN KS AND SWWD
   INTO THE TX PANHANDLE...WHERE HEAVY ACCUMULATIONS OF SNOWFALL HAVE
   BEEN REPORTED. FARTHER E...A DRY SLOT MOVING INTO CNTRL OK HAS
   SOMEWHAT LIMITED HEAVIER ACCUMULATIONS...AND MAINLY LIGHT SNOW IS
   BEING REPORTED ACROSS MUCH OF SWRN AND CNTRL OK W OF THE SURFACE
   FREEZING LINE. ACROSS N CNTRL OK AND INTO S CNTRL KS...WARM
   ADVECTION ATOP SUBFREEZING SURFACE LAYER CONTINUES...AND A NARROW
   TRANSITION FROM FREEZING RAIN NEAR THE SURFACE FREEZING LINE TO
   SLEET JUST W OF THESE AREAS WILL CONTINUE. HEAVY ACCUMULATIONS OF
   EACH HAVE ALSO BEEN REPORTED.
   
   THE UPPER LOW WILL CONTINUE TO DEEPEN OVER CNTRL OK BEFORE SHIFTING
   EWD. ALTHOUGH THE SURFACE FREEZING LINE WILL REMAIN NEARLY
   STATIONARY OVER THE NEXT FEW HOURS...DYNAMIC COOLING IN ASSOCIATION
   WITH THE SYSTEM MAY ALLOW SOME SITES TO TRANSITION OVER TO SNOW
   FASTER THAN MODELS FORECAST. HIGHEST RATES OF ACCUMULATION WILL
   SHIFT VERY SLIGHTLY EWD...ALTHOUGH THE NERN TX PANHANDLE...NWRN OK
   AND THE WRN OK PANHANDLE...AND SWRN KS WILL BE FAVORED FOR SNOW
   RATES OF NEAR 2 INCH/HR AS THE STRONGEST UVV REMAINS OVER THE
   AREA...AND HIGHER MOISTURE CONTINUES TO BE ADVECTED INTO THE AREA.
   GIVEN STRONG UPPER DYNAMICS AND WEAK ELEVATED INSTABILITY IN THESE
   AREAS...HIGHER RATES MAY BE POSSIBLE IN THUNDERSNOW.
   
   ..HURLBUT.. 03/28/2009
   
   
   ATTN...WFO...ICT...OUN...DDC...AMA...
   
   LAT...LON   35839764 35149938 35360057 35950173 37060171 37880011
               38399866 37919709 36459730 35839764