MESOSCALE DISCUSSION 0311
   NWS STORM PREDICTION CENTER NORMAN OK
   0218 AM CDT SAT MAR 28 2009
   
   AREAS AFFECTED...CNTRL/ERN KS AND NCNTRL/NWRN OK
   
   CONCERNING...WINTER MIXED PRECIPITATION 
   
   VALID 280718Z - 281315Z
   
   CHALLENGING P-TYPE FCST CONTINUES ACROSS A GOOD PORTION OF CNTRL/ERN
   KS AND NRN OK EARLY THIS MORNING.  WATER VAPOR SHOWS THE UPR LOW
   TURNING E THROUGH THE RED RVR VLY WITH A HEALTHY WARM/MOIST CONVEYOR
   WRAPPING FROM AR NWWD INTO CNTRL KS.  MAINTENANCE OF A WARM LAYER IN
   THE H85-H7 LAYER HAS DELAYED EWD PROGRESSION OF THE RN/SN LINE AND A
   NARROW ZONE OF PE/FZRA CONTINUES ALONG ERN EDGE OF HVY PCPN RATES AT
   07Z...NAMELY ALONG/NW OF THE I-35/135 CORRIDOR FROM NEAR KPNC NEWD
   THROUGH KICT TO BETWEEN KLWC-KTOP.  TO THE W...BANDED MESOSCALE HVY
   SNOW WITH HRLY RATES OF 1-2 INCHES CONTINUES IN A 40-50 MILE WIDE
   CORRIDOR EXTENDING FROM NEAR/W OF KMHK SWWD TO KPTT THEN SW INTO
   NWRN OK.  
   
   PIVOT POINT FOR THE PCPN SEEMS TO HAVE MOVED SLIGHTLY SEWD TOWARD
   KAY/NOBLE COUNTIES IN OKLA SINCE 04Z.  THIS WILL EFFECTIVELY SHIFT
   THE STRONGEST LOW/MID-LVL FRONTOGENESIS FARTHER E INTO NCNTRL OK AND
   SCNTRL KS THROUGH MID-MORNING WITH THE INTENSE SNOWBANDS GRADUALLY
   DECREASING OVER THE TX/OK PNHDLS AND ERN PORTIONS OF SWRN KS.  TSTMS
   DVLPG ALONG THE KS/OK BORDER WILL EVENTUALLY ROTATE CYCLONICALLY
   INTO THE FAVORABLE MESOSCALE ASCENT...FURTHER ENHANCING PCPN RATES. 
   IT MAY TAKE SEVERAL HOURS FOR A COMPLETE PHASE CHANGE TO ALL SN IN
   THE KICT-KEWK-KTOP REGIONS UNTIL LATER THIS MORNING.  FARTHER E...A
   BLEND OF RN/PE IS LIKELY AT POINTS E OF I-35 AND INTO THE KMCI METRO
   FOR MOST OF THE MORNING.  
   
   SO IN SUMMARY...THROUGH AT LEAST DAYBREAK...THE MOST INTENSE PCPN
   RATES WILL GRADUALLY SHIFT EWD ACROSS NWRN OK/SCNTRL KS THROUGH
   DAYBREAK.  THE HEAVIEST SN CAN BE EXPECTED GENERALLY 20-30 NM EITHER
   SIDE OF A LINE EXTENDING FROM NEAR KSLN SWWD TO
   KHUT...KP28...KAVK/KPNC.  MOST INTENSE FZRA/PE RATES WILL OCCUR IN
   THE KEWK-ICT REGION.  THE RAIN-SNOW LINE WILL BEGIN TO SHIFT SLOWLY
   EWD INTO ERN KS AND NCNTRL-NERN OK BY MID-DAY AS LLVL WIND
   TRAJECTORIES BECOME SLIGHTLY W OF N FOLLOWING THE DEEPENING PROCESS
   OF THE SFC LOW ACROSS ERN OK.
   
   ..RACY.. 03/28/2009
   
   
   ATTN...WFO...EAX...TSA...TOP...ICT...OUN...DDC...
   
   LAT...LON   38649489 37969543 36669669 36109770 35739864 35709897
               36119935 36539959 37219963 37839909 38479833 38929761
               39229671 39389567 39269492 38989479 38649489