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Mesoscale Discussion 90
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   MESOSCALE DISCUSSION 0090
   NWS STORM PREDICTION CENTER NORMAN OK
   0929 PM CST SAT FEB 21 2015

   AREAS AFFECTED...SERN CO/SWRN KS/FAR NERN NM/OK PANHANDLE/FAR NRN TX
   PANHANDLE

   CONCERNING...HEAVY SNOW 

   VALID 220329Z - 220930Z

   SUMMARY...AN E-W ORIENTED MESOSCALE BAND WITH MODERATE-HEAVY
   SNOWFALL RATES WILL CONTINUE TO DEVELOP LATE THIS EVENING THROUGH
   THE OVERNIGHT IN VICINITY OF A COLD FRONT ADVANCING SWD THROUGH SERN
   CO AND SWRN KS INTO NERN NM AND THE OK/NRN TX PANHANDLES.  SNOWFALL
   RATES TO AROUND 1 INCH/HR WILL BE POSSIBLE.

   DISCUSSION...TRENDS IN MOSAIC RADAR IMAGERY AND SURFACE ANALYSES
   SHOWED A COLD FRONT ADVANCING SWD...AND AT 03Z THIS BOUNDARY
   EXTENDED FROM CENTRAL TO WEST-CENTRAL KS INTO EAST-CENTRAL CO. 
   SNOWFALL RATES ALONG THIS COLD FRONT WERE MAINLY
   LIGHT-MODERATE...THOUGH HEAVY RATES WERE OBSERVED IN GLD EARLIER
   THIS EVENING /BETWEEN 23-01Z/ WITH THE FRONTAL PASSAGE. 
   MEANWHILE...IN ADDITION TO SOME INCREASE IN CONVERGENCE EXPECTED
   ALONG THE FRONT AS IT MOVES SWD THROUGH THE DISCUSSION AREA...00Z
   NAM REMAINS CONSISTENT SHOWING LOW-LEVEL /850-MB/ FRONTOGENESIS
   OCCURRING OVER SERN CO/SWRN KS INTO THE EARLY OVERNIGHT PERIOD. 
   FRONTOGENETICAL FORCING WILL ENHANCE ASCENT AS THE COLD FRONT MOVES
   SWD...WITH THIS FORCING ALSO DEVELOPING SWD INTO THE OK/NRN TX
   PANHANDLES AND NERN NM LATER TONIGHT/EARLY SUNDAY MORNING.  FORECAST
   SOUNDINGS SUGGESTED UPWARD VERTICAL MOTION IN THE DENDRITIC GROWTH
   ZONE SHOULD FURTHER ENHANCE SNOWFALL RATES.

   ALTHOUGH LIGHT RAIN WAS ONGOING AT DDC/GCK AND INTO PARTS OF THE OK
   PANHANDLE...LOW-LEVEL COLD-AIR ADVECTION SPREADING SWD WILL SUPPORT
   A CHANGE OVER TO SNOW BY 04-05Z IN SWRN KS AND AFTER 06Z IN THE OK
   PANHANDLE.

   ..PETERS.. 02/22/2015


   ATTN...WFO...DDC...GLD...AMA...PUB...ABQ...

   LAT...LON   36290059 36170181 36300364 37180413 37560419 37830409
               38120400 38370386 38440362 38520306 38500267 38330210
               38210123 38210092 38160056 37990004 37489981 36640017
               36290059 

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Page last modified: February 22, 2015
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