SWOMCD
SPC MCD 121630
TXZ000-122030-
MESOSCALE DISCUSSION 0116
NWS STORM PREDICTION CENTER NORMAN OK
1030 AM CST SUN FEB 12 2012
AREAS AFFECTED...SWRN TX
CONCERNING...WINTER MIXED PRECIPITATION
VALID 121630Z - 122030Z
A BAND OF SNOW WILL SPREAD FROM SOUTH TO NORTH ACROSS THE EDWARDS
PLATEAU LATE THIS MORNING INTO THE EARLY AFTERNOON. SNOW RATES MAY
EXCEED ONE HALF INCH PER HOUR BEFORE CHANGING TO SLEET.
LLJ IS BEGINNING TO INCREASE ACROSS THE RIO GRANDE VALLEY INTO SWRN
TX AHEAD OF TRANSITORY SHORTWAVE TROUGH. BY EARLY EVENING IT
APPEARS A STRONG LLJ...IN EXCESS OF 50KT...WILL BE POSITIONED ACROSS
THE EDWARDS PLATEAU INTO WRN OK. LATEST RADAR DATA EXHIBITS AN E-W
BAND OF MOSTLY SNOW FROM TERRELL COUNTY...EWD TO GILLESPIE COUNTY IN
THE HILL COUNTRY. THIS BAND IS EVOLVING ALONG THE NOSE OF STRONGEST
WARM ADVECTION AND IS SPREADING/DEVELOPING NWD AT ROUGHLY 20KT.
GIVEN THE LOW WBZ LEVELS JUST NORTH OF THIS SNOW BAND IT APPEARS THE
ONSET OF PRECIPITATION WILL BE MOSTLY SNOW. HOWEVER...WITH TIME
WARM ADVECTION WILL CERTAINLY WARM THE PROFILES SUCH THAT A CHANGE
OVER TO SLEET SHOULD BE NOTED. OVERALL...TRANSITORY NATURE OF
CONVECTIVE BAND SHOULD LIMIT SNOW TOTALS.
..DARROW.. 02/12/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...EWX...SJT...MAF...
LAT...LON 30900194 31680089 31659914 30789842 30039915 29930105
30140192 30900194
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