SWOMCD
SPC MCD 110529
LAZ000-TXZ000-111030-
MESOSCALE DISCUSSION 2442
NWS STORM PREDICTION CENTER NORMAN OK
1129 PM CST WED DEC 10 2008
AREAS AFFECTED...FAR SOUTHEAST TX AND WESTERN/CENTRAL LA
CONCERNING...WINTER MIXED PRECIPITATION
VALID 110529Z - 111030Z
MAINLY LIGHT SNOW/SOME SLEET IS EXPECTED TO DEVELOP EASTWARD ACROSS
PORTIONS OF FAR SOUTHEAST TX INTO WESTERN/CENTRAL LA OVERNIGHT.
LATEST WATER VAPOR IMAGERY FEATURES A CLOSED/LOW-LATITUDE UPPER LOW
SHIFTING EASTWARD TOWARD THE SABINE RIVER VICINITY OF FAR SOUTHEAST
TX/SOUTHWEST LA LATE THIS EVENING. UNUSUALLY COLD EARLY-SEASON
THERMAL PROFILES WILL BE CONDUCIVE FOR MAINLY LIGHT SNOW/SOME SLEET
ACROSS FAR SOUTHEAST TX INTO WESTERN/CENTRAL LA THROUGH THE EARLY
MORNING HOURS. 05Z OBSERVED SURFACE WET BULB 32F LINE...LOCATED FROM
NEAR LONGVIEW TX SOUTHWARD TO BETWEEN LUFKIN/JASPER TX TO NEAR/WEST
OF BEAUMONT TX...WILL CONTINUE A SLOW BUT STEADY EASTWARD
PROGRESSION INTO WESTERN LA OVERNIGHT AS COLD ADVECTION INCREASES IN
THE WAKE OF THE EASTWARD-SHIFTING UPPER TROUGH. MARGINAL THERMAL
PROFILES/MODEST UVV THROUGH THE ICE BEARING LAYER AND INITIALLY WARM
TERRESTRIAL TEMPERATURES WILL TEND TO KEEP SNOW ACCUMULATIONS LIGHT.
EVEN SO...A GRADUALLY COOLING COLUMN AND A NEARLY ISOTHERMAL LAYER
BETWEEN 1-3 KM...PER RUC FORECAST SOUNDINGS AND OBSERVED ACARS DATA
FROM NEAR HOUSTON...WILL FAVOR BOUTS OF STEADY LIGHT SNOW/SOME SLEET
ACROSS FAR SOUTHEAST TX INTO WESTERN/CENTRAL LA THROUGH THE EARLY
MORNING HOURS.
..GUYER.. 12/11/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
...NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
ATTN...WFO...LCH...SHV...HGX...
LAT...LON 29979452 30809488 31959381 31869266 30849210 30119262
29979452
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