MESO: Mesoscale Discussion 0014

ACUS11 KWNS 051103
SWOMCD
SPC MCD 051102
TXZ000-051330-

MESOSCALE DISCUSSION 0014
NWS STORM PREDICTION CENTER NORMAN OK
0502 AM CST MON JAN 05 2009

AREAS AFFECTED...PARTS OF W CNTRL/N CNTRL TX

CONCERNING...FREEZING RAIN

VALID 051102Z - 051330Z

LIGHT FREEZING RAIN IS DEVELOPING...AND ACCUMULATING ICE APPEARS
POSSIBLE AS IT PERSISTS AT LEAST INTO THE LATE MORNING/MID DAY
HOURS.

MID-LEVEL MOISTURE INFLUX AND BROAD LARGE-SCALE ASCENT IS WELL
UNDERWAY...DOWNSTREAM OF A POSITIVELY TILTED UPPER TROUGH IN A
SOUTHERN BRANCH OF SPLIT POLAR ACROSS BAJA AND THE SOUTHWESTERN
STATES. AN ASSOCIATED INCREASE IN PRECIPITATION FROM ALOFT IS
GRADUALLY SATURATING A PREVIOUSLY WARM AND DRY LAYER IN THE
LOWER/MID TROPOSPHERE ACROSS CENTRAL TEXAS...AND THE COLD/DRY
BOUNDARY LAYER ASSOCIATED WITH THE RECENT COLD INTRUSION WILL FOLLOW
SUIT. WHILE LOW-LEVEL COLD ADVECTION IS BECOMING INCREASINGLY
NEGLIGIBLE...WET-BULB COOLING TO NEAR OR SUB-FREEZING TEMPERATURES
IS EXPECTED TO BECOME COMMONPLACE FROM THE EDWARDS PLATEAU THROUGH
PARTS OF THE TEXAS HILL COUNTRY...PERHAPS NORTHWARD INTO THE
DALLAS/FORT WORTH METROPLEX BY 14-15Z. WARM GROUND TEMPERATURES MAY
MITIGATE ICING CONCERNS ON MANY ROAD SURFACES...BUT POTENTIAL FOR
APPRECIABLE GLAZING OF EXPOSED OBJECTS AND ELEVATED ROAD SURFACES
WILL EXIST...AS RAINFALL RATES PERIODICALLY EXCEED .10 INCHES PER
HOUR THIS MORNING.

..KERR.. 01/05/2009

...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...FWD...EWX...SJT...

LAT...LON 29729855 29659912 29620009 29960107 30610145 31270117
31699994 32179893 32889771 32819690 30439768 29729855

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