AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
430 AM CST FRI DEC 24 2004
.SHORT TERM (TODAY THROUGH TONIGHT)...MODELS HAVE TRENDED TO A
STRONGER AND SLOWER SOLUTION WITH THE UPPER TROUGH MOVING THROUGH
NORTHERN MEXICO INTO SOUTH TEXAS TONIGHT. WATER VAPOR IMAGERY AND
00Z UPPER AIR ANALYSIS GIVES CREDENCE TO A STRONGER SOLUTION WITH AN
UPPER LOW FORMING OVER NORTHERN MEXICO. 00Z 50H ANALYSIS SHOWED MUCH
STRONGER HEIGHT FALLS ASSOCIATED WITH THIS FEATURE THAN WAS FORECAST
BY THE MODELS LAST NIGHT. STRONG UPPER LEVEL JET...160 KNOTS AT
25H...WILL REMAIN IN PLACE OVER CENTRAL TEXAS WITH THE RIGHT
ENTRANCE REGION OF THE JET LOCATED OVER THE FORECAST AREA TODAY.
WINTRY PRECIPITATION EVENT SLOWLY EVOLVING OVER THE FORECAST AREA
FOR TODAY. COLD AIR HAS BEEN SLOW TO MOVE INTO THE REGION THIS
MORNING. ISENTROPIC LIFT HAS BEEN STEADILY INCREASING OVER THE
REGION WITH KCRP VAD WIND PROFILE SHOWING WARM AIR ADVECTION REGIME
IN PLACE IN THE 5-10 KFT LAYER. KCRP RADAR LOOP SHOWS LIGHT RETURNS
MAINLY OVER THE SOUTHERN COASTAL BEND ATTM. LOOKING AT FORECAST
SOUNDINGS...DRY LAYER IN PLACE FROM SURFACE TO 2KFT ALLOWING
PRECIPITATION TO CHANGEOVER TO LIGHT SNOW...
ALICE ASOS HAS BEEN
REPORT LIGHT SNOW FOR THE PAST COUPLE OF HOURS...DUE TO WET BULB
COOLING. WILL GO WITH A FORECAST OF LIGHT RAIN POSSIBLY MIXED WITH
OR CHANGING TO LIGHT SNOW THIS MORNING MAINLY OVER THE SOUTHERN
COASTAL BEND. EXPECT THIS WET-BULB COOLING WILL HELP BRING THE
TEMPERATURES SLOWLY DOWN TO THE LOWER TO MID 30S ACROSS THE REGION
LATER THIS MORNING AND STAY THERE FOR THE DAY. SUSPECT MODELS MAY
BE OVERDOING LOW LEVEL DRYING AS CEILINGS HAVE LOWERED TO BELOW
3KFT FROM KBKS TO KINGSVILLE. WILL CONTINUE THE WINTER WEATHER
ADVISORY FOR THE SOUTHERN COASTAL BEND FOR THIS MORNING MAINLY AS A
PRECAUTION WITH THE AMOUNT OF TRAVEL ON THIS DAY BEFORE THE HOLIDAY.
DO NOT EXPECT TO SEE SIGNIFICANT AMOUNTS OR PROBLEMS BUT ANY WINTRY
PRECIP FOR SOUTH TEXAS WILL LIKELY BE CONSIDERED SIGNIFICANT.
WITH A STRONGER UPPER LOW MOVING ACROSS SOUTH TEXAS...MODELS ARE
INDICATING A VERY STRONG UPWARD VERTICAL MOTION FIELD MOVING ACROSS
THE FORECAST AREA TONIGHT. THE COLD/DRY AIR AT THE SURFACE IS STILL
THE LIMITING FACTOR FOR AC ULATING PRECIPITATION. BUT IT LOOKS AS
IF THE STRONG UPWARD MOTION WILL LEAD TO SATURATION OF THE LOWER
LEVELS AND PROVIDE ANOTHER OPPORTUNITY FOR WINTRY PRECIPITATION
FOR TONIGHT MAINLY BEFORE MIDNIGHT FOR THE SOUTHERN COASTAL BEND.
MODEL SOUNDINGS SHOW THE EVENT SHOULD BE ALL SNOW FOR THIS CHRISTMAS
EVE. STILL TOO UNCERTAIN TO MENTION ANY HIGHLIGHTS AT THIS TIME AND
WILL ALLOW DAY SHIFT TO ASCERTAIN ADVISORY POSSIBILITIES FOR TNGT.
WILL GO AHEAD WITH ANOTHER FREEZE WARNING FOR TONIGHT.