839
FXUS64 KEWX 210546 AAC
AFDEWX
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1146 PM CST FRI NOV 20 2009
DISCUSSION
SEE AVIATION SECTION.
AVIATION
VFR CIGS PREVAIL AT KSAT/KSSF...BUT WILL DETERIORATE AROUND 10Z WHEN
LOW-END MVFR CIGS DEVELOP. IFR CIGS/VSBYS ARE FORECAST AT
KAUS...WITH IMPROVEMENT BACK TO MVFR BY 16Z. LIFR VSBYS ARE
FORECAST TO DEVELOP AFTER MIDNIGHT SATURDAY INTO EARLY SUNDAY
MORNING. VFR CONDITIONS WILL PREVAIL AT KDRT THROUGH THE PERIOD. A
LIGHT TO MODERATE NORTHERLY LOW LEVEL FLOW WILL CONTINUE INTO
SATURDAY MORNING AND THEN BECOME ENE.
PREV DISCUSSION
/ISSUED 624 PM CST FRI NOV 20 2009/
UPDATE...
UPDATE TIMING IS MAINLY TO REFLECT EXPIRATION OF FLASH FLOOD WATCH.
THE INCREASED DRYING TREND AND EVAPORATIVE COOLING EFFECTS ON THE
LAST ROUND OF RAINS IS ACCELERATING THE TEMPERATURE DROPS THIS
EVENING. THUS, WENT AHEAD AND LOWERED MIN TEMPS TONIGHT AND
INTRODUCED SOME PATCHY FOG FOR THE NEXT COUPLE MORNINGS. ALSO, AN
EVENING INCREASE TO LIKELY POPS WAS ADDED FOR THE S/SE COUNTIES
WHERE A NEAR SOLID BAND OF SHOWERS CONTINUES TO WORK EAST ACROSS
THE SAT AREA.
PREV DISCUSSION... /ISSUED 522 PM CST FRI NOV 20 2009/
DISCUSSION...
SEE AVIATION SECTION.
AVIATION...
A ROUND OF RAIN WILL AFFECT I-35 TERMINALS BETWEEN 00-04Z...WITH
IFR CIGS FORECAST. IFR CONDITIONS WILL PREVAIL SATURDAY
MORNING...WITH IMPROVEMENT TO VFR BETWEEN 18-19Z. VFR CONDITIONS
WILL PREVAIL AT KDRT THROUGH THE TAF PERIOD. A LIGHT TO MODERATE
NORTHERLY LOW LEVEL FLOW WILL CONTINUE INTO SATURDAY.
PREV DISCUSSION... /ISSUED 303 PM CST FRI NOV 20 2009/
DISCUSSION...
UPPER TROUGH WILL PUSH EAST OF REGION BY DAWN. CENTER OF LOW WILL
MIGRATE ACROSS AREA THIS EVENING WITH A GOOD CHANCE OF SHOWERS
EASTERN HALF TIL MIDNIGHT...AFTER MIDNIGHT..SHOWERS EXITING EASTERN
CWA. WILL MAINTAIN THE FLASH FLOOD WATCH UNTIL 6 PM. MOSTLY SUNNY
TOMORROW WITH STRONG NORTHWEST FLOW ALOFT BEHIND THE UPPER LOW.
MOSTLY CLEAR TOMORROW NIGHT WITH SOUTHERLY FLOW RETURNING TO THE HILL
COUNTRY AHEAD OF A WEAK SHORT WAVE. THIS WEAK DISTURBANCE WILL
PUSH ACROSS THE AREA SUNDAY WITH ONLY A FEW MID/HIGH CLOUDS.
INCREASING MOISTURE AND CLOUDINESS MONDAY WITH MILD DAYTIME
TEMPERATURES. ANOTHER COLD FRONT WILL ARRIVE EARLY TUESDAY WITH
A SLIGHT/LOW CHANCE OF SHOWERS UNDER ZONAL FLOW ALOFT. A COOL
RIDGE WILL BUILD DOWN TUESDAY NIGHT AS THE NORTHERN STREAM SWEEPS
SOUTH INTO THE SOUTHERN GREAT PLAINS. DISTURBANCES WILL CARVE A
TROUGH INTO THE ARKLATEX AREA WEDNESDAY ANCHORING A COOL DRY
RIDGE OVER THE CWA FOR THANKSGIVING. MOSTLY SUNNY BUT COOL
WEATHER EXPECTED ON THANKSGIVING WITH HIGHS IN THE MID 60S TO NEAR
70. A DRY WEST NORTHWEST FLOW DRY PATTERN WILL SET UP A WARMING
NEXT FRIDAY INTO SATURDAY.
PRELIMINARY POINT TEMPS/POPS
AUSTIN CAMP MABRY 51 69 47 72 55 / 40 - 0 - -
AUSTIN BERGSTROM INTL AIRPORT 48 70 41 75 50 / 50 - 0 - -
NEW BRAUNFELS MUNI AIRPORT 50 70 44 73 52 / 60 - 0 - -
BURNET MUNI AIRPORT 46 67 47 68 52 / 30 - 0 - -
DEL RIO INTL AIRPORT 44 74 50 72 53 / - 0 0 - -
GEORGETOWN MUNI AIRPORT 47 67 47 70 53 / 40 - 0 - -
HONDO MUNI AIRPORT 46 73 46 70 53 / 20 - 0 - -
SAN MARCOS MUNI AIRPORT 49 69 46 73 54 / 50 - 0 - -
LA GRANGE - FAYETTE REGIONAL 52 67 44 72 54 / 70 10 0 10 -
SAN ANTONIO INTL AIRPORT 49 71 47 72 56 / 50 - 0 - -
STINSON MUNI AIRPORT 50 71 47 73 55 / 60 - 0 - -
EWX WATCHES/WARNINGS/ADVISORIES
NONE.
18/11
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