368
FXUS64 KEWX 212344
AFDEWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
644 PM CDT FRI AUG 21 2026
..NEW AVIATION
KEY MESSAGES
UPDATED AT 611 PM CDT FRI AUG 21 2026
- HEAT ADVISORY IN EFFECT FORM THE NORTHERN HILL COUNTRY, I-35
CORRIDOR, AND COASTAL PLAINS THURSDAY-SUNDAY.
- BRIEF AND ISOLATED STORMS POSSIBLE OVER CENTRAL TX SATURDAY.
- AUGUST HEAT WAVE CONTINUES WITH NO SIGNIFICANT RAIN OR HEAT
RELIEF IN SIGHT.
SHORT TERM
(TONIGHT THROUGH SATURDAY NIGHT)
ISSUED AT 108 PM CDT FRI AUG 21 2026
AN UPPER LEVEL HIGH IS CENTERED OVER THE SOUTHERN ROCKIES WITH THE
RIDGE EXTENDING OVER TEXAS WHERE THE FLOW IS WEAKLY ANTICYCLONIC.
AT THE SURFACE, HIGH PRESSURE CENTERED OVER THE GULF IS PRODUCING
WINDS FROM THE SOUTH. THE AIRMASS OVER SOUTH-CENTRAL TEXAS REMAINS
HOT AND MOIST WITH LITTLE CHANGE IN TEMPERATURES OR DEWPOINTS OVER
THE LAST 24 HOURS. THE UPPER RIDGE WILL CONTINUE TO DOMINATE
THROUGH THE SHORT TERM PERIOD. WE EXPECT VERY LITTLE CHANGE TO THE
WEATHER. ALTHOUGH A FRONT WILL MOVE INTO NORTH TEXAS SATURDAY WITH
CONVECTION POSSIBLE INTO CENTRAL TEXAS. WE HAVE CONTINUED TO SHOW
15%-20% POPS OVER THE NORTHEASTERN COUNTIES SATURDAY AFTERNOON AND
EARLY EVENING. HIGH TEMPERATURES MIGHT BE A DEGREE OR TWO WARMER
SATURDAY AND A FEW SPOTS COULD REACH 105 DEGREES, BUT WE WILL
STICK WITH THE HEAT ADVISORY WITH LIMITED COVERAGE FOR THE HIGHEST
TEMPERATURES.
LONG TERM
(SUNDAY THROUGH NEXT FRIDAY)
ISSUED AT 108 PM CDT FRI AUG 21 2026
THE UPPER RIDGE WILL REMAIN OVER TEXAS THROUGH THE LONG TERM. WE
EXPECT ONLY MINOR CHANGES THROUGH THE PERIOD. SUBSIDENCE WILL
PREVENT ANY CONVECTION THROUGH NEXT WEEK. TEMPERATURES MAY
FLUCTUATE A FEW DEGREES UP OR DOWN EACH DAY, BUT GENERALLY HIGHS
WILL BE AROUND 100 EACH DAY FOR MOST OF THE AREA OUTSIDE THE
HIGHEST PARTS OF THE HILL COUNTRY AND SOUTHERN EDWARDS PLATEAU.
MODELS SHOW SOME BETTER VERTICAL MIXING BRINGING LOWER DEWPOINT
AIR TO THE SURFACE AND THUS LOWER HEAT INDICES. IF THIS PANS OUT
WE WILL NOT NEED HEAT ADVISORIES.
AVIATION
(00Z TAFS)
ISSUED AT 611 PM CDT FRI AUG 21 2026
VFR CONDITIONS ARE FORECAST FOR THE AVIATION PERIOD OF 24 TO 30
HOURS. SOUTHERLY FLOW OF 10 KNOTS OR LESS ARE FORECAST FOR THIS
EVENING THROUGH SATURDAY EVENING. THERE IS A VERY SLIGHT CHANCE
FOR A SHOWER OR ISOLATED THUNDERSTORM ACROSS THE AUSTIN AREA AND
VICINITY DURING THE LATE AFTERNOON. AS FAR AS AUS GOES ABOUT THIS
SLIGHT CHANCE OF SHOWERS OR A STORM OR TWO, PROBABILITIES AND
CONFIDENCE TOO LOW TO BE INCLUDED IN AUS TAF. WE WILL MONITOR AND
MAKE NECESSARY CHANGES ACCORDINDLY.
PRELIMINARY POINT TEMPS/POPS
AUSTIN CAMP MABRY 80 105 80 105 / 0 20 20 0
AUSTIN BERGSTROM INTL AIRPORT 79 104 79 104 / 0 20 20 0
NEW BRAUNFELS MUNI AIRPORT 77 104 77 103 / 0 10 10 0
BURNET MUNI AIRPORT 76 104 77 102 / 0 20 20 0
DEL RIO INTL AIRPORT 78 105 77 103 / 0 0 0 0
GEORGETOWN MUNI AIRPORT 79 104 80 104 / 0 20 20 0
HONDO MUNI AIRPORT 76 103 75 102 / 0 0 0 0
SAN MARCOS MUNI AIRPORT 76 103 77 103 / 0 10 10 0
LA GRANGE - FAYETTE REGIONAL 78 104 78 104 / 0 20 20 0
SAN ANTONIO INTL AIRPORT 78 103 78 103 / 0 0 10 0
STINSON MUNI AIRPORT 78 104 77 104 / 0 0 0 0
EWX WATCHES/WARNINGS/ADVISORIES
HEAT ADVISORY UNTIL 7 PM CDT SUNDAY FOR TXZ171>173-191>194-
205>209-220>225.
SHORT TERM...05
LONG TERM....05
AVIATION...17
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