998 FXUS64 KEWX 181907 AFDEWXArea Forecast Discussion National Weather Service Austin/San Antonio TX 207 PM CDT Thu Sep 18 2025
.KEY MESSAGES...
- Continued warm through the weekend with a few showers and storms possible.
- A cold front brings a chance for rain beginning Tuesday with slightly cooler temperatures on Wednesday.
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.SHORT TERM (THROUGH FRIDAY NIGHT)... Little change is expected through the short term period with continued above normal high temperatures and near normal low temperatures. For today, we could see a few showers across portions of the Rio Grande plains mainly south of Eagle Pass and from the coastal plains northward along the Highway 77 corridor and perhaps as far west as Williamson county. A weak upper disturbance moves through north Texas tomorrow and may aid in the development of some isolated showers or storms across northern Burnet county. We can`t rule out a stray shower or storm over the coastal plains, but will hold off for now.
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.LONG TERM (SATURDAY THROUGH THURSDAY)... We will show a low chance for afternoon convection across the coastal plains on Saturday as a slight uptick in moisture is anticipated. With moisture increasing from south to north, some low rain chances will also spread northward for areas generally east of the I-35/I-37 corridor on Sunday afternoon. The slight uptick in rain chances can also be attributed to some weak disturbances embedded in the northwest flow aloft. There are some differences noted in the latest round of operational models with the large scale pattern as we head into the early and middle portion of next week. It appears the ECMWF has remained a little more consistent when compared to the GFS model. Will tend to lean toward the ECMWF at this time. This pattern should bring a cold front into the region late Tuesday. While there will be some low-level forcing along the front, the upper support generally remains farther north of our region. For now, we will keep rain chances in the 20-50% range for Tuesday, with higher chances remaining over the Hill Country and along and east of I-35. It is still too early to put much weight into the models this far out, but it currently appears rain amounts should generally remain at or below 1 inch.
Suspect rain chances will decrease from north to south on Wednesday and Thursday as drier air in the low-levels filters in behind the boundary. Highs on Wednesday will not drop much and should be very close to climatological normals. Temperatures should begin to nudge upward beginning Thursday.
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.AVIATION (18Z THURSDAY THROUGH SATURDAY)... All terminals will be VFR through the upcoming TAF period. Southeasterly winds from 5-10 kts continue through this afternoon There is a less than 20% chance of showers or thunderstorms during the afternoon in the Austin and San Antonio areas however kept mention out of the TAFS. Winds become light and variable for KSSF and KSAT overnight before southeasterly winds resume by early tomorrow afternoon. For KAUS winds shift southwesterly overnight before switching back to southeasterly tomorrow afternoon. At KDRT expect southeasterly winds around 10 kts with a few gusts up to 18 kts. Winds become light and east southeasterly for the rest of the TAF period.
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.PRELIMINARY POINT TEMPS/POPS... Austin Camp Mabry 72 96 71 96 / 0 10 0 0 Austin Bergstrom Intl Airport 71 95 69 95 / 0 10 0 0 New Braunfels Muni Airport 69 95 68 95 / 0 0 0 0 Burnet Muni Airport 71 91 69 92 / 10 10 0 0 Del Rio Intl Airport 73 94 73 95 / 0 10 0 0 Georgetown Muni Airport 71 94 69 94 / 10 10 0 0 Hondo Muni Airport 68 94 68 94 / 0 0 0 0 San Marcos Muni Airport 69 96 68 96 / 0 0 0 0 La Grange - Fayette Regional 70 95 67 95 / 0 10 0 10 San Antonio Intl Airport 73 95 72 94 / 0 0 0 0 Stinson Muni Airport 73 97 72 97 / 0 0 0 0
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.EWX WATCHES/WARNINGS/ADVISORIES... None.
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SHORT TERM...Platt LONG TERM...Platt AVIATION...CJM
NWS EWX Office Area Forecast Discussion