textproduct: Austin/San Antonio

KEY MESSAGES

- Rain showers with a few embedded storms continue through this afternoon in coastal plains; elsewhere mostly grey with some areas with light rain/drizzle and reductions in visibility.

- Patchy to areas of fog to expand in area after sunset and may linger into Thursday morning

- Drier, slightly cooler post-frontal airmass expected Thursday night into Friday then becoming much warmer with well above average temps from the weekend through early next week

SHORT TERM

(Tonight through Thursday night) Issued at 1159 AM CST Wed Dec 17 2025

Shower activity with the occasional isolated embedded thunderstorm has blossomed across the coastal plains, mainly south of Interstate 10, from mid to late this morning. An isolated location or two may see amounts around or a little more than an inch. The activity in the coastal plains should decrease from late afternoon through this evening. For many outside of the coastal plains, will continue to experience a grey, overcast day with general dampness from some lingering light drizzle/mist. Visibility across the region vary in short distances but may remain reduced for portions of the region into and through the afternoon. Best odds will be aligned right along the Balcones Escarpment. Lower visibilities will likely then expand after dark, and we'll monitor for any regions that dense fog could establish. The exception for the grey weather this afternoon occurs along the Rio Grande where sunshine is expected behind a clearing line that advances across the area. This is where the temperatures will trend warmest today, with highs reaching into the 70s. Underneath the cloud cover, the temperatures will struggle to climb with highs mainly topping in the low to mid 60s.

An unseasonably warm and mostly cloudy to overcast sky primarily is expected tonight in the advance of an approaching cold front with overnight lows in the 50s and low 60s for most. As mentioned in the paragraph above, we'll monitor for any potential dense fog tonight into early Thursday. This front is expected to move across the region sometime from mid-morning into mid-afternoon. It will result in a northerly wind shift with post-frontal wind gusts peaking in the 20 to 30 mph range. While conditions could promote elevated fire weather conditions with the combination of the winds and the drier humidity, the recent dampness/rainfall has area fuels with above normal fuel dryness. The peak winds do not last long and should begin to gradually drop off towards and after sunset. The north winds will help bring some cold air advection but it's nothing that is out of the ordinary for this time of year. It will lead to the coolest night in the forecast over the next week or so with the overnight lows into Friday morning dipping down into the mid 30s to the mid 40s.

LONG TERM

(Friday through next Wednesday) Issued at 1159 AM CST Wed Dec 17 2025

Friday will feature highs in the mid 60s to the low 70s and will be the coolest day within the long term as temperatures will soar for the rest of the period with well above average daytime highs becoming common from the mid 70s into the low 80s. Overnight lows are to climb as well reaching up into the 50s and low to mid 60s by early next week. This will be from the result of the return of a steady low-level/surface flow and the presence of a tame upper level pattern with ridging building in early next week after an initial period of nearly zonal flow. No rain is expected within the long term but do expect for a general uptick in clouds and moisture into early next week.

AVIATION

(00Z TAFS) Issued at 539 PM CST Wed Dec 17 2025

Poor flying conditions continue at this hour and through most of the forecast period. MVFR cigs have returned for all I-35 TAF sites. We expect these cigs to be brief as we did see some thinning of the cloud deck just before sunset. Have forecasted cigs to drop to IFR/LIFR in the next couple hours as fog sets in. We could see Vis drop to 1/2 mile overnight and remain low with low cigs through early morning. Expect light rain(drizzle) to continue mainly before midnight at all I-35 TAF sites. Cigs gradually improve late morning and we should see most sites return to a mix of MVFR and VFR by afternoon hours. For KDRT expect VFR cigs to continue before fog forms and becomes somewhat dense overnight. Cigs and vis improve by late morning/early afternoon as this system pushes off to the east.

PRELIMINARY POINT TEMPS/POPS

Austin Camp Mabry 59 77 43 67 / 10 0 0 0 Austin Bergstrom Intl Airport 59 78 40 68 / 10 0 0 0 New Braunfels Muni Airport 59 79 42 67 / 10 0 0 0 Burnet Muni Airport 56 72 38 66 / 10 0 0 0 Del Rio Intl Airport 48 80 42 70 / 0 0 0 0 Georgetown Muni Airport 58 74 38 67 / 10 0 0 0 Hondo Muni Airport 55 81 40 69 / 10 0 0 0 San Marcos Muni Airport 59 79 41 68 / 10 0 0 0 La Grange - Fayette Regional 61 78 42 67 / 10 0 0 0 San Antonio Intl Airport 59 79 44 67 / 20 0 0 0 Stinson Muni Airport 60 78 44 68 / 10 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES

None.