566
FXUS64 KEWX 170524
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
1224 AM CDT Tue Jun 17 2025

...New AVIATION...

.SHORT TERM...
(Tonight through Tuesday night)
Issued at 245 PM CDT Mon Jun 16 2025

Key Messages:

- Elevated Heat Index values Today and Tuesday.

The mesoscale convective complex over south Texas has interrupted
onshore flow this afternoon and with hi-res models showing less in
the way of convection today, we have lowered rain chances for
portions of the coastal plains into the Highway 77 corridor for the
remainder of today. Otherwise, the forecast is on track with highs in
the lower 90s to near 100 degrees. Afternoon heat index values may
peak around 106 degrees today for locations mainly along and east of
the I-35 corridor and along the Rio Grande.

For Tuesday, we will keep the forecast dry across all of south
central Texas as the subtropical ridge axis begins to build in from
the west. Temperatures should inch upward a degree or two and this
may boost a few afternoon heat index values close to 108 degrees
along and east of I-35, as well as portions of the Rio Grande plains.

&&

.LONG TERM...
(Wednesday through Monday)
Issued at 245 PM CDT Mon Jun 16 2025

Dry weather is expected for Wednesday across south Central Texas.
Active weather stays across northeast Texas and eastern Oklahoma
with the passage of an upper level trough system. The upper level
trough axis extends to central Texas and Hill Country. Can`t totally
rule out a shower or storm across the southern Edwards Plateau mid
to late afternoon during the heating of the day. Otherwise, mostly
sunny skies with highs in the low to upper 90s with up to 107
degrees along the Rio Grande.

Increased moisture arrives overnight with clouds developing across
the coastal plains, I-35 corridor, and northern Hill Country. The
upper level trough axis mentioned above is forecasted to push to the
southeast into east Texas by early Thursday morning while an
inverted upper level trough moves across the western Gulf waters and
the Deep South. This scenario could bring some shower and
thunderstorm activity across the coastal plains and I-35 corridor
areas. The NAM and GFS guidance are keeping the local area
relatively dry on Thursday with a wetter solution coming out of the
ECMWF solution. So to account to these solutions, went with low PoPs
(20 to 40 percent) mainly for Thursday afternoon. Highs are expected
to reach the lower to mid 90s over most locations and up to 103
degrees along the Rio Grande.

By Friday, a weak upper level pressure system sits across central
Texas while the inverted upper level trough remains over the Deep
South. This could result in a few showers and may be isolated
thunderstorms across the coastal plains and getting as close as the
I-35 corridor. It is going to be cooler on Friday with highs in the
90s areawide.

The upcoming weekend looks to be relatively quiet for the most part
with period of isolated shower activity and maybe a few
thunderstorms in the afternoon period with the interaction of
outflows and seabreeze. As far as the temperatures go, normal
climate values are expected with highs in the upper 80s to mid 90s
for most places and upper 90s along the Rio Grande.

&&

.AVIATION...
(06Z TAFS)
Issued at 1224 AM CDT Tue Jun 17 2025

VFR flying conditions turn MVFR by 10Z at the I-35 sites and 12Z at
KDRT. Mixing brings a return to VFR late Tuesday morning. S to SE
winds prevail becoming breezy with gusts up to 25 KTs late morning
through evening on Tuesday.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              76  97  76  95 /   0   0   0  10
Austin Bergstrom Intl Airport  76  95  75  95 /   0   0   0  10
New Braunfels Muni Airport     75  96  75  95 /   0   0   0  10
Burnet Muni Airport            74  95  74  94 /   0   0   0  10
Del Rio Intl Airport           79 103  78 100 /   0   0   0   0
Georgetown Muni Airport        75  95  75  95 /   0   0   0  10
Hondo Muni Airport             75  97  75  94 /   0   0   0  10
San Marcos Muni Airport        75  95  75  95 /   0   0   0  10
La Grange - Fayette Regional   77  92  75  92 /   0   0   0  20
San Antonio Intl Airport       75  96  77  94 /   0   0   0  10
Stinson Muni Airport           76  96  77  95 /   0   0   0  10

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

Short-Term...Platt
Long-Term...17
Aviation...04