Spring Branch, Texas Weather Forecast Discussion

067
FXUS64 KEWX 080547
AFDEWX
Area Forecast Discussion
National Weather Service Austin/San Antonio TX
1247 AM CDT Mon Sep 8 2025
.KEY MESSAGES...
- Low chances for a lingering isolated shower or storm today
  over the southern Edwards Plateau, western Hill Country, and
  Rio Grande.
- Dry conditions spread across the area by Tuesday and continue
  through the week.
&&
.SHORT TERM (THROUGH TUESDAY)...
Drier air aloft is beginning to spread across the region on the
upstream side of an upper trough axis, resulting in calmer weather
conditions for most of South Central Texas. Some patchy fog is
possible this morning in low-lying drainage areas that received
rains from this past weekend. While atmospheric moisture is steadily
diminishing this morning with precipitable water values expected to
fall below 1.5 inches for most of the region by the day`s end, low
level winds and evapotranspiration from the weekend`s rains will
keep moisture a little elevated along the Rio Grande, leaving the
door open for some lingering isolated showers (20 to 30 percent
chances from the early morning and through the day) mainly along and
west of Highway 83 to the Rio Grande. Hi-res models keep the
activity weak, but low convective temperatures and modest residual
instability suggest an isolated rumble of thunder can`t be ruled out
before succumbing to more dry air arriving from the northeast.
Otherwise, it`ll be a mostly dry day with a mix of sunnier skies
east of Highway 281/I-37 and cloudier west. A thermal trough axis
extended northeast to southwest across South Central Texas should
put a lid on temperatures even with the added sunshine, so highs
range from the low 80s over the southern Edwards Plateau to mid to
upper 80s along the I-35 corridor and low 90s over the Coastal
Plains to Winter Garden region.
The combination of continued weak northeast winds near the surface
and in the mid-levels will make for a relatively dry Monday night
into Tuesday morning, allowing for overnight lows to drop into the
60s for most of the region with low 60s north of I-10. A few low-
lying spots could briefly dip into the upper 50s as dew points drop
overnight. Temperatures warm quickly Tuesday under those dry
conditions, but a lack of thermal ridging will continue to put a
soft lid on temperatures. Afternoon temperatures should be a touch
warmer than Monday, with upper 80s over the Hill Country and low to
mid 90s elsewhere.
&&
.LONG TERM (TUESDAY NIGHT THROUGH SUNDAY)...
Quiet and sunny weather is expected to continue through most of the
week as an upper-level ridge slides into Texas from northeastern
Mexico. Highs show a subtle warming trend through the week but
should settle into the mid to upper 90s along the I-35 corridor and
Coastal Plains with upper 80s to low 90s across the southern Edwards
Plateau and Hill Country. Wednesday morning should be another cool
and dry one with widespread values in the low to mid 60s especially
north of I-10, but returning moisture in the latter half of the week
will bring most outside of the Edwards Plateau and Hill Country back
into the upper 70s and low 70s for lows heading into the weekend.
The upper-level ridge keeps rain chances out of the picture for most
during the week, though chances for an isolated coastal shower and
storm activity in the afternoon and evening grow slightly later in
the week and into the weekend with the gradually increasing
moisture. Troughing increases over the Rockies this weekend, leading
to a return of low rain chances over a broader portion of the area
over the weekend into next week.
&&
.AVIATION (06Z MONDAY THROUGH TUESDAY)...
SHRA and IFR/MVFR CIGs will linger over the Rio Grande Plains into
the Edwards Plateau overnight into Monday and will maintain mention
at KDRT. Elsewhere, areas of low VFR CIGs FL035-050 slowly erode by
Monday night as drier air filters into our area. Due to RA on
Sunday, increased soil moisture may result in 1SM BR at KSAT early
in the morning from 10Z-14Z. Wind speeds generally less than 10 KTs
are expected with NE prevailing at the I-35 sites and E at KDRT.
&&
.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              65  94  66  95 /   0   0   0   0
Austin Bergstrom Intl Airport  64  93  63  95 /   0   0   0   0
New Braunfels Muni Airport     64  94  65  95 /   0   0   0   0
Burnet Muni Airport            62  88  63  91 /   0   0   0   0
Del Rio Intl Airport           72  92  70  93 /   0   0   0   0
Georgetown Muni Airport        61  91  61  93 /   0   0   0   0
Hondo Muni Airport             66  92  65  94 /   0   0   0   0
San Marcos Muni Airport        63  94  63  96 /   0   0   0   0
La Grange - Fayette Regional   63  91  62  94 /   0   0   0   0
San Antonio Intl Airport       68  93  67  95 /   0   0   0   0
Stinson Muni Airport           69  95  69  96 /   0   0   0   0
&&
.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
SHORT TERM...Tran
LONG TERM...Tran
AVIATION...04

NWS EWX Office Area Forecast Discussion