560
FXUS64 KEWX 100643
AFDEWX
Area Forecast Discussion
National Weather Service Austin/San Antonio TX
143 AM CDT Fri Jul 10 2026
...New SHORT TERM, LONG TERM...
.KEY MESSAGES...
Updated at 137 AM CDT Fri Jul 10 2026
- Not as hot today as tropical moisture and a chance of convection
moves inland.
- Daily rain chances could lead to cumulative heavy rainfall
totals over 3 inches by Tuesday.
&&
.SHORT TERM...
(Today through Saturday)
Issued at 137 AM CDT Fri Jul 10 2026
A minor dust plume moved through the area Thursday and will be more
diluted today as a surge of tropical moisture moves inland. A broad
and somewhat chaotic region of instability is over Mexico and the
western Gulf and a pair of small mid-level eddies are moving north
into South TX and will raise PWat values along and east of I-35
into the 2.0-2.3 inch range by 00Z Saturday.
With the mid-level pattern being chaotic, there isn`t much
confidence on timing, amounts and location of the best chances, and
no one model looked to have a better handle on the PoPs than the
others, so we opted for a slight bump off the model blend, giving
more areas coverage, while tamping down some of the higher PoP
values where we could. Today`s better chances are predictably
favoring the Rio Grande Plains, San Antonio area, and Coastal
Prairies where the inland moisture deepens first. Then the rest of
the Short-Term forecast looks aimless and we`d assume daytime PoPs
should be 15-40 percent and nighttime PoPs being slightly lower.
There was however a slight agreement among models to show enhanced
rain chances near the Rio Grande after 00Z Sunday.
&&
.LONG TERM...
(Saturday night through Thursday)
Issued at 137 AM CDT Fri Jul 10 2026
Saturday night`s boost in rain chances out west is a reflection of
the mid levels showing a better organized cyclonic shear axis that
extends NE out of Mexico where a broader low pressure circulation
continues. The 00Z 7/10 run of the GFS depicts a local maxima of
PWat values around 2.2 inches around Eagle Pass.
Meanwhile a large northward surge of the subtropical ridge into the
Northern Plains states leaves a broadening region instability over
TX. N/E winds in the mid levels begin to pool moisture into an E-W
axis over N TX and shift it slowly southward Sunday night into early
next week. This is why the highest PoPs of the week are centered
Monday into Tuesday. If we were to take the model consensus of the
last couple deterministic GFS/ECM runs, we might see some daily
rainfall amounts topping an inch in spots through the weekend and
then some potential pockets of 1 to 3 inch downpours Monday and
Tuesday. Our Storm total QPF value look appropriate for this
relatively wet period with values below both the GFS and ECM totals
for the 5-day period. We might guess most areas should see over 1/2
inches of rain over 5 days while maybe half the forecast area gets
locally heavy storm totals in the 1 to 3 inch range over the
same period.
There is a concern that this is too aggressive with some PoPs in the
likely category, mainly the northern counties. The reason for the
concern is that an even stronger Saharan Air Layer (SAL) plume is
forecast to arrive onto the TX coast Monday. How far inland this
plume gets and how much impact it could suppress convection in a
high PWat environment will be interesting to track. If the PWat rich
period Monday and Tuesday asserts its will on the area, we may need
to think about some possible heavy rain and flooding concerns. On
the other hand, we could also oversell the rain chances (as we try
not to outguess the model data too much), and the later model runs
show lowering rain chances. Either scenario is possible, so perhaps
we`ll need another day or two of model trend analysis to get a
better handle on which is more likely. The dust modeling tools would
suggest the upcoming dust plume is both stronger and larger, so
eventually, the unsettled pattern should wane, and this is reflected
in the lowering of PoPs for Wednesday and beyond.
&&
.AVIATION...
(06Z TAFS)
Issued at 1259 AM CDT Fri Jul 10 2026
High clouds will gradually move northward through the region, with
VFR conditions expected along the I-35 corridor through the early
morning hours. We will keep a mention of FEW low clouds around
sunrise along I-35, but forecast soundings don`t support enough
clouds to warrant a mention of MVFR at this time. Farther west at
DRT, moisture profiles appear a little more favorable in the lower
levels and we did mention some TEMPO MVFR cigs this morning
between 13-16Z. Some afternoon convection may also develop today
across south central Texas, mainly near the I-35 corridor during
the peak heating hours. Current trends suggest SAT and SSF may be
slightly favored vs. AUS. For now, confidence is not high enough
to mention any PROB30 groups, but we will monitor and adjust the
forecast as needed.
&&
.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry 95 77 95 77 / 20 10 20 20
Austin Bergstrom Intl Airport 94 77 94 77 / 20 10 20 20
New Braunfels Muni Airport 93 75 94 75 / 40 20 30 20
Burnet Muni Airport 93 74 93 74 / 10 10 20 20
Del Rio Intl Airport 95 76 93 75 / 10 20 40 70
Georgetown Muni Airport 95 76 94 77 / 10 10 20 20
Hondo Muni Airport 91 75 91 74 / 30 30 50 50
San Marcos Muni Airport 94 76 94 76 / 20 20 30 20
La Grange - Fayette Regional 94 77 95 77 / 30 10 30 10
San Antonio Intl Airport 91 77 92 77 / 50 20 40 30
Stinson Muni Airport 92 77 92 77 / 50 20 50 20
&&
.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
SHORT TERM...18
LONG TERM....18
AVIATION...Platt
No recent Short Term Forecast (NOW) has been issued for NWS Austin/San Antonio CWA (EWX).
Special Weather Statement Issued: 07/08/2026 11:18:00 AM UTC
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