764
FXUS64 KBRO 220539 AAA
AFDBRO

Area Forecast Discussion...UPDATED
National Weather Service Brownsville TX
1239 AM CDT Sat Aug 22 2026

...New AVIATION...

.KEY MESSAGES...
Updated at 1237 AM CDT Sat Aug 22 2026

 - Hot and rain-free conditions will continue through late next week.

 - Moderate (level 2 of 4) to major risk (3 of 4) of heat-relatedimpacts
   through the period with peak afternoon heat indices generally
   between 105 to around 110 degrees.

 - The combination of low minimum relativity humidity values, dry fuels,
   and very hot temperatures could lead to the potential for
   rapid wildfire spread through the period.

&&

.DISCUSSION...
Issued at 1038 PM CDT Fri Aug 21 2026

A 500 mb ridge will meander over the Four Corners region through the
middle of next week. This will continue to provide strong subsidence
across Deep South Texas with very hot and mainly rain-free
conditions through forecast period. Daily high temperatures are
expected to reach the upper 90s to around 105 degrees, except near
the coast. The combination of the very hot temperatures and elevated
dewpoint temperatures will support heat indices generally between
105 to 110 degrees each afternoon. Heat indices may briefly reach
111+ at a few locations in the afternoon, but temperatures should
remain just below Heat Advisory criteria each day. Widespread
Moderate (Level 2 of 4) to Major (Level 3 of 4) Heat Risk expected
through the weekend and into the middle of next week. Some pockets
of Extreme (Level 4 of 4) Heat Risk will be possible by late next
week.

The combination of low minimum relativity humidity values, dry
fuels, and very hot temperatures could lead to the potential for
rapid wildfire spread through the period.

&&

.AVIATION...
(06Z TAFS)
Issued at 1237 AM CDT Sat Aug 22 2026

VFR conditions are forecast to continue through the TAF period.
Light southeasterly winds are forecast to continue through the
morning, with wind speeds and gusts increasing Saturday afternoon.

&&

.MARINE...
Issued at 1038 PM CDT Fri Aug 21 2026

A slightly enhanced pressure gradient over the western Gulf may
produce Small Craft Should Exercise Caution conditions on the Laguna
Madre at times. Otherwise, mariners can expect generally favorable
conditions with moderate south to southeast winds and seas of 2 to 3
feet through the period.

&&

.PRELIMINARY POINT TEMPS/POPS...
BROWNSVILLE            100  79  98  80 /   0   0   0   0
HARLINGEN              104  75 103  76 /   0   0   0   0
MCALLEN                106  78 105  79 /   0   0   0   0
RIO GRANDE CITY        106  76 105  76 /   0   0   0   0
SOUTH PADRE ISLAND      90  80  89  81 /   0   0   0   0
BAYVIEW/PORT ISABEL     98  77  97  78 /   0   0   0   0

&&

.BRO WATCHES/WARNINGS/ADVISORIES...
TX...None.
GM...None.
&&

$$

SHORT TERM...63
LONG TERM....63
AVIATION...60-BE