textproduct: Brownsville/Rio Grande Valley
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
Updated at 535 AM CDT Thu Aug 20 2026
- Hot and rain-free conditions will continue through early next week. - Moderate (level 2 of 4) to major risk (3 of 4) of heat-related impacts 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 1035 PM CDT Wed Aug 19 2026
A mid-level ridge anchored over the Four Corners region Friday will gradually move southeastward over Texas this weekend into early next week. This will continue to lead to strong subsidence across Deep South Texas with very hot and 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 late week into the weekend.
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
(12Z TAFS) Issued at 535 AM CDT Thu Aug 20 2026
VFR will prevail at the aerodromes through the next 24 hours.
MARINE
Issued at 1035 PM CDT Wed Aug 19 2026
A slightly enhanced pressure gradient over the western Gulf may produce brief Small Craft Should Exercise Caution conditions on the Laguna Madre at times Friday through the weekend. Otherwise, mariners can expect moderate south to southeast winds and seas of 2 to 3 feet through the period.
PRELIMINARY POINT TEMPS/POPS
BROWNSVILLE 98 81 98 79 / 0 0 0 0 HARLINGEN 101 78 103 75 / 0 0 0 0 MCALLEN 103 81 104 79 / 0 0 0 0 RIO GRANDE CITY 104 79 105 76 / 0 0 0 0 SOUTH PADRE ISLAND 90 82 90 81 / 0 0 0 0 BAYVIEW/PORT ISABEL 97 80 98 78 / 0 0 0 0
BRO WATCHES/WARNINGS/ADVISORIES
None.
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