textproduct: Houston/Galveston

KEY MESSAGES

- Dangerous heat building this week with temperatures in the upper 90s/100s and heat indices of 104-112F. Heat Advisory in effect for Tuesday afternoon and will likely be needed for each afternoon through Friday.

- Patchy fog possible during the early to mid-morning hours for at least the next few days.

DISCUSSION

Issued at 1127 AM CDT Mon Jul 27 2026

If you like the idea of going to a sauna covered in a hot wet blanket, then this forecast is for you.

High pressure will continue to reign over southeast Texas as a 596-598 dam mid-level high centers itself over north Texas. It will remain parked there through at least mid-week and tag team with south-southeasterly winds to bring hot temperatures and elevated dew points. The combination of the heat and humidity will result in heat indices in the 105F to 110F range through the end of the week. This has led to the issuance of a Heat Advisory for Tuesday afternoon (and will likely need to be continued for each afternoon through Friday).

Unfortunately there won't be much relief during the overnight hours as lows remain in the upper 70s to low 80s. Overnight humidity and calm winds may lead to instances of patchy fog in the early to mid-morning hours over the next few days.

Rain chances remain nil through much of the period as PW values drop to around 1.3" (roughly 10th percentile for this time of year).

The high will retrograde west into the Four Corners region later in the week and a surface low is projected to develop in the Southern Plains around mid week. While this still isn't expected to produce an uptick in PoPs through Friday, an upper level trough draped over the eastern CONUS may be close enough in proximity to at least bring some precipitation to our eastern CWA this weekend into early next week (at this time chances are pretty low ~20-30%), but in any case something to keep an eye out for as we get further into the week.

With heat indices expected to be in the Advisory range for the next several days, please continue to keep heat safety in mind for any outdoor activities. Know the signs of heat-related illnesses, stay hydrated, and take frequent breaks from the heat. Also, please remember to LOOK BEFORE YOU LOCK, and bear in mind that if the pavement is too hot for your palm, it is too hot for your pets' paws.

Bailey

AVIATION

(00Z TAF Issuance) Issued at 623 PM CDT Mon Jul 27 2026

VFR and south flow should prevail through the evening. We're expecting a smattering of reduced visibility and low ceilings across the region late tonight/early tomorrow morning. Visibility restrictions should be slightly less expansive than earlier this morning due to slightly stronger winds within the top of the cloud-bearing layer, but there is still a 30-40% chance of localized high-end MVFR visibility restrictions across the "central portions" of our forecast area (impacting the UTS, CXO, and LBX TAF sites).

Low ceilings/stratus should be thin and ragged instead of a dense blanket and generally build from SW to NE across Southeast Texas from about 8-16Z tomorrow morning. Most TAFs carry an additional line for a FEW-SCT block of lower clouds, with only CLL, UTS, and CXO carrying a ceiling in the current TAFs. However, there is a 20-40% of at least short-lived MVFR ceilings at all TAF terminals.

All stratus should lift and scatter into a VFR Cu field in the mid to late morning, with south-southwest flow around 10 kts prevailing at all terminals in the afternoon.

MARINE

Issued at 1127 AM CDT Mon Jul 27 2026

Calm marine conditions continue with light to occasionally moderate southerly/southwesterly winds and 2-4 ft seas prevailing through the week.

Bailey

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 75 97 76 97 / 0 0 0 0 Houston (IAH) 78 99 79 100 / 0 0 0 0 Galveston (GLS) 83 91 83 92 / 0 0 0 0

HGX WATCHES/WARNINGS/ADVISORIES

TX...Heat Advisory from noon to 7 PM CDT Tuesday for TXZ163-164- 176>179-195>200-210>214-226-227-235>238-300-313-335>338.

GM...None.