textproduct: Houston/Galveston

KEY MESSAGES

- Dangerous heat building this week with temperatures in the upper 90s/100s and heat indices of 104-112F. Heat Advisories likely at times during the upcoming work week.

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

DISCUSSION

Issued at 1056 PM CDT Sun Jul 26 2026

Hot, then even hotter. Maybe some rain late in the week. The end.

Oh wait you're still here?! That pretty much sums up the forecast period, but I'll gladly add some more context! High temperatures on Sunday topped out in the low to mid 90s once again, which seems "cool" compared to what's ahead for the work week. The 596-598 dam mid-level high (the heatdome) is currently centered near the intersection of TX/OK/CO/NM...so it's continuing to gradually nudge eastward towards the Central and Southern Plains. Going into Monday, the heatdome begins to slide into north TX where it'll remain through at least midweek. 850mb temperatures will gradually increase each day leading to a gradual climb in high temperatures. Expect temperatures to top out in the upper 90s to low 100s throughout the work week. We haven't even talked about everyone's favorite word this time of the year...the humidity.

South-southwesterly to southerly surface flow should keep dew points elevated (low to mid 70s) closer to the coast. Further inland, we should see dew points mixing out into at least the upper 60s to low 70s in the afternoons during the work week. The air temperatures will be high enough though that we'll still see heat indices peaking near or above the Heat Advisory threshold (greater than 108 degrees) at times this week, especially Tuesday and beyond. Speaking of Heat Advisories, we decided to hold off again on issuing one for Monday. While a few sites will reach criteria again, we aren't expecting it to be widespread enough to warrant issuing an advisory. Tuesday and beyond has much better potential for Heat Advisories.

There won't be much relief overnight with low temperatures mainly in the upper 70s to low 80s. The atrocious humidity overnight will result in occasional rounds of patchy fog in the early to mid morning hours for at least the next few days. PW values decrease going into Monday closer to the 10th percentile (~1.36") through at least midweek, so rain chances will be slim to none for most of the work week. Towards the end of the work week, the heatdome begins to retreat westward a bit which looks to open the door for our next chance of showers/storms. Yesterday we talked about how ensemble guidance shows the potential for surface low pressure developing in the Southern Plains late in the week that may bring a frontal boundary nearby over the weekend. The potential for this is still there, and the synoptic flow would support it as an an upper level trough pushes through the eastern CONUS over the weekend. This coincides with increasing moisture, and thus we do have rain chances in the forecast for the weekend! To get there though, we'll have to make it through the triple digit heat of the work week...and even then it's not likely that all of us will see rain!

With heat indices expected to be near or above Heat Advisory criteria over the next several days, please keep heat safety at the top of your minds for any plans that you make (especially if outdoors). Know the signs of heat-related illnesses, stay hydrated (with water), take frequent breaks from the heat, wear loose/light- colored clothing and sunscreen, and ALWAYS ALWAYS ALWAYS LOOK before you LOCK your vehicle. Don't forget about your pets as well! If the ground is too hot for the palm of your hand, then it is too hot for their paws.

Batiste

AVIATION

(00Z TAF Issuance) Issued at 635 PM CDT Sun Jul 26 2026

Expect another cycle of isolated early morning MVFR cigs/vis outside the metro terminals, which burn off by mid morning. Otherwise, VFR conditions will prevail. Isolated SH/TS possible for our coastal TAF sites with the afternoon sea breeze, but confidence remains too low to warrant a mention in the TAF.

JMG

MARINE

Issued at 1056 PM CDT Sun Jul 26 2026

A period of benign marine conditions continues with light to occasionally moderate southerly/southwesterly winds and 2-4 ft seas prevailing well into next week.

Batiste

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 76 97 76 98 / 0 0 0 0 Houston (IAH) 78 99 78 100 / 0 0 0 0 Galveston (GLS) 83 91 83 92 / 0 0 0 0

HGX WATCHES/WARNINGS/ADVISORIES

TX...None. GM...None.