textproduct: Houston/Galveston

KEY MESSAGES

- Hot weather is on tap this week.

- Conditions will be less humid today through Tuesday. Increasing heat index values during the second half of the work week as humidities increase.

- Rain chances will remain slim. Perhaps an isolated shower or two later in the week...but most locations should remain dry.

DISCUSSION

Issued at 1219 AM CDT Sun Jul 19 2026

Ridging, both at the surface and aloft will dominate area weather this week. Today through Tuesday, a dry column of air should remain in place (PW's < 1.5"). This should allow dewpoints to mix out each afternoon and keep RH's and heat indexes in check. That said, with surface high pressure situated in the northwest Gulf, we should start out most days with low level sw winds which will allow temps to heat up fairly quickly - into the mid 90s again today then 95-100F during the work week.

It appears that a portion of the mid level troffiness across the eastern Gulf breaks off and slides under the ridge toward the western Gulf Coast toward midweek. Most deterministic data suggests this axis should be suppressed offshore and along the mid Tx-Mexico coast, but it should bring some higher moisture levels along the northern periphery here locally. It's still worth keeping up with the latest NHC thinking with this area of unsettled wx considering there remains a subset of AI/TC/ensemble guidance suggesting some potential for development. Right now, however, one of the main concerns here in SE Tx looks to be the increased heat indices as PW's/RH's increase Wed-Friday. There may be a non-zero rain chance during this period, though most of us probably won't see anything of significance considering the subsidence aloft.

Heading into the weekend, the mid level ridge to our north further strengthens and H5 heights increase to 594-597dm in our region. So the heat doesn't appear to be leaving us anytime soon. 47

AVIATION

(00Z TAF Issuance) Issued at 611 PM CDT Sat Jul 18 2026

VFR conditions will prevail mostly through the TAF period. TS has not developed this afternoon, and chances are decreasing with the loss of daytime heating. Some MVFR cigs may develop overnight thanks to low-level moisture being trapped under the subsidence inversion. This may also lead to some fog with MVFR vsbys, but confidence is too low to include explicit mention at this time. After sunrise, any MVFR cigs should mix out to VFR by the afternoon. Winds will stay light out of the S/SE tonight around 5 kt, then S/SW Sunday around 5-10 kt.

MARINE

Issued at 1219 AM CDT Sun Jul 19 2026

Favorable marine conditions are anticipated into midweek. Surface high pressure will be situated across the northwest Gulf. Southwest winds late at night and in the mornings should become more southerly in the afternoon and evenings as the seabreeze pushes inland. Speeds will generally be in the 8-15kt range...highest at night in the Gulf, and in the afternoons and evenings in the bays. 47

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 93 72 95 73 / 0 0 0 0 Houston (IAH) 96 74 98 75 / 0 0 0 0 Galveston (GLS) 91 80 91 80 / 0 0 0 0

HGX WATCHES/WARNINGS/ADVISORIES

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