textproduct: Houston/Galveston

KEY MESSAGES

- Hot conditions will continue this week, with potential for heat stress issues as heat indices approach 107F (41-42C) each day.

- A high risk of strong rip currents will continue early this week.

DISCUSSION

Issued at 1212 AM CDT Mon Jun 22 2026

A pattern shift is underway as a midlevel ridge axis begins to build over south and southeast Texas today. This will eliminate the weakness in the ridge that was supporting overnight and morning showers and storms across our area the past few days. There will still be periodic convection passing just north of the area early this week in association with disturbances rounding the longwave upper trough over the central and eastern CONUS. However, the building ridge axis will act as a shield, with storms either redirecting around our area or falling apart as they approach. The first such wave of storms is currently ongoing over northwest OK and will track southeastward into the Red River Valley through the early morning hours. We cannot entirely rule out weakening showers reaching our northern zones around Crockett and Madisonville around mid-morning, but this activity is expected to quickly fall apart. It may, however, make for more high cloud cover today particularly in these areas.

Otherwise, another warm day is on tap with high temps returning to the low to mid 90s (32-34 C) and heat indices in the mid 100s (40-42 C). It's possible a few areas may briefly reach heat advisory criteria today, but for now we aren't expecting that to be widespread enough to post an advisory, especially since high cloud debris spreading in from the north may interfere with daytime insolation in some areas.

Similar weather is anticipated throughout the upcoming week, with hot conditions and minimal rain chances. Additional convective waves may pass just north of our area, but even in our northernmost zones, we still do not have rain chances in the forecast through the week. Though we will have to monitor heat indices each day, there are indications that stronger daytime mixing will occur through at least midweek, which will help mitigate heat stress concerns somewhat.

AVIATION

(00Z TAF Issuance) Issued at 644 PM CDT Sun Jun 21 2026

VFR conditions will remain prevalent at most sites through the evening hours, though MVFR ceilings may impact SGR/LVJ/LBX at times. Ceilings are forecast to lower to MVFR across most terminals by around 05-07Z and persist through early Monday morning before lifting back to VFR after 14-16Z. Winds remain southerly around 10 knots overnight and increase to 10-15 knots with a few gusts over 20 knots during the day Monday.

MARINE

Issued at 1212 AM CDT Mon Jun 22 2026

Strengthening wind overnight resulted in an upgrade to a Small Craft Advisory through the early part of today. However, winds will noticeably decrease this afternoon resulting in calmer conditions throughout our marine areas heading into this evening. Through the remainder of the week, light to moderate onshore flow will prevail with seas mainly 2 to 4 feet.

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 93 78 94 76 / 0 0 0 0 Houston (IAH) 93 79 94 77 / 0 0 0 0 Galveston (GLS) 89 83 89 82 / 0 0 0 0

HGX WATCHES/WARNINGS/ADVISORIES

TX...High Rip Current Risk through this evening for TXZ436>439.

GM...Small Craft Advisory until 1 PM CDT this afternoon for GMZ330- 335-350-355-370-375.