textproduct: Houston/Galveston

KEY MESSAGES

- A strong heat dome over the Southwest will keep conditions dry, with temperatures well above average through the weekend and persisting into next week.

- Persistent southerly flow will lead to daily opportunities for fog and low clouds, at least through early next week.

DISCUSSION

Issued at 200 PM CDT Sat Mar 21 2026

The primary weather stories for the weekend and the upcoming week remain centered on unseasonably warm temperatures, persistent dry conditions and periods of morning fog.

A strong heat dome of high pressure centered over the southwestern CONUS and a surface high to our east continue to be the main drivers of our local weather. Well-above normal temperatures are on tap for the region this afternoon, with highs reaching the upper 80s to low 90 across our far western counties (Brazos Valley area).

Persistent light southerly flow and low-level Gulf moisture will lead to another round of patchy-to-areas of fog and low to mid level clouds tonight into early Sunday. Some fog may be locally dense at times. With the ridge remaining firmly in place, Sunday is expected to be another hot and breezy day once the morning fog burns off.

The southwestern CONUS ridge is expected to weaken slightly late Sunday into Monday. This is in response to a weak, dry cool front attempting to backdoor into the area while a mid-upper level low moves over the northwestern Gulf. No significant impacts are expected with the FROPA and/or upper-lvl low. Expect temperatures to drop perhaps a degree or two, with the only potential for rain being a few light showers well offshore.The aforementioned high pressure will strengthen and expand eastward. This will reinforce a pattern of dry, hot and humid conditions through the remainder of the forecast period.

With southerly flow maintaining surface moisture, morning fog remains a recurring concern. Current model guidance suggests low probabilities for reduced visibility for tonight (15 to 20%), medium probabilities (25-45%) for early Monday.

AVIATION

(12Z TAF Issuance) Issued at 631 AM CDT Sat Mar 21 2026

MVFR ceilings and vis at a couple terminals this morning, but thanks to the slightly elevated winds there has not been much in the way of fog. Conditions will improve even further after sunrise with any light fog around burning off. The winds will stick around today, with a few gusts around 20kts possible at most terminals around mid day into early afternoon. Very similar conditions can be expected tonight into early Sunday with winds remaining slightly elevated once again.

MARINE

Issued at 200 PM CDT Sat Mar 21 2026

Light to moderate onshore winds (SSW to SSE) winds will prevail this weekend and into the rest of the upcoming week. A weak upper-level disturbance will be moving across the northwestern Gulf early this week, as surface high pressure slightly shifts eastward into Florida. No significant impacts are expected with this low, other than a few light showers well-offshore on Monday. High pressure reestablishes again through the week, keeping the upper TX coast dry, with light to occasionally moderate winds and seas with from 2 to 4 ft.

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 89 61 88 59 / 0 0 0 0 Houston (IAH) 88 64 87 63 / 0 0 0 0 Galveston (GLS) 76 66 75 66 / 0 0 0 0

HGX WATCHES/WARNINGS/ADVISORIES

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