textproduct: Houston/Galveston

KEY MESSAGES

- Heat advisory for most of the area again today. Peak heat indicies of 106-109F expected.

- Temperatures should remain 4-7 degrees above seasonable norms most of the week. - Chances of isolated to scattered storms will remain in the forecast, though locations closer to the coast will generally see higher chances than those in the Brazos Valley and Piney Woods.

DISCUSSION

Issued at 1216 AM CDT Sun Sep 13 2026

Weather pattern isn't all that much different than yesterday except we should see some higher PW's (2.0-2.2") push inland to, or slightly north, of the I-10 corridor which should lead to some widely scattered to scattered precip as the day progresses. Taking a look at yesterday's peak heat index readings, a good portion of the region saw values between 107-110F. Current dewpoints between 76-80F will be slow to mix out, so suspect we might see similar values again today. Went ahead and issued another Heat Advisory from 11am- 6pm taking this into account. Southern parts of the area might not see indexes that high should precip develop earlier than fcst, however.

Otherwise, mid-upper ridging generally centered across the Red River will track eastward into the Tennessee Valley and strengthen heading into midweek. Portions of a trof moving off the northeastern US coast will cutoff then sag south, then west, toward Florida essentially nudging the weakening ridge back toward Texas later in the week. What does all this mean...not too much actually - other than the wx will remain pretty much status quo. Continued warm/hot with highs in the 90s, lows in the 70s, and daily chances of showers/storms across southern parts of the CWA. Overall coverage/chances will be dependent on fluctuations of moisture/PW's. At this time, it looks like we'll see a surge in PW's heading toward the western Gulf Coast Wednesday night and Thursday...but there is a chance this mostly bypasses most of the region to the south.

Looking ahead, there have been some indications (maybe sometime between Sept 20-22) that we *might* be able to get a weak front slide into the area...possibly bringing temps back closer to seasonal norms. 47

AVIATION

(06Z TAF Issuance) Issued at 1216 AM CDT Sun Sep 13 2026

Cloud decks will lower to around 1500-2000ft overnight, and could briefly fill in to produce MVFR CIGS early Sunday morning. Isolated patchy fog will also be possible at fog prone locations like KCXO. CIGs/Fog should clear around or by the late morning hours. Diurnally driven showers/storms will be possible on Sunday, mainly over the coast during the morning, then inland during the afternoon. Overall chances for showers/storms look slightly better on Sunday compared to Saturday. Any convection that does develop should tapper off into Sunday evening, while winds becoming light once again.

03

MARINE

Issued at 1216 AM CDT Sun Sep 13 2026

Light to moderate onshore winds and 2-4 foot seas will prevail for the next several days. Look for some late night through early afternoon widely scattered showers and thunderstorms on a daily basis. Heading into late Wednesday and Thursday, we should see a 3 to 5 foot easterly swell arrive along the upper Texas coast. Higher wind speeds are anticipated in the far offshore waters during this time period as well. 47

PRELIMINARY POINT TEMPS/POPS

College Station (CLL) 99 76 97 76 / 20 20 20 20 Houston (IAH) 95 78 94 78 / 30 10 30 20 Galveston (GLS) 92 83 91 83 / 30 0 20 10

HGX WATCHES/WARNINGS/ADVISORIES

TX...Heat Advisory from 11 AM this morning to 6 PM CDT this evening for TXZ163-164-176>179-195>200-210>213-226-227-235>237-335.

GM...None.