Marine Weather and Tide Forecast for Lake Arthur, LA

DISCUSSION
(Tonight through next Tuesday)
Issued at 1044 PM CDT Tue Jul 28 2026

Bulk of forecast considerations tonight were taken in by heat indices tomorrow (Wednesday.) The persistence forecast will prevail until tomorrow with the start of a pattern change taking place sometime Thursday. High pressure regime remains in place, and in fact, may be enhanced some on Wednesday. Upper low pressure and trof descend from the northeast US, which lays the framework for later waves to erode upper high pressure. In the meantime, it appears the trof only acts to compress high pressure over the central US, and ultimately increase heights on Wednesday. While this will likely result in slightly higher temps Wed, it will also mean mixing once again. Since the airmass overtop the region mixed out quickly before those advisory-criteria indices really set in, it meant that most of the region stayed at and under 108 today.
Since the same scenario may play out Wed, the bulk of the area was left out of an advisory. Those in Alexandria and along the Atchafalaya may hit 108 to 110, even with mixing, so those areas did get an advisory for the day.

There is the part of the seabreeze pushing in during the early afternoon which may poke heat indices up a skosh, but if it was like today, even that moisture plume could be mixed down quickly.
Unless there is a notable change in presentation or forecast overnight, the advisory will stand as-is. But adjustments may come as deemed necessary.

High pressure will try to hang on into Thursday which may bring about this conversation again, but considering the increase in moisture that's anticipated with the approaching east trof, there could be enough cloud cover to tamp temps down from the needed highs to bring about advisory criteria Thursday to the end of the week.

Residual high will also deflect majority of rain chances to the east until it can back off sometime later Thursday or Friday.

11/Calhoun

AVIATION
(12Z TAFS)
Issued at 631 AM CDT Wed Jul 29 2026

With light winds and clear skies, to go along with a very humid air mass, some patchy fog is occurring at terminals this morning that will last until shortly after sunrise. Otherwise, VFR conditions expected through the day.

07/Rua

MARINE
Issued at 1044 PM CDT Tue Jul 28 2026

Low seas and moderate onshore winds will prevail to the end of the work week as high pressure largely remains in charge. High pressure will begin backing into central Texas late Thursday into Friday, igniting a pressure gradient and increasing easterly winds. This may result in a period of Small Craft Advisory conditions and very likely will signal the return of some rain chances over coastal waters.

FIRE WEATHER
Issued at 1044 PM CDT Tue Jul 28 2026

High pressure will hang on into Wednesday and likely into much of Thursday, continuing the anomalously hot and dry pattern these days. Daytime RH minimums will vary in the 45 to 60 percent range through the end of the week, increasing into the weekend with the return of rain chances.

LCH WATCHES/WARNINGS/ADVISORIES
LA...Heat Advisory from 10 AM this morning to 8 PM CDT this evening for LAZ028-029-032-033-044-045-055-143-152>154-243-252>254.

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