LIX upgrades Tropical Storm Watch to Tropical Storm Warning for Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm, Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya River LA from 20 to 60 NM, Lake Pontchartrain, Lake Salvador and Lake Cataouatche, Terrebonne Bay [GM] until further notice
887
WHUS74 KLIX 212119
MWWLIX
URGENT - MARINE WEATHER MESSAGE
National Weather Service New Orleans LA
419 PM CDT Tue Jul 21 2026
GMZ531-533-541-551-570-221130-
/O.UPG.KLIX.TR.A.1002.000000T0000Z-000000T0000Z/
/O.EXA.KLIX.TR.W.1002.000000T0000Z-000000T0000Z/
Lake Pontchartrain-Lake Salvador and Lake Cataouatche-
Terrebonne Bay-
Coastal Waters from Port Fourchon LA to Lower Atchafalaya River
LA out 20 nm-
Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya
River LA from 20 to 60 NM-
419 PM CDT Tue Jul 21 2026
...TROPICAL STORM WARNING IN EFFECT...
* WHAT...Southwest winds 25 to 35 kt with gusts up to 55 kt and
seas 7 to 10 ft.
* WHERE...Lake Pontchartrain, Lake Salvador and Lake Cataouatche,
Terrebonne Bay, Coastal Waters from Port Fourchon LA to Lower
Atchafalaya River LA out 20 to 60 Nautical Miles.
* WHEN...Tropical Storm force winds possible from Wednesday
afternoon until early Thursday morning.
* IMPACTS...Tropical storm force winds and hazardous seas will
capsize or damage vessels and reduce visibility.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.
&&
$$
GMZ532-534>536-543-553-554-557-572-575-577-221130-
/O.CON.KLIX.TR.W.1002.000000T0000Z-000000T0000Z/
Mississippi Sound-Lake Borgne-Breton Sound-Chandeleur Sound-
Barataria Bay-
Coastal Waters from Southwest Pass of the Mississippi River to
Port Fourchon LA out 20 nm-
Coastal Waters from Boothville LA to Southwest Pass of the
Mississippi River out 20 nm-
Coastal waters from Pascagoula Mississippi to Stake Island out
20 NM-
Coastal waters from Southwest Pass of the Mississippi River to
Port Fourchon Louisiana from 20 to 60 NM-
Coastal Waters from Stake Island LA to Southwest Pass of the
Mississippi River from 20 to 60 nm-
Coastal waters from Pascagoula Mississippi to Stake Island
Louisiana out 20 to 60 NM-
419 PM CDT Tue Jul 21 2026
...TROPICAL STORM WARNING REMAINS IN EFFECT...
* WHAT...Southwest winds 30 to 40 kt with gusts up to 55 kt and
seas 8 to 13 ft.
* WHERE...Portions of the Gulf including Lake Borgne, Breton
Sound, Chandeleur Sound.
* WHEN...Tropical Storm force winds possible until Wednesday
afternoon.
* IMPACTS...Tropical storm force winds and hazardous seas will
capsize or damage vessels and reduce visibility.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.
&&
$$
GMZ529-221130-
/O.CON.KLIX.TR.A.1002.000000T0000Z-000000T0000Z/
Lake Maurepas-
419 PM CDT Tue Jul 21 2026
...TROPICAL STORM WATCH REMAINS IN EFFECT...
* WHAT...Southwest winds 15 to 25 kt with gusts up to 30 kt.
* WHERE...Portions of the Gulf south and west of Port Fourchon
including Terrebonne Bay.
* WHEN...Tropical Storm force winds possible until Wednesday night.
* IMPACTS...Tropical storm force winds and hazardous seas could
capsize or damage vessels and reduce visibility.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Mariners should consider altering plans to avoid possible
hazardous conditions. Remain in port, seek safe harbor, alter
course, and/or secure the vessel for severe wind and seas.
&&
$$
Source: LIX upgrades Tropical Storm Watch to Tropical Storm Warning for Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm, Coastal waters from Port Fourchon Louisiana to Lower Atchafalaya River LA from 20 to 60 NM, Lake Pontchartrain, Lake Salvador and Lake Cataouatche, Terrebonne Bay [GM] until further notice (https://mesonet.agron.iastate.edu/vtec/f/2026-O-EXA-KLIX-TR-W-1002_2026-07-21T21:19Z)
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