National Weather Service Marine Forecast FZNT27 KNHC

FZNT27 KNHC 212100
OFFN06

NAVTEX Marine Forecast
NWS National Hurricane Center Miami, FL
500 PM EDT Tue Jul 21 2026

Please refer to Coastal Waters Forecasts (CWF) available through NOAA Weather Radio and other means for detailed Coastal Waters Forecasts

SYNOPSIS
Tropical Storm Bertha is near 29.4N 87.2W at 5 PM EDT, and is moving northwest at 5 kt. Maximum sustained winds are 50 kt with gusts to 60 kt, and the minimum central pressure is 995 mb. Bertha will weaken slightly as it moves toward southeast Louisiana overnight, reaching 29.6N 87.9W by Wed morning, 29.5N 89.3W by Wed afternoon, and 29.3N 91.4W by Thu morning. Bertha will weaken further as it moves along the coast of Louisiana, reaching 29.4N 93.4W Thu afternoon, then moving inland and weakening to a tropical depression near 29.8N 95.6W by Fri morning. The remnant low of Bertha will continue inland reaching 30.3N 97.6W by Fri afternoon. Bertha will dissipate Sat afternoon. Swells generated by Bertha are affecting portions of the Gulf coast of Florida and are likely to spread westward during the rest of the week. Elsewhere, weak high pressure over the western Gulf will dissipate by midweek. After midweek, Atlantic high pressure will extend westward to the central Gulf following Bertha.

Northwest Gulf of America

TROPICAL STORM WARNING

TONIGHT
SW to W winds 20 to 25 kt. Seas 3 to 5 ft. Scattered showers and isolated tstms.

WED
TROPICAL STORM CONDITIONS POSSIBLE. SW to W winds 20 to 30 kt. Seas 3 to 5 ft. Scattered tstms.

WED NIGHT
TROPICAL STORM CONDITIONS EXPECTED. SW winds 30 to 40 kt. Seas 4 to 6 ft. Scattered tstms.

THU
TROPICAL STORM CONDITIONS POSSIBLE. SW winds 30 to 35 kt, becoming S to SW 20 to 25 kt in the afternoon. Seas 4 to 6 ft. Scattered showers and isolated tstms.

THU NIGHT
S winds 20 to 25 kt. Seas 3 to 5 ft.

FRI
S winds 10 to 15 kt. Seas 3 to 4 ft.

FRI NIGHT
SE to S winds 15 to 20 kt. Seas 3 to 4 ft.

SAT
SE to S winds 10 to 15 kt. Seas 3 to 4 ft.

SAT NIGHT
SE to S winds 10 to 15 kt. Seas 3 ft.

SUN
S winds 10 to 15 kt. Seas 3 ft in the morning, subsiding to 2 ft or less.

North Central and Northeast Gulf of America

TROPICAL STORM WARNING

TONIGHT
TROPICAL STORM CONDITIONS. SW winds 40 to 45 kt. Seas 8 to 13 ft. Scattered showers and isolated tstms.

WED
TROPICAL STORM CONDITIONS EXPECTED. S to SW winds 35 to 45 kt. Seas 8 to 11 ft. Scattered showers and isolated tstms.

WED NIGHT
TROPICAL STORM CONDITIONS EXPECTED. S to SW winds 35 to 40 kt, diminishing to 25 to 30 kt after midnight. Seas 7 to 10 ft.

THU
S winds 20 to 25 kt. Seas 5 to 7 ft.

THU NIGHT
S winds 10 to 15 kt. Seas 4 to 6 ft.

FRI
SE to S winds 10 to 15 kt. Seas 3 to 4 ft.

FRI NIGHT
SE to S winds 5 to 10 kt. Seas 3 ft.

SAT
SE to S winds 5 to 10 kt. Seas 2 ft or less.

SAT NIGHT
S to SW winds 10 to 15 kt. Seas 2 ft or less.

SUN
W winds 10 to 15 kt. Seas 2 ft or less.