San Martin Lake Channel, TX Coastal Forecast

FZUS54 KBRO 210546
CWFBRO

Coastal Waters Forecast for the Lower Texas Coast
National Weather Service Brownsville TX
1246 AM CDT Sat Mar 21 2026

Lower Texas coastal waters from Baffin Bay to the mouth of the
Rio Grande out 60 NM.

Seas are provided as a range of the average height of the highest
1/3 of the waves, along with the occasional height of the average
highest 10 percent of the waves.

GMZ100-211830-
1246 AM CDT Sat Mar 21 2026

.SYNOPSIS...Light to moderate winds and low to moderate seas will
prevail along the Lower Texas Coast with high pressure in control.
Although Small Craft Advisory is not likely to be needed, Small
Craft Should Exercise Caution may occasionally be needed, mainly
due to winds.

$$

GMZ130-132-135-211830-
Laguna Madre from the Port of Brownsville to the Arroyo Colorado-
Laguna Madre from the Arroyo Colorado To 5 NM north of Port
Mansfield TX-
Laguna Madre from 5 nm north of Port Mansfield to Baffin Bay TX-
1246 AM CDT Sat Mar 21 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION...

.TODAY...South winds 10 to 15 knots, becoming southeast early
this afternoon, then increasing to 15 to 20 knots late this
afternoon. A moderate chop on the bay, increasing to choppy bay
waters late this afternoon.
.TONIGHT...South winds 10 to 15 knots. A moderate chop on the
bay.
.SUNDAY...South winds 10 to 15 knots, becoming southeast 15 to
20 knots late in the afternoon. A moderate chop on the bay,
increasing to choppy bay waters late in the afternoon.
.SUNDAY NIGHT...Southeast winds 15 to 20 knots, becoming south
5 to 10 knots. Choppy bay waters, diminishing to a light chop on
the bay.
.MONDAY...Southeast winds 5 to 10 knots, increasing to 10 to
15 knots in the afternoon. A moderate chop on the bay.
.MONDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to
5 to 10 knots after midnight. A light chop on the bay.
.TUESDAY...Southeast winds 5 to 10 knots, increasing to 10 to
15 knots in the afternoon. A moderate chop on the bay.
.TUESDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to
5 to 10 knots early in the morning. A moderate chop on the bay,
diminishing to a light chop on the bay early in the morning.
.WEDNESDAY...South winds 5 to 10 knots, becoming southeast 10 to
15 knots in the afternoon. A moderate chop on the bay.
.WEDNESDAY NIGHT...Southeast winds 10 to 15 knots. A moderate
chop on the bay.

$$

GMZ150-155-211830-
Gulf waters from Port Mansfield to the Rio Grande out 20 nm-
Gulf waters from Baffin Bay to Port Mansfield out 20 nm-
1246 AM CDT Sat Mar 21 2026

.TODAY...South winds 10 to 15 knots, becoming around 15 knots
late this afternoon. Seas 2 to 4 feet. Wave Detail: Southeast
3 feet at 6 seconds.
.TONIGHT...South winds 10 to 15 knots. Seas 3 to 4 feet. Wave
Detail: Southeast 3 feet at 6 seconds.
.SUNDAY...South winds 10 to 15 knots. Seas 3 to 4 feet. Wave
Detail: Southeast 3 feet at 6 seconds.
.SUNDAY NIGHT...Southeast winds 10 to 15 knots. Seas 2 to 4 feet.
Wave Detail: Southeast 3 feet at 6 seconds.
.MONDAY...Southeast winds 5 to 10 knots, becoming around 10 knots
late in the afternoon. Seas 2 to 3 feet. Wave Detail: Southeast
2 feet at 6 seconds.
.MONDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 3 feet.
Wave Detail: Southeast 3 feet at 6 seconds.
.TUESDAY...Southeast winds 5 to 10 knots, increasing to 10 to
15 knots late in the afternoon. Seas 2 to 3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 2 to
3 feet.
.WEDNESDAY...Southeast winds 10 to 15 knots. Seas 2 to 3 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to
4 feet.

$$

GMZ170-175-211830-
Gulf waters from Port Mansfield to the Rio Grande extending from
20 to 60 nm-
Gulf waters from Baffin Bay to Port Mansfield extending from
20 to 60 nm-
1246 AM CDT Sat Mar 21 2026

.TODAY...South winds 10 to 15 knots. Seas 3 to 4 feet. Wave
Detail: Southeast 3 feet at 6 seconds.
.TONIGHT...South winds 10 to 15 knots. Seas 3 to 4 feet. Wave
Detail: Southeast 3 feet at 6 seconds.
.SUNDAY...South winds 10 to 15 knots. Seas 3 to 4 feet. Wave
Detail: Southeast 3 feet at 6 seconds.
.SUNDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet.
Wave Detail: Southeast 3 feet at 6 seconds.
.MONDAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet. Wave
Detail: Southeast 3 feet at 6 seconds.
.MONDAY NIGHT...Southeast winds around 10 knots. Seas 3 to
4 feet. Wave Detail: Southeast 3 feet at 6 seconds.
.TUESDAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet.
.TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to
4 feet.
.WEDNESDAY...Southeast winds around 10 knots. Seas 3 to 4 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to
4 feet.

$$