Marine Weather Net

Port Mansfield, TX to the Rio Grande River Marine Forecast


10 - 15


15 - 20


15 - 20


15 - 20

The Marine Weather Forecast In Detail:
GMZ150 Forecast Issued: 352 AM CDT Thu Mar 30 2023

Today...Southeast Winds 10 To 15 Knots. Seas 4 To 5 Feet.
Tonight...Southeast Winds 15 To 20 Knots. Seas 4 To 5 Feet.
Friday...South Winds 15 To 20 Knots. Gusts To 30 Knots In The Afternoon. Seas 5 To 7 Feet, With Occasional Seas Up To 8 Feet.
Friday Night...Southeast Winds 15 To 20 Knots Decreasing To 5 To 10 Knots After Midnight. Seas 3 To 5 Feet.
Saturday...East Winds 5 To 10 Knots. Seas 3 To 4 Feet.
Saturday Night...East Winds 10 To 15 Knots. Seas 3 To 4 Feet.
Sunday...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet.
Sunday Night...Southeast Winds Around 15 Knots. Seas 3 To 5 Feet.
Monday...South Winds 10 To 15 Knots Becoming Southeast 15 To 20 Knots In The Afternoon. Seas 3 To 5 Feet.
Monday Night...Southeast Winds 15 To 20 Knots. Seas 4 To 5 Feet.
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Area Forecast Discussion
National Weather Service Brownsville TX
406am CDT Thu Mar 30 2023

.SHORT TERM... (Today through Friday) Issued at 403am CDT Thu Mar 30 2023

Thin line of precipitation over the coastal counties is accompanying the warm front as it continues to lift north. Due to the drizzle and abundance of moisture occurring over the coast, patchy fog has formed over Jim Hogg, Brooks, Kenedy, Willacy, Hidalgo, and Cameron counties as well as the barrier island. Visibilities have generally stayed near 2 to 3 SM, but have occasionally dropped below 1 SM. A Special Weather Statement has been issued until 6am CDT.

Today, high pressure builds over the Gulf of Mexico which may give the CWA (County Warning Area) a break in the cloudy weather. Model soundings show overcast skies breaking up into scattered skies this afternoon. Highs will reach the lower 80s and have a possibility of overachieving depending on cloud cover later today. Southeasterly winds become breezy around 25 mph this afternoon as well. Tonight, cloudy skies return and lows stay in the upper 60s to lower 70s.

Friday's highs were a bit tricky and also dependent on cloud cover and timing of the cold front. So far, models are still consistent in showing a cold front moving through Deep South Texas by Friday night. However, winds become breezy ahead of the front during the day. Winds speeds should stay under Wind Advisory criteria but a Special Weather Statement may be needed for gusts to 35 mph especially in the lower RGV. NBM has clouds clearing north to south tomorrow which will cause a bit of a temperature spread in daytime highs. Have Northern Ranchlands in the mid 90s while the Rio Grande Valley is forecast to stay in the lower 90s and BRO in the upper 80s.

Long Term
(Friday night through Wednesday) Issued at 403am CDT Thu Mar 30 2023

A sharp, positive tilt 500 mb trough will dig south from the Pacific Northwest into the High Plains on Friday. This feature will drive a storm system into the upper Midwest. The models have been reasonably consistent with bringing the tail end of an associated cold front into Texas Friday, stalling and stretching it northeast to southwest over the CWA Friday night and Saturday. Moisture with the front appears to be limited but a few showers and thunderstorms could materialize over the upper Valley and Ranchlands Saturday afternoon. Moisture could become a little better focused once return flow takes hold on Saturday and the front begins to retreat north. However, convection chances by that time will be primarily limited to north of the CWA.

A low latitude short wave trough will move across the desert Southwest and Texas Saturday night and Sunday with little local effect. Then, another sharp, positive tilt mid-level short wave trough will dig south into the Great Basin area next Monday and Tuesday, generating another storm system over the central to northern High Plains and upper Midwest, and supporting locally breezy southeast return flow. An associated cold front will push south to the CWA on Wednesday, again not having quite enough energy to push all the way through. Rain chances will increase next Wednesday and Thursday as the front stalls over the CWA.

We will start to see more and more high temperatures in the 90s during the long term. One exception will be on Saturday when highs will be held down in the 80s with the stalled front in the neighborhood. Temperatures will warm into the 90s with a few century marks Sunday through Tuesday. Again next Wednesday the second front will push into the area, holding high temperatures down in the 90s, and into the 80s on Thursday.

Issued at 403am CDT Thu Mar 30 2023

Today through Thursday...Light showers are occurring over the Laguna Madre and nearshore Gulf Waters (0-20nm) due to the presence of a warm front lifting north. Warm air advection has aided in the formation of patchy fog over the Laguna Madre and nearshore waters. Have a Marine Weather Statement in effect until 6am CDT for patchy fog lowering visibilities down to 1 to 3 nm. Offshore seas (20-60nm) have also stayed elevated through the night around 7 to 8 ft. Therefore, extended the Small Craft Advisory out until 1pm CDT for the offshore waters for elevated seas. Though, this SCA (Small Craft Advisory) may need to be extended due to gusty southeasterly winds later today.

Friday night through Monday night...Winds will briefly decrease Friday night through Saturday as a cold front hangs up just upstream. Moderate southeast winds and moderate seas will occur again Saturday night through Monday night as return flow becomes reestablished.

NOAA Brownsville TX Office: Watches - Warnings - Advisories
TX...High Rip Current Risk until 7am CDT this morning for TXZ451-454- 455.

GM...Small Craft Advisory until 1pm CDT this afternoon for GMZ170- 175.