Port Mansfield, TX to the Rio Grande River Marine Forecast
| Today...Southeast Winds 10 To 15 Knots Becoming East 15 To 20 Knots This Afternoon. Seas 4 To 5 Feet. Wave Detail: Southeast 5 Feet At 8 Seconds. A Chance Of Showers And Thunderstorms. |
| Tonight...Southeast Winds 15 To 20 Knots. Seas 5 To 7 Feet, With Occasional Seas Up To 8 Feet. Wave Detail: Southeast 6 Feet At 7 Seconds. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Sunday...Southeast Winds 10 To 15 Knots. Seas 5 To 7 Feet, With Occasional Seas Up To 8 Feet Subsiding To 4 To 5 Feet In The Afternoon. Wave Detail: Southeast 6 Feet At 8 Seconds Becoming Southeast 5 Feet At 8 Seconds. A Chance Of Showers And Thunderstorms. |
| Sunday Night...Southeast Winds 10 To 15 Knots. Seas 4 To 5 Feet. Wave Detail: Southeast 5 Feet At 7 Seconds. A Slight Chance Of Showers In The Evening. A Slight Chance Of Thunderstorms. Showers Likely After Midnight. |
| Monday...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet. Wave Detail: Southeast 4 Feet At 7 Seconds. Showers Likely In The Morning. A Slight Chance Of Thunderstorms. A Slight Chance Of Showers In The Afternoon. |
| Monday Night...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet. Wave Detail: Southeast 4 Feet At 7 Seconds. Showers With A Chance Of Thunderstorms. |
| Tuesday...Southeast Winds 10 To 15 Knots Decreasing To 5 To 10 Knots In The Afternoon. Seas 3 To 4 Feet. Showers Likely With A Chance Of Thunderstorms. |
| Tuesday Night...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet. Showers Likely With A Chance Of Thunderstorms. |
| Wednesday...South Winds 10 To 15 Knots. Seas 3 To 5 Feet. A Chance Of Thunderstorms In The Morning. A Chance Of Showers. A Slight Chance Of Thunderstorms In The Afternoon. |
| Wednesday Night...South Winds 15 To 20 Knots. Seas 4 To 6 Feet, With Occasional Seas Up To 7 Feet. A Chance Of Showers. A Slight Chance Of Thunderstorms After Midnight. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Brownsville TX 240am CDT Sat Jun 13 2026 ...N Marine .KEY MESSAGES... Updated at 238am CDT Sat Jun 13 2026 - There is a Moderate (level 2 of 4) Heat Risk continues through Sunday and returns again late next week. Heat Advisories may be needed Thursday and Friday. - The National Hurricane Center continues to indicate a low chance (20%) of tropical development with a broad area of low pressure over the Bay of Campeche. - Unsettled weather will continue through at least the middle of next week as deep tropical moisture interacts with an approaching frontal boundary. - There is a moderate risk of life-threatening rip currents at area beaches tonight and will increase to a High Risk this weekend. Increasing swell may result in minor coastal flooding late this weekend into early next week. Issued at 1047pm CDT Fri Jun 12 2026 The dry weather comes to an end Friday night as a westward-moving tropical wave currently located over the Bay of Campeche tracks towards eastern Mexico this weekend. The National Hurricane Center continues to maintain a low chance (20%) of tropical development over the next 48 hours and 7 days. This feature will bring a surge of deep tropical moisture into Deep South Texas later tonight into Saturday. Precipitable water values between 2 to 2.5 inches will support an increase in shower and thunderstorm activity starting early Saturday. There is a medium to high (40 to 80%) chance of showers and thunderstorms on Saturday. However, There remains some uncertainty around timing of showers and thunderstorms. Due to slightly stronger winds aloft (fast storm motion) may result in the rainfall amounts between 0.25 to 0.50 of an inch. However, any showers and thunderstorms will be capable of producing locally heavy rainfall, and isolated amounts upwards of 1 to 2 inches will be possible in any shower or thunderstorm. Rain wanes Saturday night across the region as another round of showers and thunderstorms develops over the Gulf waters and near the coast. Rain chances are moderate to high (30-70%) for Sunday with locally heavy rainfall possible once again. The unsettled weather will continue across the region through at least the middle of next week as the high moisture content remains in place. A 500mb shortwave trough is forecast to swing over the Plains and Texas, pushing a weak cold front across the state Monday into Tuesday before stalling across South Texas Tuesday night into Wednesday. The interaction of the deep tropical airmass with the frontal boundary is expected to bring our best rainfall chances (60 to 80%) for Monday and Tuesday. The latest model guidance continues to indicate the potential for heavy rainfall (2-3+ inches) Monday through Wednesday across portions of the CWA. The Weather Prediction Center has all of Deep South Texas highlighted in a Marginal Risk of Excessive Rainfall for Monday through Tuesday night. Increased cloud cover and rain chances will lead to slightly lower daytime temperatures through the weekend into early next week. However, a Moderate (level 2 of 4) heat risk will continue across much of Deep South Texas through Sunday. Rain chances begin to decrease late Wednesday night into Thursday. The Moderate (level 2 of 4) Heat Risk returns Thursday and a Major (level 3 of 4) Heat Risk will be possible by the end of the week, especially along the coast. Heat Advisories may be needed for portions of Deep South Texas Thursday and Friday. There is a Moderate risk of rip currents at area beaches through at least tonight and will increase to a High Risk this weekend. Hazardous beach conditions, including coastal runup, will be possible as swell increases this weekend with a broad area of low pressure/tropical wave over the Bay of Campeche and eastern Mexico. Marine Issued at 238am CDT Sat Jun 13 2026 Deteriorating marine conditions will continue to take place over the next 24 hours. Adverse (Small Craft Exercise Caution) marine conditions are currently in place over the Gulf Waters. Small Craft Advisory conditions are likely to develop later this afternoon/evening in response to increased winds and waves from an enhanced pressure gradient courtesy of the broad area of low pressure over the Bay of Campeche. Small Craft Advisory conditions is expected to persist to Sunday evening before conditions show gradual improvements thereafter. In addition to the adverse to hazardous marine conditions, showers and thunderstorms will increase in coverage during the day today. Day-to-day chances for showers and thunderstorms will persist through the middle parts of next week. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...High Rip Current Risk from 7am CDT this morning through Sunday evening for TXZ451-454-455. GM...Small Craft Advisory from 1pm this afternoon to 1am CDT Sunday for GMZ130-132-135. Small Craft Advisory from 1pm this afternoon to 7pm CDT Sunday for GMZ150-155-170-175. |
Brownsville TX Radar
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