Port Mansfield, TX to the Rio Grande River 20 - 60 NM Marine Forecast
| Today...Southeast Winds Around 5 Knots, Becoming East This Afternoon. Seas 2 To 3 Feet. Wave Detail: East 2 Feet At 6 Seconds. |
| Tonight...Southeast Winds 5 To 10 Knots, Becoming South 10 To 15 Knots After Midnight. Seas 2 To 3 Feet. Wave Detail: South 2 Feet At 3 Seconds And East 2 Feet At 7 Seconds. |
| Friday...South Winds Around 10 Knots. Seas 2 To 4 Feet. Wave Detail: South 2 Feet At 4 Seconds And East 2 Feet At 7 Seconds. |
| Friday Night...South Winds 10 To 15 Knots. Seas 2 To 4 Feet. Wave Detail: South 3 Feet At 4 Seconds And East 2 Feet At 7 Seconds. |
| Saturday...South Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 3 Feet At 6 Seconds. |
| Saturday Night...South Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 6 Seconds. |
| Sunday...North Winds 15 To 20 Knots, Increasing To 20 To 25 Knots In The Afternoon. Seas 2 To 3 Feet, Building To 4 To 6 Feet, Occasionally To 8 Feet In The Afternoon. A Slight Chance Of Showers And Thunderstorms. |
| Sunday Night...North Winds 20 To 25 Knots With Gusts Up To 30 Knots. Seas 7 To 10 Feet, Occasionally To 13 Feet, Building To 9 To 11 Feet, Occasionally To 14 Feet After Midnight. |
| Monday...North Winds 20 To 25 Knots With Gusts Up To 30 Knots, Becoming Northeast 15 To 20 Knots In The Afternoon. Seas 8 To 11 Feet, Occasionally To 14 Feet, Subsiding To 6 To 9 Feet, Occasionally To 11 Feet In The Afternoon. |
| Monday Night...Northeast Winds 10 To 15 Knots, Becoming East After Midnight. Seas 5 To 7 Feet, Occasionally To 9 Feet, Subsiding To 4 To 5 Feet After Midnight. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service Brownsville TX 1144am CST Thu Nov 6 2025 Issued at 1128am CST Thu Nov 6 2025 The forecast remains largely unchanged as ridging aloft remains over Deep South Texas, maintaining mainly clear skies and dry conditions through next Thursday. Southeasterly onshore to southerly winds today continue to advect moisture inland through Saturday, courtesy of surface high pressure over the Gulf and southern US. As winds become light and variable to calm overnight tonight, there is the possibility of patchy fog, especially across the northern ranchlands and west of US-281/I-69 C. Upstream, a robust ridge aloft arriving over the Pacific Northwest tonight pushes a mid/upper level shortwave over the Rockies tomorrow with a cold front attached to a surface low pressure developing over the Central Plains on Saturday, moving southward through our County Warning Area (CWA) on Sunday as a trough deepens across the eastern CONUS. Due to the tight pressure gradient developing along this front, a strong high pressure across the Plains will result in breezy north-northeasterly winds, gusting up to 25-30 mph, region-wide behind the front, advecting much drier air into the region on Sunday, thus crashing relative humidity values to as low as the lower 20's on Sunday and the lower teens on Monday (lowest out west both days) with breezy conditions persisting closer to the coast. The combination of such low relative humidity values and breezy conditions continues to draw attention to fire weather concerns, focused on the northern ranchlands and possibly the middle and upper Rio Grande Valley on Sunday and across portions of the coastal counties on Monday; Fire Danger Statements are possible. Temperature wise, a warming trend will increase highs from the upper 80's and lower 90's today to mainly lower to mid 90's on Friday and Saturday, with near record breaking temperatures possible as highs soar to 10-15 degrees F above average. A Minor (level 1 of 4) HeatRisk is expected across most of Deep South Texas today, tomorrow and Saturday. As the front passes through on Sunday, temperatures fall from near average on Sunday, with 80's, to 10-15 degrees F below average on Monday, with 60's and 70's. Another warming trend ensues Tuesday into the later parts of next week as ridging across the western US and surface high across the southern US result in southeasterly winds again. A low risk of rip currents continues through the day tomorrow though dangerous swimming conditions and impacts to the Lower Texas coastal and marine areas are expected Sunday and into the beginning of next week as strong winds over the Gulf results in high surf as well as strong rip and longshore currents. Marine Issued at 1128am CST Thu Nov 6 2025 Mostly gentle southeasterly winds and slight (1-2 ft) seas today become moderate southerly winds with slight to moderate (2-3 ft) seas tonight through Saturday night. Late Saturday night into early morning Sunday, winds shift out of the north as a cold front passes southward through the Lower Texas coastal waters. Small Craft Advisory headlines are likely on Sunday and Monday as a tight pressure gradient enhances north-northeasterly winds to strong to near-gale by Sunday afternoon, persisting into Monday, resulting in moderate to rough seas. Conditions improve Monday night into Tuesday with moderate to fresh southeasterly winds and moderate seas resulting in periods of Small Craft Exercise Caution conditions possibly into the later part of next week. NOAA Brownsville TX Office: Watches - Warnings - Advisories TX...None. GM...None. |
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