Laguna Madre from the Arroyo Colorado to Port Mansfield, TX Marine Forecast
|Today...Southeast Winds 10 To 15 Knots. A Moderate Chop On The Bay. Slight Chance Of Showers And Thunderstorms.|
|Tonight...Southeast Winds 5 To 10 Knots. A Light Chop On The Bay. Slight Chance Of Showers And Thunderstorms.|
|Saturday...Southeast Winds 5 To 10 Knots Becoming Southwest 10 To 15 Knots In The Afternoon. A Light Chop On The Bay Building To A Moderate Chop On The Bay In The Afternoon. Showers And Thunderstorms Likely.|
|Saturday Night...Northwest Winds 15 To 20 Knots. Choppy Bay Waters. Chance Of Showers And Thunderstorms In The Evening, Then Slight Chance Of Rain Showers After Midnight.|
|Sunday...Northwest Winds 15 To 20 Knots. Choppy Bay Waters.|
|Sunday Night...North Winds 15 To 20 Knots. Choppy Bay Waters.|
|Monday...North Winds 10 To 15 Knots. A Moderate Chop On The Bay.|
|Monday Night...North Winds 10 To 15 Knots Diminishing To 5 To 10 Knots After Midnight. A Moderate Chop On The Bay Subsiding To A Light Chop On The Bay After Midnight.|
|Tuesday...North Winds Around 5 Knots Becoming Southeast In The Afternoon. A Light Chop On The Bay.|
|Tuesday Night...South Winds 5 To 10 Knots. A Light Chop On The Bay.|
| Synopsis for Baffin Bay to Rio Grande out 60 nm: GMZ100|
350 AM CST Fri Nov 27 2020
Favorable marine conditions will occur until the passage of a cold front this weekend, with stronger winds and rougher seas in the wake of the front. Lighter winds and lower seas will return for early next week.
| Area Forecast Discussion|
...UPDATED National Weather Service Brownsville TX
531am CST Fri Nov 27 2020
Short Term - Now through Saturday
The most significant weather event during this portion of the forecast will be the slow approach and passage of a cold front. Gradually increasing chances of showers and thunderstorms will accompany the passage of this front. Well above normal temperatures today will moderate from west to east tonight and especially on Saturday. With the slow transition of the cold front from west to east, a large gradient in temperatures within Deep South Texas and the Rio Grande Valley is probable for tonight and tomorrow.
Long Term - Saturday Night through Thursday
The latest GFS/ECMWF are in fairly good agreement with a 500mb low over north Texas Saturday night and over the ArkLaTex region on Sunday. At the surface, the associated strong cold front is expected to have pushed off the lower Texas coast at the start of the long term. Ongoing rain chances will quickly end from west to east Saturday night with a few lingering showers possible across the Gulf waters Sunday morning. Otherwise, much drier air will filter into deep south Texas Saturday night and Sunday as cold air advection continues. Low temperatures Sunday morning should range from the upper 40s across the northern ranchlands to the mid to upper 50s near the coast. Sunday will be mild with highs in the upper 60s to lower 70s with mostly sunny skies. Low temperatures Monday morning are expected to fall into the 40s at most locations.
A reinforcing surge of surface high pressure arrives on Monday resulting in another push of cooler air and stronger north winds. The 1027mb surface high pressure builds across Texas on Monday and Monday night before moving east across the northern Gulf coast on Tuesday. High temperatures on Monday will be in the 60s with breezy north winds. Light winds and mostly clear skies will allow temperatures to drop into the mid 30s across the northern ranchlands in 40s across the lower Rio Grande Valley Tuesday morning. Highs on Tuesday are expected to reach the mid to upper 60s to around 70. Temperatures gradually warm Tuesday night into Wednesday as southeast flow develops. A slight chance of rain returns Wednesday night and Thursday as another cold front moves into the area.
MARINE (Now through Saturday): Generally moderate winds and seas are forecast along the Lower Texas Coast as a cold front approaches from the west. Small Craft Exercise Caution and Small Craft Advisory are not expected to be needed during this portion of the marine forecast.
Saturday Night through Thursday: A strong cold front is expected to move through the lower Texas coastal waters Saturday night. Hazardous marine conditions with strong north winds and building seas will develop in the wake of the front. Small Craft Advisories will be likely Saturday night through Monday night on the Gulf waters. Conditions briefly improve Tuesday into Tuesday night as high pressure settles across the western Gulf. Another cold front is expected to move into the coastal waters around midweek. Adverse conditions will develop along the lower Texas coast Wednesday night into Thursday.
NOAA Brownsville TX Office: Watches - Warnings - Advisories