Marine Weather Net

Baffin Bay to Port Mansfield, TX 20 - 60 NM Marine Forecast


REST OF TONIGHT

S
WINDS
10 - 15
KNOTS

MONDAY

S
WINDS
15 - 20
KNOTS

MONDAY NIGHT

N
WINDS
25 - 30
KNOTS

TUESDAY

N
WINDS
15 - 25
KNOTS

The Marine Weather Forecast In Detail:
GMZ175 Forecast Issued: 936 PM CDT Sun Sep 27 2020

GALE WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY AFTERNOON
Rest Of Tonight...South Winds 10 To 15 Knots. Seas 2 To 4 Feet.
Monday...South Winds 15 To 20 Knots Becoming North 20 To 25 Knots In The Afternoon. Seas 3 To 5 Feet. Scattered Showers And Thunderstorms.
Monday Night...North Winds 25 To 30 Knots Diminishing To 20 To 25 Knots After Midnight. Seas 7 To 11 Feet With Occasional Seas Up To 13 Feet. Isolated Showers And Thunderstorms.
Tuesday...North Winds 15 To 25 Knots Becoming 15 To 20 Knots In The Afternoon. Seas 6 To 9 Feet With Occasional Seas Up To 10 Feet.
Tuesday Night...North Winds 15 To 20 Knots Diminishing To 10 To 15 Knots After Midnight. Seas 4 To 6 Feet With Occasional Seas Up To 7 Feet.
Wednesday...North Winds 5 To 10 Knots. Seas 2 To 4 Feet.
Wednesday Night...East Winds Around 5 Knots Shifting Southeast After Midnight. Seas 2 To 3 Feet.
Thursday...East Winds Around 5 Knots Becoming Northeast In The Afternoon. Seas 2 To 3 Feet.
Thursday Night...East Winds 5 To 10 Knots. Seas 2 To 3 Feet.
Friday...Northeast Winds 5 To 10 Knots. Seas 2 To 3 Feet.
Friday Night...East Winds 5 To 10 Knots. Seas 2 To 4 Feet.
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Synopsis for Baffin Bay to Rio Grande out 60 nm: GMZ100
936 PM CDT Sun Sep 27 2020

light to moderate winds and low to moderate seas will continue tonight prior to the arrival of a cold front late Monday morning into Monday afternoon. The front will bring strong northerly winds and build seas into Tuesday. Adverse marine conditions will prevail through Tuesday night, with improvement Wednesday through the end of the forecast period. Small Craft Advisories are likely needed Monday through Tuesday. Gale force winds are possible.
Area Forecast Discussion
...UPDATED National Weather Service Brownsville TX
1239am CDT Monday September 28 2020

AVIATION...VFR conditions with clear skies continue through late tonight. Breezy southeasterly winds gradually diminish this evening, becoming light near daybreak Monday. A cold front advances south through the Rio Grande Valley late Monday morning into Monday afternoon, with strong gusty northerly winds behind the front through the afternoon. There may be patchy fog near daybreak, and isolated thunderstorms are possible along and just behind the frontal passage into Monday evening. Confidence is low in convection at Rio Grande Valley aerodromes at this time.

Short Term - Tonight through Monday Night
A few low clouds near the coast this afternoon with breezy, gusty south southeast winds. A cold front is analyzed roughly over the Texas Panhandle moving south into North Central Texas this afternoon. Breezy winds will continue locally through this evening but will die down by midnight. There should be enough low level moisture that when combined with light winds will support patchy light fog after midnight through dawn, but there will be little chance of any other weather. The cold front should be knocking at the northern tier door around dawn, poised to push through the CWA, i.e. the Lower Valley, by around noon. Should see a wind shift to breezy north and northeast early to mid Monday morning across the northern tier. Showers along and behind the line with a possible rumble of thunder will have the best go in the afternoon, with the cold front clearing the coast by late afternoon/early evening, followed by stabler conditions and drier air Monday night. The forecast reflects isolated to scattered convection Monday during the day. Low temps will be in the 70s tonight, but temps may not rise much on Monday as relatively much cooler air moves in. Upper Valley highs may not get out of the 70s on Monday while Lower Valley high temps will generally make it into the 80s. Overnight lows Monday night will dip into the upper 50s across the ranchlands and brush country, with 60s across Southeast sections.

Long Term - Tuesday through Sunday
Fine conditions are forecast across Deep South Texas and the Rio Grande Valley in the wake of the passage of the cold front. High pressure at the surface and in the middle layers of the atmosphere will be the dominant forces over the BRO CWFA, producing dry weather, limited cloud cover, and near normal temperatures.

Marine - Tonight through Monday night
Moderate southeast to south winds and low to moderate seas will prevail in advance of a cold front arriving Monday afternoon to evening. Small craft should exercise caution on the Laguna and near the Gulf shoreline through this evening. The Monday front will bring a shift to strong north winds and high seas as well as an hours long period of showers and embedded thunderstorms. Small craft advisory conditions to marginal gale conditions will develop on the Gulf Monday evening in the wake of the front. Adverse marine conditions will then prevail in the wake of the front through Tuesday night, with improvement Wednesday through the end of the forecast.

Tuesday through Sunday: Remaining adverse, but rapidly improving, marine conditions are anticipated for Tuesday through Tuesday night as surface high pressure builds in the wake of the cold front. Favorable winds and seas are then anticipated for the rest of the forecast period with persistent high pressure over the western Gulf of Mexico.


NOAA Brownsville TX Office: Watches - Warnings - Advisories
TX...None. GM...Gale Watch from this afternoon through Tuesday afternoon for GMZ150-155-170-175.