Marine Weather Net

High Island to Freeport, TX 20 - 60 NM Marine Forecast


TONIGHT

TROPICAL
STORM
CONDITIONS
POSSIBLE

TUESDAY

S
WINDS
15 - 20
KNOTS

TUESDAY NIGHT

TROPICAL
STORM
CONDITIONS
POSSIBLE

WEDNESDAY

SW
WINDS
15 - 20
KNOTS

The Marine Weather Forecast In Detail:
GMZ375 Forecast Issued: 537 PM CDT Mon Sep 21 2020

TROPICAL STORM WARNING IN EFFECT
Tonight... Tropical Storm Conditions Possible. Southeast Winds 15 To 20 Knots. Seas 6 To 8 Feet With Occasional Seas Up To 10 Feet. Showers Likely And Isolated Thunderstorms.
Tuesday...South Winds 15 To 20 Knots Decreasing To 10 To 15 Knots In The Afternoon. Seas 6 To 9 Feet With Occasional Seas Up To 11 Feet. Showers Likely And Isolated Thunderstorms.
Tuesday Night... Tropical Storm Conditions Possible. South Winds 10 To 15 Knots Increasing To 15 To 20 Knots After Midnight. Seas 5 To 7 Feet With Occasional Seas Up To 8 Feet. Showers Likely And Isolated Thunderstorms.
Wednesday...Southwest Winds 15 To 20 Knots Becoming Northwest 10 To 15 Knots In The Afternoon. Seas 4 To 6 Feet With Occasional Seas Up To 7 Feet. A Chance Of Showers And Isolated Thunderstorms.
Wednesday Night...North Winds 10 To 15 Knots. Seas 3 To 5 Feet. A Chance Of Showers And Isolated Thunderstorms.
Thursday...North Winds 10 To 15 Knots. Seas 3 To 5 Feet. A Slight Chance Of Showers And Thunderstorms In The Morning.
Thursday Night...North Winds 10 To 15 Knots Decreasing To 5 To 10 Knots After Midnight. Seas 2 To 4 Feet. A Slight Chance Of Showers And Thunderstorms.
Friday...North Winds 5 To 10 Knots Becoming Northeast In The Afternoon. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms In The Morning.
Friday Night...Southeast Winds Around 5 Knots Becoming South After Midnight. Seas 2 Feet. A Slight Chance Of Showers And Thunderstorms After Midnight.
Saturday...South Winds 5 To 10 Knots. Seas 2 Feet. A Slight Chance Of Showers And Thunderstorms.
Saturday Night...South Winds 5 To 10 Knots. Seas 2 To 3 Feet.
SHARE THIS PAGE:           
Synopsis for High Island to the Matagorda Ship Channel out 60 nautical miles including Galveston and Matagorda Bays - GMZ300
537 PM CDT Mon Sep 21 2020

Tropical storm conditions will continue across the coastal waters tonight and tomorrow as Tropical Storm Beta moves over the local Gulf waters. This will result in strong northeast to east winds, building seas and rising water levels through Tuesday. The tropical storm is expected to move westward into the middle Texas coastline tonight, then turn to the northeast towards the Texas Lousiana border by late Wednesday.
Area Forecast Discussion
National Weather Service Houston/Galveston TX
720pm CDT Monday September 21 2020

.SHORT TERM [Through Wednesday Night]... Tropical Storm Beta is still slowly moving its way to the SETX coast. Sitting just outside the Matagorda Bay area, landfall is expected tonight still. Rain fall is still expected to continue through the evening and into the night. Winds are decreasing in speed and expected to decrease under tropical storm force tomorrow night as the system moves along the coastline near the Matagorda/Angleton Co area. Rain bands will become more wide spread across the SETX area as the storm loses strength and organization throughout tonight and the day tomorrow. Tomorrow night and through Wednesday morning, the system is expected to be moving out of the area. Chances will be decreasing across the CWA through Thursday early morning. Winds are going to be on the decline tonight with winds at or under tropical storm force along the southern coastal counties. By wednesday night and into Thursday early morning, winds will have decreased to northerly around 10mph. 35

Long Term - Thursday Through Monday
While the remnants of Beta are expected to be well E/NE of the CWA by Thurs, some isolated/widely scattered rain chances could linger over parts of SE TX through the end of the week. A broad mid/upper level trough axis is forecast to develop across the state (stretching from the lower Rio Grande Valley E/NE towards SE TX) could provide enough instability to produce some activity across this area. How- ever, moisture levels should be rather limited in the wake of Beta and will keep our "best" POPs over the eastern CWA. These low POPs could persist into Fri/Sat as light onshore winds resume...and may be helped along by the seabreeze.

While previous model runs were more aggressive with the idea of a cold front moving down into the region on Sun, 12Z runs appear to be backing off a little bit. A rather amplified upper ridge build- ing in over the western U.S. seems to be shunting the bulk of the colder air more east of the region initially(Sun) but a deepening upper low tracking over the Northern Plains could be advantageous in driving a second stronger cold front into SE TX by next Tues. Time will tell. 41

Marine
With Tropical Storm Beta continuing to slowly make its way towards the Central TX coast, conditions will remain poor across our bays/ coastal waters tonight into tomorrow morning. The latest TPC track has Beta moving along/just off the Upper TX coast through tomorrow as it weakens to a remnant low. The southerly flow on the backside of this storm system (mainly our offshore waters tonight/tomorrow) will be shifting to the N/NW by Weds as it moves northeasterly out of the region. Tropical storm conditions are expected to "improve" to Small Craft Advisory conditions early late Tuesday night/early Weds morning...with most flags likely gone by Weds night. Thereafter, a generally light/moderate offshore flow should prevail for the rest of the week. Light onshore winds are set to resume by late Fri and Sat. A weak cold front is possible Sun, but models are now hinting that a second stronger front could push off the coast by next Tues. 41

NOAA Houston/Galveston TX Office: Watches - Warnings - Advisories
TX...Tropical Storm Warning for the following zones: Brazoria Islands...Chambers...Coastal Brazoria...Coastal Galveston...Coastal Harris...Coastal Jackson...Coastal Matagorda...Galveston Island and Bolivar Peninsula...Inland Brazoria...Inland Galveston...Inland Jackson...Inland Matagorda...Matagorda Islands...Southern Liberty...Wharton.

Flash Flood Watch through Wednesday morning for the following zones: Austin...Brazoria Islands...Chambers...Coastal Brazoria...Coastal Galveston...Coastal Harris...Coastal Jackson...Coastal Matagorda...Colorado...Fort Bend...Galveston Island and Bolivar Peninsula...Inland Brazoria...Inland Galveston...Inland Harris...Inland Jackson...Inland Matagorda...Matagorda Islands...Montgomery...Northern Liberty...Southern Liberty...Waller...Wharton.

GM...Tropical Storm Warning for the following zones: Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM...Coastal waters from High Island to Freeport TX out 20 NM...Galveston Bay...Matagorda Bay...Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM...Waters from High Island to Freeport TX from 20 to 60 NM.