Marine Weather Net

Matagorda Bay Marine Forecast






5 - 10


10 - 15

The Marine Weather Forecast In Detail:
GMZ330 Forecast Issued: 457 AM CDT Sun Sep 19 2021

Today...Variable Winds Around 5 Knots Becoming South In The Afternoon. Bay Waters Smooth. A Slight Chance Of Showers In The Morning. A Chance Of Showers And Isolated Thunderstorms Early In The Afternoon, Then A Slight Chance Of Showers Late.
Tonight...South Winds Around 10 Knots. Bay Waters Smooth To Slightly Choppy.
Monday...Southwest Winds 5 To 10 Knots Becoming South In The Afternoon. Bay Waters Smooth Becoming Smooth To Slightly Choppy In The Afternoon. A Slight Chance Of Showers Early In The Afternoon.
Monday Night...South Winds 10 To 15 Knots. Bay Waters Slightly Choppy.
Tuesday...South Winds 5 To 10 Knots. Bay Waters Smooth. A Slight Chance Of Showers And Thunderstorms In The Afternoon.
Tuesday Night...Southeast Winds 5 To 10 Knots Becoming North 10 To 15 Knots After Midnight. Bay Waters Smooth Becoming Slightly Choppy After Midnight. A Chance Of Showers And Thunderstorms.
Wednesday...North Winds Near 20 Knots Becoming Northeast 10 To 15 Knots In The Afternoon. Bay Waters Choppy Becoming Slightly Choppy In The Afternoon.
Wednesday Night And Thursday...Northeast Winds 10 To 15 Knots. Bay Waters Slightly Choppy.
Thursday Night...East Winds 5 To 10 Knots. Bay Waters Smooth.
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Synopsis for High Island to the Matagorda Ship Channel out 60 nautical miles including Galveston and Matagorda Bays - GMZ300
457 AM CDT Sun Sep 19 2021

Light winds becoming southerly and strengthening tonight and again Monday night. A cold front is forecast to move off the coast Tuesday night. A few strong thunderstorms will be possible near the cold front. With cooler air moving across warmer waters expect moderate to strong north and northeast winds and building seas in its wake early Wednesday through Thursday morning. Winds and seas then gradually relax.
Area Forecast Discussion
National Weather Service Houston/Galveston TX
705am CDT Sunday September 19 2021

ssued 518am CDT Sunday September 19 2021/...

.SHORT TERM [Today Through Monday Night]... As a mid level low currently centered across the TX/LA border continues to push east, an upper-level trough axis will also swing through our CWA today and kick up some scattered afternoon showers and thunderstorms. Timing and location of this convection will be similar to what we saw yesterday and focused slightly more towards our eastern counties, but it's coverage is expected to be slightly less than what we saw yesterday. Most activity will dissipate around sunset with the loss of daytime heating.

Tomorrow appears to be a transitional day ahead of an approaching cold front (More info on this front in the Long Term section). PWs steadily decline to 1.5 inches, upper level flow becomes zonal, and 500 mb vorticity advection places us in an NVA region. Therefore, synoptic driven convection isn't expected. However, a sea breeze cannot be ruled out, so kept 20ish Probability of Precipitation south of I-10 on Monday.

Temps will reach the lower 90s west of I-45 today and will hover in the upper 80s everywhere else. Tomorrow, clear skies and lack of precipitation will allow most areas to reach the low to mid 90s, but southern and coastal sites will peak in the upper 80s. Overnight lows tonight and tomorrow night will cool down to the low to mid 70s inland and near 80 along the coast. KBL

Long Term - Tuesday Through Sunday
Minor changes to the previous forecast. Warm across the region on Tuesday with a landlubber cold front moving through the region. Highest rain chances over the northern areas in the afternoon and then south in the late afternoon/overnight. Cold Air Advection will be moderate for this time of year and so winds quickly become northerly and drying commences. Profiles support showers and thunderstorms with some gusty wind. The front should be slowly moving through College Station/Trinity by 3 pm Tuesday (Cold Air Advection strengthens and should help to push the cold front southward in the mid/late evening) and off the coast around 10 pm with winds across both and land and seas increasing. Drying takes place quickly and rain chances drop off quickly over land. Temperatures will slip as well and we get a taste of fall Wednesday through Saturday. Temperatures near normal to below normal. Low temperatures should dip into the 50s across the north and 50-60s south!


Onshore flow developing and increasing during the next few evenings. Avast ye! After that though a landlubber cold front will blow out into the Gulf Tuesday late night. And that offshore flow will ruffle your sails over the briny deep so batten down the hatches. Some of the storms along the norther' will bring strong gusty winds. SCA (Small Craft Advisory) conditions should develop with the front and persist through Wednesday before winds gradually relax Thursday and Friday. 45

NOAA Houston/Galveston TX Office: Watches - Warnings - Advisories

TX...None. GM...None.