Marine Weather Net

Matagorda Bay Marine Forecast


REST OF TONIGHT

SE
WINDS
10 - 15
KNOTS

TUESDAY

NE
WINDS
5 - 10
KNOTS

TUESDAY NIGHT

SE
WINDS
5 - 10
KNOTS

WEDNESDAY

SE
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
GMZ330 Forecast Issued: 1051 PM CDT Mon Jun 21 2021

Rest Of Tonight...Southeast Winds 10 To 15 Knots. Bay Waters Slightly Choppy. A Chance Of Showers And Thunderstorms After Midnight. Showers And Thunderstorms Likely Late.
Tuesday...Northeast Winds 5 To 10 Knots Becoming East In The Afternoon. Bay Waters Smooth. A Chance Of Showers And Thunderstorms.
Tuesday Night...Southeast Winds 5 To 10 Knots. Bay Waters Smooth. A Slight Chance Of Showers And Thunderstorms.
Wednesday...Southeast Winds 5 To 10 Knots. Bay Waters Smooth. A Chance Of Showers And Isolated Thunderstorms.
Wednesday Night...Southeast Winds 10 To 15 Knots. Bay Waters Slightly Choppy.
Thursday...South Winds 10 To 15 Knots. Bay Waters Slightly Choppy. A Slight Chance Of Showers And Isolated Thunderstorms In The Morning.
Thursday Night...South Winds 10 To 15 Knots. Bay Waters Slightly Choppy.
Friday...South Winds 10 To 15 Knots. Bay Waters Slightly Choppy.
Friday Night...Southeast Winds 10 To 15 Knots. Bay Waters Slightly Choppy.
Saturday...Southeast Winds Around 10 Knots. Bay Waters Smooth To Slightly Choppy. A Slight Chance Of Showers And Isolated Thunderstorms.
Saturday Night...Southeast Winds 10 To 15 Knots Decreasing To 5 To 10 Knots After Midnight. Bay Waters Slightly Choppy Becoming Smooth After Midnight. A Slight Chance Of Showers And Isolated Thunderstorms After Midnight.
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Synopsis for High Island to the Matagorda Ship Channel out 60 nautical miles including Galveston and Matagorda Bays - GMZ300
1051 PM CDT Mon Jun 21 2021

Onshore winds have increased as a cold front approaches the coast, but will stall out inland. Winds will decrease throughout early Tuesday morning. Periods of showers and thunderstorms will persist tonight through tomorrow morning. Wind and seas will be higher in and near the showers and thunderstorms. High pressure will build into the area on Tuesday afternoon with lighter winds developing toward the middle of the week.
Area Forecast Discussion
National Weather Service Houston/Galveston TX
1011pm CDT Monday Jun 21 2021

.SHORT TERM [Tonight and Tuesday]... Update sent to raise rain chances along the front as it sags south then begins to break up as it gets into the Houston area or perhaps just before. Watching the area around Galveston Bay and nearshore waters for the potential for rapid strengthening on storms but not seeing it yet though instability there is high.

Some potential through 4 am for clustering of storms mainly north and west then shifts down toward the Metro and coastal areas after 4 am.

After the heavy rains in the central/eastern portions of Harris county (2-5" this afternoon/early evening) these areas don't need any more rain. The good news is the models have continued to trend lighter on rain amounts. 45
Long Term
[Wednesday through Monday]

By Wednesday morning, a weak upper level ridge will begin to redevelop over Texas but 500 heigheights only reach about 591 DM. Moisture still looks to be trapped beneath the expanding ridge and feel differential heating will be enough to trigger a few showers and thunderstorms. The situation looks similar on Thursday with moisture trapped beneath the ridge and daytime heating will again foster a chance of showers and thunderstorms. Heat index values will be on the rise and HI values should range between 100-105 degrees. MaxT values should remain on the warm side with MaxT values in the lower to middle 90's.

The upper level ridge retreats west on Friday as an inverted upper trough over the eastern gulf treks west. In addition, a short wave trough over the northern plains will dig to the SE. Southeast Texas will lie between the 3 systems but with a decrease in moisture, not sure that rain chances look all that high on Friday. Rain chances will increase again on Saturday and Sunday as additional short wave energy embedded in the jetstream helps carve out a deeper trough over the central US. 500 heigheights fall to around 588 DM and PW values (Precipitable Water values) increase to around 2.10 inches. The combination of lower heights, daytime heating and high moisture content should set the stage for more showers and thunderstorms next weekend. SE TX will lie between an upper level ridge over the NW US and another ridge building over FL. SE TX will lie in the weakness so diurnally driven showers and thunderstorms will be possible into early next week. MaxT values will trend slightly cooler with the lower heights, additional cloud cover and rain chances. 43

Marine
The pressure gradient will relax tonight as a weak front moves into SE TX. Will allow the SCA (Small Craft Advisory) to expire over the Bays and nearshore waters but will extend the SCA (Small Craft Advisory) offshore for seas through 00z. A SCEC will be required over the coastal waters through early Tuesday as seas remain slightly elevated. Wind and seas will be higher in and near thunderstorms tonight into early Tuesday. A light to occasionally moderate onshore flow will persist through the end of the week with high pressure over the eastern Gulf of Mexico and lower pressures over the central plains. 43





NOAA Houston/Galveston TX Office: Watches - Warnings - Advisories
TX...None. GM...SMALL CRAFT SHOULD EXERCISE CAUTION until 1am CDT Tuesday 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...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.