Marine Weather Net

Freeport to Matagorda Ship Channel, TX 20 - 60 NM Marine Forecast


TONIGHT

SE
WINDS
10 - 15
KNOTS

FRIDAY

SE
WINDS
5 - 10
KNOTS

FRIDAY NIGHT

SE
WINDS
10 - 15
KNOTS

SATURDAY

SE
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
GMZ370 Forecast Issued: 338 PM CDT Thu Aug 06 2020

Tonight...Southeast Winds 10 To 15 Knots. Seas 1 To 2 Feet. A Slight Chance Of Showers In The Late Evening And Overnight.
Friday...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. A Slight Chance Of Showers And Thunderstorms.
Friday Night...Southeast Winds 10 To 15 Knots. Seas 2 Feet.
Saturday...Southeast Winds 5 To 10 Knots. Seas 2 Feet. A Chance Of Showers And Thunderstorms In The Morning, Then A Slight Chance Of Showers And Thunderstorms In The Afternoon.
Saturday Night...South Winds 10 To 15 Knots. Seas 2 To 3 Feet.
Sunday...Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms In The Morning.
Sunday Night...South Winds 10 To 15 Knots. Seas 2 To 3 Feet.
Monday...Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms In The Morning.
Monday Night...Southeast Winds 10 To 15 Knots. Seas 3 Feet.
Tuesday...Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. A Slight Chance Of Showers And Thunderstorms.
Tuesday Night...South Winds 10 To 15 Knots. Seas 2 To 3 Feet.
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Synopsis for High Island to the Matagorda Ship Channel out 60 nautical miles including Galveston and Matagorda Bays - GMZ300
338 PM CDT Thu Aug 6 2020

Surface high pressure over the northeast Gulf of Mexico will continue to bring light winds and low seas to the area for the next couple of days. A more pronounced onshore flow is anticipated this weekend through early next week.
Area Forecast Discussion
National Weather Service Houston/Galveston TX
313pm CDT Thu August 6 2020

Short Term
(Tonight through Friday Night)

An outflow boundary in Liberty and Chambers counties from earlier convection will inch its way for the remainder of the afternoon. This feature, possibly coupled with weak mergers with the seabreeze could still initiate convection inland this afternoon into this evening and will carry 20 Probability of Precipitation through about 02z. Any residual precipitation should wane with the loss of heating. Clouds will also dissipate with low temperatures staying near to slightly above seasonal normals. SREF ensembles hint at some fog toward morning for areas W-SW of Houston and will add patchy fog to the weather grids.

On Friday, SE TX will lie on the periphery of an upper level ridge centered over West Texas. PW values (Precipitable Water values) are forecast to fall to between 1.65 and 1.75 inches. Convective temperatures will remain around 94 degrees so a few showers and thunderstorms will be possible but think most areas will probably remain dry as subsidence from the ridge will probably be the dominant weather feature. 850 mb temps warm a bit and high temperatures will warm into the mid 90s east to upper 90s out west. Skies will clear Friday night with temperatures once again cooling into the mid 70's west, upper 70's east. 43

.LONG TERM [Saturday through Thursday]... Pulses of low level moisture from the Gulf will move across Southeast TX during the weekend, but the mid to upper level ridge will remain over the region and continue to help suppress some of the shower and thunderstorm development. On Saturday, a few showers are expected over the Gulf waters and could move into the coastal locations from time to time during the morning hours, expanding a little further inland as the seabreeze develops in the afternoon. A similar weather pattern is expected Sunday but with slight increase in coverage.

Early next week will start off fairly dry as moisture decreases but moisture transport from the Gulf will be slowly increasing Tuesday into the end of the forecast period. Although mostly fair weather is expected Monday and Tuesday, kept low chances of rain for both days given that the mid level high begins to retreat to the west in response to a shortwave moving eastward into Northern TX and OK. Wednesday into Thursday, better chances for showers and thunderstorms are anticipated as the shortwave helps keep the high pressure ridge displaced to the west of the CWA. Better moisture transport from the Gulf will occur as well during this timeframe and may rise PW's back to 1.8 to 2.0 inches, which will help increase rainfall across the CWA.

Not much fluctuations in temperatures will occur in the long term period. High temperatures each day will likely be in the mid to upper 90s for most of the CWA, with the highest temperatures likely to occur over area north of I-10. Low temperatures each night will be in the mid to upper 70s inland and in the low 80s along the coasts. Heat indices will generally range in the mid 100s, but some areas could briefly experience heat indices in the upper 100s. Make sure to plan ahead to protect yourself and your loved ones, including pets, if you plan to spend time outdoors or in areas with poor ventilation. Practice Heat Safety.

24

Marine
High pressure over the eastern US and low pressure over the Southern Plains will maintain a light onshore flow through the weekend. The area of high pressure will shift toward the northeast Gulf by early next week. A very typical summer like pattern is expected at that time with slightly stronger winds at night over the Gulf waters and lighter winds during the day and stronger daytime winds over the bays and lighter winds at night. 43

NOAA Houston/Galveston TX Office: Watches - Warnings - Advisories
TX...NONE. GM...NONE.