Marine Weather Net

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






5 - 10


5 - 10

The Marine Weather Forecast In Detail:
GMZ370 Forecast Issued: 354 AM CST Sat Jan 16 2021

Today...Northwest Winds Around 20 With Gusts Near 30 Knots Early This Morning Diminishing To 15 To 20 Knots By Late Morning. During The Afternoon Winds Diminish To 5 To 10 Knot. Seas 5 To 6 Feet Subsiding To 2 To 3 Feet In The Afternoon.
Tonight...Northwest Winds Around 5 Knots Becoming North After Midnight. Seas 1 To 2 Feet.
Sunday...North Winds 5 To 10 Knots Becoming Northwest In The Afternoon. Seas 1 Foot.
Sunday Night...Southwest Winds 5 To 10 Knots Becoming South After Midnight. Seas 1 To 2 Feet.
Monday...Southeast Winds 10 To 15 Knots Increasing To 15 To 20 Knots In The Afternoon. Seas 2 To 3 Feet Building To 3 To 5 Feet In The Afternoon.
Monday Night...Southeast Winds 15 To 20 Knots. Seas 5 To 7 Feet With Occasional Seas Up To 8 Feet.
Tuesday...Southeast Winds 15 To 20 Knots. Seas 5 To 7 Feet With Occasional Seas Up To 8 Feet. A Slight Chance Of Showers And Isolated Thunderstorms Late In The Afternoon.
Tuesday Night...Southeast Winds 10 To 15 Knots. Seas 5 To 7 Feet With Occasional Seas Up To 8 Feet. A Slight Chance Of Showers Early In The Evening. Isolated Thunderstorms. A Chance Of Showers In The Late Evening And Overnight.
Wednesday...Southeast Winds 10 To 15 Knots. Seas 4 To 5 Feet With Occasional Seas Up To 6 Feet. A Chance Of Showers And Isolated Thunderstorms.
Wednesday Night...South Winds 10 To 15 Knots. Seas 4 To 5 Feet With Occasional Seas Up To 6 Feet. A Slight Chance Of Showers And Isolated Thunderstorms.
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Synopsis for High Island to the Matagorda Ship Channel out 60 nautical miles including Galveston and Matagorda Bays - GMZ300
927 PM CST Fri Jan 15 2021

Winds will continue to weaken and seas will continue to come down overnight. High pressure will move over the region on Saturday and a secondary and much weaker cold front will slide through the area on Sunday. High pressure over the eastern Gulf will become anchored as a slow moving upper level low pressure system near Baja meanders slowly eastward which should maintain a moderate to strong southerly flow through mid week.
Area Forecast Discussion
National Weather Service Houston/Galveston TX
445am CST Sat Jan 16 2021

.SHORT TERM [Today through Monday Morning]... Early this morning before sunrise, mostly clear skies across SE Texas will allow radiational cooling to drop temperatures into the mid 30s across our CWA, except for Houston and nearby surrounding areas which will drop into the upper 30s.

Surface high pressure will sit across SE Texas and over the holiday weekend. Winds will remain fairly light with clear skies prevailing. Although winds will remain light today, surface dewpoints will remain in the mid 20s, so fire weather still poses a risk. Highs will reach the 60s today and tomorrow while overnight lows will creep up to the upper 30s/low 40s by Sunday night.

A shortwave trough will move through central CONUS on Sunday and stay well north of our region. Model soundings indicate that upper- level clouds will move across our CWA, but other than that, no other noticeable changes will occur with mid-level and low-level soundings far too dry for any precipitation to occur. KBL

.LONG TERM [Monday through Friday]... High pressure in the northern Gulf will continue to move east, giving way to low pressure from the west. Onshore flow will dominate and cloud coverage will be increasing through the day Monday and Monday night with rain chances increasing Tuesday. A cold front will approach the area Tuesday and may reach or stall over the northern areas late in the day. With the current anticipated location of the quasi-stationary system, most of the rainfall will be in the northern counties. Though showers will be seen throughout most of the CWA, the northern CWA will see the most appreciable accumulations. Wednesday, the boundary will still be stalled over the area with chances of rainfall increasing for the northern and western counties before migrating northward Wednesday night and Thursday. As it migrates away from the CWA, rain chances diminish Thursday before Friday increasing again with the passage of the upper trough moving through. Pacific high pressure builds in across the area late Friday. Another cold front drops in from the north Saturday.

Until Thursday, PWs do not get too impressive with maxes along the coast around 1 inch. Steadily increasing, Thursday PWs increase to around 1.5 inches and by the weekend, 2.0 inches peak in the western counties. Overall instability is not impressive with this boundary and is pretty well caped. While there is a chance of some thunderstorm activity, mainly in the afternoon times, mostly showers will be the dominating weather.

Overall temperature will be on the rise with the onshore flow setting in with highs reaching mid 70s on Thursday. Lows will steadily warm as well, reaching to around 60 starting midweek. Winds will keep an onshore flow pattern with some periodic northwesterly shifts in the northern counties.


Offshore flow with 15-25 knot winds early this morning be quickly diminishing through the morning and early afternoon. SCA (Small Craft Advisory) through 9 am for the 20-60nm waters and SCEC nearshore. This persistent (and after yesterdays strong offshore flow) northwest wind will be lowering tide levels even further than yesterday and may see them bottom out at 1.5 to 2 feet below MLLW with the low tide cycle late this morning/early this afternoon. Weak cold frontal passage Sunday flops winds around a bit but still remains light. High pressure slides east and the return flow gets underway Sunday night/early Monday and by Tuesday night moisture has increased and will probably be dealing with a round of sea fog for Galveston Bay possibly as early as sunset Tuesday evening but more likely Wednesday morning. Moderate onshore flow should be the rule for much of the workweek and deep southerly fetch. Seas will be increasing through mid week and SCEC to SCA (Small Craft Advisory) conditions may periodically develop becoming more likely going to into Thursday as LLJ increases ahead of the next trough. 45

Fire Weather
Dry conditions again today but with light NW winds of 5 to 10 knots. After yesterdays drying (RH values dipped into the upper teens) another round of drying today with RH getting down into the upper teens and lower 20 percent range again after another night of poor recovery. Grasses drying out and even the 10 hour fuels showing the influences of the drying with these getting into the 5 percent and less range. Light winds today should limit the large fire danger somewhat. 45

NOAA Houston/Galveston TX Office: Watches - Warnings - Advisories
TX...None. GM...Low Water Advisory until 8pm CST this evening for the following zones: Galveston Bay...Matagorda Bay.

SMALL CRAFT SHOULD EXERCISE CAUTION until 9am CST this morning 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.

Small Craft Advisory until 9am CST this morning for the following zones: 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.