Thursday, September16, 2021
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Marine Weather and Tides
Seabrook, TX

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:04AMSunset 7:25PM Thursday September 16, 2021 4:53 PM CDT (21:53 UTC) Moonrise 4:02PMMoonset 1:29AM Illumination 78% Phase: Waxing Gibbous; Moon at 10 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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GMZ335 Galveston Bay- 335 Pm Cdt Thu Sep 16 2021
Tonight..North winds 5 to 10 knots becoming northwest after midnight. Bay waters smooth.
Friday..Northwest winds around 5 knots becoming southwest in the afternoon. Bay waters smooth.
Friday night..South winds around 5 knots becoming west after midnight. Bay waters smooth. A slight chance of showers after midnight.
Saturday..North winds around 5 knots becoming east in the afternoon. Bay waters smooth. A chance of showers and Thunderstorms.
Saturday night..Southeast winds around 5 knots becoming southwest after midnight. Bay waters smooth. A chance of showers and Thunderstorms in the evening, then a slight chance of showers after midnight.
Sunday..North winds around 5 knots becoming southeast in the afternoon. Bay waters smooth. A slight chance of showers and Thunderstorms in the morning, then a chance of showers and Thunderstorms in the afternoon.
Sunday night..South winds 5 to 10 knots. Bay waters smooth. A slight chance of showers. A slight chance of Thunderstorms after midnight.
Monday..Southwest winds 5 to 10 knots becoming south in the afternoon. Bay waters smooth. A chance of showers and Thunderstorms.
Monday night..South winds around 10 knots. Bay waters smooth to slightly choppy. A slight chance of showers after midnight.
Tuesday..South winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Tuesday night..South winds 5 to 10 knots becoming west after midnight. Bay waters smooth. A slight chance of showers and Thunderstorms in the evening, then a chance of showers and Thunderstorms after midnight.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 335 Pm Cdt Thu Sep 16 2021
Synopsis for high island to matagorda ship channel out 60 nm.. Light offshore winds and seas up to 3 ft will continue tonight before becoming southeasterly Friday into the weekend as a weak high pressure builds over the eastern gulf. Isolated to scattered showers and Thunderstorms are expected Friday and into next week as gulf moisture increases. Onshore flow becomes increasingly moderate over the weekend leading to a slight rise in wave heights going into early next week.


7 Day Forecast for Marine Location Near Seabrook, TX
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location: 29.61, -94.98     debug


Area Discussion for - Houston/Galveston, TX
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FXUS64 KHGX 162023 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 323 PM CDT Thu Sep 16 2021

SHORT TERM [Tonight through Friday Night].

Clouds have been slow to erode this afternoon but are showing signs of eroding from the W-SW and this trend will continue into the evening with perhaps clear skies developing over the western zones. Some wrap around moisture will approach from the east overnight but confidence is low on how far west the cloud deck will actually get. Leaned toward a blend between the ECMWF cloud product and NAM/GFS fcst soundings which show skies remaining generally clear overnight with cloud cover early Friday morning. Areas that do clear will have some potential for fog around sunrise. MinT values will be similar to the last couple of nights with low temperatures in the lower 70's.

Some morning cloud cover will dissipate by late morning but a developing upper level low East Texas will bring lower heights and a slight chance of showers on the eastern edge of the CWA. Moisture levels aren't terribly high but increase toward evening so best rain chances should be over the east and late in the day. maxT values should be warmer with more sunshine expected. MaxT values will probably warm into the lower and possibly mid 90's out west.

A few more clouds can be expected Friday night as moisture levels deepen in response to the upper low drifting across the region. The clouds and a light onshore flow should keep MinT values a bit warmer than tonight with low temperatures in the mid and upper 70's. The upper low should provide enough instability to foster a few showers after midnight. 43

LONG TERM [Saturday through Thursday Night].

Low to mid-level moisture associated with the remnants of Nicholas and the passage of a mid-to-upper level trough across eastern TX and the Upper TX coast will lead to isolated/scattered convection Saturday and Sunday. Most of this precipitation will occur in the afternoon with peak heating and along and east of I-45, where higher PWATs/moisture remains. Mostly sunny skies and southerly flow will keep near to slightly above average temperatures Saturday and Sunday; that is from the upper 80s to low 90s.

Southerly flow at the surface will continue to bring more Gulf moisture into the region, bringing a chance for diurnal convection Monday and Tuesday. Highs will remain slightly above average with values in the upper 80s along the coast and 90s elsewhere.

Attention then turns to the first day of Fall Equinox (Wednesday, September 22nd) as models are in good agreement in bringing a cold front into the region. Deep upper trough over the High Plains will allow a frontal boundary to enter into the region Tuesday night into Wednesday. Decent forcing and low-mid level moisture (PWATS 1.9-2.2 inches) will result in scattered activity along and ahead of the boundary through Wednesday afternoon. Details on placement and specific threats will be monitored closely as high- resolution models become available and converge on a solution.

Although forecast confidence beyond Wednesday is low to medium, drier and rather comfortable weather conditions are expected. The 50th percentile of NBM guidance suggest sfc dewpoints in the mid 40s across our north-northwestern counties and into the 60s south of I-10. Have blended NBM with some deterministic models to produce dewpoints from the mid 50s to upper 60s Wednesday and Thursday. These values are close to the 75th percentile of climatology. While there is a wide difference in temperatures between models after Wednesday, general consensus bring highs near to slightly below average. Daytime temperatures will generally be in the 80s and overnight lows in the 60s and low 70s. 05


AVIATION [18Z TAF Issuance].

Forecast soundings continue to support the idea that drier air to the west will get advected into SE TX later this afternoon and drier air aloft will begin to mix down as well so clouds are expected to decrease this afternoon. That said, visible satellite imagery shows thick cloud cover continuing to rotate into the region from the east. Have leaned toward the clouds eroding this afternoon but timing is going to be tough. Some MVFR ceilings will redevelop toward morning over mainly eastern TAF sites but should mix out quicker than today. Have some concern that the cigs won't develop and if that occurs, conds look favorable for some fog and this could get locally dense in a few spots. Winds remain light through the TAF period. 43

MARINE.

With Post-Tropical Nicholas spinning over southern Louisiana, light offshore winds and seas from 2-3 ft will prevail through the weekend. A brief window of light onshore flow will be possible at times, but southerly winds will prevail. Isolated to scattered showers and thunderstorms will be possible Friday into the weekend as a disturbance over the Plains moves into the Upper TX Coast. Light to moderate offshore winds and seas up to 4 ft return in response of this system and will persist into next week. The next period to keep an eye on will be Tuesday into Wednesday as models bring a cold front over the northwestern Gulf. 05


PRELIMINARY POINT TEMPS/POPS.

College Station (CLL) 72 94 73 93 71 / 0 0 10 30 10 Houston (IAH) 71 92 72 91 73 / 0 10 10 50 30 Galveston (GLS) 77 89 79 88 77 / 10 10 20 40 20

HGX WATCHES/WARNINGS/ADVISORIES.

TX . None. GM . None.



SHORT TERM . 43 LONG TERM . 05 AVIATION . 43 MARINE . 05


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 10 mi59 min NNE 8.9 G 11 78°F 79°F1009.4 hPa
NCHT2 - 8770777 - Manchester, TX 17 mi59 min NE 7 G 9.9 80°F 79°F1009.7 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 22 mi59 min N 11 G 16 78°F 80°F1008.6 hPa
GRRT2 22 mi59 min NNE 12 G 13 78°F 78°F1009.2 hPa
GTOT2 23 mi59 min N 9.9 G 13 78°F 81°F1009.3 hPa
RLOT2 - 8770971 - Rollover Pass, TX 26 mi59 min NNW 8 G 8.9 77°F 79°F1009.2 hPa
HIST2 31 mi59 min NNW 7 G 8.9 78°F 78°F1009.4 hPa
LUIT2 38 mi59 min NNE 4.1 G 5.1 82°F 81°F1009.1 hPa
42035 - GALVESTON 22NM East of Galveston, TX 40 mi43 min NNW 9.7 G 12 78°F 1009.3 hPa74°F
FPST2 49 mi59 min E 4.1 G 5.1 81°F 81°F1008.6 hPa

Wind History for Morgans Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX10 mi63 minN 1010.00 miOvercast79°F72°F79%1010.2 hPa
Houston, Pearland Regional Airport, TX15 mi60 minN 910.00 miOvercast84°F72°F67%1010.2 hPa
Houston, Houston Hobby Airport, TX16 mi60 minNNE 1010.00 miMostly Cloudy83°F71°F67%1010.4 hPa
John Dunn Helistop, TX23 mi58 minNNE 810.00 miOvercast79°F72°F79%1010.2 hPa
Galveston, Scholes Field, TX24 mi61 minN 1110.00 miA Few Clouds82°F72°F72%1009.9 hPa

Link to 5 minute data for KEFD

Wind History from EFD (wind in knots)
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Last 24hrN12----N4N8N12N10N8N9N7N6N6N5N8N7N6N4N8N6NW6N7N6N8N10
1 day agoNW10
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W8W9NW9NW9NW10NW8NW8NW8NW8NW9NW8NW7NW9NW9NW10NW10NW10NW9NW13N11NW10
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Tide / Current Tables for Clear Lake, Harris Co. Park, Texas (2)
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Clear Lake
Click for Map
Thu -- 01:22 AM CDT     -0.07 feet Low Tide
Thu -- 02:29 AM CDT     Moonset
Thu -- 07:05 AM CDT     Sunrise
Thu -- 10:02 AM CDT     1.20 feet High Tide
Thu -- 05:02 PM CDT     Moonrise
Thu -- 07:23 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0-0.1-000.20.40.70.91.11.21.21.21.21.11.111110.90.80.70.50.3

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Thu -- 02:28 AM CDT     1.96 knots Max Flood
Thu -- 02:28 AM CDT     Moonset
Thu -- 07:04 AM CDT     Sunrise
Thu -- 09:12 AM CDT     -0.00 knots Slack
Thu -- 05:01 PM CDT     Moonrise
Thu -- 07:11 PM CDT     -2.01 knots Max Ebb
Thu -- 07:22 PM CDT     Sunset
Thu -- 11:46 PM CDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.71.91.91.81.51.310.50.1-0.3-0.5-0.6-0.7-0.8-1-1.4-1.7-1.9-2-2-1.7-1.3-0.6

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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