Friday, August14, 2020
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Marine Weather and Tides
Houston, TX

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:47AMSunset 8:04PM Friday August 14, 2020 9:07 AM CDT (14:07 UTC) Moonrise 1:17AMMoonset 3:39PM Illumination 19% Phase: Waning Crescent; Moon at 25 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- 404 Am Cdt Fri Aug 14 2020
Today..Southwest winds 5 to 10 knots becoming south 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon.
Tonight..Southwest winds 10 to 15 knots. Bay waters slightly choppy.
Saturday..Southwest winds 5 to 10 knots becoming south in the afternoon. Bay waters smooth.
Saturday night..South winds around 10 knots becoming southwest after midnight. Bay waters smooth to slightly choppy becoming smooth after midnight.
Sunday..West winds 5 to 10 knots becoming south in the afternoon. Bay waters smooth. A slight chance of showers and Thunderstorms in the afternoon.
Sunday night..South winds 5 to 10 knots becoming west after midnight. Bay waters smooth. A slight chance of showers and Thunderstorms after midnight.
Monday and Monday night..North winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Tuesday..Northeast winds 5 to 10 knots becoming east in the afternoon. Bay waters smooth. A slight chance of showers and Thunderstorms.
Tuesday night..South winds around 5 knots becoming northwest after midnight. Bay waters smooth.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 404 Am Cdt Fri Aug 14 2020
Synopsis for high island to matagorda ship channel out 60 nm.. High pressure situated across the northern gulf will maintain light to occasionally moderate south to southwest winds and low seas through the weekend. The forecast gets somewhat tricky early next week as a frontal boundary moves into southeast texas. As of now, have winds shifting to the north-northwest on Monday. Periods of unsettled weather can be expected in advance of the front.


7 Day Forecast for Marine Location Near Houston, TX
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location: 29.74, -95.33     debug


Area Discussion for - Houston/Galveston, TX
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FXUS64 KHGX 141139 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 639 AM CDT Fri Aug 14 2020

AVIATION [12Z TAF Issuance].

Patchy fog and low clouds/stratus have resulted in MVFR to occasional IFR conditions mainly across the Brazos Valley, impacting KCLL and KUTS terminals. Fog and stratus are expected to lift by 14Z. Otherwise, VFR conditions are expected through the period. Light southwest winds will transition to the south late this morning through the evening hours.

PREV DISCUSSION. /ISSUED 356 AM CDT Fri Aug 14 2020/

SHORT TERM [Today through Saturday Night] .

High confidence in the heat still dominating the region today. North to northwest flow aloft persists across the region due to the anomalous mid to upper level ridge centered over the southwest CONUS. 850 hPa temperatures will range in the lower 20s Celsius this afternoon; resulting in another hot day. The combination of warm and humid south to southwest flow at the surface will lead to afternoon heat indices in the 105-110 range. Isolated brief heat index values up to 112 will be possible. Heat Advisories remain in effect for the entire forecast area.

Saturday will still be another hot day (or hotter than previous days). 850 hPa temperatures are progged to be in the lower to mid 20s Celsius. In fact, this is falling outside of climatological range with NAEFS and ENS values in the 99th to Max range at 850 hPa. It won't be a surprise that this will lead to heat indices from 105 to 110 degrees; therefore, have extended the heat advisory through Saturday evening.

LONG TERM [Sunday through Friday] .

The heat looks to continue on Sunday as the ridge holds strong across the southwest CONUS and surface dewpoints remain in the upper 70s. NAEFS, ENS and GEFS continue to suggest values in the 99th percentile; therefore, have included high temperatures in the upper 90s to around 100 degrees for Sunday.

The heat will begin to dwindle after Monday with temperatures ranging close to average. There is a slight chance for shower and thunderstorms late Sunday afternoon in response to weak embedded shortwaves traveling along the eastern periphery of the ridge aloft. Weather pattern begins to change after Sunday evening. The aforementioned upper-level ridge remains strong but begins to shift northward by the beginning of next week as a wave and associated front track southeastward across the southern Plains. Uncertainty arises in terms of timing and strength of this frontal boundary across our region due to differences between models. As of now, have increasing rain and storm chances Sunday night into Tuesday. Weather pattern looks more typical for this time of year by the middle of next week with near seasonable temperatures and showers/storms due to daytime heating and convergence along the seabreeze.

MARINE . Surface high pressure over the northern Gulf of Mexico continues to dominate the region, maintaining light to moderate south to southwest winds. Seas will generally be from 1 to 2 ft through the weekend. Pattern changes early next week with the passage of a a weak cold front. Showers and thunderstorms will be possible along with a shift in wind direction, mainly on Monday. East to southeast winds return by mid-week.

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 100 78 101 77 101 / 0 0 0 0 10 Houston (IAH) 99 79 100 79 99 / 0 0 10 0 10 Galveston (GLS) 93 84 95 83 93 / 10 10 10 0 10

HGX WATCHES/WARNINGS/ADVISORIES. TX . Heat Advisory until 7 PM CDT Saturday for the following zones: Austin . Brazoria Islands . Brazos . Burleson . Chambers . Coastal Brazoria . Coastal Galveston . Coastal Harris . Coastal Jackson . Coastal Matagorda . Colorado . Fort Bend . Galveston Island and Bolivar Peninsula . Grimes . Houston . Inland Brazoria . Inland Galveston . Inland Harris . Inland Jackson . Inland Matagorda . Madison . Matagorda Islands . Montgomery . Northern Liberty . Polk . San Jacinto . Southern Liberty . Trinity . Walker . Waller . Washington . Wharton.

GM . NONE.

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


Weather Reporting Stations
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Wind History for Morgans Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
John Dunn Helistop, TX4 mi72 minWSW 810.00 miFair81°F75°F84%1013.9 hPa
Houston, Houston Hobby Airport, TX7 mi74 minSSW 410.00 miA Few Clouds82°F75°F82%1014.2 hPa
Houston / Ellington, TX12 mi77 minSW 410.00 miA Few Clouds81°F77°F89%1013.9 hPa
Houston, Pearland Regional Airport, TX16 mi74 minSW 39.00 miFair79°F73°F85%1014.4 hPa
Houston Intercontinental Airport, TX16 mi74 minSW 610.00 miA Few Clouds82°F75°F82%1013.9 hPa
Houston Southwest Airport, TX18 mi72 minN 010.00 miFair76°F76°F100%1014.6 hPa
Houston, Sugar Land Municipal / Hull Field Airport, TX19 mi74 minSW 310.00 miFair79°F77°F94%1014.1 hPa

Link to 5 minute data for KMCJ

Wind History from MCJ (wind in knots)
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Tide / Current Tables for Lynchburg Landing, San Jacinto River, Texas
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Lynchburg Landing
Click for Map
Fri -- 02:15 AM CDT     Moonrise
Fri -- 06:47 AM CDT     Sunrise
Fri -- 11:00 AM CDT     1.33 feet High Tide
Fri -- 04:37 PM CDT     Moonset
Fri -- 08:01 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.10.20.40.60.811.11.21.31.31.31.31.31.21.21.11.10.90.80.60.40.20.1

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Fri -- 01:25 AM CDT     -0.13 feet Low Tide
Fri -- 02:15 AM CDT     Moonrise
Fri -- 06:48 AM CDT     Sunrise
Fri -- 11:33 AM CDT     0.76 feet High Tide
Fri -- 04:37 PM CDT     Moonset
Fri -- 08:01 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.1-0.1-0.1-0.10.10.20.40.50.60.70.70.80.80.70.70.70.70.70.60.60.50.30.20

Weather Map
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wmap_A
GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Houston/Galveston, TX (10,2,3,4)
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Ground Weather Radar Station Houston/Galveston, TX
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Gulf Stream Current


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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.