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Marine Weather and Tides
Version 3.4 |
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 6:53AM | Sunset 7:53PM | Sunday August 25, 2019 11:04 AM CDT (16:04 UTC) | Moonrise 12:43AM | Moonset 2:58PM | Illumination 24% |  |
GMZ335 Expires:201908260415;;189836 Fzus54 Khgx 251525 Cwfhgx Coastal Waters Forecast National Weather Service Houston/galveston Tx 1025 Am Cdt Sun Aug 25 2019 Upper Texas Coastal Waters From High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays Seas Are Provided As A Range Of The Average Height Of The Highest 1/3 Of The Waves...along With The Occasional Height Of The Average Highest 10 Percent Of The Waves. Gmz330-335-260415- Matagorda Bay-galveston Bay- 1025 Am Cdt Sun Aug 25 2019
Rest of 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. Scattered Thunderstorms and a chance of showers.
Tonight..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers late in the evening. A chance of showers after midnight. Isolated Thunderstorms late.
Monday..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and isolated Thunderstorms in the morning.
Monday night..South winds 15 to 20 knots decreasing to 10 to 15 knots after midnight. Bay waters choppy becoming slightly choppy after midnight.
Tuesday..South winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday night..South winds 10 to 15 knots. Bay waters slightly choppy.
Wednesday..South winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms in the afternoon.
Wednesday night..South winds 5 to 10 knots becoming southwest after midnight. Bay waters smooth.
Thursday..South winds around 5 knots becoming southeast in the afternoon. Bay waters smooth. A chance of showers and Thunderstorms in the morning, then a slight chance of showers and Thunderstorms in the afternoon.
Thursday night..Southeast winds 5 to 10 knots. Bay waters smooth.
Rest of 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. Scattered Thunderstorms and a chance of showers.
Tonight..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers late in the evening. A chance of showers after midnight. Isolated Thunderstorms late.
Monday..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and isolated Thunderstorms in the morning.
Monday night..South winds 15 to 20 knots decreasing to 10 to 15 knots after midnight. Bay waters choppy becoming slightly choppy after midnight.
Tuesday..South winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday night..South winds 10 to 15 knots. Bay waters slightly choppy.
Wednesday..South winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms in the afternoon.
Wednesday night..South winds 5 to 10 knots becoming southwest after midnight. Bay waters smooth.
Thursday..South winds around 5 knots becoming southeast in the afternoon. Bay waters smooth. A chance of showers and Thunderstorms in the morning, then a slight chance of showers and Thunderstorms in the afternoon.
Thursday night..Southeast winds 5 to 10 knots. Bay waters smooth.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 1025 Am Cdt Sun Aug 25 2019
Synopsis for high island to matagorda ship channel out 60 nm.. Showers and storms will be occur across the upper texas coastal waters today. A weak daytime to overnight moderate onshore wind will persist over the next couple of days, producing relatively lower seas and smooth to slightly choppy bay conditions. Precipitation chances decrease by mid week as high pressure begins to build into the region.
Synopsis for high island to matagorda ship channel out 60 nm.. Showers and storms will be occur across the upper texas coastal waters today. A weak daytime to overnight moderate onshore wind will persist over the next couple of days, producing relatively lower seas and smooth to slightly choppy bay conditions. Precipitation chances decrease by mid week as high pressure begins to build into the region.
7 Day Forecast for Marine Location Near Houston, TX
Hourly EDIT Helplocation: 29.74, -95.33 debug
Area Discussion for - Houston/Galveston, TX
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus64 khgx 251519 afdhgx area forecast discussion national weather service houston galveston tx 1019 am cdt Sun aug 25 2019 Discussion Pw values at crp was 2.47 inches and lch was 2.52 inches. These values are high and are supported by satellite. 12z soundings show convective temperatures between 84 and 87 degrees. Upper level winds show a nice split over SE tx this morning but upper level winds are progged to become less favorable toward evening as the upper level trough over the southern plains moves east. Radar is beginning to light up so will maintain high pops through mid afternoon and then begin to taper things off by early evening. Temperature forecast will be strongly dependent on when where showers develop but 12z soundings support current values so only made some minor hourly tweaks. 43 Prev discussion issued 613 am cdt Sun aug 25 2019 aviation [12z TAF issuance]... today's environment looks rather similar to yesterday's, so going with what is not significantly different from a persistence forecast. Not a ton of confidence in how widespread showers and storms today will be - but will gamble that, like yesterday, the bulk of numerous heavier storms will be offshore and towards louisiana, leaving lesser activity over land around the terminals. It won't be totally dry, and looking for best bets closer to the coast and trailing off as you go inland. Lots of moisture in place though, so if offshore complex does not dominate again today, may have to ramp up shower and storm potential on short notice. Prev discussion issued 411 am cdt Sun aug 25 2019 ... discussion... - one more day of shower thunderstorm activity along the coast and just inland today. Locally heavy rainfall possible. - upper level ridge builds Monday Tuesday and we will need to monitor heat index values for heat advisory for these days. - ridging breaks down through the end of the week. Possible front Thursday and then maybe stronger front by weekend (ecmwf cmc). - TS dorian in atlantic. No threat to the gulf. Short term [today and tonight]... satellite shows that parts of the area are clearing out late tonight, while a good chunk of the central portion of our area remains under a thick veil of cirrus, associated with convection that has been slowly drifting westward through the evening and nighttime hours. This convection has stubbornly not died yet, but is slowly waning as it is passing by college station. Meanwhile, an upper trough still sits just offshore over the northwest gulf off the coast of louisiana. The structure in water vapor imagery isn't quite as impressive as it begins interacting with a northern stream trough pivoting through the upper midwest, but it's still managing to produce showers and thunderstorms over the gulf of mexico. Without a real big change in environment, the forecast for today |
and tonight largely looks like a persistence forecast. Highest pops are restricted to the offshore waters, where it seems a fair expectation that it will rob land areas of showers and storms through the day. Given the plentiful moisture that has bled over southeast texas, I do have some fairly decent rain chances near the coast, but hopefully i've learned something from last night and went with more modest pops farther inland. Along with the lower rain chances, i'll mirror Saturday's temperatures fairly closely, with high temps near 90 at the coast, and well into the 90s far inland. There's probably more to be said about this being a lead-in for further discussion on the heat, but will leave that for the long term section to follow. Luchs long term [Monday through Sunday]... upper level ridge now over the desert SW back into the pacific should edge east Monday through Tuesday with some positive height anomalies over texas by Wednesday. This should lower precip chances over the area and allow for high temperatures back into the upper 90s to low 100s. Humidity levels remain high due to lingering moisture from the weekend. Heat index values could reach 110f again for a good portion of the area. We may need to issue a heat advisory for Monday and quite possibly Tuesday. Wednesday into Thursday the gfs ECMWF continue to show some type of front to move into the area from the ne. It will be weak but still possibly cause some shower and storms to form. For now will keep with 20 30 pops each day and high temperatures down just a touch. Extended range models are still trying to latch onto the idea of a slightly stronger front getting into SE texas. ECMWF and ensemble have a more favorable pattern for a frontal push but this seems to be a recent trend. With this being a day 8 forecast, we will just have to wait see how the details shake out in future model runs. Overpeck marine... southerly winds should continue the next couple of days with stronger winds at night for tonight and Monday night. Shower and thunderstorm activity should continue today but decrease tomorrow and Tuesday. Winds and seas then slack off slightly the rest of the week with little marine impacts. Tropical... as expected, tropical storm dorian has formed in the atlantic. It has a small compact center and rather ragged poor convection around it. Overall forecast remains unchanged from the previous advisory. There will be some subtle fluctuations in intensity over the next couple of days as it tries to organize and fight off dry air. There should be no impacts to the gulf from TS dorian. Preliminary point temps pops College station (cll) 98 79 101 79 101 20 0 10 0 10 houston (iah) 94 80 97 80 98 60 10 10 10 10 galveston (gls) 89 84 91 85 91 60 30 30 10 10 Hgx watches warnings advisories Tx... None. Gm... None. Discussion... 43 |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| NCHT2 - 8770777 - Manchester, TX | 4 mi | 53 min | WSW 1.9 G 2.9 | 86°F | 88°F | 1011.9 hPa | ||
| MGPT2 - 8770613 - Morgans Point, TX | 19 mi | 53 min | SW 1.9 G 7 | 85°F | 87°F | 1012.3 hPa | ||
| EPTT2 - 8771013 - Eagle Point, TX | 28 mi | 53 min | WSW 2.9 G 5.1 | 85°F | 85°F | 1011.5 hPa | ||
| GRRT2 | 38 mi | 53 min | WNW 2.9 G 6 | 85°F | 85°F | 1011.7 hPa | ||
| GTOT2 | 41 mi | 53 min | W 2.9 G 6 | 84°F | 86°F | 1012.2 hPa | ||
| GNJT2 - 8771341 - Galveston Bay (North Jetty), TX | 42 mi | 53 min | WNW 1.9 G 4.1 | 87°F | 86°F | 1011.4 hPa | ||
| RLOT2 - 8770971 - Rollover Pass, TX | 46 mi | 47 min | NNW 7 G 8 | 85°F | 86°F | 1012.5 hPa | ||
| LUIT2 | 47 mi | 47 min | SW 7 G 8.9 | 85°F | 85°F | 1012 hPa |
Wind History for Morgans Point, TX
(wind in knots) EDIT (on/off) Help| 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | |
| Last 24hr | NE G10 | E G10 | SE | S G8 | SE | S | SE G11 | SE G13 | S G12 | S G12 | S G11 | S G9 | SW G7 | SW | SW | SW | SW | W | SW | SW | SW | SW | W | SW |
| 1 day ago | E G12 | E | SE G16 | SE | E | SE | SE G11 | SE G15 | SE G14 | SE G13 | SE | SE G13 | SE G13 | SE G13 | SE G11 | SW G8 | SW | W | E | NE | N | N | NE | NE |
| 2 days ago | SE G8 | S G7 | E G8 | S G8 | E | SE G11 | SE G17 | SE G17 | SE G16 | SE G15 | SE G15 | SE G15 | SE G19 | S G11 | S | S | S | S | S | SW | SW | S | S | N |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| John Dunn Helistop, TX | 4 mi | 70 min | N 0 | 10.00 mi | Mostly Cloudy | 88°F | 77°F | 70% | 1012.2 hPa |
| Houston, Houston Hobby Airport, TX | 7 mi | 2.2 hrs | W 3 | 10.00 mi | Mostly Cloudy | 82°F | 77°F | 85% | 1012.4 hPa |
| Houston / Ellington, TX | 12 mi | 3.2 hrs | N 0 | 10.00 mi | Mostly Cloudy | 81°F | 75°F | 84% | 1011.2 hPa |
| Houston, Pearland Regional Airport, TX | 16 mi | 2.2 hrs | WSW 3 | 10.00 mi | A Few Clouds | 82°F | 77°F | 85% | 1012.4 hPa |
| Houston Intercontinental Airport, TX | 16 mi | 2.2 hrs | WSW 5 | 10.00 mi | Mostly Cloudy | 84°F | 77°F | 80% | 1012 hPa |
| Houston Southwest Airport, TX | 18 mi | 90 min | N 0 | 10.00 mi | 83°F | 78°F | 87% | 1012.5 hPa | |
| Houston, Sugar Land Municipal / Hull Field Airport, TX | 19 mi | 2.2 hrs | N 0 | 10.00 mi | Mostly Cloudy | 82°F | 80°F | 94% | 1011.9 hPa |
Link to 5 minute data for KMCJ
Wind History from MCJ (wind in knots)
| 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | |
| Last 24hr | NE | Calm | NE | Calm | Calm | Calm | Calm | Calm | SW | G10 | Calm | Calm | W | Calm | Calm | Calm | W | Calm | Calm | |||||
| 1 day ago | N | NE G16 | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | N | N | Calm | N | NE | N | ||||
| 2 days ago | Calm | NE | G11 | Calm | Calm | G13 | NE | G10 | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm | Calm |
Tide / Current Tables for Lynchburg Landing, San Jacinto River, Texas
EDIT Weekend mode (on/off) (on/off) Help One Week of DataLynchburg Landing
Click for Map
Sun -- 01:42 AM CDT Moonrise
Sun -- 06:53 AM CDT Sunrise
Sun -- 10:37 AM CDT 1.31 feet High Tide
Sun -- 03:57 PM CDT Moonset
Sun -- 07:50 PM CDT Sunset
Sun -- 11:54 PM CDT -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 01:42 AM CDT Moonrise
Sun -- 06:53 AM CDT Sunrise
Sun -- 10:37 AM CDT 1.31 feet High Tide
Sun -- 03:57 PM CDT Moonset
Sun -- 07:50 PM CDT Sunset
Sun -- 11:54 PM CDT -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| 0.1 | 0.2 | 0.4 | 0.6 | 0.8 | 0.9 | 1.1 | 1.2 | 1.2 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.2 | 1.2 | 1.1 | 1 | 0.8 | 0.6 | 0.4 | 0.2 | 0.1 | 0 |
Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
EDIT (on/off) Help One Week of DataClear Lake
Click for Map
Sun -- 12:18 AM CDT -0.08 feet Low Tide
Sun -- 01:42 AM CDT Moonrise
Sun -- 06:53 AM CDT Sunrise
Sun -- 11:00 AM CDT 0.80 feet High Tide
Sun -- 03:56 PM CDT Moonset
Sun -- 07:50 PM CDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 12:18 AM CDT -0.08 feet Low Tide
Sun -- 01:42 AM CDT Moonrise
Sun -- 06:53 AM CDT Sunrise
Sun -- 11:00 AM CDT 0.80 feet High Tide
Sun -- 03:56 PM CDT Moonset
Sun -- 07:50 PM CDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
| 12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
| -0.1 | -0.1 | -0 | 0.1 | 0.2 | 0.4 | 0.6 | 0.7 | 0.7 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.7 | 0.7 | 0.7 | 0.6 | 0.6 | 0.4 | 0.2 | 0.1 | -0 |
Weather Map and Satellite Images
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GOES 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 (12,3,4,5)
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Ground Weather Radar Station Houston/Galveston, TX
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Gulf Stream Current
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Disclaimer: 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 numerious 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. |