Thursday, January23, 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 7:14AMSunset 5:52PM Thursday January 23, 2020 5:14 AM CST (11:14 UTC) Moonrise 6:22AMMoonset 4:51PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 357 Am Cst Thu Jan 23 2020
Today..West winds 5 to 10 knots becoming northwest 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon. Patchy fog early in the morning.
Tonight..North winds 10 to 15 knots. Bay waters slightly choppy.
Friday..North winds 5 to 10 knots becoming west in the afternoon. Bay waters smooth.
Friday night..South winds around 5 knots becoming east after midnight. Bay waters smooth.
Saturday..East winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers in the late morning and afternoon.
Saturday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy. Showers likely until early morning, then a chance of showers and isolated Thunderstorms late.
Sunday..Northeast winds 5 to 10 knots. Bay waters smooth. A chance of showers in the morning. Isolated Thunderstorms. A slight chance of showers in the afternoon.
Sunday night..Northeast winds 5 to 10 knots. Bay waters smooth.
Monday..East winds 5 to 10 knots becoming southeast in the afternoon. Bay waters smooth.
Monday night..Southeast winds 5 to 10 knots. Bay waters smooth. A chance of showers late.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 357 Am Cst Thu Jan 23 2020
Synopsis for high island to matagorda ship channel out 60 nm.. Areas of fog may develop between now and mid morning in the wake of last nights weather system, but it should burn off toward mid morning. Seas remain elevated and will be very slow to fall today. Winds. West winds this morning will become northwest as a cold front pushes off the coast later today. Onshore winds should resume late Friday as high pressure moves to the east. Unsettled weather can be expected late Saturday into Sunday as a coastal low develops off the coast...then tracks east.


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 231021 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 421 AM CST Thu Jan 23 2020

SHORT TERM (Through Friday).

Showers and embedded thunderstorms have pushed off to the southeast and into the coastal waters. Light winds and wet ground in its wake will lead to some fog development early this morning and portions of the area could very well end up in a dense fog advisory in the next few hours . we'll keep an eye on the obs. Otherwise, expect fog and cloudiness to mix out during the mid and late morning hours. Light westerly winds will become nw and increase as a cool front and drier airmass makes it way thru the area. Mclr skies and seasonable temps are expected tonight and Friday as surface high pressure builds into the region. 47

LONG TERM (Friday night through Thursday).

The medium and long range period will be one of unseasonably warmer weather with periodic rain events primarily focused on Saturday night/Sunday and Tuesday.

Energy rotating eastward from a parent broad upper low over Baja /western (mainland of) Mexico will travel up the Texas coastline this weekend. A clear Friday evening and early Saturday will become cloudier from the southwest to northeast . with light precipitation around Matagorda Bay . during the day Saturday as this energy and main shallow open wave trough travel up the coast. An overcast end to Saturday with increasing probabilities for either light rain, drizzle or showers over the southern half and maritime regions late Saturday through Sunday. The highest rainfall amounts are predicted to fall over the Gulf, or just north and east of the lower level trough apex Sunday. While all southeastern Texas counties will pick up precipitation this looks to be a more wet day the further south you go; from around a quarter of an inch across the northern counties to between a half of an inch to an inch across the coastal counties. Weekend temperatures will start out in the near normal overnight 40s but will only cool into the much more mild 50s Sunday morning per the overcast and wet weather brought on by warm air advection. Days will warm into the upper 60s to lower 70s . or be around 10 degrees warmer than normal per late January standards.

Sunday's rain will come to an end by that evening; skies partially clearing out by Monday morning. The next shortwave trough will approach from a higher latitude . swinging into west Texas from the lower Rockies late Monday. Weak transitory ridging will make for a pleasant and dry Monday with morning temperatures falling on either side of 50 F and the afternoon warming to around 70 F. The approach and passage of the western upper shortwave trough on Tuesday will increase rain chances for showers and maybe some thunder. Have not totally bitten on high POPs on Tuesday mainly due to the significant differences between the very wet GFS and the very dry Euro. The tie-breaker Canadian is also dry so have trended POPs downward from the high deterministic GFS but yet higher than the dry Euro-weighted ensemble; low end chances for showers and isolated storms Tuesday. A cold front Wednesday will veer winds around to the northwest and introduce a cooler and drier mid-week air mass. The late period passage of a long wave trough does not look wet and will likely only fortify this Wednesday-Friday cooler and drier regional air mass. So, the period ends dry with subtle Thursday cooling, lower humidity and north winds. 31

MARINE.

Areas of fog may develop early this morning in the wake of last nights weather system, but should should dissipate toward mid morning. Seas remain quite elevated and will be very slow to fall today so will maintain a SCA for the Gulf waters and a beach hazard statement to cover high surf and the risk of rip currents. Westerly winds this morning will become northwest as a cold front pushes off the coast later today. Onshore flow should resume late Friday as high pressure moves to the east. Unsettled weather can then be expected late Saturday into Sunday as a coastal low develops off the coast . then tracks east. 47

AVIATION.

Low cigs and areas fog should redevelop over the I-45 TAF sites in the next few hours. Exactly how low is questionable, but guidance suggests IFR & possibly LIFR. Expect gradual improvement as we head into the late morning hours as we get some mixing. Would anticipate eroding cloudiness and VFR conditions areawide by early afternoon. Light west winds this morning will become northwest and increase to 10-20kt as a cool front makes its way into the area. Mclr skies are expected tonight and Fri. 47

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 65 40 66 40 69 / 10 0 0 0 10 Houston (IAH) 69 45 67 43 71 / 10 0 0 0 10 Galveston (GLS) 67 51 64 55 67 / 10 0 0 0 20

HGX WATCHES/WARNINGS/ADVISORIES. TX . NONE. GM . Small Craft Advisory until noon CST today 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 3 PM CST this afternoon 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.



Short/Marine/Aviation . 47 Long . 31


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCHT2 - 8770777 - Manchester, TX 4 mi62 min W 1.9 G 2.9 61°F 62°F1011.2 hPa
MGPT2 - 8770613 - Morgans Point, TX 19 mi62 min S 2.9 G 4.1 60°F 58°F1011.4 hPa
EPTT2 - 8771013 - Eagle Point, TX 28 mi62 min W 1.9 G 4.1 62°F 56°F1010.9 hPa
GRRT2 38 mi62 min NW 4.1 G 5.1 60°F 57°F1011.1 hPa
GTOT2 41 mi62 min Calm G 1.9 62°F 60°F1011.3 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 42 mi62 min W 1.9 G 2.9 62°F 58°F1010.4 hPa
RLOT2 - 8770971 - Rollover Pass, TX 46 mi56 min S 2.9 G 4.1 60°F 54°F1011.6 hPa
LUIT2 47 mi56 min WSW 4.1 G 5.1 61°F 60°F1012.8 hPa

Wind History for Morgans Point, TX
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for KMCJ

Wind History from MCJ (wind in knots)
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Calm5CalmCalmCalmCalmCalm3CalmCalm4NE7NE8NE12
2 days agoN10N7NE6N8N9N9N9N6
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Tide / Current Tables for Lynchburg Landing, San Jacinto River, Texas
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Lynchburg Landing
Click for Map
Thu -- 06:21 AM CST     Moonrise
Thu -- 07:14 AM CST     Sunrise
Thu -- 02:25 PM CST     -0.18 feet Low Tide
Thu -- 04:50 PM CST     Moonset
Thu -- 05:49 PM CST     Sunset
Thu -- 11:51 PM CST     1.48 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.41.41.31.21.21.110.90.70.50.30.1-0.1-0.2-0.2-00.20.40.711.21.41.5

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Thu -- 12:01 AM CST     0.53 feet High Tide
Thu -- 04:37 AM CST     0.40 feet Low Tide
Thu -- 06:21 AM CST     Moonrise
Thu -- 06:47 AM CST     0.42 feet High Tide
Thu -- 07:13 AM CST     Sunrise
Thu -- 03:41 PM CST     -0.77 feet Low Tide
Thu -- 04:51 PM CST     Moonset
Thu -- 05:50 PM CST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.50.50.40.40.40.40.40.40.30.1-0.1-0.3-0.5-0.6-0.7-0.8-0.7-0.5-0.3-00.20.40.4

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 (6,6,7,8)
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Ground Weather Radar Station Houston/Galveston, TX
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weather_mapweather_map weather_map

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.