Friday, February21, 2020
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Marine Weather and Tides
Jamaica Beach, 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 6:51AMSunset 6:13PM Friday February 21, 2020 9:31 AM CST (15:31 UTC) Moonrise 5:52AMMoonset 4:36PM Illumination 5% 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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GMZ355 Expires:202002212215;;867909 Fzus54 Khgx 210945 Cwfhgx Coastal Waters Forecast National Weather Service Houston/galveston Tx 345 Am Cst Fri Feb 21 2020 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. Gmz350-355-212215- Coastal Waters From Freeport To Matagorda Ship Channel Tx Out 20 Nm-coastal Waters From High Island To Freeport Tx Out 20 Nm- 345 Am Cst Fri Feb 21 2020
.small craft advisory in effect until 3 pm cst this afternoon...
Today..Northeast winds 15 to 25 knots becoming 15 to 20 knots in the afternoon. Seas 4 to 6 feet with occasional seas up to 7 feet.
Tonight..Northeast winds 10 to 15 knots. Seas 2 to 4 feet.
Saturday..East winds 5 to 10 knots. Seas 2 to 3 feet.
Saturday night..Southeast winds 10 to 15 knots. Seas 2 to 3 feet.
Sunday..Southeast winds 10 to 15 knots. Seas 2 to 3 feet.
Sunday night..South winds 10 to 15 knots. Seas 2 to 4 feet. A chance of showers late.
Monday..Southwest winds around 10 knots becoming northwest in the afternoon. Seas 2 to 4 feet. A chance of showers.
Monday night..North winds 10 to 15 knots. Seas 2 to 3 feet.
Tuesday..Northeast winds 5 to 10 knots becoming northwest 10 to 15 knots in the afternoon. Seas 2 to 3 feet.
Tuesday night..Northwest winds 20 to 25 knots becoming north 20 to 30 knots after midnight. Seas 3 to 5 feet.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 345 Am Cst Fri Feb 21 2020
Synopsis for high island to matagorda ship channel out 60 nm.. High pressure building into the state today will significantly weaken offshore winds and ultimately lower seas. Onshore winds return late Saturday and strengthen Sunday ahead of the next cold front. This weaker front will cross the gulf waters Monday night. A stronger cold frontal passage early Wednesday morning will raise advisory flags. Advisory conditions should persist through late that evening.


7 Day Forecast for Marine Location Near Jamaica Beach, TX
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location: 29.2, -94.99     debug


Area Discussion for - Houston/Galveston, TX
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FXUS64 KHGX 211124 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 524 AM CST Fri Feb 21 2020

AVIATION. VFR. Clear skies. Surface high pressure moving across will continue to weaken northerly winds through the day. Late period (early Saturday) cirrus with light easterlies. 31

PREV DISCUSSION. /ISSUED 325 AM CST Fri Feb 21 2020/

SHORT TERM [Today through Saturday] .

The slow southeastern movement of the large 1040 mb Southern Plains High into the state will weaken this recently strong offshore pressure gradient. This will gradually lower surface northerlies to under 10 knots through the day. A northern 1.3 to 1.5 inch pwat air mass descending into eastern state will lower mid to lower level humidity to 50% or under and ensure mainly clear skies through early Saturday evening. High cloudiness Saturday as cirrus rides up and over transitory upper ridging. While northerly winds will significantly weaken under sunny skies today, cold air advection will keep today's temperatures cool; mid to late afternoon low to mid 50s. Weak easterly breezes and mainly clear early Saturday morning skies will allow for decent radiative cooling; interior lower to middle 30 / coastal lower 40 minimum temperatures. Early Saturday easterly winds will gradually veer back onshore by the late afternoon and assist in warming daytime temperatures back up to near 60 F. 31

LONG TERM [Saturday Night through Thursday] .

High pressure continues to move off to the east and onshore winds strengthen Saturday night and Sunday resulting in increasing clouds and rising humidities. Some showers might pop up Sunday afternoon and evening way up north, but the area's next best rain chances look to come late Sunday night through Monday with the approach and passage of our next cold front. Before the front's arrival, a warming trend can be expected (highs most locations in the 60s on Sunday and in the 70s on Monday). After a cool Tuesday morning in the wake of the front, we should warm up back close to 70 before the next front moves through the area (it should be too dry for any rain with this boundary) and cools us back down. A general northwest flow aloft behind this front will bring our area cool temperatures (lows mainly in the 30s/40s and highs mainly in the 50s/60s) and dry weather with mostly clear to clear skies for the remainder of the week. 42

MARINE .

Early day Gulf wind gusts have remained under gale force. Therefore have lowered the Gulf Gale Warning to a Small Craft Advisory and have kept the local bays in a Small Craft Exercise Caution. Weakening northerlies through the day will have nearshore Gulf Advisory flags dropping off early this afternoon . offshore flags expiring at sunset. Morning significant wave heights in the 5 to 6 feet nearshore . 7 to 9 ft offshore range will fall to around 3 feet nearshore and 5 to 6 feet offshore by this evening. Weak east- southeast winds Saturday will create 2 to 3 foot seas with a strengthening onshore flow Sunday picking early week average seas back up to around 3 to 4 feet. There will be two frontal passages next week; a weaker front Monday night followed by a much stronger frontal passage 24 hours later Tuesday night into Wednesday morning. Offshore winds late Monday into Tuesday may briefly touch Caution criteria but a much colder air mass following behind the mid week cold front will significantly strengthen northerlies and elevate seas. 31

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 54 34 59 46 66 / 0 0 0 0 20 Houston (IAH) 55 34 59 47 67 / 0 0 0 0 10 Galveston (GLS) 54 41 56 54 67 / 0 0 0 0 0

HGX WATCHES/WARNINGS/ADVISORIES. TX . NONE. GM . SMALL CRAFT SHOULD EXERCISE CAUTION until noon CST today for the following zones: Galveston Bay . Matagorda Bay.

Small Craft Advisory until 3 PM CST this afternoon 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 6 PM CST this evening 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.



Discussion . 42 Aviation/Marine . 31


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GRRT2 9 mi50 min ENE 25 G 30 44°F 51°F1036.3 hPa
LUIT2 11 mi44 min NNE 21 G 27 46°F 1038.2 hPa
GTOT2 13 mi50 min NE 17 G 23 43°F 56°F1036.6 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 18 mi50 min NNE 23 G 26 42°F 56°F1035.4 hPa
EPTT2 - 8771013 - Eagle Point, TX 20 mi50 min NNE 17 G 23 44°F 53°F1036.6 hPa
FCGT2 - 8772447 - USCG Freeport, TX 24 mi44 min NNE 17 G 24 45°F 58°F1037.4 hPa
FPST2 24 mi50 min N 19 G 23 44°F 62°F1036.5 hPa
KXIH 25 mi17 min NNE 25 45°F 43°F
42035 - GALVESTON 22NM East of Galveston, TX 31 mi22 min 21 G 27 1037.5 hPa
MGPT2 - 8770613 - Morgans Point, TX 33 mi50 min NNE 14 G 19 42°F 58°F1037.6 hPa
RLOT2 - 8770971 - Rollover Pass, TX 33 mi44 min NE 18 G 23 42°F 45°F1037 hPa
NCHT2 - 8770777 - Manchester, TX 39 mi50 min N 7 G 12 43°F 59°F1037.4 hPa
HIST2 42 mi50 min NNE 15 G 19 41°F 55°F1036.6 hPa
SGNT2 45 mi44 min N 13 G 20 45°F 58°F1036.7 hPa

Wind History for Galveston Pleasure Pier, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galveston, Scholes Field, TX8 mi40 minNNE 20 G 2810.00 miFair and Breezy46°F32°F58%1037 hPa

Link to 5 minute data for KGLS

Wind History from GLS (wind in knots)
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2 days agoSE6SE73SE8SE5E4CalmNE4E4NE3E4E7SE7CalmN3N7N12N10N13N11N12N13N14N14

Tide / Current Tables for Jamaica Beach, West Bay, Galveston Bay, Texas
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Fri -- 12:27 AM CST     -0.53 knots Max Ebb
Fri -- 01:32 AM CST     -0.51 knots Min Ebb
Fri -- 05:51 AM CST     Moonrise
Fri -- 06:53 AM CST     Sunrise
Fri -- 08:06 AM CST     -1.93 knots Max Ebb
Fri -- 12:34 PM CST     0.00 knots Slack
Fri -- 04:10 PM CST     1.86 knots Max Flood
Fri -- 04:35 PM CST     Moonset
Fri -- 06:12 PM CST     Sunset
Fri -- 10:36 PM CST     -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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-0.5-0.5-0.5-0.6-0.9-1.3-1.6-1.8-1.9-1.9-1.6-1.2-0.50.41.21.71.91.81.51.310.70.3-0.2

Weather Map
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wmap_A
GEOS Local Image of SouthCentralPlains    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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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.