Saturday, August19, 2017 L-36.com


Marine Weather and Tides
Galveston, TX

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:49AMSunset 7:55PM Saturday August 19, 2017 5:58 AM CDT (10:58 UTC) Moonrise 3:29AMMoonset 5:24PM Illumination 8% Phase: Waning Crescent; Moon at 27 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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GMZ375 Waters From Freeport To The Matagorda Ship Channel From 20 To 60 Nm-waters From High Island To Freeport From 20 To 60 Nm- 317 Am Cdt Sat Aug 19 2017
Today..South winds 5 to 10 knots becoming southeast in the afternoon. Seas 2 feet.
Tonight..South winds 5 to 10 knots. Seas 2 feet.
Sunday..Southeast winds 5 to 10 knots becoming east in the afternoon. Seas 2 feet. A slight chance of showers and Thunderstorms in the morning.
Sunday night..Southeast winds around 10 knots. Seas 2 feet. A slight chance of showers and Thunderstorms.
Monday..East winds around 10 knots. Seas 2 feet. A chance of showers and Thunderstorms in the morning, then a slight chance of showers and Thunderstorms in the afternoon.
Monday night..Southeast winds 10 to 15 knots. Seas 2 feet.
Tuesday..East winds 5 to 10 knots. Seas 2 feet. A chance of showers and Thunderstorms.
Tuesday night..Southeast winds around 10 knots becoming 5 to 10 knots after midnight. Seas 2 to 3 feet.
Wednesday..Southeast winds around 5 knots becoming east in the afternoon. Seas 2 feet. A slight chance of showers and Thunderstorms.
Wednesday night..Southeast winds 5 to 10 knots. Seas 2 feet. A slight chance of showers and Thunderstorms.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 317 Am Cdt Sat Aug 19 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Lighter winds and lower seas can be expected over the weekend and into the middle of next week as an area of high pressure edges furthermore into the northwestern gulf. Rising rain chances are anticipated beginning early next week as a disturbance moves westward across the area.

7 Day Forecast for Marine Location Near Galveston, TX
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location: 28.84, -94.35     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 190927
afdhgx
area forecast discussion
national weather service houston galveston tx
427 am cdt Sat aug 19 2017

Discussion
Surface analysis shows a pretty weak pressure gradient so mainly
calm winds across SE texas this morning. This has allowed for
temperatures to drop into the mid upper 70s for rural areas, but
the houston urban heat island is in full force with temperatures
still in the low 80s. And then there is galveston holding onto the
mid 80s and heat index in the upper 90s.

Upper level analysis at 00z shows a fairly flat ridge across texas
and the northern gulf of mexico. An upper level trough was moving
across the midwest and great lakes. Out in the SE gulf over the
florida keys, water vapor imagery depicts a broad closed off tutt
which should continue to move west across the gulf as forecast.

Over the weekend the heat will still be the main headline. While
heat advisory will not be issued at this time since heat index
values are expected to be around 103 to 107, there still could be
a few areas that reach above 108 and an advisory could be issued
later today for the afternoon. The same can be said for Sunday.

The coming work week may actually be more wet than dry, but that
will largely hinge upon upper level ridging or the lack there of.

The tutt over the florida keys is expected to track towards the nw
gulf by Tuesday. This is about a day slower compared to
yesterday's forecast data so while rain chances are higher on
Monday than Tuesday, possible that the better rain chances could
be on Tuesday. Precipitable water values for the GFS go up from
1.7-1.8 inches on Monday to 1.9 on Tuesday. That said, the NAM is
the opposite with higher moisture on Monday. Still, the main idea
being that scattered showers and thunderstorms will be possible
both days. Viewing of the solar eclipse will still be in doubt for
areas around houston, but areas from college station to
huntsville should still have a good view.

Next Wednesday through Saturday the tutt over the NW gulf should
weaken and shear out between a trough over the great lakes and
ridging developing over the northern gulf. The trough does help a
front move into texas for the end of the week but still unsure
where exactly it stalls. The canadian and ECMWF seem to have the
front stall Friday along the coast or just offshore in the gulf.

Gfs still has the front inland but with a back door component that
could have the front stall from along i-10 at the tx la border
back NW towards c tx. With the front sagging south for the end of
the week, the forecast will hold onto mainly 20-30 pops with no
one day having any better chance than the other. Forecast going
forwards will try to pinpoint when higher rain chances will occur
with perhaps Friday being that day.

Overpeck

Tropics
Ir satellite imagery shows that TS harvey has a respectable
nocturnal flare up in convection as it continues to trek wnw
across the caribbean. There is not much change in the NHC forecast
track as landfall looks to be in belize early Tuesday. NHC does
have the remnants of harvey emerging in the bay of campeche early
Thursday, but difficult to know at what kind of intensity.

Synoptic models and ensemble guidance suggest the remnants could
organize again with a second landfall in mexico near tampico
towards the end of the week. This track make some sense with upper
level ridging expected to build over the northern gulf during
this time. That said, the track forecast is highly uncertain
considering the intensity of what's left of harvey are unknown and
hard to know how much land interaction will weaken the system.

Best course of action remains to monitor the situation and double
check preparedness plans.

Overpeck

Marine
No big changes to the marine forecast this evening. Observations
still indicate light winds out of the southwest with seas between 2-
3 feet. Seas should begin to lower to 1-2 feet later in the weekend,
due to the influence of high pressure located over the northwestern
gulf of mexico. Dry conditions can be expected through Sunday with
precip chances on the rise Monday as a disturbance approaches from
the southeast.

Additionally, little fluctuation in the tide forecast. Tides are
running right around normal to slightly above normal by a half foot
at times.

Hathaway

Preliminary point temps pops
College station (cll) 100 76 99 76 98 10 10 10 10 10
houston (iah) 98 77 96 78 94 10 10 20 10 30
galveston (gls) 91 82 90 82 89 10 10 20 10 30

Hgx watches warnings advisories
Tx... None.

Gm... None.

Discussion... 39
aviation marine... 08


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KXIH 25 mi24 min SW 11 88°F 77°F
42035 - GALVESTON 22NM East of Galveston, TX 27 mi59 min SW 12 G 16 85°F 87°F2 ft1015 hPa (-1.1)78°F
GTOT2 40 mi41 min 85°F 89°F
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 41 mi47 min SSW 8 G 8.9 86°F1014.9 hPa
GRRT2 43 mi41 min S 7 G 8.9 85°F 88°F1015.5 hPa
LUIT2 44 mi41 min SSW 8 G 11 85°F
RLOT2 - 8770971 - Rollover Pass, TX 47 mi41 min W 2.9 G 6 83°F 86°F1015.6 hPa

Wind History for Galveston Pleasure Pier, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
High Island 179A (Apache Corp), LA25 mi84 minSW 1410.00 miA Few Clouds88°F77°F70%1014.9 hPa

Wind History from XIH (wind in knots)
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1 day agoSW18SW14SW14SW13SW14SW11SW11SW12SW10SW9SW9SW8S9S8SW11S10S6S8
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Tide / Current Tables for Galveston Pleasure Pier, Gulf Of Mexico, Texas (sub)
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Galveston Pleasure Pier
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Sat -- 03:04 AM CDT     2.23 feet High Tide
Sat -- 04:30 AM CDT     Moonrise
Sat -- 06:49 AM CDT     Sunrise
Sat -- 08:31 AM CDT     1.73 feet Low Tide
Sat -- 11:43 AM CDT     2.04 feet High Tide
Sat -- 06:25 PM CDT     Moonset
Sat -- 07:54 PM CDT     Sunset
Sat -- 08:14 PM CDT     -0.40 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.82.12.22.22.11.91.81.71.71.8221.91.71.40.90.40-0.3-0.4-0.3-0.10.4

Tide / Current Tables for Galveston (Pleasure Pier), Texas
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Galveston (Pleasure Pier)
Click for Map
Sat -- 03:37 AM CDT     2.65 feet High Tide
Sat -- 04:30 AM CDT     Moonrise
Sat -- 06:49 AM CDT     Sunrise
Sat -- 09:37 AM CDT     1.68 feet Low Tide
Sat -- 12:47 PM CDT     1.85 feet High Tide
Sat -- 06:25 PM CDT     Moonset
Sat -- 07:54 PM CDT     Sunset
Sat -- 08:26 PM CDT     -0.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.522.42.62.62.52.321.81.71.71.71.81.81.81.51.20.70.3-0.1-0.3-0.3-00.4

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of SouthCentralPlains    EDIT
Geos

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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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.