Wednesday, July26, 2017

Marine Weather and Tides
Jamaica Beach, 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 6:34AMSunset 8:16PM Tuesday July 25, 2017 11:37 PM CDT (04:37 UTC) Moonrise 7:58AMMoonset 9:11PM Illumination 7% Phase: Waxing Crescent; Moon at 3 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 Coastal Waters From Freeport To The Matagorda Ship Channel Out 20 Nm-coastal Waters From High Island To Freeport Out 20 Nm- Waters From Freeport To The Matagorda Ship Channel From 20 To 60 Nm-waters From High Island To Freeport From 20 To 60 Nm- 1006 Pm Cdt Tue Jul 25 2017
Rest of tonight..Southeast winds 10 to 15 knots. Seas 2 to 3 feet. A slight chance of showers and Thunderstorms.
Wednesday..Southeast winds around 10 knots. Seas 2 to 3 feet. A slight chance of showers and Thunderstorms.
Wednesday night..South winds 10 to 15 knots. Seas 2 feet. A slight chance of showers and Thunderstorms after midnight.
Thursday..South winds 5 to 10 knots. Seas 2 feet. A slight chance of showers and Thunderstorms.
Thursday night..South winds 10 to 15 knots. Seas 2 feet.
Friday..Southwest winds 5 to 10 knots. Seas 2 feet.
Friday night..Southwest winds 10 to 15 knots. Seas 2 feet.
Saturday..Southwest winds 10 to 15 knots decreasing to 5 to 10 knots in the afternoon. Seas 2 feet. A slight chance of showers and Thunderstorms.
Saturday night..Southwest winds around 10 knots. Seas 2 feet. A slight chance of showers and Thunderstorms.
Sunday..West winds 5 to 10 knots becoming south in the afternoon. Seas 1 to 2 feet. A chance of showers and Thunderstorms.
Sunday night..Southeast winds 5 to 10 knots. Seas 1 to 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 1006 Pm Cdt Tue Jul 25 2017
Synopsis for high island to matagorda ship channel out 60 nm.. High pressure over the gulf of mexico and a low pressure trough over west texas will help keep light to occasionally moderate onshore winds across the upper texas coastal waters through the end of the week.

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 260201
area forecast discussion
national weather service houston galveston tx
901 pm cdt Tue jul 25 2017

High pressure over southern la and a trough of low pressure over
eastern co will maintain light onshore winds tonight. Winds may
not fully decouple over the western half of the v+cwa where the
gradient looks tighter. Shra tsra continue to develop in a
corridor of deeper moisture that extends from about hempstead to
freeport and then offshore. An 850 mb high was located over the
north central gulf and deeper moisture was rotating into SE tx on
the back side of this feature. At 300 mb, there was a well defined
albeit weak trough axis that extends into SE tx. The combination
of the upper level feature and deeper moisture should allow for
additional showers overnight, mainly over the marine zones and
adjacent coast. Have increased pops slightly for tonight and
bumped up mins a bit due to mixing out west and more cloud cover
toward the coast.

Also bumped pops up to 30 percent for areas south of houston on
Wednesday and feel this still might be too low. An upper level
disturbance will move across SE tx on Wednesday and coupled with
an increase in moisture (pw values reach 2.15 inches) and a subtle
weakness aloft will trigger shra tsra on Wednesday afternoon.

Numerical guidance not too impressive but other parameters suggest
higher rain chances. 43

Prev discussion issued 648 pm cdt Tue jul 25 2017

moisture channel over SE texas can be seen by satellite derived
pws of 2 inches nudging inland between kgls and klbx and by the
isolated to scattered showers and thunderstorms inland to west of
kcxo. Expect these to diminish by 01z to 02z with the lost of
solar heating; however, with the higher moisture available
isolated showers could linger into the mid evening. Not as
confident that the showers will make it as far east as kiah and
kcxo or as far inland as kcll and kuts.

Model data and statistical output suggests at least a scattered
MVFR deck after 09z. Confidence in any more coverage than that was
low. There is a slight chance for MVFR due to restricted
visibility or to ceilings -- confidence is low but best
possibility looks to be kcll and possibly klbx and ksgr. For
WednesdayVFR conditions with at least a slight chance of showers
and thunderstorms after 17z.

prev discussion... Issued 355 pm cdt Tue jul 25 2017

khgx radar has been fairly quiet today... Except for a stray shra
near eagle lake earlier this afternoon. All in all, it does look
like the combination of slightly lower pws weak upper level ridging
is currently helping to keep things quiet across SE tx. But we
are starting to see some changes offshore. Strengthening flow from
the gulf will be drawing slightly deeper moisture (pws near 2.2")
into the area tonight through tomorrow. Combined with daytime
heating and perhaps the seabreeze, isolated to widely scattered
activity will be possible. As this surge of moisture mixes out and
high pressure builds back into the area, rain chances to lower a
bit as temps heat indicies climb a bit for thurs Friday. Heat
index values are progged range from 105 to 110f during this time
frame... But we will have to keep an eye on things Saturday.

Models remain very consistent with bringing a cold front through
the region from the NE on sat. While there is still a certain amount
of skepticism with this scenario... It is getting harder to ignore
the long range guidance. That being said, the big concern with
this boundary looks to be the progged pws of 2.2-2.6" along and
ahead of the front and where it could potentially stall. For now
will keep with chc pops for this time frame. Also of note is the
possibility of very warm temps Sat afternoon given the insolation
ahead of this boundary. 41

wind speeds will approach scec conditions this evening, but should
remain right below criteria. With high pressure in control, a
typical summer like pattern can be expected, with occasionally
scattered showers in the afternoon hours during peak day time
heating. Light to moderate south to southeast winds with wave
heights between 2 to 3 feet can be expected through Wednesday,
eventually dropping to 2 feet through Saturday. A weak boundary
will push into the bays and nearshore waters early Sunday morning
with northerly winds filling in behind this passage.


Preliminary point temps pops
College station (cll) 77 99 77 100 78 10 20 10 10 10
houston (iah) 78 95 77 97 78 10 20 10 10 10
galveston (gls) 82 89 82 93 82 20 20 10 20 10

Hgx watches warnings advisories
Tx... High rip current risk from 8 am cdt Wednesday through Wednesday
evening for the following zones: brazoria... Chambers...


Gm... None.

Discussion... 43

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GRRT2 9 mi50 min SSE 9.9 G 12 81°F 87°F1019.8 hPa
LUIT2 11 mi50 min E 8 G 11 83°F
GTOT2 13 mi50 min 84°F
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 18 mi50 min S 9.9 G 13
EPTT2 - 8771013 - Eagle Point, TX 20 mi50 min SSW 12 G 14 84°F 87°F1019.7 hPa
FCGT2 - 8772447 - USCG Freeport, TX 24 mi50 min SSE 11 G 14 86°F 85°F1019.8 hPa
KXIH 25 mi43 min S 16 86°F 77°F
42035 - GALVESTON 22NM East of Galveston, TX 31 mi48 min S 14 G 16 86°F 86°F3 ft1019.6 hPa (+1.3)79°F
MGPT2 - 8770613 - Morgans Point, TX 33 mi50 min SSE 8 G 15 82°F 87°F1019.5 hPa
RLOT2 - 8770971 - Rollover Pass, TX 33 mi50 min S 5.1 G 11 85°F 85°F1019.9 hPa
NCHT2 - 8770777 - Manchester, TX 39 mi50 min S 7 G 8.9 84°F 87°F1018.5 hPa
LYBT2 39 mi50 min S 7 G 14 83°F 87°F1019.6 hPa
HIST2 42 mi50 min S 5.1 G 8 84°F 86°F1020 hPa
SGNT2 45 mi50 min SSE 13 G 16 86°F 88°F1018.8 hPa

Wind History for Galveston Pleasure Pier, TX
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galveston, Scholes Field, TX8 mi46 minSSW 710.00 miA Few Clouds80°F70°F71%1019.9 hPa

Wind History from GLS (wind in knots)
Last 24hrS9S9S10S11S9S8S9S9S8S8S7S8S9S9SE10SE9S9SE11SE10SE10SE7SE9S18
1 day agoS11SW14S12
2 days agoS11S12S13S15SW13SW11SW10SW15

Tide / Current Tables for Jamaica Beach, West Bay, Galveston Bay, Texas
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Jamaica Beach
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Wed -- 04:12 AM CDT     -0.14 feet Low Tide
Wed -- 06:37 AM CDT     Sunrise
Wed -- 09:58 AM CDT     Moonrise
Wed -- 10:56 AM CDT     0.92 feet High Tide
Wed -- 05:32 PM CDT     0.59 feet Low Tide
Wed -- 08:15 PM CDT     Sunset
Wed -- 09:13 PM CDT     0.75 feet High Tide
Wed -- 10:50 PM CDT     Moonset
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
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Wed -- 12:27 AM CDT     -1.81 knots Max Ebb
Wed -- 04:43 AM CDT     0.00 knots Slack
Wed -- 06:36 AM CDT     Sunrise
Wed -- 07:52 AM CDT     1.63 knots Max Flood
Wed -- 09:57 AM CDT     Moonrise
Wed -- 01:43 PM CDT     -0.00 knots Slack
Wed -- 04:15 PM CDT     -0.44 knots Max Ebb
Wed -- 07:07 PM CDT     -0.12 knots Min Ebb
Wed -- 08:14 PM CDT     Sunset
Wed -- 10:49 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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

GOES Local Image of SouthCentralPlains    EDIT

Wind Forecast for Houston/Galveston, TX (0,6,7,8)
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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 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 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.