Thursday, August17, 2017 L-36.com


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 6:48AMSunset 7:57PM Thursday August 17, 2017 10:36 AM CDT (15:36 UTC) Moonrise 1:31AMMoonset 3:32PM Illumination 22% Phase: Waning Crescent; Moon at 25 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- 948 Am Cdt Thu Aug 17 2017
Today..South winds 10 to 15 knots. Seas 2 to 4 feet. A slight chance of showers and Thunderstorms in the morning.
Tonight..South winds 10 to 15 knots. Seas 2 to 3 feet. Isolated showers after midnight.
Friday..South winds 5 to 10 knots. Seas 2 to 3 feet. Isolated showers in the morning.
Friday night..South winds 10 to 15 knots. Seas 2 to 3 feet.
Saturday..Southwest winds 5 to 10 knots becoming south in the afternoon. Seas 1 to 2 feet. A slight chance of showers and Thunderstorms.
Saturday night..South winds 5 to 10 knots. Seas 1 to 2 feet.
Sunday..South winds 5 to 10 knots becoming southeast in the afternoon. Seas 1 to 2 feet. A slight chance of showers and Thunderstorms.
Sunday night..Southeast winds 10 to 15 knots decreasing to 5 to 10 knots after midnight. Seas 1 to 2 feet. A slight chance of showers and Thunderstorms.
Monday..Southeast winds 5 to 10 knots. Seas 1 to 2 feet. A chance of showers and Thunderstorms.
Monday night..Southeast winds 10 to 15 knots decreasing to 5 to 10 knots after midnight. 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 948 Am Cdt Thu Aug 17 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Moderate onshore winds and elevated seas will continue today. By the end of the week and on into the start of next week, expect lighter winds and lower seas as gulf of mexico high pressure edges closer to the northwest gulf.

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 171454
afdhgx
area forecast discussion
national weather service houston galveston tx
954 am cdt Thu aug 17 2017

Update
A heat advisory is in effect for the entire CWA through 7 pm this
evening. High temperatures in low 90s right along the coast to
near 100 across the brazos valley coupled with high humidity will
cause heat indices to rise into the 106-110 degree range this
afternoon. In addition to the afternoon heat, galveston is on
pace to once again set a record high minimum temperature for
today. Houston hobby and galveston both tied their monthly record
for record high minimum temperatures yesterday, indicating that
there has been little to no relief from the heat even during the
overnight hours.

Otherwise, a complex of thunderstorms currently over fwd's area
should continue to drift southeastward through the day today,
likely clipping portions of the piney woods region. This complex
has been fairly slow-moving so far, so some locally heavy rainfall
could be possible. However, no significant impacts are expected.

Across the rest of the area, some streamer showers are possible
this morning with perhaps a thunderstorm or two mixed in this
afternoon. 11

Prev discussion issued 652 am cdt Thu aug 17 2017
aviation... 12z taf
radar shows a few showers that may affect kuts and east of kiah
to kgls. Shower should be weakening and really do not expect much
if any activity during the day. Boundary layer flow becomes more
sw today and upper level ridge remains in place. Any MVFR
conditions at kcll kuts kcxo should be coming to an end withVFR
for the rest of the day and overnight. SREF probabilities showing
some lower ceilings again for the northern terminals so will
include mention of MVFR around 10z tomorrow.

Overpeck
prev discussion... Issued 419 am cdt Thu aug 17 2017
discussion...

a fairly complex pattern was in place over southeast texas early
this morning. An upper level low pressure trough at 200-300 mb
extended into the forecast area from the southern gulf of mexico.

A shear axis was in place over the western part of the upper
trough, mainly across the northern and central parts of the state.

This axis was co-located with a moisture axis where pws
approached 2.4 inches. A secondary moisture axis was over
southeast texas where pws approached 2 inches. Finally, an upper
level high pressure ridge extended across the northern gulf of
mexico to over the forecast area.

The main items of concern today include high heat index values and
chances for showers and thunderstorms. With the axis of higher
moisture just to the north and northwest, and with the secondary
axis overhead, dewpoints may stay high enough this afternoon for
the heat index to approach advisory levels (108 degrees). However,
model blends showed the potential for enough mixing for the heat
index to be a bit lower--mainly between 205 and 207 with an
isolated area of 108-109 here and there. It will be close, but am
not confident enough to issue an advisory at this time. Best
chances for showers and thunderstorms will be over the eastern
and northern counties. Isolated showers will be possible mainly
over the coastal counties and off the coast through mid morning.

May see the seabreeze get active later this morning and this
afternoon. Any storms that do develop will help alleviate the heat
at least temporarily. Enough moisture will remain overhead for
best rain chances over the eastern and northern areas once again
on Friday.

The models then show that the subtropical ridge aloft should build
over southeast texas; although, an approaching upper level trough
from over the gulf of mexico will help weaken the ridge on Sunday.

This should lead to diminished rain chances on Saturday and
Sunday. The upper level trough will then bring slightly cooler
temperatures and increase rain chances on Monday. The GFS and
ecmwf differ in the details but expected rain chances to persist
from Monday through the middle of the week as the upper level
trough shears out over or near southeast texas.

40
marine...

again there is not much change in the forecast for the upper texas
coast. Southerly winds should continue into the weekend. Winds have
increased to scec levels overnight and should continue this morning.

Winds should be decreasing Friday and into the weekend to closer to
10 knots. Seas currently running 4 to 5 feet and look for those seas
to slowly subside to around 2 to 4 feet for the weekend. Light winds
and low seas are expected for the start of next week.

Tide levels look to be near normal or a half foot above.

Overpeck

Preliminary point temps pops
College station (cll) 99 76 99 76 100 20 10 10 10 10
houston (iah) 96 78 97 78 97 20 10 20 10 20
galveston (gls) 92 83 92 82 91 20 10 20 10 20

Hgx watches warnings advisories
Tx... Heat advisory until 7 pm cdt this evening for the following
zones: austin... Brazoria... Brazos... Burleson... Chambers...

colorado... Fort bend... Galveston... Grimes... Harris...

houston... Jackson... Liberty... Madison... Matagorda...

montgomery... Polk... San jacinto... Trinity... Walker...

waller... Washington... Wharton.

Gm... None.

Discussion... 11


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GRRT2 9 mi49 min SSW 8.9 G 12 88°F 86°F1017.9 hPa
LUIT2 11 mi49 min SSW 8 G 11 88°F
GTOT2 13 mi49 min 88°F 88°F
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 18 mi55 min SW 15 G 16 86°F1017.3 hPa
EPTT2 - 8771013 - Eagle Point, TX 20 mi49 min SW 13 G 16 87°F 86°F1017.8 hPa
FCGT2 - 8772447 - USCG Freeport, TX 24 mi49 min S 11 G 14 87°F 87°F1018.1 hPa
KXIH 25 mi42 min SW 14 91°F 77°F
42035 - GALVESTON 22NM East of Galveston, TX 31 mi47 min SW 12 G 14 86°F 87°F4 ft1017.8 hPa (+1.4)79°F
MGPT2 - 8770613 - Morgans Point, TX 33 mi49 min SSW 8 G 12 87°F 87°F1017.8 hPa
RLOT2 - 8770971 - Rollover Pass, TX 33 mi49 min SW 8 G 13 89°F 84°F1017.9 hPa
NCHT2 - 8770777 - Manchester, TX 39 mi49 min SSW 2.9 G 13 87°F 85°F1017 hPa
LYBT2 39 mi49 min SSW 11 G 15 86°F 86°F1018 hPa
HIST2 42 mi49 min SSW 9.9 G 14 88°F 87°F1018.1 hPa
SGNT2 45 mi49 min S 9.9 G 14 87°F 86°F1017 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 mi45 minSSW 1210.00 miA Few Clouds89°F78°F70%1018.1 hPa

Wind History from GLS (wind in knots)
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Last 24hrS12
G20
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1 day agoSW12SW12S13S15S11S12S14S13S14S14S12S10S12S12S14S12S14S13S17S17S13S15
G20
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2 days agoS13SW12SW12S12S12S14S12S13S12S12S11S9S13S11S14S14S12S13S14S12S10S12S13S13
G19

Tide / Current Tables for Jamaica Beach, West Bay, Galveston Bay, Texas
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Jamaica Beach
Click for Map
Thu -- 02:31 AM CDT     Moonrise
Thu -- 05:46 AM CDT     1.07 feet High Tide
Thu -- 06:49 AM CDT     Sunrise
Thu -- 11:40 AM CDT     0.97 feet Low Tide
Thu -- 01:15 PM CDT     0.98 feet High Tide
Thu -- 04:31 PM CDT     Moonset
Thu -- 07:57 PM CDT     Sunset
Thu -- 10:59 PM CDT     -0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.30.50.811.11.11.111111110.90.90.70.50.30.1-0.1-0.2-0.2

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Thu -- 01:38 AM CDT     2.06 knots Max Flood
Thu -- 02:30 AM CDT     Moonrise
Thu -- 06:48 AM CDT     Sunrise
Thu -- 08:15 AM CDT     -0.00 knots Slack
Thu -- 11:05 AM CDT     -0.48 knots Max Ebb
Thu -- 12:15 PM CDT     -0.46 knots Min Ebb
Thu -- 04:31 PM CDT     Moonset
Thu -- 06:44 PM CDT     -2.09 knots Max Ebb
Thu -- 07:56 PM CDT     Sunset
Thu -- 11:11 PM CDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.6221.81.410.60.30.1-0.2-0.4-0.5-0.5-0.5-0.7-1-1.4-1.8-2-2.1-1.9-1.6-1-0.2

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 (11,2,3,4)
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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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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.