Sunday, April23, 2017 L-36.com


Marine Weather and Tides
Jamaica Beach, TX

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:42AMSunset 7:52PM Sunday April 23, 2017 2:42 PM CDT (19:42 UTC) Moonrise 3:57AMMoonset 4:03PM Illumination 6% 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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GMZ355 Coastal Waters From Freeport To The Matagorda Ship Channel Out 20 Nm-coastal Waters From High Island To Freeport Out 20 Nm- 930 Am Cdt Sun Apr 23 2017
.small craft advisory in effect until 4 pm cdt this afternoon...
Rest of today..North 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..North winds 10 to 15 knots decreasing to 5 to 10 knots after midnight. Seas 2 to 4 feet subsiding to 1 to 2 feet after midnight.
Monday..Northeast winds around 5 knots becoming southeast in the afternoon. Seas 1 to 2 feet.
Monday night..South winds 10 to 15 knots. Seas 2 to 3 feet.
Tuesday..South winds 15 to 20 knots. Seas 2 to 4 feet.
Tuesday night..South winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 7 feet.
Wednesday..South winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 8 feet. A slight chance of showers and Thunderstorms in the morning.
Wednesday night..Southeast winds 10 to 15 knots becoming northeast after midnight. Seas 3 to 5 feet. A slight chance of showers and Thunderstorms in the evening.
Thursday..Southeast winds 10 to 15 knots. Seas 3 to 4 feet.
Thursday night..Southeast winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 7 feet. Isolated showers late.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 930 Am Cdt Sun Apr 23 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Strong offshore winds and elevated seas will gradually decrease through the day today. Onshore flow is expected to resume late Monday into Tuesday... With a brief period of offshore flow possible on Wednesday as a cold front approaches the waters. Onshore flow is expected to resume and strengthen late this week as a storm system develops over the high plains.

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 231713
afdhgx
area forecast discussion
national weather service houston/galveston tx
1213 pm cdt Sun apr 23 2017

Aviation
Vfr conditions are expected throughout the period with moderate
northerly winds going calm overnight before gradually becoming
onshore tomorrow.

11

Prev discussion /issued 949 am cdt Sun apr 23 2017/
discussion...

still a bit breezy at 9:30 am. The surface high over the pan
handle and west texas will drift into the central part of the
state this afternoon. As it does so, the surface pressure gradient
will relax and winds will diminish across SE texas. The current
forecast is on track.

40
prev discussion... /issued 352 am cdt Sun apr 23 2017/
discussion...

high pressure building into the region early this morning ushering
in much drier and cooler air. Today should be chamber of commerce
weather with mostly sunny skies... Northerly winds of 5-15 mph and
highs only reaching the lower to mid 70s. Quite the change from
the last few days of unusually warm and moist air for this time of
year. The high pressure system moves out into the gulf Monday
changing winds from light and variable to light southerly and
starting the week off with pleasant weather. As the week
progresses temperatures will again climb back well above normal
and moisture will increase. A fast moving pacific disturbance will
race east through the area Tuesday with an increase in clouds. A
quick dip in the jetstream on Wednesday will help to push a very
weak cold front down into the region - and could bring scattered
showers and thunderstorms to at least the northernmost portions of
the area. How strong the cap gets by that point should dictate the
southward extent of the storms given the pattern of late... It may
be strong enough to hamper deep convection as far north as
huntsville. Models have really been struggling with the flow
across the north pacific and ridging off the west coast the last
few days and hence the timing and strength of the system crossing
the central rockies has been varying quite a bit and these
dilemmas are evident with the Wednesday system. Some taking all
the way to nearshore waters and some stalling it just inland which
is a big change from runs 36-24 hours ago. In general though once
the system swings by Wednesday - heights rebound and it should
get hot. Thursday and Friday afternoon temperatures of 85-90
should be the norm with low level moisture trapped beneath a
potent cap. This will likely lead to some elevated heat index
readings of 92-99 degrees Thursday afternoon and again Friday.

Some rain relief should be headed toward the region next weekend
with a deepening upper trough over the 4 corners area that ejects
out and swings a cold front into and through the region with a
good chance of seeing widespread rainfall and maybe even some
strong springtime thunderstorms. But of course that is a week away
and the forecast is bound to change that far out.

Don't forget the sunscreen if you are going to be out and about
today enjoying the gorgeous weather.

45
marine...

strong offshore flow continues across the bays and gulf waters early
this morning in the wake of yesterday's cold front. Elevated winds
are expected to persist through most of the morning, decreasing
later this afternoon and evening as surface ridging builds farther
into texas. Have extended the small craft advisory through 4 pm for
the gulf waters with 5 to 7 feet waves persisting through mid-
afternoon. Northwest winds across the upper galveston bay have
resulted in tides falling near to slightly below astronomical
levels. Water levels may fall to near 1.5-2 feet below astronomical
tides, but a low water advisory is not expected at this time given
astronomical tides around 1-1.5 feet above mllw.

Onshore flow is expected to resume late Monday as surface ridging
slides east of the region, strengthening to caution or advisory
levels on Tuesday ahead of a cold front that may approach the coast
Wednesday. Medium range guidance indicates the possibility of this
cold front pushing just off the coast late Wednesday, but any
offshore flow would be brief as a storm system develops over the
high plains late week and promotes increasing onshore flow. As this
storm system ejects eastward late this week, another cold front may
make a run for the northwest gulf.

Huffman

Preliminary point temps/pops
College station (cll) 72 49 80 59 85 / 0 0 0 0 0
houston (iah) 74 52 83 61 85 / 0 0 0 0 10
galveston (gls) 73 63 75 69 78 / 0 0 0 0 10

Hgx watches/warnings/advisories
Tx... None.

Gm... Small craft should exercise caution until 4 pm cdt this
afternoon for the following zones: galveston bay...

matagorda bay.

Small craft advisory until 4 pm cdt this afternoon for the
following zones: 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.

Small craft should exercise caution from 4 pm this afternoon to
10 pm cdt this evening for the following zones: 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.

Discussion... 40
aviation/marine... 11


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GRRT2 9 mi43 min N 7 G 15 67°F 73°F1016.9 hPa (-1.8)
LUIT2 11 mi43 min NNW 8 G 13 66°F 73°F
GTOT2 13 mi43 min 64°F 74°F
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 18 mi43 min NW 11 G 18 74°F
EPTT2 - 8771013 - Eagle Point, TX 20 mi43 min N 9.9 G 14 65°F 74°F1017 hPa (-1.9)
FCGT2 - 8772447 - USCG Freeport, TX 24 mi43 min NW 7 G 11 69°F 74°F1017.8 hPa (-1.7)
KXIH 25 mi28 min N 8 G 17 70°F 50°F
42035 - GALVESTON 22NM East of Galveston, TX 31 mi53 min NW 14 G 19 63°F 75°F2 ft1017.1 hPa (-1.1)51°F
MGPT2 - 8770613 - Morgans Point, TX 33 mi43 min WNW 8.9 G 14 66°F 75°F1017.2 hPa (-1.7)
RLOT2 - 8770971 - Rollover Pass, TX 33 mi43 min NNW 13 G 17 65°F 75°F1016.9 hPa (-1.7)
NCHT2 - 8770777 - Manchester, TX 39 mi43 min NW 7 G 8.9 70°F 76°F1017.7 hPa (-1.9)
LYBT2 39 mi43 min N 16 G 19 66°F 76°F1016.5 hPa (-2.0)
HIST2 42 mi43 min NNW 11 G 21 67°F 76°F1016.9 hPa (-1.8)
SGNT2 45 mi43 min NW 11 G 14 70°F 75°F1017.1 hPa (-1.9)

Wind History for Galveston Pleasure Pier, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galveston, Scholes Field, TX8 mi51 minN 11 G 1910.00 miFair70°F50°F49%1017.5 hPa

Wind History from GLS (wind in knots)
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Last 24hrS13N12N12N14N17N19N17
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1 day agoS15S15S14S12S11S12S13S13S15S11S14S16S15
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2 days agoSE10S10S12SE10SE9SE9SE9SE11SE13SE14SE13SE11S10S10S10S12S13S14S14S13S14S17S16S15

Tide / Current Tables for Jamaica Beach, West Bay, Galveston Bay, Texas
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Jamaica Beach
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Sun -- 12:05 AM CDT     0.61 feet Low Tide
Sun -- 04:56 AM CDT     Moonrise
Sun -- 04:58 AM CDT     0.93 feet High Tide
Sun -- 06:45 AM CDT     Sunrise
Sun -- 12:07 PM CDT     0.40 feet Low Tide
Sun -- 05:02 PM CDT     Moonset
Sun -- 05:44 PM CDT     0.94 feet High Tide
Sun -- 07:51 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.60.70.80.90.90.90.80.70.60.50.40.40.40.50.70.80.90.90.90.80.70.60.5

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Sun -- 01:25 AM CDT     0.00 knots Slack
Sun -- 02:51 AM CDT     0.24 knots Max Flood
Sun -- 04:25 AM CDT     -0.00 knots Slack
Sun -- 04:55 AM CDT     Moonrise
Sun -- 06:44 AM CDT     Sunrise
Sun -- 08:46 AM CDT     -0.99 knots Max Ebb
Sun -- 12:26 PM CDT     0.00 knots Slack
Sun -- 03:12 PM CDT     1.05 knots Max Flood
Sun -- 05:02 PM CDT     Moonset
Sun -- 06:22 PM CDT     -0.00 knots Slack
Sun -- 07:50 PM CDT     Sunset
Sun -- 10:07 PM CDT     -0.90 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-0.10.10.20.1-0.2-0.5-0.8-1-1-0.9-0.6-0.20.30.8110.60.2-0.3-0.6-0.8-0.9-0.8

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 (15,3,4,5)
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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.