Saturday, March25, 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 7:14AMSunset 7:35PM Saturday March 25, 2017 10:43 AM CDT (15:43 UTC) Moonrise 4:42AMMoonset 4:19PM Illumination 4% 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 Coastal Waters From Freeport To The Matagorda Ship Channel Out 20 Nm-coastal Waters From High Island To Freeport Out 20 Nm- 345 Am Cdt Sat Mar 25 2017
.small craft should exercise caution...
Today..South winds 15 to 20 knots becoming southwest 10 to 15 knots in the morning, then becoming west 5 to 10 knots in the afternoon. Seas 4 to 6 feet with occasional seas up to 7 feet. A chance of showers and Thunderstorms after midnight.
Tonight..South winds 5 to 10 knots increasing to 10 to 15 knots after midnight. Seas 2 to 4 feet.
Sunday..South winds 10 to 15 knots. Seas 3 to 5 feet.
Sunday night..South winds 15 to 20 knots. Seas 3 to 5 feet.
Monday..South winds 10 to 15 knots. Seas 3 to 5 feet.
Monday night..South winds 10 to 15 knots. Seas 3 to 4 feet.
Tuesday..Southeast winds 10 to 15 knots. Seas 3 to 4 feet.
Tuesday night..Southeast winds 15 to 20 knots. Seas 3 to 5 feet.
Wednesday..South winds 15 to 25 knots. Seas 5 to 7 feet with occasional seas up to 8 feet. A chance of showers and Thunderstorms.
Wednesday night..South winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 8 feet. A chance of showers and Thunderstorms.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 345 Am Cdt Sat Mar 25 2017
Synopsis for high island to matagorda ship channel out 60 nm.. The moderate to strong onshore winds are expected to slowly diminish today ahead of an approaching weak front. The front is expected to approach the coastal waters but is forecast to stall inland. Weaker onshore winds are expected over the weekend.

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 251119
afdhgx
area forecast discussion
national weather service houston/galveston tx
619 am cdt Sat mar 25 2017

Aviation
Cold front was moving into the houston metro area at 11z. Expect
that the line of showers and isolated thunderstorms will move past
iah and hou by 13z, klbx by 14z, and kgls between 14z and 15z. The
front may slow down as it reaches the coast or continue its
current speed; however, the latest nam12 slows the front down
right along the coastline before returning it back inland.

Actually like the latest hrrr and catered the terminals close to
its output. Am expectingVFR conditions by late morning.

There is an outside chance that MVFR to ifr conditions could
develop away from the coast late tonight. Guidance may be a bit
overdone and went closer to the raw model output.

40

Prev discussion /issued 407 am cdt Sat mar 25 2017/
discussion...

se tx is getting a brief respite after an active night of storms.

A weak cold front that extends from near paris to waco to ozona
will continue to push east and should move into SE tx prior to
sunrise. The front is expected to trigger additional showers and
thunderstorms... With the precip becoming more numerous as the
front nears the coast. Short term guidance is very bullish with
high rain chances this morning. Will be watching trends closely
and if short term guidance is correct, the radar should begin to
start lighting up around 4 am. Conds should dry out quickly as
drier air moves into SE tx. Pw values are progged to fall to 0.60
inches by afternoon. Clear skies are expected tonight with some
light ground fog possible in rural areas toward sunrise.

On Sunday a weak area of low pressure will develop over north
texas and this feature will drag a weak cold front across the
state late Sunday night into Monday. The front should stall before
reaching SE tx. A strong upper level disturbance will move across
the southern plains Sunday night and this feature might be close
enough to generate a few showers and thunderstorms over mainly
the northern half of SE tx. Fcst soundings show a capping
inversion near 850 mb and very dry air above 850 mb. Fcst
soundings show a weak capping inversion in place through Tuesday
with moisture profiles looking rather meager. A slight warming at
850 mb supports slightly warmer sfc temps both Monday/Tuesday.

Another potent upper level low will approach texas on Wednesday.

This feature is trending much further north than yesterdays model
runs. Global models are in good agreement that the low will track
northeast across the southern plains. Jet dynamics still look
impressive with this feature and SE tx will lie in a splitting jet
structure. Pw values now only increase to around 1.55 inches (was
1.80 inches yesterday). There should still be enough lift to
generate shra/tsra on Wednesday but the threat for severe wx/heavy
rainfall has diminished somewhat. SPC has shifted their outlook
for Wednesday further north. A weak disturbance rotating around
the broad upper low may bring some showers/storms to the area wed
night and Thursday before conditions dry out on Friday. Low
pressure will develop over west texas on Friday and approach the
region on Saturday. The low will drag a cold front across the
region and bring another chance of shra/tsra. 43
marine...

the moderate to strong onshore winds are expected to diminish this
morning as the surface pressure gradient diminishes ahead of a weak
cold front. Another round of showers will be possible later this
morning ahead of the front. Westerly winds may briefly develop
later today over the gulf waters and bays; however, onshore winds
are expected to return by Sunday.

Another system moving across the plains will help strengthen the
onshore winds Sunday night. Another system will help develop
moderate to strong onshore winds again Tuesday night, Wednesday, and
Wednesday night. Although caution conditions are expected Sunday
night, advisory conditions will be possible beginning on Wednesday.

40

Preliminary point temps/pops
College station (cll) 77 57 85 66 84 / 10 10 10 20 10
houston (iah) 82 61 85 68 86 / 20 10 10 10 10
galveston (gls) 77 69 82 71 81 / 50 10 10 10 10

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

Gm... Small craft should exercise caution until 10 am cdt this morning
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... Galveston bay...

matagorda bay.

Small craft advisory until 10 am cdt this morning for the
following zones: 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... 43
aviation/marine... 40


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GRRT2 9 mi43 min SW 14 G 17 74°F 73°F1016.7 hPa (+1.2)
LUIT2 11 mi43 min SW 11 G 14 74°F 72°F
GTOT2 13 mi43 min 74°F 70°F
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 18 mi43 min SSW 17 G 20 78°F 70°F
EPTT2 - 8771013 - Eagle Point, TX 20 mi43 min WSW 11 G 19 75°F 73°F1016.2 hPa (+1.1)
FCGT2 - 8772447 - USCG Freeport, TX 24 mi43 min SSW 11 G 14 74°F 71°F1017.2 hPa (+1.2)
KXIH 25 mi28 min WSW 18 77°F 70°F
42035 - GALVESTON 22NM East of Galveston, TX 31 mi53 min SW 9.7 G 12 71°F 71°F5 ft1016.8 hPa (+1.5)70°F
MGPT2 - 8770613 - Morgans Point, TX 33 mi43 min NW 8.9 G 12 71°F 74°F1016.5 hPa (+1.8)
LYBT2 39 mi43 min N 8 G 11 69°F 72°F1015.9 hPa
NCHT2 - 8770777 - Manchester, TX 39 mi43 min WNW 5.1 G 8.9 71°F 72°F1016.9 hPa (+1.8)
HIST2 42 mi43 min SSW 12 G 20 74°F 74°F1016.3 hPa (+0.8)
SGNT2 45 mi43 min SSW 8.9 G 11 73°F 74°F1016.7 hPa (+1.2)

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 minSSW 14 G 224.00 miMostly Cloudy with Haze76°F71°F85%1016.8 hPa

Wind History from GLS (wind in knots)
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Last 24hrSE17SE18SE17SE21
G26
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1 day agoS10S11S11SE12SE15SE15SE14SE15SE12SE14SE16SE18SE16SE16SE16SE16SE15S16S15S16S16S13S15SE13
2 days agoS8S8S7S8S9S8S10SE11S9S9S7SE7S8S9S9S8S11S10S10S10SE8S9S9SE11

Tide / Current Tables for Jamaica Beach, West Bay, Galveston Bay, Texas
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Jamaica Beach
Click for Map
Sat -- 12:35 AM CDT     0.67 feet Low Tide
Sat -- 04:39 AM CDT     0.84 feet High Tide
Sat -- 05:42 AM CDT     Moonrise
Sat -- 07:17 AM CDT     Sunrise
Sat -- 12:39 PM CDT     0.08 feet Low Tide
Sat -- 05:18 PM CDT     Moonset
Sat -- 06:58 PM CDT     0.86 feet High Tide
Sat -- 07:34 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.70.70.80.80.80.80.70.60.40.30.20.10.10.20.30.50.70.80.90.80.80.70.6

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Sat -- 12:09 AM CDT     -0.56 knots Max Ebb
Sat -- 02:54 AM CDT     -0.28 knots Min Ebb
Sat -- 05:41 AM CDT     Moonrise
Sat -- 07:16 AM CDT     Sunrise
Sat -- 08:54 AM CDT     -1.34 knots Max Ebb
Sat -- 12:58 PM CDT     0.00 knots Slack
Sat -- 04:08 PM CDT     1.40 knots Max Flood
Sat -- 05:17 PM CDT     Moonset
Sat -- 07:33 PM CDT     Sunset
Sat -- 09:04 PM CDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.6-0.5-0.3-0.3-0.4-0.6-0.9-1.1-1.3-1.3-1.3-1-0.600.71.21.41.310.70.30-0.2-0.5

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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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 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.