Monday, March27, 2017 L-36.com


Marine Weather and Tides
Galveston, 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 7:12AMSunset 7:36PM Monday March 27, 2017 7:27 PM CDT (00:27 UTC) Moonrise 6:02AMMoonset 6:20PM Illumination 0% Phase: New Moon; Moon at 0 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- 332 Pm Cdt Mon Mar 27 2017
Tonight..South winds 10 to 15 knots. Seas 4 to 5 feet with occasional seas up to 6 feet.
Tuesday..Southeast winds 15 to 20 knots. Seas 4 to 5 feet with occasional seas up to 6 feet.
Tuesday night..Southeast winds around 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet.
Wednesday..Southeast winds 15 to 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. A chance of showers and Thunderstorms in the morning, then showers and Thunderstorms likely in the afternoon.
Wednesday night..South winds 15 to 20 knots decreasing to 10 to 15 knots after midnight. Seas 5 to 7 feet with occasional seas up to 8 feet. A chance of showers and Thunderstorms.
Thursday..West winds 5 to 10 knots. Seas 4 to 6 feet with occasional seas up to 7 feet. A chance of showers and Thunderstorms in the morning, then a slight chance of showers and Thunderstorms in the afternoon.
Thursday night..West winds 5 to 10 knots becoming northeast after midnight. Seas 3 to 5 feet.
Friday..Southeast winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Seas 2 to 4 feet.
Friday night..Southeast winds 15 to 20 knots. Seas 3 to 4 feet.
Saturday..Southeast winds 15 to 20 knots. Seas 5 to 6 feet with occasional seas up to 7 feet.
Saturday night..Southeast winds around 15 knots. Seas 6 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 332 Pm Cdt Mon Mar 27 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Onshore flow will strengthen Tuesday afternoon in advance of a storm system that swings through the region Wednesday into early Thursday morning. Small craft advisories will likely be required Tuesday afternoon through Wednesday. Offshore flow weakens quickly Thursday night followed by another moderate to strong onshore flow period that develops Friday night through Sunday.

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 272301
afdhgx
area forecast discussion
national weather service houston/galveston tx
601 pm cdt Mon mar 27 2017

Aviation
Looking for 900-2000ft CIGS to gradually fill back in across the
region overnight. Cloudiness should erode during the mid/late
morning hours as dry air starts mixing down. Sse winds will
increase to 15-25kt and gusty during the afternoon hours. 47

Prev discussion /issued 403 pm cdt Mon mar 27 2017/
the shortwave axis associated with the upper level disturbance
has shifted out of the region, with surface low centered north of
arkansas this afternoon. The trailing boundary behind this system
that was sliding southeastward and into southeast texas has began
to slow in speed. High pressure behind this feature has helped to
force this system southeastward as the pressure gradient between
the system's surface low and high pressure out in the west, began
to tighten. Short term guidance such as the hrrr, rap, and arw
have been over initializing coverage for this afternoon, but the
overall trend is consistent amongst the various models. Surface
winds behind this boundary are out of the northwest. There is
still a chance showers and thunderstorms could set up in the
southeast section of the cwa. If the precipitation does develop,
it could shift to the northwest as winds become more onshore this
evening. Although the forecast soundings, and short term higher
resolution models are all in agreement regarding this shower and
thunderstorm development, radar analysis has yet to be reflective
of these conditions. Will continue to monitor satellite and radar
for the possibility of development later this evening.

Dry conditions should prevail on Tuesday, as we begin to see a
separation between the temperature and dewpoint in the forecast
soundings. Precipitable water values will be below one inch closer
to the coast in the morning and into the afternoon hours. Late
afternoon Tuesday, the low levels begin to saturate in the northern
region of southeast texas, out ahead of the next upper level feature
as it pushes into north texas.

The storm prediction center has all of southeast texas under a
slight risk Wednesday. Both the ECMWF and GFS bring in multiple
positive vorticity maximums, with the first solenoid reaching the
northern portions of southeast texas late Wednesday morning. Higher
values of vorticity continue to stream in across southeast texas,
through Thursday. Forecast soundings still have precipitable waters
remaining fairly high with values between 1.5-1.8 inches. However,
the brunt of the showers and thunderstorms will begin Wednesday
morning in the western counties and exit the far eastern counties
by Thursday morning. A chance of showers and thunderstorms will
linger into late Thursday morning in the eastern most counties of
the cwa, and should mostly push out of the region by 15z. Guidance
consensus is still indicating a strong to severe threat will be
possible with this system. Favorable jet dynamics will be present,
as the 500 mb winds remain divergent over southeast texas. This
should allow for decent ventilation for convective initiation.

Forecast soundings also show CAPE values between 1500- 3000 j/kg
on Wednesday afternoon and into the evening, with SRH values also
ranging between 150-300 m^2/s^2.

Temperatures will be slight cooler behind the front Thursday, and
dewpoints will drop from in the 70s down into the 50s. Conditions
will stay fairly dry until late Friday afternoon when dew points
begin to rise once again into the upper 60s.

Continuing to track another upper level low moving into the region
late Saturday. Most of the precipitation associated with this low
should fall on Sunday. Still dealing with some disagreement
between models on the timing of this system, so kept pops in the
forecast through Monday. Hathaway
marine...

light to moderate south to southeast winds tonight will be
strengthening tomorrow and tomorrow night in response to
the developing storm system to our west. Caution/advisory
flags will likely be needed for the winds and also for the
building seas, especially tomorrow night and Wednesday.

Showers and thunderstorm are possible with Wednesday's
storm system, and they could linger into Wednesday night.

Winds and seas come back down behind this system, then
build once again back to caution/advisory levels starting
around Friday night as the next storm system begins to
organize out west. 42

Preliminary point temps/pops
College station (cll) 68 86 69 79 60 / 20 10 60 80 20
houston (iah) 68 85 71 82 66 / 10 10 40 80 40
galveston (gls) 72 82 73 79 70 / 10 10 10 70 50

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

Gm... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KXIH 25 mi32 min S 8 75°F 72°F
42035 - GALVESTON 22NM East of Galveston, TX 27 mi37 min SE 7.8 G 9.7 73°F 74°F3 ft1011.2 hPa (-1.1)72°F
GTOT2 40 mi39 min 74°F 73°F
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 41 mi39 min SE 8 G 8.9
GRRT2 43 mi39 min SSE 6 G 8.9 74°F 77°F1011.2 hPa
LUIT2 44 mi39 min E 6 G 8 74°F

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 mi32 minS 83.00 miFog/Mist75°F71°F89%1011.2 hPa

Wind History from XIH (wind in knots)
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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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Mon -- 02:34 AM CDT     1.88 feet High Tide
Mon -- 07:03 AM CDT     Moonrise
Mon -- 07:14 AM CDT     Sunrise
Mon -- 09:32 AM CDT     0.40 feet Low Tide
Mon -- 03:26 PM CDT     1.64 feet High Tide
Mon -- 07:22 PM CDT     Moonset
Mon -- 07:34 PM CDT     Sunset
Mon -- 09:29 PM CDT     0.59 feet Low Tide
Mon -- 09:59 PM CDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.71.81.91.71.51.10.80.60.40.40.60.81.21.41.61.61.51.210.70.60.60.8

Tide / Current Tables for Galveston (Pleasure Pier), Texas
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Galveston (Pleasure Pier)
Click for Map
Mon -- 03:18 AM CDT     1.91 feet High Tide
Mon -- 07:04 AM CDT     Moonrise
Mon -- 07:14 AM CDT     Sunrise
Mon -- 09:47 AM CDT     0.33 feet Low Tide
Mon -- 04:13 PM CDT     1.94 feet High Tide
Mon -- 07:22 PM CDT     Moonset
Mon -- 07:34 PM CDT     Sunset
Mon -- 09:59 PM CDT     New Moon
Mon -- 10:08 PM CDT     0.67 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.51.81.91.91.71.310.60.40.30.50.81.11.51.81.91.91.71.410.80.70.7

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 (20,4,5,8)
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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.