Wednesday, June28, 2017 L-36.com


Marine Weather and Tides
San Leon, 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 6:21AMSunset 8:24PM Wednesday June 28, 2017 7:20 AM CDT (12:20 UTC) Moonrise 10:14AMMoonset 11:17PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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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GMZ335 Galveston Bay- 439 Am Cdt Wed Jun 28 2017
Today..East winds 10 to 15 knots. Bay waters slightly choppy. Isolated Thunderstorms in the morning. Showers likely. Thunderstorms likely in the afternoon.
Tonight..Southeast winds 10 to 15 knots becoming south after midnight. Bay waters slightly choppy. Isolated Thunderstorms in the evening. A chance of showers. A chance of Thunderstorms after midnight.
Thursday..South winds 10 to 15 knots. Bay waters slightly choppy. Showers and Thunderstorms likely.
Thursday night..South winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers and isolated Thunderstorms.
Friday..South winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers and Thunderstorms.
Friday night..South winds 10 to 15 knots. Bay waters slightly choppy.
Saturday..South winds 10 to 15 knots. Bay waters slightly choppy.
Saturday night through Sunday night..South winds 5 to 10 knots. Bay waters smooth.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 439 Am Cdt Wed Jun 28 2017
Synopsis for high island to matagorda ship channel out 60 nm.. A coastal trough of low pressure will maintain moderate onshore winds through Friday. Tide levels will also likely increase and some minor coastal flooding will be possible. Seas will build this afternoon through Thursday.

7 Day Forecast for Marine Location Near San Leon, TX
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location: 29.48, -94.92     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 281006
afdhgx
area forecast discussion
national weather service houston galveston tx
506 am cdt Wed jun 28 2017

Discussion
Scattered showers and isolated thunderstorms will continue to
develop across the gulf waters and coastal zones throughout the
morning thanks to a weak coastal trough extending down the tx
coast. Models are suggesting a coastal low may develop along this
trough later this morning, and the location of this low will have
a large impact on the location and amounts of rainfall for the
area today. Right now, it looks like most of the rainfall will
stay over the waters and right along the coastal zones, with
perhaps some more scattered development further inland this
afternoon. With pws still in the neighborhood of 2.0-2.2 inches
right along the coast, locally heavy rainfall will be possible
with these showers storms today, especially if they train over the
same areas. Isolated pockets of greater than 2-2.5 inches of
rainfall will be possible with some of these storms today, with
the greatest potential near and along the coast. In addition,
some of these showers storms may be capable of producing brief
funnel clouds or waterspouts over the coastal areas. Much like
yesterday, inland convection should die off after sunset with most
of the activity concentrated offshore heading into tonight.

A similar setup is forecast tomorrow with showers thunderstorms
initially over the waters and coastal zones early in the morning
before spreading inland during the afternoon. By tomorrow
afternoon, the coastal trough will have diminished and winds
will become moderate southerly in response to a deepening surface
low over the plains. At the same time, an area of upper-level
weakness that has been aiding in driving the convection over the
past couple of days will continue to push towards the northern
gulf with upper ridging trying to nose in from mexico. The net
result of all of this will be a down tick in convection over the
gulf tomorrow night followed by an eastward shift in the daytime
convection on Friday. Upper ridging will continue to build in
from the west this weekend, which should put an end to rain
chances for at least a few days. An upper level disturbance
rotating around the plains early next week may weaken the ridging
enough to squeeze out a couple showers or storms on Tuesday.

Otherwise, hot temperatures for the next couple of days will get
hotter (low to mid 90s) this weekend as the forecast dries out.

Heat indices are forecast in the 100-105 degree range this weekend
and into next week. 11

Marine
Mid level circulation helping to focus scattered to numerous showers
and thunderstorms over the coastal waters this morning. As the
coastal trough meanders around and in from the coast expect the
storms to continue develop and spread inland. During the afternoon
hours may see a lull over the coastal waters before it fires up
again tonight. Winds this morning 15 to 20 knots and will keep a
scec going through 7 am then let it come down only to come back up
in the eastern waters late this afternoon as gradient tightens back
up. Elevated tide levels will continue with the persistent coastal
troughing. Beach hazard statement extended through 7 pm but will
likely need extending through tonight with increase in winds. Rip
current stronger today and probably begin to see some overwash on 87
near high island during the high tide this afternoon with these same
conditions tonight and Thursday. For what it is worth the arw core
and tt-wrf both focus showers and thunderstorms over the coastal
waters this afternoon tonight with the potential for stronger winds.

Will need to keep an eye on future runs for some consistency and if
so may warrant bumping up winds 5-15 knots.

45

Aviation
Tough forecast today. Vlifr at uts this morning with bkn001 and
showers streaming into the the coastal areas. How far the showers
make it inland this morning is a tough call. Expecting as the
nocturnal elevated winds relax may see a break focusing showers
closer to the coast then jumping inland with a little heating. Gfs
soundings look to be too dry in the ll at 12z so have trended toward
nmm NAM hrrr solutions which show an increase in coverage around 15z
for sgr lvj hou lbx areas then very slowly expanding northward in
the afternoon and clearing near the coast. Overnight expect to see
shra redevelop over the waters and spread inland along the length
of the coast around 06-08z.

45

Preliminary point temps pops
College station (cll) 91 74 91 77 92 30 10 30 10 30
houston (iah) 87 75 89 78 90 50 30 60 20 40
galveston (gls) 83 79 87 82 88 70 50 70 30 40

Hgx watches warnings advisories
Tx... None.

Gm... Small craft should exercise caution from this afternoon through
Thursday morning for the following zones: coastal waters
from high island to freeport out 20 nm... Waters from high
island to freeport from 20 to 60 nm.

Discussion... 11
aviation marine... 45


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 0 mi51 min ESE 12 G 14 79°F 82°F1012.6 hPa
GRRT2 12 mi51 min ESE 11 G 16 76°F 81°F1012.4 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 13 mi51 min E 17 G 19 83°F1011.9 hPa
MGPT2 - 8770613 - Morgans Point, TX 14 mi51 min NE 8 G 9.9 76°F 83°F1012.7 hPa
GTOT2 14 mi51 min 79°F 83°F
LYBT2 21 mi51 min NE 7 G 8.9 74°F 83°F1013 hPa
RLOT2 - 8770971 - Rollover Pass, TX 22 mi51 min ESE 12 G 13 79°F 80°F1012.5 hPa
NCHT2 - 8770777 - Manchester, TX 25 mi51 min NNE 4.1 G 6 75°F 82°F1012 hPa
HIST2 29 mi51 min NNE 2.9 G 5.1 77°F 83°F1012.9 hPa
KXIH 30 mi46 min S 14 G 20 77°F 72°F
LUIT2 30 mi51 min E 8.9 G 12 76°F
42035 - GALVESTON 22NM East of Galveston, TX 32 mi91 min E 14 G 16 79°F 82°F4 ft1012 hPa (-1.0)74°F
42043 - GA-252 TABS B 34 mi141 min 5.8 G 9.7 72°F 83°F1011.8 hPa (-1.1)
FCGT2 - 8772447 - USCG Freeport, TX 42 mi51 min E 6 G 8.9 80°F 85°F1012.2 hPa
SRST2 - Sabine Pass, TX 49 mi81 min ENE 7 G 8.9 76°F 1013.3 hPa (-0.9)74°F

Wind History for Eagle Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galveston, Scholes Field, TX15 mi29 minSE 910.00 miOvercast77°F75°F96%1012.8 hPa
Houston / Ellington, TX16 mi31 minNNE 510.00 miMostly Cloudy77°F73°F89%1013.2 hPa
Houston, Houston Hobby Airport, TX22 mi28 minENE 610.00 miMostly Cloudy76°F72°F88%1013.1 hPa

Wind History from GLS (wind in knots)
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Last 24hrE5E8E10E9E11Calm4E8E11E12
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1 day agoNE11E8NE7NE11E9E11NE12E12E10E8E9E10E16
G23
S6S4N4S6SE11E8CalmE7E9E10E6
2 days agoNE7NE6NE8SE12NE3N9N9NE12E10E9E8E6E7E5E8E15
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Tide / Current Tables for Eagle Point, Galveston Bay, Texas
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Eagle Point
Click for Map
Wed -- 04:45 AM CDT     -0.17 feet Low Tide
Wed -- 06:22 AM CDT     Sunrise
Wed -- 11:14 AM CDT     Moonrise
Wed -- 02:40 PM CDT     0.89 feet High Tide
Wed -- 08:23 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.20-0.1-0.2-0.2-0.1-00.10.30.50.60.80.80.90.90.90.80.80.80.70.70.60.6

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Wed -- 01:36 AM CDT     -1.73 knots Max Ebb
Wed -- 05:56 AM CDT     0.00 knots Slack
Wed -- 06:22 AM CDT     Sunrise
Wed -- 09:23 AM CDT     1.66 knots Max Flood
Wed -- 11:14 AM CDT     Moonrise
Wed -- 03:20 PM CDT     -0.00 knots Slack
Wed -- 06:12 PM CDT     -0.59 knots Max Ebb
Wed -- 08:22 PM CDT     Sunset
Wed -- 08:31 PM CDT     -0.45 knots Min Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.6-1.7-1.7-1.6-1.2-0.700.81.41.61.61.41.10.80.50.1-0.2-0.5-0.6-0.5-0.5-0.5-0.5-0.7

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 (8,2,3,4)
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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.