Friday, June23, 2017 L-36.com


Marine Weather and Tides
Seabrook, TX

Version 3.4
What's New / NOTES
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 6:19AMSunset 8:25PM Friday June 23, 2017 12:09 PM CDT (17:09 UTC) Moonrise 4:59AMMoonset 7:03PM Illumination 0% Phase: New Moon; Moon at 29 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 Matagorda Bay-galveston Bay- 405 Am Cdt Fri Jun 23 2017
.small craft should exercise caution...
Today..South winds 15 to 20 knots decreasing to 10 to 15 knots in the afternoon. Bay waters choppy becoming slightly choppy in the afternoon.
Tonight..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms after midnight.
Saturday..Southeast winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Saturday night..East winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms in the evening, then a chance of showers and Thunderstorms after midnight.
Sunday..East winds 5 to 10 knots. Bay waters smooth. Showers and Thunderstorms likely.
Sunday night..East winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Monday..East winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms in the morning, then showers and Thunderstorms likely in the afternoon.
Monday night..East winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms in the evening, then a chance of showers and Thunderstorms after midnight.
Tuesday..East winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon. A chance of showers and Thunderstorms.
Tuesday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy. 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 405 Am Cdt Fri Jun 23 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Moderate southerly winds should slacken some later this morning, but 6-7 foot seas will likely stick around for most if not all of the day today and into tonight. For this reason, the small craft advisory was extended for the offshore waters through 3 pm this afternoon with a scec in place after that lasting into tonight. Winds and seas will continue to slowly diminish into the weekend, with periods of moderate onshore flow and elevated seas returning around midweek.

7 Day Forecast for Marine Location Near Seabrook, TX
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location: 29.61, -94.98     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 231526
afdhgx
area forecast discussion
national weather service houston galveston tx
1026 am cdt Fri jun 23 2017

Update
Southeast texas is already off to a hot start this morning with
10 am cdt heat index values in the mid to upper 90s west of
interstate 45. Visible satellite imagery shows cumulus cloud
streets streaming northeast across most of the region, with
slightly "cooler" conditions across the extreme eastern counties
where denser cloud cover exists. Aircraft soundings out of houston
reported 850 mb temperatures around 21 c, which should provide
for daytime highs climbing into the low to mid 90s. The
aforementioned cloud cover will play a big role in just how warm
the region is able to get today... And would not be surprised to
see some upper 90s for areas (especially the western counties)
where cloud cover is able to scour out. No changes are planned to
the ongoing heat advisory, with peak afternoon heat index values
in the 102-109 range this afternoon.

Morning soundings from corpus christi and fort worth show good
capping around 940-960 mb, which should do a good job suppressing
most convection that attempts to develop once convective
temperatures in the lower 90s are reached around midday. This
capping inversion is not quite as strong on the lake charles
sounding and as a result areas east of interstate 45 may see an
isolated shower (or possibly a thunderstorm) through early
evening. Main change to the forecast was to add an isolated shower
mention to the eastern waters where surface analysis noted an
axis of surface convergence as well as to areas around galveston
bay this afternoon based on trends in latest high resolution
guidance. Also updated hourly temperatures and dew points based on
observational trends.

Huffman

Prev discussion issued 620 am cdt Fri jun 23 2017
aviation...

MVFR CIGS should lift throughout the morning. An isolated shower
or storm may be possible this afternoon, but chances are far too
low to include in the taf. MVFR CIGS may return overnight tonight.

Otherwise, light to moderate southerly wind is expected through
the TAF period. 11
prev discussion... Issued 448 am cdt Fri jun 23 2017
discussion...

warming 850 700mb temps will likely inhibit much in the way of
precip today - especially for portions of the region west of
i-45. Continued southerly flow will persist and am not expecting
the current 75-79f dewpoints to mix out all that much. Warm temps
and high humidity will combine to produce some 107-109 degree
heat indices today... Generally along and west of a college
station-edna line. Went ahead and issued a heat advsy for that
area this afternoon. Expect 103-107 indices further east.

A weak cool front is forecast to sag into SE tx on Saturday. Pw's
pool to 2-2.3" ahead of the front and 850 700mb temps diminish
whereas capping shouldn't be much of a concern. Expect
showers thunderstorms to increase in areal coverage with daytime
heating. With a general weakness situated aloft and light
steering flow, storm motions appear to be less than 7kt so
locally heavy rain appears to be possible. A second concern is
a possible collision of the seabreeze with precip along the front
during the afternoon - which would enhance rain rates & storm
strength where it occurs. Unfortunately this many times is close
to the metro area. Just something we'll be watching...

elevated moisture levels, a diffuse front, and a mid upper level
weakness will linger into at least the early part of next week.

This should provide fairly good chances of shra tstms each day,
most likely diurnal in nature W precip offshore at night
transitioning inland during the day. Same general setup, minus the
surface boundary and maybe not as much resident moisture, will
probably persist for the remainder of the workweek. 47
marine...

moderate southerly winds should slacken some later this morning, but
6-7 foot seas will likely stick around for most if not all of the
day today and into tonight. For this reason, the small craft
advisory was extended for the offshore waters through 3 pm this
afternoon with a scec in place after that lasting into tonight.

Winds and seas will continue to slowly diminish into the weekend,
with periods of moderate onshore flow and elevated seas returning
around midweek.

Tides are still elevated tonight with some possible coastal flooding
in the usual areas like surfside, blue water highway, and highway 87
at 124 on bolivar. A coastal flood advisory has been issued for
these areas as high tide is approaching. Tide levels should come
fall below critical levels by mid morning. Astronomical high tides
will be above 2 feet the next few days. The good news is wind seas
should gradually diminish, but we'll continue to monitor conditions
for the usual spots prone to elevated water levels. 11

Preliminary point temps pops
College station (cll) 96 77 90 73 87 10 20 40 40 40
houston (iah) 93 77 90 75 87 10 20 70 40 70
galveston (gls) 89 81 89 81 87 10 20 40 40 70

Hgx watches warnings advisories
Tx... Heat advisory until 6 pm cdt this evening for the following
zones: austin... Brazos... Burleson... Colorado... Jackson...

washington... Wharton.

Gm... Small craft should exercise caution until 3 pm cdt this
afternoon for the following zones: galveston bay...

matagorda bay.

Small craft should exercise caution until 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.

Small craft advisory until 3 pm cdt this afternoon 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.

Small craft should exercise caution from 3 pm this afternoon to
10 pm cdt this evening 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... 14


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGPT2 - 8770613 - Morgans Point, TX 5 mi52 min S 8 G 12 87°F 83°F1010.7 hPa
EPTT2 - 8771013 - Eagle Point, TX 10 mi52 min SSW 13 G 17 84°F 81°F1011 hPa
LYBT2 12 mi52 min SSW 13 G 17 87°F 84°F1010.8 hPa
NCHT2 - 8770777 - Manchester, TX 17 mi52 min S 6 G 14 88°F 85°F1009.8 hPa
GRRT2 22 mi52 min SSE 9.9 G 13 84°F 82°F1011.1 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 22 mi58 min S 11 G 12 82°F1010.6 hPa
GTOT2 23 mi52 min 85°F 82°F
RLOT2 - 8770971 - Rollover Pass, TX 26 mi52 min S 8 G 12 86°F 80°F1011.4 hPa
HIST2 31 mi52 min S 7 G 12 86°F 81°F1011.6 hPa
KXIH 38 mi55 min SW 8 90°F 79°F
LUIT2 38 mi52 min S 9.9 G 14 85°F
42035 - GALVESTON 22NM East of Galveston, TX 40 mi80 min S 9.7 G 12 83°F 82°F5 ft1010.9 hPa (+1.2)80°F
42043 - GA-252 TABS B 44 mi130 min 12 G 16 78°F 82°F1010.3 hPa (+1.1)
FCGT2 - 8772447 - USCG Freeport, TX 49 mi52 min S 12 G 14 84°F 83°F1011.2 hPa

Wind History for Morgans Point, TX
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NE12
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX10 mi80 minS 1210.00 miMostly Cloudy90°F84°F84%1010.8 hPa
Houston, Pearland Regional Airport, TX15 mi77 minS 12 G 198.00 miA Few Clouds90°F72°F56%1010.7 hPa
Houston, Houston Hobby Airport, TX16 mi77 minSSW 12 G 1710.00 miPartly Cloudy90°F73°F59%1010.6 hPa
John Dunn Helistop, TX23 mi75 minS 810.00 miPartly Cloudy90°F71°F55%1009.5 hPa
Galveston, Scholes Field, TX24 mi78 minS 137.00 miFair86°F80°F83%1010.9 hPa

Wind History from EFD (wind in knots)
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Last 24hrSW9SW9W7SW5S11S11S11S10----S7--S6S6S6S6S6S6S5S5S13S11S12S10
1 day ago--N17
G23
N16N14N15N17--N15
G23
N15NW13NW15NW14--NW13NW12NW10NW10W9W6SW7SW9SW9--SW8
2 days agoN10--NE13NE10NE14NE13N13N9N9N8NE9N9N11N9N11
G18
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N14N14N13
G21
N11--N12

Tide / Current Tables for Barbours Cut, Morgans Point, Galveston Bay, Texas
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Barbours Cut
Click for Map
Fri -- 01:51 AM CDT     -0.44 feet Low Tide
Fri -- 05:59 AM CDT     Moonrise
Fri -- 06:20 AM CDT     Sunrise
Fri -- 11:35 AM CDT     1.62 feet High Tide
Fri -- 08:03 PM CDT     Moonset
Fri -- 08:23 PM CDT     Sunset
Fri -- 09:32 PM CDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.2-0.4-0.4-0.4-0.10.10.50.81.21.41.51.61.61.61.51.51.51.41.31.21.10.80.50.2

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Fri -- 01:12 AM CDT     0.00 knots Slack
Fri -- 04:42 AM CDT     2.75 knots Max Flood
Fri -- 05:59 AM CDT     Moonrise
Fri -- 06:20 AM CDT     Sunrise
Fri -- 11:14 AM CDT     -0.00 knots Slack
Fri -- 01:49 PM CDT     -0.49 knots Max Ebb
Fri -- 03:26 PM CDT     -0.40 knots Min Ebb
Fri -- 08:01 PM CDT     Moonset
Fri -- 08:22 PM CDT     Sunset
Fri -- 09:32 PM CDT     -2.61 knots Max Ebb
Fri -- 09:32 PM CDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.2-0.20.922.62.72.41.81.20.80.40.1-0.2-0.4-0.5-0.4-0.4-0.7-1.2-1.8-2.3-2.6-2.6-2.4

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 (13,3,4,5)
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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.