Sunday, March26, 2017 L-36.com


Marine Weather and Tides
Seabrook, 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 7:13AMSunset 7:36PM Sunday March 26, 2017 3:49 PM CDT (20:49 UTC) Moonrise 5:24AMMoonset 5:20PM Illumination 1% 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 Galveston Bay- 936 Am Cdt Sun Mar 26 2017
Rest of today..South winds 5 to 10 knots becoming southeast 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon.
Tonight..South winds 10 to 15 knots. Bay waters slightly choppy.
Monday..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms.
Monday night..South winds 5 to 10 knots. Bay waters smooth.
Tuesday..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday night..Southeast winds around 15 knots. Bay waters slightly choppy to choppy.
Wednesday..Southeast winds 15 to 20 knots. Bay waters choppy. A chance of showers and Thunderstorms.
Wednesday night..South winds 10 to 15 knots. Bay waters slightly choppy. Scattered showers and Thunderstorms.
Thursday..Southwest winds around 10 knots becoming west in the afternoon. Bay waters smooth to slightly choppy becoming slightly choppy in the afternoon. Scattered showers and Thunderstorms.
Thursday night..Northwest winds 5 to 10 knots. Bay waters smooth. Isolated showers and Thunderstorms.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 936 Am Cdt Sun Mar 26 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Onshore winds will gradually strengthen today. Strong southerly flow should develop on Wednesday as another storm system moves into the southern plains.

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 261509
afdhgx
area forecast discussion
national weather service houston/galveston tx
1009 am cdt Sun mar 26 2017

Update
Surface low pressure is continuing to trek across the panhandle of
texas this morning, and will continue to move east through the
afternoon hours. Pressure fields at 500mb show a ridging pattern
overhead, in front of the next upper level low pressure system
that is still off to the west the texas great plains. Models are
keeping the best chance for precipitation in the northern counties
of SE texas during the overnight hours between 06-12z Monday.

That being said, current forecast is on track. Made a few
adjustments to the high temperatures, based off latest
observations and satellite imagery. High temperatures will reach
into the mid 80s, late this afternoon. Still expecting breezy
conditions later in the day as the pressure gradient tightens.

Wind gusts specifically across the western half of the forecast
area will see the occasional gusts around 25 mph, and around 20mph
across the eastern half. Skies will be partly cloudy, with patchy
stratus clouds streaming across the forecast area. Cloud cover
should thicken slightly as we move into the evening hours, and as
our chance for precip increase specifically in the northern
zones as Monday rolls in.

Hathaway

Marine
Winds in the nearshore have dropped off but as trough over nm
translates out into the plains expecting gradient to tighten up and
winds to increase this afternoon. By late afternoon winds well
offshore should be 15-20 knots with 4-6 foot seas. Will put up a
scec starting mid afternoon through 4 am but it may need extending.

45

Aviation
The morning fog and low stratus dissipating and lifting with the
temperatures expected to soar into the mid 80s and gusty south
winds.VFR conditions expected by mid afternoon but they should be
relatively short lived as stratus deck redevelops this evening.

Bkn020-025 deck should form around 03z and spread northward
throughout the remainder of the night.

45
prev discussion... /issued 429 am cdt Sun mar 26 2017/
discussion...

areas of fog have developed and at times the fog has become
locally dense. A dense fog advisory may yet be required this
morning. Once the fog burns off later this morning, sunshine will
return to the region at least through the early afternoon but
clouds should return near the coast by mid afternoon. The
pressure gradient is weak this morning but really begins to
tighten by aftn. Breezy conds expected by afternoon with
occasional gusts above 25 mph possible. An upper level disturbance
will move across the southern plains tonight and early Monday. The
tail end of the disturbance could clip the northern portion of se
tx late tonight so will maintain the slight rain chances. Pw
values look meager but there will be some additional forcing with
a 90 kt jet streak. The disturbance will exit the region on Monday
but a weak extension from the disturbance lingers across the
east half of the CWA on Monday. Fcst soundings show a strong
capping inversion in place at 850 mb through 18z eroding between
21-00z. Can't rule out a few shra/iso tsra along the weakness
trailing the upper level disturbance.

An upper level low will move into new mexico on Tuesday with weak
upper level ridging amplifying over east texas. Fcst soundings
show very dry air above 850 mb and a capping inversion in the
850-700 mb layer. The upper low will move east into west texas
Tuesday night. Pw values begin to climb but a stubborn cap should
keep rain chances on the low side. The upper low will move across
the texas panhandle and into southern ks by Thu 00z. Pw values
surge to 1.75 inches over the north and 1.60 inches further south.

Fcst soundings show a semi saturated profile at kcll and not
quite as saturated toward kiah. CAPE values increase to between
1500-2000 with LI values near -8. Jet dynamics look impressive
with a well defined splitting jet and SE tx in a 95 kt lfq. Spc
has outlooked the areas north of i-10 for Wednesday. The system is
fairly progressive and will exit the region Wednesday evening.

Some timing differences between the ECMWF and GFS on Thursday as
the ECMWF looks a bit slower with more energy lagging on the
backside of the upper low. The GFS also drags a cold front through
the area on Thursday while the ECMWF does not. Not sure which is
right so used a model blend for temps thu/fri. Could be huge bust
in temps on Friday as the ECMWF is providing a high at kcll of 92
and the mex numbers support 78.

Another potent storm system will approach next weekend and
moisture levels start increasing late Saturday with a good chance
of rain next Sunday and Monday. Pw values progged to reach 1.90
inches so the area might receive some heavy rain. Still a long
ways off and models have not been the most consistent of late. 43

Preliminary point temps/pops
College station (cll) 86 67 86 67 85 / 10 20 10 10 10
houston (iah) 85 69 85 69 85 / 10 10 20 10 10
galveston (gls) 81 72 81 74 80 / 10 10 10 0 0

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

Gm... Small craft should exercise caution from 4 pm cdt this afternoon
through late tonight 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... 08
marine/aviation... 45


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGPT2 - 8770613 - Morgans Point, TX 5 mi49 min SE 12 G 17 76°F 74°F1012.4 hPa (-1.9)
EPTT2 - 8771013 - Eagle Point, TX 10 mi49 min SSE 17 G 21 75°F 76°F1012.3 hPa (-2.0)
LYBT2 12 mi49 min SE 15 G 20 76°F 73°F1011.2 hPa (-1.9)
NCHT2 - 8770777 - Manchester, TX 17 mi49 min SE 12 G 16 81°F 73°F1011.6 hPa (-2.2)
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 22 mi49 min SE 14 G 16 73°F
GRRT2 22 mi49 min SSE 14 G 18 74°F 77°F1012.3 hPa (-2.2)
GTOT2 23 mi49 min 75°F 73°F
HIST2 31 mi49 min SE 5.1 G 12 76°F 76°F1013.2 hPa (-2.0)
LUIT2 38 mi49 min SSE 12 G 16 76°F 75°F
KXIH 38 mi34 min S 9.9 G 17 79°F 70°F
42035 - GALVESTON 22NM East of Galveston, TX 40 mi59 min SE 16 G 18 73°F 73°F3 ft1012.2 hPa (-2.8)72°F
FCGT2 - 8772447 - USCG Freeport, TX 49 mi49 min SE 14 G 16 74°F 71°F1011.9 hPa (-2.6)

Wind History for Morgans Point, TX
(wind in knots)    EDIT      (on/off)   Help
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Last
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S16
G25
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SE8
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G22

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX10 mi2 hrsSSE 1010.00 miPartly Cloudy81°F64°F58%1012.9 hPa
Houston, Pearland Regional Airport, TX15 mi56 minSSE 14 G 248.00 miA Few Clouds81°F64°F57%1012.2 hPa
Houston, Houston Hobby Airport, TX16 mi56 minS 15 G 2210.00 miPartly Cloudy82°F64°F56%1011.9 hPa
John Dunn Helistop, TX23 mi74 minSE 15 G 2210.00 miFair82°F60°F48%1010.2 hPa
Galveston, Scholes Field, TX24 mi57 minSE 133.00 miOvercast with Haze80°F72°F76%1012.6 hPa

Wind History from EFD (wind in knots)
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Last 24hrW6W9W4CalmSW4SE4CalmS4S4S5CalmCalm--CalmCalmCalmCalmCalmS9--S14S14SE10SE13
1 day agoS21
G30
S15
G25
S13
G20
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G23
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G23
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G24
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G26
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SW8S10S7S9S9S10S8S9SW7SW9NW7NW10NW6--W6W6
2 days agoSE12SE15S14
G20
SE16SE12SE9SE10SE7--SE11SE11
G17
SE8SE12
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G18
SE10SE10SE11SE8SE14
G19
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G25
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G23
S18

Tide / Current Tables for Barbours Cut, Morgans Point, Galveston Bay, Texas
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Barbours Cut
Click for Map
Sun -- 02:48 AM CDT     0.89 feet Low Tide
Sun -- 06:24 AM CDT     Moonrise
Sun -- 06:54 AM CDT     1.05 feet High Tide
Sun -- 07:16 AM CDT     Sunrise
Sun -- 02:15 PM CDT     0.18 feet Low Tide
Sun -- 06:20 PM CDT     Moonset
Sun -- 07:35 PM CDT     Sunset
Sun -- 09:29 PM CDT     1.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.110.90.90.911110.90.80.60.40.20.20.20.30.50.70.91.11.11.11.1

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Sun -- 12:01 AM CDT     -0.55 knots Max Ebb
Sun -- 02:42 AM CDT     0.00 knots Slack
Sun -- 03:43 AM CDT     0.13 knots Max Flood
Sun -- 04:45 AM CDT     -0.00 knots Slack
Sun -- 06:23 AM CDT     Moonrise
Sun -- 07:15 AM CDT     Sunrise
Sun -- 09:51 AM CDT     -1.34 knots Max Ebb
Sun -- 01:42 PM CDT     0.00 knots Slack
Sun -- 04:34 PM CDT     1.33 knots Max Flood
Sun -- 06:19 PM CDT     Moonset
Sun -- 07:34 PM CDT     Sunset
Sun -- 08:28 PM CDT     -0.00 knots Slack
Sun -- 11:50 PM CDT     -0.68 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-0.5-0.20.10.1-0.1-0.4-0.8-1.1-1.3-1.3-1.2-1-0.50.20.91.31.310.60.2-0.2-0.4-0.6

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 (16,3,4,5)
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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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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.