Saturday, April29, 2017 L-36.com


Marine Weather and Tides
Clear Lake Shores, 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 6:37AMSunset 7:57PM Saturday April 29, 2017 12:31 AM CDT (05:31 UTC) Moonrise 8:36AMMoonset 10:38PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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- 840 Pm Cdt Fri Apr 28 2017
.small craft advisory in effect through Sunday afternoon...
Tonight..Southeast winds increasing to 20 to 25 knots. Gusts to near gale force possible toward morning. Bay waters becoming rough. Areas of fog. A slight chance of showers after midnight.
Saturday..Southeast winds near 25 knots. Bay waters rough. Patchy fog early in the morning. A slight chance of showers in the morning. A chance of showers and Thunderstorms in the afternoon.
Saturday night..South winds 15 to 20 knots. Bay waters choppy. A chance of showers and Thunderstorms in the evening, then showers and Thunderstorms after midnight.
Sunday..Northwest winds 15 to 20 knots decreasing to 10 to 15 knots in the afternoon. Bay waters choppy becoming slightly choppy in the afternoon. A chance of showers and Thunderstorms in the morning.
Sunday night..Northwest winds 10 to 15 knots becoming north 5 to 10 knots after midnight. Bay waters slightly choppy becoming smooth after midnight.
Monday..Southwest winds 5 to 10 knots becoming south in the afternoon. Bay waters smooth.
Monday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday..Southeast winds 10 to 15 knots decreasing to 5 to 10 knots in the afternoon. Bay waters slightly choppy becoming smooth in the afternoon.
Tuesday night..South winds 5 to 10 knots. Bay waters smooth. A chance of showers. A chance of Thunderstorms after midnight.
Wednesday..West winds around 5 knots becoming northwest in the afternoon. Bay waters smooth. A chance of showers and Thunderstorms.
Wednesday night..Northwest winds 5 to 10 knots increasing to 15 to 20 knots after midnight. Bay waters smooth becoming choppy after midnight. 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 840 Pm Cdt Fri Apr 28 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Onshore winds will continue to strengthen overnight. Some gusts to near gale force are possible...mainly after 2 am into the late morning hours Saturday. In addition to rapidly building seas there will also be areas of sea fog with visibilities generally ranging from 1 to 4 miles. Strong onshore winds and elevated seas will persist until the next cold front pushes off the coast early Sunday morning.

7 Day Forecast for Marine Location Near Clear Lake Shores, TX
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location: 29.55, -95     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 290429
afdhgx
area forecast discussion
national weather service houston/galveston tx
1129 pm cdt Fri apr 28 2017
aviation...

MVFR ceilings and haze/fog will likely persist for the next 24
hours w/ moisture being trapped under a cap. The low level jet
will strengthen to 40-50kt by sunrise and anticipate some wind
gusts to start showing up in the obs as this occurs. Until then, i
did throw the mention of low level wind shear into some of the
tafs. Otherwise, continued breezy on Saturday with some scattered
waa & speed convergence shra. Organized TSTM chances shouldn't
enter the picture until after 3z Sunday (10pm sat) as a line of
convection approaches from the NW in association with a cold
front. 47

Prev discussion /issued 939 pm cdt Fri apr 28 2017/
made some fcst updates this evening (which have already been
sent). Little change to temps, winds, dewpoints, etc other than to
match existing obs. Doubt we'll see much more of a temp drop as
winds remain up overnight. Low level jet increases to 40-50 kt by
morning.

We did add some fog/haze to the grids. Despite water temps
continuing to run above normal off the coast, even crazier high
77-79 degree dewpoints are advecting over it and we now have 1-2nm
visibilities in sea fog offshore...

winds/seas should increase overnight which will pile additional
water along the upper tx coast. They'll likely peak out during
the morning hours, unfortunately corresponding around high tide
times. Observed levels in the 3.8-4.2ft are a possibility which
would be enough to produce some coastal flooding. So... Upgraded
the watch to an coastal flood advisory. (it too is already out)
though they're not quite there yet, have upgraded the caution
flags in the bays to a small craft advisory for the remainder of
tonight and Saturday as wind speeds increase. With 40-50kt winds
at 925mb around sunrise... Wouldn't doubt if we see some gusts to
near gale force around that time.

Will let the next shift evaluate the need for a wind advisory at
the coast. Don't want to handcuff them with one just yet. 47

Preliminary point temps/pops
College station (cll) 77 88 58 73 49 / 20 40 80 10 10
houston (iah) 78 86 62 76 52 / 20 40 80 20 10
galveston (gls) 78 83 66 77 64 / 20 30 80 40 10

Hgx watches/warnings/advisories
Tx... Coastal flood advisory from 4 am to noon cdt Saturday for the
following zones: brazoria... Chambers... Galveston...

matagorda.

Gm... Small craft advisory until 2 pm cdt Sunday 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... 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... 99


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 6 mi43 min SSE 17 G 21 78°F 77°F1006.6 hPa
MGPT2 - 8770613 - Morgans Point, TX 9 mi43 min SE 11 G 16 78°F 76°F1006.6 hPa
LYBT2 15 mi43 min SE 13 G 18 78°F 77°F1005.7 hPa
GRRT2 18 mi43 min SSE 11 G 16 77°F 78°F1006.5 hPa
NCHT2 - 8770777 - Manchester, TX 19 mi43 min SSE 8 G 14 80°F 77°F1006.3 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 20 mi49 min SE 17 G 20 78°F1006.6 hPa
GTOT2 20 mi43 min 78°F 77°F
RLOT2 - 8770971 - Rollover Pass, TX 26 mi43 min SE 15 G 18 77°F 77°F1007.4 hPa
HIST2 32 mi49 min SE 4.1 G 8 78°F 77°F1008 hPa
LUIT2 33 mi43 min SE 13 G 17 78°F
KXIH 36 mi36 min S 22 77°F 75°F
42035 - GALVESTON 22NM East of Galveston, TX 38 mi41 min SE 18 G 19 77°F 76°F5 ft1007 hPa (+1.5)77°F
FCGT2 - 8772447 - USCG Freeport, TX 45 mi43 min SE 15 G 18 78°F 78°F1006.4 hPa

Wind History for Eagle Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX10 mi41 minSE 127.00 miOvercast81°F73°F79%1007.1 hPa
Houston, Pearland Regional Airport, TX13 mi38 minSSE 15 G 195.00 miOvercast with Haze81°F75°F82%1006.6 hPa
Houston, Houston Hobby Airport, TX16 mi38 minSSE 128.00 miOvercast79°F75°F88%1006.4 hPa
Galveston, Scholes Field, TX21 mi39 minSE 145.00 miFog/Mist79°F77°F94%1006.9 hPa
John Dunn Helistop, TX24 mi56 minSSE 18 G 223.00 miOvercast and Breezy79°F73°F84%1004.7 hPa

Wind History from EFD (wind in knots)
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Last 24hrSE5SE7SE6SE7SE8SE9S7SE11SE12SE17
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SE12SE12SE14SE13SE10SE12SE13SE13SE12SE12
1 day agoN9N7N9N6----NE4NE7NE8NE8E8E9E6E9SE8E8E5SE8E7E5SE9SE9SE6SE8
2 days agoS10SE10SE11SE12S11
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--SE14SE12S13S14S10S9S8S11--SW6SW6S6----N11N10N9

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Sat -- 06:39 AM CDT     Sunrise
Sat -- 07:01 AM CDT     -0.35 feet Low Tide
Sat -- 09:37 AM CDT     Moonrise
Sat -- 03:02 PM CDT     0.90 feet High Tide
Sat -- 07:55 PM CDT     Sunset
Sat -- 09:05 PM CDT     0.66 feet Low Tide
Sat -- 11:38 PM CDT     Moonset
Sat -- 11:54 PM CDT     0.70 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.60.50.20-0.2-0.3-0.3-0.3-0.200.30.50.70.90.90.90.80.80.70.70.70.70.7

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Sat -- 04:16 AM CDT     0.00 knots Slack
Sat -- 06:38 AM CDT     Sunrise
Sat -- 07:45 AM CDT     2.55 knots Max Flood
Sat -- 09:36 AM CDT     Moonrise
Sat -- 01:43 PM CDT     -0.00 knots Slack
Sat -- 04:50 PM CDT     -0.57 knots Max Ebb
Sat -- 06:40 PM CDT     -0.49 knots Min Ebb
Sat -- 07:54 PM CDT     Sunset
Sat -- 11:37 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.2-2.1-1.7-1.1-0.30.81.82.42.52.21.71.10.60.3-0.1-0.4-0.5-0.6-0.5-0.5-0.7-1-1.4-1.8

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 (1,6,7,8)
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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.