Wednesday, December13, 2017 L-36.com


Marine Weather and Tides
Clear Lake Shores, 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 7:05AMSunset 5:24PM Wednesday December 13, 2017 4:57 AM CST (10:57 UTC) Moonrise 2:54AMMoonset 2:42PM Illumination 25% Phase: Waning Crescent; Moon at 25 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- 338 Am Cst Wed Dec 13 2017
Today..Northeast winds around 5 knots becoming southwest 5 to 10 knots in the afternoon. Bay waters smooth.
Tonight..Southwest winds 5 to 10 knots. Bay waters smooth.
Thursday..Northwest winds around 5 knots becoming 5 to 10 knots in the afternoon. Bay waters smooth.
Thursday night..North winds 10 to 15 knots increasing to 15 to 20 knots after midnight. Bay waters slightly choppy becoming choppy after midnight. A slight chance of showers.
Friday..North winds 15 to 20 knots decreasing to 10 to 15 knots in the afternoon. Bay waters choppy becoming slightly choppy in the afternoon. A slight chance of showers.
Friday night..North winds 5 to 10 knots. Bay waters smooth.
Saturday..Northeast winds 5 to 10 knots becoming east 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon. A chance of showers and Thunderstorms.
Saturday night..East winds 10 to 15 knots becoming southwest after midnight. Bay waters slightly choppy. A chance of showers and Thunderstorms.
Sunday..West winds 5 to 10 knots. Bay waters smooth. A slight chance of showers.
Sunday night..Northwest winds 5 to 10 knots becoming north after midnight. Bay waters smooth becoming smooth to slightly choppy after midnight.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 338 Am Cst Wed Dec 13 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Winds will continue to diminish today as high pressure settles over the area. West and southwest winds should develop in advance of a second front that is expected to arrive late Thursday. Look for some rain to develop behind the front along with an increase of northerly winds. Onshore flow resume by early Saturday and rapidly increase as pressures fall across the plains. Seas will build, chances of fog, showers and storms will increase ahead of an upper level disturbance that will push through the region Saturday night. Precipitation will come to an end early Sunday and a weak front will move into the waters.

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 131014
afdhgx
area forecast discussion
national weather service houston galveston tx
414 am cst Wed dec 13 2017

Discussion
Surface high pressure is centered just to our west early this morning
and is bringing light calm winds to our entire area. After a cold
start to the morning with some high clouds streaming across the area
from the west, look for temperatures to warm into the 60s and winds
to come back around to the south and southwest this afternoon as the
surface high moves off to the east. Tonight will be not as cold as
we await for the arrival passage of our next cold front during the
day tomorrow. There will be no rain with the front, but some rain
might develop behind the boundary late Thursday through Friday with
the lowest chances near the coast (dry well inland) and the higher
chances offshore. Cooler temperatures can be expected behind the
front as high pressure builds into the area from the northwest. Eyes
then turn toward our southwest and west over the weekend as a storm
system organizes and moves across the area. Models differ on the
timing strength of this system with some solutions keeping the best
lift dynamics near and off the coast Saturday through Saturday night
while other solutions bring some impressively strong lift dynamics
across parts of our area Saturday night through Sunday morning (see
spc's day 4-8 convective outlook). Went ahead and raised weekend
rain chances a little bit more with this morning's forecast package,
and we'll probably end up needing to carry much higher pops. At
this time, it looks like the first half of next week will be mostly
on the dry side with near normal temperatures. Some models are
showing a arctic cold wintry mix moving into the state over the
holiday weekend. Model changes are likely, and we'll be watching
to see how everything evolves. 42

Marine
Pressure gradient weakens today and expect a continued decline in
winds seas through thurs. A cold from twill push off the coast thurs
evening and northerly winds will gradually increase to around 25kt
after midnight into Friday morning. Small craft advisories will be
required. Look for areas of ran to develop behind the front as well.

Unsettled wx continues in the waters into the weekend. A quick,
strengthening onshore flow is expected early sat. Elevated winds,
seas and increasing shower storm coverage is expected in advance of
an approaching upper disturbance. (can't rule out some sea fog in
advance either). This disturbance should trek off to the east early
Sunday taking most of the precip with it and allowing a weak
training frontal boundary to make its way into the waters. 47

Aviation
Vfr for the next 30+ hours. Just some cirrus streaming overhead. 47

Fire weather
Dry conditions will persist once again today with rh's bottoming out
between 25-30% this afternoon. Winds speeds will be 5-15mph, so red
flag warnings are not anticipated. 47

Preliminary point temps pops
College station (cll) 65 41 63 37 58 0 0 10 10 0
houston (iah) 63 44 65 41 57 0 10 10 10 10
galveston (gls) 60 53 67 47 57 0 10 10 20 20

Hgx watches warnings advisories
Tx... None.

Gm... None.

42 47


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 6 mi40 min NNW 4.1 G 5.1 44°F 55°F1021.8 hPa
MGPT2 - 8770613 - Morgans Point, TX 9 mi40 min NNW 1.9 G 2.9 47°F 57°F1021.8 hPa
GRRT2 18 mi40 min 45°F 53°F1021.9 hPa
NCHT2 - 8770777 - Manchester, TX 19 mi40 min W 1 G 1.9 43°F 59°F1021.2 hPa
GTOT2 20 mi40 min NNE 2.9 G 2.9 48°F 59°F1020.8 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 20 mi46 min N 7 G 8.9 57°F1021.1 hPa
RLOT2 - 8770971 - Rollover Pass, TX 26 mi40 min NNE 6 G 7 46°F 49°F1021.6 hPa
HIST2 32 mi46 min N 4.1 G 5.1 40°F 53°F1021.8 hPa
LUIT2 33 mi58 min 58°F
KXIH 36 mi23 min 54°F 32°F
42035 - GALVESTON 22NM East of Galveston, TX 38 mi68 min NNE 9.7 G 12 55°F 60°F1 ft1021.7 hPa (-1.3)34°F
FCGT2 - 8772447 - USCG Freeport, TX 45 mi40 min NW 2.9 G 4.1 45°F 62°F1022.4 hPa

Wind History for Eagle Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston, Pearland Regional Airport, TX13 mi65 minN 010.00 miFair34°F32°F92%1022.2 hPa
Houston, Houston Hobby Airport, TX16 mi65 minN 010.00 miFair35°F33°F93%1022.3 hPa
Galveston, Scholes Field, TX21 mi66 minNNW 310.00 miFair48°F41°F77%1022.1 hPa
John Dunn Helistop, TX24 mi63 minN 010.00 miFair46°F24°F43%1021.3 hPa

Wind History from EFD (wind in knots)
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Last 24hrSW4SW4W7NW5NW6N6N7N10--N12NW12NW9N10N9NW10NW10N5NW5N5--W3CalmCalmW1
1 day agoCalmSW3--Calm--SW4SW3SW4--W3SW4W3W4SW5W4SW9SW4--SW5S7SW6SW5SW4SW5
2 days agoNW4--Calm--CalmCalmCalmCalmCalmCalmCalmW4CalmCalmNW5W5W5CalmW4SW3S3S3S5SW3

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Wed -- 01:03 AM CST     0.21 feet Low Tide
Wed -- 02:54 AM CST     Moonrise
Wed -- 06:07 AM CST     0.50 feet High Tide
Wed -- 07:06 AM CST     Sunrise
Wed -- 01:45 PM CST     -0.18 feet Low Tide
Wed -- 02:42 PM CST     Moonset
Wed -- 05:22 PM CST     Sunset
Wed -- 09:06 PM CST     0.47 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.20.20.30.40.50.50.50.40.30.20-0.1-0.2-0.2-0.1-00.10.30.40.50.50.50.4

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Wed -- 12:22 AM CST     0.46 knots Max Flood
Wed -- 02:21 AM CST     -0.00 knots Slack
Wed -- 02:52 AM CST     Moonrise
Wed -- 07:04 AM CST     Sunrise
Wed -- 07:18 AM CST     -1.60 knots Max Ebb
Wed -- 11:05 AM CST     0.00 knots Slack
Wed -- 02:14 PM CST     1.35 knots Max Flood
Wed -- 02:41 PM CST     Moonset
Wed -- 05:22 PM CST     Sunset
Wed -- 07:33 PM CST     -0.00 knots Slack
Wed -- 09:34 PM CST     -0.31 knots Max Ebb
Wed -- 11:31 PM CST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.40.1-0.3-0.8-1.2-1.5-1.6-1.6-1.3-0.8-0.10.61.11.31.310.70.40.1-0.1-0.3-0.3-0.1

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 (5,6,7,8)
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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.