Wednesday, March29, 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 7:10AMSunset 7:38PM Wednesday March 29, 2017 10:01 AM CDT (15:01 UTC) Moonrise 7:29AMMoonset 8:33PM Illumination 5% Phase: Waxing Crescent; Moon at 2 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- 341 Am Cdt Wed Mar 29 2017
.small craft advisory in effect until 10 am cdt this morning...
.small craft should exercise caution...
Today..South winds 15 to 25 knots. Bay waters choppy. Showers and Thunderstorms. Some Thunderstorms may be severe.
Tonight..South winds 10 to 15 knots becoming southwest after midnight. Bay waters slightly choppy. A chance of showers and Thunderstorms.
Thursday..Northwest winds 15 to 20 knots decreasing to 10 to 15 knots in the afternoon. Bay waters choppy becoming slightly choppy in the afternoon.
Thursday night..Southwest winds 5 to 10 knots becoming south after midnight. Bay waters smooth.
Friday..South winds 10 to 15 knots. Bay waters slightly choppy.
Friday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Saturday..Southeast winds 10 to 15 knots increasing to 15 to 20 knots in the afternoon. Bay waters slightly choppy becoming choppy in the afternoon.
Saturday night..Southeast winds around 15 knots. Bay waters slightly choppy to choppy. A chance of showers and Thunderstorms.
Sunday..Southeast winds around 15 knots becoming south in the afternoon. Bay waters slightly choppy to choppy becoming choppy in the afternoon. Showers and Thunderstorms likely.
Sunday night..Southwest 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 341 Am Cdt Wed Mar 29 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Strong southerly winds and rough seas should continue this morning and gradually decrease this afternoon. Seas will be slow to decrease due to the long southerly fetch. Conditions will improve further Thursday as a pacific cold front pushes off the coast. Moderate offshore winds are expected Thursday into Friday but southerly winds will be redeveloping over the weekend.

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 291144
afdhgx
area forecast discussion
national weather service houston/galveston tx
644 am cdt Wed mar 29 2017

Aviation /12z tafs/
radar shows one band of storms that moved across kcll to kuts
this morning with another band of storms approaching from the
w/sw. This line on its current track and speed should reach
ksgr/khou/kiah around 13-15z time frame. All tafs are accounting
for similar timing for klbx/kgls/kcxo/kuts/kcll. There is still
capping the line is fighting since the southern extend of the
squall line is struggling to hold together. This will be the main
concern for the next 6 hours. Difficult to know if the storms will
hold together or weaken into just showers as they reach houston
terminals. Tafs reflect storms reaching houston but will need to
watch trends closely. Trends with the hrrr show the line weakening
through the morning hours although the timing from the hrrr is to
slow. Hrrr also indicates the possibility of storms re-developing
this afternoon/evening. Quite possible if there is enough
recovery and the atmosphere is not overworked by previous
convection. Tafs reflect this possibility with vcts but this could
very well be removed with future TAF updates depending on how the
first round of convection evolves. Overnight NAM suggests MVFR
ceilings with remaining low level moisture while GFS is drier.

Tafs went with trends of drier ahead of pacific front that pushes
through the area 06-10z tomorrow morning.VFR expected for
Thursday.

Overpeck

Prev discussion /issued 332 am cdt Wed mar 29 2017/
discussion...

an upper low pressure trough will move across the state today and
the associated cold front will push across SE texas tonight. A
line of thunderstorms was moving east of the interstate 35
corridor at 3:00 am. The latest models have been a bit slow with
the advent of the storms; although, the latest runs of the hrrr
are fairly close. All the models slow the advance of the line of
storms as they enter into the western counties of the forecast
area. If the storms continue their current trends, expect the line
to reach college station and madisonville by 4:00 am. If it does
not slow down, the line should then reach huntsville, bellville,
and possibly columbus between 5:00 and 6:00 am. All the models
then show the line slowing and probably not reaching metro
houston until sometime between 6:00 am and 9:00 am.

Still looking at a decent environment for at least isolated severe
storms. Main threats are damaging winds and isolated tornadoes
given 0-3 km helicity values are between 300 and 400 ahead of the
line. Other threats include large hail and locally heavy rainfall.

Expect the initial line of storms to move out of the area during
the midday to early afternoon period. The hrrr shows the potential
for additional development later in the afternoon. The actual cold
front will move across the forecast area tonight.

After a cooler day on Thursday, an upper level ridge moving
overhead will set things up for a rather warm Friday. Highs on
Friday will likely reach into the mid 80s.

The progressive flow aloft will bring the next system across se
texas over the weekend and early next week. The best chances for
showers and thunderstorms will be on Sunday and Sunday night.

Isolated to strong to severe storms and locally heavy rainfall
again look to be possible.

40
marine...

southeast winds of 20 to 28 knots will continue across the upper
texas coast this morning. Seas have become rough with significant
wave heights reaching 6-7ft nearshore and 8-9ft off shore based on
noaa buoys. Winds should decrease later today but due to the long
fetch of southeast winds, seas will remain rough. Small craft
advisory has been extended for the offshore waters until this
evening when seas should drop below 7 feet. A pacific front will
push off the coast Thursday morning allowing for winds to shift
to the northwest. Winds quickly return to the south on Friday and
increase through the weekend. Caution or advisories may be needed
over the weekend. Another pacific front pushes through early
Monday which will shift winds again.

Overpeck

Preliminary point temps/pops
College station (cll) 82 56 77 56 86 / 80 20 10 0 0
houston (iah) 81 61 78 57 86 / 80 40 10 0 0
galveston (gls) 77 66 74 66 78 / 70 50 10 0 10

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

Gm... Small craft advisory until 10 am cdt this morning for the
following zones: galveston bay... Matagorda bay.

Small craft should exercise caution from 10 am cdt this morning
through this evening for the following zones: galveston
bay... Matagorda bay.

Small craft advisory until 7 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... 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... 40
aviation/marine... 39


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 6 mi44 min ESE 16 G 18
MGPT2 - 8770613 - Morgans Point, TX 9 mi44 min E 14 G 17 74°F 76°F1009.8 hPa
LYBT2 15 mi44 min ESE 11 G 16 74°F 75°F1009 hPa
GRRT2 18 mi44 min SE 9.9 G 13 74°F 74°F1009.9 hPa
NCHT2 - 8770777 - Manchester, TX 19 mi44 min S 2.9 G 12 76°F 74°F1009.4 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 20 mi44 min E 16 G 18
GTOT2 20 mi44 min 74°F 74°F
RLOT2 - 8770971 - Rollover Pass, TX 26 mi44 min ESE 14 G 16 74°F 75°F1010.5 hPa
HIST2 32 mi44 min ESE 8.9 G 12
LUIT2 33 mi44 min ENE 12 G 15 73°F
KXIH 36 mi27 min SSE 15 75°F 70°F
42035 - GALVESTON 22NM East of Galveston, TX 38 mi72 min ESE 7.8 G 12 73°F 71°F6 ft1010.5 hPa (+2.8)71°F
FCGT2 - 8772447 - USCG Freeport, TX 45 mi44 min E 8.9 G 11 75°F 74°F1009.5 hPa

Wind History for Eagle Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX10 mi72 minE 910.00 miMostly Cloudy73°F68°F83%1009.8 hPa
Houston, Pearland Regional Airport, TX13 mi69 minESE 88.00 miOvercast77°F68°F74%1009.7 hPa
Houston, Houston Hobby Airport, TX16 mi69 minESE 910.00 miMostly Cloudy75°F68°F79%1009.7 hPa
Galveston, Scholes Field, TX21 mi70 minE 109.00 miPartly Cloudy76°F71°F85%1010.3 hPa
John Dunn Helistop, TX24 mi67 minESE 13 G 185.00 miA Few Clouds73°F66°F78%1008.1 hPa

Wind History from EFD (wind in knots)
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Last 24hrSE10SE10SE11SE14SE12E13SE17SE17
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SE11CalmE3E7E9
1 day agoS8S11S11S12S12S14S14S13S11SE13SE8SE7SE4SE4SE4SE3SE4SE5SE3SE6SE6SE4E6SE8
2 days agoS9--S14S14SE10SE13S15S13S11S11S10SE9S9S7----S5----SE5--SE5S6S6

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Wed -- 05:46 AM CDT     -0.03 feet Low Tide
Wed -- 07:13 AM CDT     Sunrise
Wed -- 08:28 AM CDT     Moonrise
Wed -- 12:23 PM CDT     0.73 feet High Tide
Wed -- 06:36 PM CDT     0.19 feet Low Tide
Wed -- 07:37 PM CDT     Sunset
Wed -- 09:33 PM CDT     Moonset
Wed -- 11:58 PM CDT     0.58 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.50.40.20.1-0-000.10.30.50.60.70.70.60.50.40.30.20.20.20.30.40.5

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Wed -- 03:15 AM CDT     0.00 knots Slack
Wed -- 06:11 AM CDT     1.63 knots Max Flood
Wed -- 07:11 AM CDT     Sunrise
Wed -- 08:27 AM CDT     Moonrise
Wed -- 09:36 AM CDT     -0.00 knots Slack
Wed -- 01:10 PM CDT     -1.06 knots Max Ebb
Wed -- 04:30 PM CDT     0.00 knots Slack
Wed -- 06:16 PM CDT     0.54 knots Max Flood
Wed -- 07:35 PM CDT     Sunset
Wed -- 08:04 PM CDT     -0.00 knots Slack
Wed -- 09:32 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.2-1.1-0.8-0.20.61.31.61.510.4-0.2-0.7-0.9-1.1-1-0.7-0.30.20.50.40-0.5-1-1.4

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 (11,2,3,4)
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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.