Monday, April23, 2018 L-36.com


Marine Weather and Tides
Clear Lake Shores, TX

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:43AMSunset 7:53PM Monday April 23, 2018 4:37 AM CDT (09:37 UTC) Moonrise 12:44PMMoonset 1:40AM Illumination 56% Phase: First Quarter Moon; Moon at 8 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- 1029 Pm Cdt Sun Apr 22 2018
Rest of tonight..Northwest winds 5 to 10 knots. Bay waters smooth.
Monday..Northwest winds 5 to 10 knots. Bay waters smooth.
Monday night..Northwest winds 5 to 10 knots. Bay waters smooth.
Tuesday..Northwest winds around 5 knots becoming northeast in the afternoon. Bay waters smooth.
Tuesday night..South winds 5 to 10 knots becoming west after midnight. Bay waters smooth.
Wednesday..East winds around 5 knots becoming south in the afternoon. Bay waters smooth.
Wednesday night..Southwest winds around 10 knots becoming northwest after midnight. Bay waters smooth to slightly choppy. A slight chance of showers and isolated Thunderstorms.
Thursday..North winds 5 to 10 knots becoming northeast in the afternoon. Bay waters smooth.
Thursday night..Northeast winds around 5 knots becoming north after midnight. Bay waters smooth.
Friday..Northeast winds 5 to 10 knots becoming east in the afternoon. Bay waters smooth. A slight chance of showers and Thunderstorms.
Friday night..North winds 5 to 10 knots. Bay waters smooth.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 1029 Pm Cdt Sun Apr 22 2018
Synopsis for high island to matagorda ship channel out 60 nm.. Offshore winds will diminish this evening and remain light through Tuesday. A brief period of onshore winds will return Tuesday night until switching back to offshore Wednesday night with another weak front.

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 230859
afdhgx
area forecast discussion
national weather service houston galveston tx
359 am cdt Mon apr 23 2018

Near term [through today]
Temperatures this morning are in the 50s with a few rural areas
down in the 40s. Surface analysis has low pressure over tennessee
with weak high pressure over the plains down to texas. Upper level
analysis shows a psuedo-split flow pattern with one branch of the
jet stream coming across mexico, texas and the gulf coast. The
other branch of the jet has a trough over the inter-mountain west
and then across southern canada with a deeper trough over the new
england coast. Stuck between the two jets is weak flow due to a
weak ridge. All this means for weather today is a beautiful day as
temperatures should reach the mid upper 70s for high temperatures
and humidity levels will be low.

Short term [tonight through Wednesday night]
After another great day on Tuesday with high temperatures
reaching the 80s, a cold front is expected to push through
Wednesday into Wednesday night. The trough now over the inter-
mountain west slices through the weak ridging and drops towards
the ozarks by 00z Thursday. Wednesday night this potent short wave
trough pushes towards the mississippi river valley with the
trough axis reaching across SE texas by 12z Thursday. The
combination of several lifting mechanisms will support showers and
thunderstorms mainly overnight. The nam ECMWF are more aggressive
with precipitation amounts than the gfs, but I think the GFS is
not quite handling the magnitude of lift with this system. First
there is good lift from pva, the right entrance region of a jet
will be over the area, and there will be strong frontogenesis in
the 850mb-700mb layer. Most of this lift is behind the surface
front but there still should be plenty of moisture to work with to
produce precipitation. Model soundings from the NAM also indicate
6.5c to 7c lapse rates in the 3-6km layer and lifting a 800-750mb
layer parcel does yield small amounts of MUCAPE of 200-400j kg.

So while most of the precipitation should be from showers, data
also supports elevated convection which could produce some higher
rainfall amounts. As for rainfall amounts, think 0.25 to 0.5
inches looks reasonable since storms will be moving quickly
through the area. Trough axis should swing through 12z-18z
Thursday so have conditions improving Thursday morning.

Long term [Thursday through Monday]
Thursday and Friday will be seasonable with temperatures near
normal for the end of april. Upper level pattern amplifies more
with strong NW flow aloft through the plains. This allows for
another trough axis to push through in the flow on Friday. Ecmwf
had been quite aggressive with precipitation and it has backed off
on that notion for Friday. A cold front should push through
Friday with really no effect other than to allow for more drier
air to filter into the region. Saturday high pressure moves east
and the allows for return flow on Sunday into Monday. There may be
some moisture return for showers to develop but really do not
have enough confidence to put mention of precipitation in the
forecast.

Overpeck

Marine
Moderate offshore winds should persist today and Tuesday with low
seas. Winds turn around back onshore Tuesday night into Wednesday
ahead of the next cold front. The front should push off the coast
by Thursday morning. There may be strong enough northerly winds on
Thursday to need small craft exercise caution but it should be
short lived. Winds remain north to northeast for the end of the
week. Seas should be at low levels for much of the week with maybe
a slight increase Thursday with stronger winds behind the front.

Overpeck

Preliminary point temps pops
College station (cll) 77 55 83 59 79 0 0 0 0 20
houston (iah) 78 58 84 61 83 0 0 0 0 10
galveston (gls) 75 64 77 67 76 0 0 0 0 10

Hgx watches warnings advisories
Tx... None.

Gm... None.

Near term... Overpeck
short term... Overpeck
long term... Overpeck
aviation... Luchs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 6 mi55 min NNE 5.1 G 7 64°F 69°F1016 hPa
MGPT2 - 8770613 - Morgans Point, TX 9 mi49 min WSW 1.9 G 1.9
GRRT2 18 mi55 min N 7 G 8.9 63°F 70°F1016.1 hPa
NCHT2 - 8770777 - Manchester, TX 19 mi49 min NNW 1 G 1.9
GTOT2 20 mi49 min N 5.1 G 6
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 20 mi55 min N 8 G 8.9 69°F1015.9 hPa
RLOT2 - 8770971 - Rollover Pass, TX 26 mi49 min NNW 8 G 8.9
HIST2 32 mi55 min NW 4.1 G 5.1 58°F 68°F1016.6 hPa
LUIT2 33 mi49 min NNE 13 G 15 65°F 1016 hPa
KXIH 36 mi42 min N 11 66°F 50°F
42035 - GALVESTON 22NM East of Galveston, TX 38 mi107 min NNW 14 G 16 66°F 69°F2 ft1016.6 hPa (+0.0)52°F
FCGT2 - 8772447 - USCG Freeport, TX 45 mi55 min N 5.1 G 7 60°F 71°F1016.9 hPa

Wind History for Eagle Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX10 mi47 minNNE 210.00 miFair55°F50°F82%1016.3 hPa
Houston, Pearland Regional Airport, TX13 mi44 minN 010.00 miFair54°F53°F97%1016.7 hPa
Houston, Houston Hobby Airport, TX16 mi44 minNE 310.00 miFair55°F53°F93%1016.7 hPa
Galveston, Scholes Field, TX21 mi45 minN 910.00 miFair64°F53°F68%1016.6 hPa
John Dunn Helistop, TX24 mi42 minN 710.00 miFair61°F46°F59%1015.9 hPa

Wind History from EFD (wind in knots)
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Last 24hrNW10NW10NW10SW13--NW10NW12NW12NW9NW10NW10NW14NW13NW12--NW6NW6NW7NW6N6N3N4CalmN2
1 day agoE9E13E10E10E10E13E13E13E16E16E9E11SE9SE10
G16
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SE12SE7SE10SE11
G20
S8N10--W4--
2 days agoNE8NE6NE8NE6E10NE11E9E6E8E8E9E11SE14E8--E8E9E11E6E7E7E9E8E8

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Mon -- 02:39 AM CDT     Moonset
Mon -- 06:45 AM CDT     Sunrise
Mon -- 11:38 AM CDT     -0.17 feet Low Tide
Mon -- 01:44 PM CDT     Moonrise
Mon -- 07:52 PM CDT     Sunset
Mon -- 08:08 PM CDT     0.79 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.60.60.60.60.50.40.30.1-0-0.1-0.2-0.2-0.100.20.40.60.70.80.80.80.70.7

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Mon -- 02:38 AM CDT     Moonset
Mon -- 04:55 AM CDT     -1.73 knots Max Ebb
Mon -- 06:44 AM CDT     Sunrise
Mon -- 09:12 AM CDT     0.00 knots Slack
Mon -- 01:00 PM CDT     1.85 knots Max Flood
Mon -- 01:44 PM CDT     Moonrise
Mon -- 07:06 PM CDT     -0.00 knots Slack
Mon -- 07:50 PM CDT     Sunset
Mon -- 09:57 PM CDT     -0.69 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.9-1-1.3-1.5-1.7-1.7-1.6-1.3-0.8-0.20.61.31.71.81.71.51.10.80.40-0.3-0.6-0.7-0.6

Weather Map and Satellite Images
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wmap_A
GOES Local Image of SouthCentralPlains    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
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.