Sunday, April30, 2017 L-36.com


Marine Weather and Tides
Oak Island, 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 6:35AMSunset 7:58PM Sunday April 30, 2017 9:47 AM CDT (14:47 UTC) Moonrise 9:34AMMoonset 11:37PM Illumination 21% Phase: Waxing Crescent; Moon at 5 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- 333 Am Cdt Sun Apr 30 2017
.small craft advisory in effect until 7 am cdt this morning...
Today..Northwest winds 20 to 25 knots diminishing to 15 to 20 knots this morning...and then to 10 to 15 knots in the afternoon. Bay waters choppy to rough becoming slightly choppy. A slight chance of showers and Thunderstorms in the morning.
Tonight..Northwest winds 10 to 15 knots becoming south 5 to 10 knots after midnight. Bay waters slightly choppy becoming smooth after midnight.
Monday..South winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon.
Monday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers. A chance of Thunderstorms after midnight.
Wednesday..South winds 10 to 15 knots increasing to 15 to 20 knots in the afternoon. Bay waters slightly choppy becoming choppy in the afternoon. Showers and Thunderstorms.
Wednesday night..South winds 10 to 15 knots becoming north 15 to 20 knots after midnight. Bay waters slightly choppy becoming choppy after midnight. Showers and Thunderstorms likely in the evening, then a chance of showers and Thunderstorms after midnight.
Thursday..North winds 15 to 20 knots. Bay waters choppy. A slight chance of showers and Thunderstorms in the morning.
Thursday night..Northwest winds 15 to 20 knots decreasing to 10 to 15 knots after midnight. Bay waters choppy becoming slightly choppy after midnight.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 333 Am Cdt Sun Apr 30 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Moderate to strong offshore winds developing in the wake of a cold front will persist into this afternoon. Even with the offshore flow...the elevated long period swells will be slow to diminish. Onshore winds will resume Monday as high pressure moves off to the east. Another cold front is expected Wednesday night.

7 Day Forecast for Marine Location Near Oak Island, TX
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location: 29.71, -94.69     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 301119
afdhgx
area forecast discussion
national weather service houston/galveston tx
619 am cdt Sun apr 30 2017

Aviation
Vfr conditions have developed. However, the right-rear quadrant of
the jet will help keep a chance of showers and isolated thunder-
storms at kcll and possibly kuts through 14z. Isolated showers may
develop elsewhere but the chances were too low to mention. Radar
coverage and model trends point toward just the far northern
sites.

During the late morning through the afternoon, expect winds to
become breezy as the surface pressure gradient tightens over the
area and cold air advection begins in earnest. Models and guidance
have the wind speeds diminishing around sunset. High pressure will
then move overhead tonight and Monday morning.

40

Prev discussion /issued 402 am cdt Sun apr 30 2017/
discussion...

at 3 am, a cold front had crossed most of the cwa. Rain was still
training over parts of extreme eastern chambers county but this
precip will be well east of the CWA by sunrise. Some elevated
convection over the hill country could also clip parts of the
western CWA but this is also expected to diminish this morning as
a weak disturbance rotating around the upper low over the
panhandle exits the area. The rest of today looks fantastic with
cooler temperatures and much drier air working into the region.

Sfc dew pts have already fallen into the 50's and will fall into
the upper 40's this afternoon. The pressure gradient will remain
tight today as high pressure builds over the state and breezy
northwest winds will be gusty at times. MAX temps will be about
15 to 20 degrees cooler today due to cooler 850 mb temps coupled
with strong CAA at the sfc. The upper flow will be zonal on Monday
and much of the active weather will remain north and east of se
tx. Sfc high pressure will drift across SE tx and will be east of
the region by evening. Onshore winds return Monday night and low
level moisture begins to return. Could get some patchy fog early
Tuesday morning. An upper level trough will dig into northern
mexico on Tuesday and the flow aloft will become sw. A weak
disturbance embedded in the upper flow will approach the area
Tuesday night. This feature coupled with WAA will bring the region
a chance of showers.

Things get a bit more interesting on Wednesday. A short wave
trough will dive into the central/southern plains and this feature
will carve out a deeper long wave trough over texas. A series of
upper level disturbances will move across SE tx on Wednesday and
periods of showers and thunderstorms look likely. Fcst soundings
look robust with CAPE values over 4000, li's around -12 and steep
lapse rates. Fcst soundings don't show much in the way of capping
and convective temps are reasonably low, around 83 degrees. Think
the threat for severe weather exists and probably a better chance
for severe weather than what was observed this weekend. The cips
analog page showed that past weather events such as the one
coming up on Wednesday has produced wind damage and large hail and
around 1-2 inches of rain. Will go likely pops for Wednesday into
Wednesday night. A cold front will cross SE tx Wednesday night
ending the rain threat and ushering in cooler and drier weather to
end the work week. Upper level ridging tries to assert itself for
next weekend with dry weather likely to continue into next
weekend with warmer temperatures. 43
marine...

will continue to need a small craft advisory out through 1:00 pm for
all the gulf waters. Winds will then diminish below criteria over
the nearshore waters; although, will then need to keep the SCA up
through the mid evening for the offshore waters as long-period
swells will continue to help keep the seas up even after the winds
diminish.

Will keep the coastal flood advisory up through 7:00 am. There is a
period of low astronomically predicted tides later this morning; so,
overall tide levels will be subsiding. Also helping out the
diminishing tide levels will be moderate to strong offshore winds
developing behind the cold front.

40

Preliminary point temps/pops
College station (cll) 73 51 84 59 88 / 30 0 0 0 10
houston (iah) 75 55 84 62 88 / 10 0 0 0 10
galveston (gls) 76 67 81 71 84 / 10 0 0 0 10

Hgx watches/warnings/advisories
Tx... Coastal flood advisory until 7 am cdt this morning for the
following zones: brazoria... Chambers... Galveston...

matagorda.

Gm... Small craft advisory until 7 am cdt this morning for the
following zones: galveston bay... Matagorda bay.

Small craft advisory until 2 pm cdt this afternoon 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.

Small craft advisory until 10 pm cdt this evening 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... 43
aviation/marine... 40


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGPT2 - 8770613 - Morgans Point, TX 16 mi48 min NW 12 G 15 65°F 76°F1011.9 hPa (+2.9)
RLOT2 - 8770971 - Rollover Pass, TX 16 mi48 min NNW 14 G 17 64°F 71°F1011.6 hPa (+2.5)
HIST2 18 mi48 min NNW 7 G 9.9 63°F 76°F1011.6 hPa (+1.9)
EPTT2 - 8771013 - Eagle Point, TX 20 mi48 min NNW 9.9 G 16 65°F 76°F1011.8 hPa (+2.7)
LYBT2 21 mi48 min WNW 9.9 G 13 62°F 76°F1011.5 hPa (+2.9)
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 24 mi48 min NNW 11 G 14 75°F1011.6 hPa (+3.0)
GTOT2 28 mi48 min 66°F 76°F
GRRT2 30 mi48 min NNW 13 G 15 65°F 76°F1011.9 hPa (+3.1)
NCHT2 - 8770777 - Manchester, TX 31 mi48 min NW 8 G 12 63°F 76°F1012.3 hPa
SRST2 - Sabine Pass, TX 35 mi108 min N 12 G 14 60°F 1011.2 hPa (+2.7)53°F
42035 - GALVESTON 22NM East of Galveston, TX 36 mi118 min NNW 21 G 25 67°F 76°F6 ft1010 hPa (+2.2)53°F
KXIH 38 mi33 min NNE 11 G 17 66°F 52°F
PORT2 - 8770475 - Port Arthur, TX 42 mi48 min NNW 7 G 12 62°F 76°F1010.1 hPa (+0.8)
SBPT2 - 8770570 - Sabine Pass North, TX 43 mi48 min N 12 G 16 66°F 78°F1011.5 hPa (+1.5)
TXPT2 45 mi48 min NNW 18 G 20 64°F 76°F1010.1 hPa (+1.5)
LUIT2 49 mi48 min NNW 18 G 21 65°F 76°F

Wind History for Rollover Pass, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX26 mi58 minWNW 910.00 miOvercast64°F46°F52%1012.5 hPa

Wind History from EFD (wind in knots)
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S5SW5--NW7--NW12NW11NW10NW7NW9
1 day agoSE17
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SE12SE12SE14SE13SE10SE12SE13SE13SE12SE12SE13--SE15
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2 days agoNE8E8E9--E9SE8E8E5SE8E7E5SE9SE9SE6SE8SE5SE7SE6SE7SE8SE9S7SE11SE12

Tide / Current Tables for Round Point, Trinity Bay, Galveston Bay, Texas
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Round Point
Click for Map
Sun -- 05:59 AM CDT     -0.01 feet Low Tide
Sun -- 06:36 AM CDT     Sunrise
Sun -- 10:34 AM CDT     Moonrise
Sun -- 03:21 PM CDT     1.23 feet High Tide
Sun -- 07:55 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.60.40.20.10-000.20.40.60.811.11.21.21.21.21.11.11111

Tide / Current Tables for Point Barrow, Trinity Bay, Texas
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Point Barrow
Click for Map
Sun -- 06:11 AM CDT     -0.21 feet Low Tide
Sun -- 06:37 AM CDT     Sunrise
Sun -- 10:34 AM CDT     Moonrise
Sun -- 03:45 PM CDT     1.32 feet High Tide
Sun -- 07:55 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.90.70.40.1-0.1-0.2-0.2-0.10.10.30.60.81.11.21.31.31.31.21.11.11.11.11.1

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 (10,2,3,4)
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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.