Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Oak Island, 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 6:40AMSunset 7:54PM Wednesday April 25, 2018 9:01 PM CDT (02:01 UTC) Moonrise 2:48PMMoonset 3:09AM Illumination 82% Phase: Waxing Gibbous; Moon at 11 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- 1017 Am Cdt Wed Apr 25 2018
Today..Variable winds around 5 knots becoming southeast 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon.
Tonight..South winds near 15 knots becoming north after midnight. Bay waters choppy. A slight chance of showers in the evening. Isolated Thunderstorms. A chance of showers after midnight.
Thursday..North winds 10 to 15 knots becoming northwest 5 to 10 knots in the afternoon. Bay waters slightly choppy becoming smooth in the afternoon.
Thursday night..North winds 5 to 10 knots. Bay waters smooth.
Friday..North winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon.
Friday night..North winds 10 to 15 knots becoming northeast 5 to 10 knots after midnight. Bay waters slightly choppy becoming smooth after midnight.
Saturday..East winds 5 to 10 knots becoming southeast in the afternoon. Bay waters smooth.
Saturday night..Southeast winds 5 to 10 knots. Bay waters smooth.
Sunday..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Sunday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 1017 Am Cdt Wed Apr 25 2018
Synopsis for high island to matagorda ship channel out 60 nm.. Light winds and low seas should persist until a weak cold front and associated showers move through the area tonight. The offshore flow behind the front will persist through the end of the week as another cold front moves through the area on Friday. Onshore winds that are expected to return late Saturday or Saturday night should persist through at least the first half of next week.

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 252339
afdhgx
area forecast discussion
national weather service houston galveston tx
639 pm cdt Wed apr 25 2018

Update
Area of rain to the west and showers and thunderstorms developing
along near the cold front seabreeze early this evening. Quick
update to the forecast for ongoing trends based on radar. Expect
the strong severe thunderstorms to remain well southwest of the
area. Rapid cooling behind the front with temperatures falling
into the mid 60s in the coming hour around college station and
crockett.

45

Prev discussion issued 633 pm cdt Wed apr 25 2018
aviation...

the khgx radar shows the cold front stretching from roughly near
66r to iah to jas early this evening with a sea breeze located
near 66r to south of hou. Isolated shra have been able to develop
immediately behind the cold front with greater coverage near the
collision of the cold front and sea breeze west of the houston
terminals. Would expect additional shra to develop through sunset
near the houston terminals and sgr as these boundaries continue to
interact and have started the 00z tafs with shra tempos for these
terminals. Cannot rule out isolated TS with steep low level lapse
rates evident on aircraft soundings out of hobby but these
soundings also show a weak warm nose persisting around 700 mb.

This makes confidence in any TS at the terminals low, but enhanced
lift from the cold front and sea breeze colliding within the next
hour or so at hou sgr will mean these terminals need to be
monitored for possible TS amendments. A secondary round of
elevated shra will be possible tonight as a mid-level speed max
translates across the region roughly between 01-12z.

Vfr conditions are expected to prevail outside of shra (with
temporary MVFR CIGS in any rain). North winds 10-15 knots with
gusts 20-25 knots will be possible immediately behind the front as
it continues to translate towards the coast through midnight.

Northerly winds in the 5-10 knot range are expected to become
established by sunrise and prevail through the period.

Huffman
prev discussion... Issued 314 pm cdt Wed apr 25 2018
discussion...

a cold front will push through the area this afternoon into
tonight, with showers and thunderstorms developing along and
behind the line this evening. Hi-res guidance is indicating that
the cluster of storms currently near san antonio will push
southeastward towards matagorda bay later this evening, so the
highest pops for today are focused down there as the coverage
elsewhere looks to be more broken. Offshore winds and dry
conditions are expected in the wake of the front starting tonight.

Another weak front will push through on Friday, but most people
probably won't even notice. Beautiful and warm weather is expected
Thursday through the weekend, with onshore flow returning
Saturday.

Upper-level ridging moves off to the east Sunday night, setting up
southwesterly flow aloft. Several shortwaves rotate across the
area early next week, bringing slight chances for showers and
thunderstorms back into the forecast. Coverage (if any) will
largely depend on the timing of the shortwaves and how much
moisture return we can get prior to their arrival.

11
marine...

cool front will be making its way off the coast probably sometime
between 10pm-1am. May see some iso sct shra along and behind the
boundary with better coverage near the matagorda bay area. Hoisted
the caution flags overnight as offshore winds increase. It should be
noted however that some of the hires model runs have been
intermittently advertising some sustained 20-25kt winds lasting for
about 3 hours after the windshift. Will let the next shift
reevaluate trends and possible upgrade to advisory flags. Winds seas
will subside thurs afternoon. Look for a weak reinforcing front
Friday morning. Light winds and low seas will prevail over the
weekend with high pres in control. Onshore winds will increase and
seas build early next week.

47

Preliminary point temps pops
College station (cll) 51 76 53 76 52 30 0 0 0 0
houston (iah) 56 78 57 79 56 30 0 0 0 0
galveston (gls) 62 74 63 75 64 60 0 0 0 0

Hgx watches warnings advisories
Tx... None.

Gm... Small craft should exercise caution from midnight cdt tonight
through Thursday morning 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... 45


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGPT2 - 8770613 - Morgans Point, TX 16 mi44 min SW 7 G 12 75°F 73°F1014.9 hPa
RLOT2 - 8770971 - Rollover Pass, TX 16 mi44 min SW 8 G 11 74°F 77°F1015 hPa
HIST2 18 mi50 min SW 7 G 8.9 72°F 73°F1015 hPa
EPTT2 - 8771013 - Eagle Point, TX 20 mi44 min WSW 9.9 G 12 74°F 78°F1014.9 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 24 mi50 min SW 15 G 16 73°F 73°F1014.5 hPa
GTOT2 28 mi44 min WSW 6 G 11 74°F 74°F1014.9 hPa
GRRT2 30 mi44 min SW 12 G 15 74°F 77°F1014.8 hPa
NCHT2 - 8770777 - Manchester, TX 31 mi44 min NW 6 G 8.9 78°F 73°F1014.8 hPa
SRST2 - Sabine Pass, TX 35 mi62 min SW 9.9 G 12 72°F 1014.8 hPa (-0.6)
KXIH 38 mi27 min SW 15 75°F 66°F
PORT2 - 8770475 - Port Arthur, TX 42 mi44 min SW 13 G 16 72°F 70°F1014.5 hPa
SBPT2 - 8770570 - Sabine Pass North, TX 43 mi44 min SSW 6 G 11 72°F 73°F1016.1 hPa
TXPT2 45 mi44 min SW 12 G 15 72°F 72°F1013.9 hPa
LUIT2 49 mi44 min SW 8 G 13 74°F 1015.2 hPa

Wind History for Rollover Pass, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX26 mi2.2 hrsS 1010.00 miOvercast81°F60°F51%1014.9 hPa

Wind History from EFD (wind in knots)
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Last 24hrS5S6SW5SW7SW4SW3W3CalmCalmE3S4CalmS3--SW3S4S6S3SW4CalmS11S10S10S5
1 day ago--CalmCalmCalmN1CalmSW2N2--SW1CalmCalm--NW4N6N8N5W4N3NW3NW8W4N4S5
2 days agoNW6NW7NW6N6N3N4CalmN2SE1SW2W5W5W5W8W7NW10
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Tide / Current Tables for Round Point, Trinity Bay, Galveston Bay, Texas
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Round Point
Click for Map
Wed -- 12:01 AM CDT     0.88 feet Low Tide
Wed -- 02:57 AM CDT     0.94 feet High Tide
Wed -- 04:09 AM CDT     Moonset
Wed -- 06:41 AM CDT     Sunrise
Wed -- 11:33 AM CDT     0.22 feet Low Tide
Wed -- 03:48 PM CDT     Moonrise
Wed -- 07:28 PM CDT     1.02 feet High Tide
Wed -- 07:51 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.90.90.90.90.90.80.70.50.40.30.20.20.30.50.60.80.911110.90.8

Tide / Current Tables for Point Barrow, Trinity Bay, Texas
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Point Barrow
Click for Map
Wed -- 01:09 AM CDT     0.78 feet Low Tide
Wed -- 04:09 AM CDT     Moonset
Wed -- 06:18 AM CDT     0.94 feet High Tide
Wed -- 06:42 AM CDT     Sunrise
Wed -- 12:13 PM CDT     0.19 feet Low Tide
Wed -- 03:49 PM CDT     Moonrise
Wed -- 07:52 PM CDT     Sunset
Wed -- 08:24 PM CDT     1.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.80.80.80.90.90.90.90.80.60.40.30.20.20.30.40.60.70.911.11.110.8

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 (22,6,7,8)
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Ground Weather Radar Station Houston/Galveston, TX
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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.