Sunday, March26, 2017 L-36.com


Marine Weather and Tides
Port O'Connor, 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 7:22AMSunset 7:44PM Sunday March 26, 2017 7:40 PM CDT (00:40 UTC) Moonrise 5:30AMMoonset 5:27PM Illumination 0% Phase: New Moon; Moon at 29 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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GMZ330 Matagorda Bay- 351 Pm Cdt Sun Mar 26 2017
Tonight..South winds 10 to 15 knots. Bay waters slightly choppy. Haze in the evening.
Monday..South winds 10 to 15 knots. Bay waters slightly choppy.
Monday night..Southeast winds around 10 knots. Bay waters smooth to slightly choppy.
Tuesday..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday night..Southeast winds 15 to 20 knots. Bay waters choppy.
Wednesday..South winds 10 to 15 knots. Bay waters slightly choppy. A chance of Thunderstorms in the morning. A chance of showers. A chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall in the afternoon.
Wednesday night..South winds 10 to 15 knots decreasing to 5 to 10 knots after midnight. Bay waters slightly choppy becoming smooth after midnight. A slight chance of showers and Thunderstorms in the evening, then a chance of showers and Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall in the evening.
Thursday..West winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms.
Thursday night..North winds around 5 knots becoming east after midnight. Bay waters smooth.
Friday..Southeast winds 5 to 10 knots. Bay waters smooth.
Friday 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 351 Pm Cdt Sun Mar 26 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Onshore winds will gradually strengthen tonight. Strong southerly flow should develop on Wednesday as another storm system moves into the southern plains. A weak cold front should move through the upper texas coastal waters early Thursday.

7 Day Forecast for Marine Location Near Port O'Connor CDP, TX
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location: 28.44, -96.4     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 262112
afdhgx
area forecast discussion
national weather service houston/galveston tx
412 pm cdt Sun mar 26 2017

Discussion
An upper level disturbance is continuing to move west just north of
the texas panhandle this afternoon. As this shortwave continues to
propagate westward overnight and into Monday, there will be a slight
chance for showers and isolated thunderstorms for the northern zones
of our CWA in the early morning hours. This chance for precipitation
will sink easterly through the late morning. The NAM and gfs
forecast soundings show a decent cap at 850mb, that hangs tight
throughout the day Monday. Therefore, not expecting too much in the
means of convection for Monday, but still cannot rule out the chance
for showers and an isolate thunderstorm. By late Monday evening, the
likeliness for showers will diminish, and the overnight hours should
be dry.

The surface pressure gradient begins to tighten on Tuesday between
18-06z, as the next upper level disturbances begins to slide in from
the west. Model guidance shows positive vorticity being advected
into the far inland region, beginning early Wednesday morning around
06z, and continues to stream in a channel of positive vorticity
through 00z Friday. A few disturbances embedded within this band of
vorticity, will result in an extended period of precipitation
Wednesday and throughout the day Thursday. Beginning Wednesday
morning, high temperatures in the mid 80s should well surpass
convection temperatures in the upper 70s/ lower 80s. Forecast
soundings during this time period also pick up on higher values of
precipitable waters, ranging between 1.25-1.75 inches. The
capping inversion should also erode by late morning, allowing for
deep convective initiation to occur by early afternoon. The storm
relative helicity values between the surface and up to one
kilometer increase Wednesday morning and into the early afternoon,
from 230-300m^2/s^2. CAPE values will also range between
2500-3500j/kg Wednesday afternoon and into the evening, therefore
slightly concern about the chance for some low level rotation in
developing storms. Forecast soundings are also indicating the
possibility of hail formation, as the CAPE values will be large,
and wet bulb zero heights will fall below 10,000ft.

On Thursday, the trough slings through the region, and heights begin
to rise behind it. Conditions for convection improve Thursday, as
the forecast soundings have CAPE and SRH values diminishing, and a
low level cap holds tight throughout the day. Expecting the chance
for showers and thunderstorms to linger, and slowly dissipate by
late Thursday evening.

High temperatures will remain in the lower 80s Thursday and increase
by a degree or two come Friday. Drier conditions with lower
precipitable water values move in Friday morning and will hold tight
through Saturday morning. Saturday afternoon, another upper level
feature moves into north texas, and will bring in the next best
chance for precipitation.

Hathaway

Marine
Winds coming back up as expected with increasing gradient and
development of LLJ to the west. Winds in the 20-60nm waters into
scec conditions and could bump up and stay in sca... Evening shift
will need to keep an eye on trends there. Building seas through
Wednesday. Seas of 6-8 feet should common by Wednesday morning in
the offshore waters. Slowly lowering after the main trough axis
comes through Wednesday night/Thursday and winds pivot around with
the frontal passage. CAA is weak and don't expect strong winds in
the wake of the front.

45

Aviation
MVFR at gls with haze of 2-5 miles should continue this evening
around the coast. Stratus deck should reform over the south and
spread inland today. MVFR CIGS should dominate the area terminals
between 03z-15z with CIGS lowering slowly after 06z. May get close
to llws conditions near uts in the morning 06-15z as LLJ shifts
across the region and then east of the area. Stratus should be
slower to lift Monday morning than it was today.

45

Preliminary point temps/pops
College station (cll) 66 83 67 85 68 / 20 20 10 10 20
houston (iah) 67 85 68 85 71 / 10 30 10 10 10
galveston (gls) 70 83 70 82 73 / 10 10 10 10 10

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

Gm... Small craft should exercise caution until 4 am cdt Monday 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... 08


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PCNT2 - 8773701 - Matagorda Bay; Port O'Connor, TX 0 mi40 min SE 16 G 18 74°F 1009.8 hPa (-0.4)
MBET2 4 mi40 min S 14 G 17 73°F
SDRT2 - 8773037 - Seadrift, TX 17 mi40 min ESE 14 G 20 75°F 79°F1009.9 hPa (-0.3)
VCAT2 18 mi40 min SSE 19 G 24 75°F 78°F1009.4 hPa (-0.6)
AWRT2 26 mi40 min SSE 15 G 18 74°F 78°F1009.5 hPa (-0.5)
EMAT2 32 mi40 min SE 12 G 18 74°F 77°F1009.9 hPa (-0.6)
KBBF 38 mi25 min S 18 73°F 68°F
MAXT2 - Mission-Aransas Reserve, TX 40 mi40 min 12 75°F 1010 hPa (-0.0)71°F
CPNT2 40 mi40 min SSE 12 G 16 74°F 77°F
KBQX 42 mi25 min SSE 11 75°F 75°F
RCPT2 - 8774770 - Rockport, TX 45 mi40 min S 15 G 21 75°F 78°F1009 hPa (-0.4)
SGNT2 47 mi40 min SE 12 G 15 74°F 77°F1010.4 hPa (-0.7)

Wind History for Port OConnor, TX
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SE17
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Lavaca - Calhoun County Airport, TX21 mi45 minSSE 17 G 2210.00 miOvercast75°F70°F85%1009.8 hPa
Palacios Municipal Airport, TX21 mi47 minSSE 18 G 2510.00 miMostly Cloudy and Breezy75°F68°F79%1010.2 hPa

Wind History from PKV (wind in knots)
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Last 24hrS8S8S3CalmCalmS7CalmCalmCalmCalmCalmCalmCalmCalmS13S14SE17
G24
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1 day agoS14
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S12SW7SW7CalmCalmCalmN9
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2 days agoSE16
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Tide / Current Tables for Port O'Connor, Matagorda Bay, Texas
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Port O'Connor
Click for Map
Sun -- 03:12 AM CDT     0.52 feet High Tide
Sun -- 06:29 AM CDT     Moonrise
Sun -- 07:22 AM CDT     Sunrise
Sun -- 11:56 AM CDT     0.16 feet Low Tide
Sun -- 06:26 PM CDT     Moonset
Sun -- 07:40 PM CDT     Sunset
Sun -- 08:22 PM CDT     0.42 feet High Tide
Sun -- 10:58 PM CDT     0.40 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.50.50.50.50.50.50.40.30.30.20.20.20.20.20.30.30.40.40.40.40.40.40.4

Tide / Current Tables for Port Lavaca, Lavaca Causeway, Matagorda Bay, Texas
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Port Lavaca
Click for Map
Sun -- 02:34 AM CDT     0.74 feet Low Tide
Sun -- 05:51 AM CDT     0.79 feet High Tide
Sun -- 06:30 AM CDT     Moonrise
Sun -- 07:22 AM CDT     Sunrise
Sun -- 02:16 PM CDT     0.25 feet Low Tide
Sun -- 06:27 PM CDT     Moonset
Sun -- 07:41 PM CDT     Sunset
Sun -- 09:51 PM CDT     0.77 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.80.70.70.80.80.80.80.70.70.60.50.40.30.30.30.30.40.50.60.70.80.80.8

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 (20,4,5,8)
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Ground Weather Radar Station Corpus Christi, TX
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weather_mapweather_map weather_map

Gulf Stream Current


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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.