Friday, September22, 2017 L-36.com


Marine Weather and Tides
Port Lavaca, TX

Version 3.4
What's New / NOTES
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.
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.

Sunrise 7:15AMSunset 7:24PM Friday September 22, 2017 7:12 PM CDT (00:12 UTC) Moonrise 8:26AMMoonset 8:14PM Illumination 6% 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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GMZ330 Matagorda Bay-galveston Bay- 310 Pm Cdt Fri Sep 22 2017
Tonight..Southeast winds 10 to 15 knots becoming east 5 to 10 knots after midnight. Bay waters slightly choppy becoming smooth after midnight. A slight chance of showers and Thunderstorms after midnight.
Saturday..East winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon. A slight chance of showers and Thunderstorms.
Saturday night..Southeast winds 10 to 15 knots decreasing to 5 to 10 knots after midnight. Bay waters slightly choppy becoming smooth after midnight.
Sunday..East winds 5 to 10 knots becoming southeast 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon. A chance of showers and Thunderstorms.
Sunday night..Southeast 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.
Monday..Southeast winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Monday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms.
Tuesday..Southeast winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon. A chance of showers and Thunderstorms.
Tuesday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms.
Wednesday..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers and Thunderstorms.
Wednesday night..Southeast winds 10 to 15 knots becoming east 5 to 10 knots after midnight. Bay waters slightly choppy becoming smooth after midnight. 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 310 Pm Cdt Fri Sep 22 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Light to moderate southeast winds and seas of 2 to 3 feet will continue well into next week. Winds may approach caution criteria at times. Periods of showers and Thunderstorms are expected across the waters each day, with the greatest potential during the early morning hours.

7 Day Forecast for Marine Location Near Port Lavaca, TX
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location: 28.64, -96.6     debug


Area Discussion for - Corpus Christi, TX
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Fxus64 kcrp 230008 aaa
afdcrp
area forecast discussion... Updated
national weather service corpus christi tx
708 pm cdt Fri sep 22 2017

Discussion Isolated convection will continue for another hour
or two over the western brush country. Will update forecast to
include mention of isolated storms early this evening. See
aviation section for 00z tafs.

Aviation Vfr conditions will continue into the early overnight
hours except for the next couple of hours over the western brush
country where isolated convection will provide MVFR vsbys. Light
winds and high boundary layer moisture will lead to patchy fog
over the inland coastal plains from 09z until 14z. Fog may get
worse in the vct area with possibility of ifr vsbys. GOES 16 image
of precipitable water shows an axis of higher moisture over the
gulf into the coastal bend. With adequately steep low level lapse
rates, should see isolated streamer showers along the coast into
the crp area Saturday morning. MVFR ceilings will become prevalent
over the southern coastal bend and continue into early afternoon
with isolated showers and thunderstorms moving inland with the sea
breeze boundary. MVFR ceilings will develop around 08z for the lrd
area and continue until late morning.VFR conditions will be
prevalent for the afternoon except for MVFR vsbys within isolated
convection.

Previous discussion issued 324 pm cdt Fri sep 22 2017
short term (tonight through Saturday night)...

not much change in the weather pattern and or airmass ergo not much
change in the forecast for these periods. The upper ridge is
blocking the western trough from making any eastward progress but the
trough to the east is not moving much either. Thus the area is stuck
in a similar airmass with only subtle differences in moisture. With
no significant changes in winds (higher or lower), pretty much will
continue to go with 10 to 30 pops for Saturday, with rain chances
toward morning near the coast with the coastal convergence
showers possible thunderstorms. Will play the same slightly higher
chance for rain Saturday over the NE in the morning pushing NW in
the afternoon, with slight chance other locations again along the
weak sea-breeze. Rain should taper off again by early evening with
another round of rain possible near the coast toward Sunday morning.

Overnight lows a blend of mosguide and previous forecast. For highs
on Saturday, mainly used a blend of bias-corrected blended model and
previous forecast.

Marine (tonight through Saturday night)...

generally weak to near moderate flow through Saturday night, with
showers possible thunder developing again overnight especially near
the coast then tapering off in the afternoon with the weak sea-
breeze.

Long term (Sunday through Friday)...

overall pattern in the long term period remains the same, but
wavering a bit on confidence with rain chances latter half of the
period. While moisture will most likely be plentiful, upper support
is questionable. Latest model runs cut off an upper level low
earlier than previous runs, causing upper trough to tilt back to the
southwest and not progress toward texas. This could result in
ridging remaining over the eastern portion of the forecast area with
some of the upper level energy over western portions of the area. As
we're still talking about days 4 and 5 will continue to broad-brush
a chance pop area wide until the finer details can be ironed out.

Regardless of the upper support, the moisture and sea breeze should
be enough to give us at least some convection daily. Will expect
abundant clouds through much of the period as well. As for the
potential for a cold front late in the week, still plenty of
question with that and tilting of the upper level trough could rob a
lot of the energy necessary to pull the front this far south. If it
does make it through, dont think we're looking at anything game
changing. A shift to an east or northeast wind and temperatures
maybe a few degrees cooler... But again... It's a long way down the
road and still lots of questions.

Temperatures should see a very gradual decline through the period
with highs in the low to mid 90s early, dropping into the upper 80s
and lower 90s as moisture increases. Lows remain mainly in the 70s.

Preliminary point temps pops
Corpus christi 76 91 76 91 76 20 20 10 30 20
victoria 73 90 73 92 73 10 30 10 30 20
laredo 78 96 78 96 76 10 10 10 20 20
alice 74 93 74 94 74 10 20 10 30 10
rockport 79 90 79 90 78 30 30 10 30 20
cotulla 75 95 75 96 74 10 20 10 20 20
kingsville 75 92 75 94 75 20 20 10 30 10
navy corpus 80 90 80 88 79 30 20 10 30 20

Crp watches warnings advisories
Tx... None.

Gm... None.

Xx 99... Short term


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
VCAT2 0 mi42 min ESE 16 G 18 83°F 86°F1011.3 hPa
SDRT2 - 8773037 - Seadrift, TX 17 mi42 min E 8 G 14 84°F 86°F1011.5 hPa
PCNT2 - 8773701 - Matagorda Bay; Port O'Connor, TX 17 mi42 min ESE 15 G 17 83°F 85°F1011.3 hPa
MBET2 21 mi42 min SE 15 G 17 83°F 85°F1010.5 hPa
AWRT2 30 mi42 min E 12 G 16 84°F 86°F1011.2 hPa
EMAT2 37 mi42 min E 9.9 G 12 83°F 86°F1011.8 hPa
CPNT2 43 mi42 min E 8.9 G 13 83°F 84°F

Wind History for Port OConnor, TX
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Lavaca - Calhoun County Airport, TX4 mi2.3 hrsESE 1110.00 miMostly Cloudy84°F72°F69%1012.5 hPa
Palacios Municipal Airport, TX19 mi4.3 hrsSE 1110.00 miFair87°F71°F59%1013.2 hPa
Victoria, Victoria Regional Airport, TX23 mi4.4 hrsSSW 610.00 miThunderstorm in Vicinity74°F71°F91%1013.7 hPa

Wind History from PKV (wind in knots)
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Last 24hr------------------------------SE5SE3E10E9SE11SE12
G17
E12--SE11
1 day ago------------SE6SE6--------------SE3S7S8----S11
G18
--S8SE14
2 days agoS11
G15
SE10SE9SE5SE5SE7SE9SE7S5CalmS4S4SE5------S10S9--S11
G17
S10
G15
S11SE13S11
G15

Tide / Current Tables for Port Lavaca, Lavaca Causeway, Matagorda Bay, Texas
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Port Lavaca
Click for Map
Fri -- 05:16 AM CDT     0.71 feet Low Tide
Fri -- 07:14 AM CDT     Sunrise
Fri -- 08:19 AM CDT     0.74 feet High Tide
Fri -- 09:26 AM CDT     Moonrise
Fri -- 03:57 PM CDT     0.48 feet Low Tide
Fri -- 07:22 PM CDT     Sunset
Fri -- 09:14 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.90.80.80.70.70.70.70.70.70.70.70.60.60.50.50.50.50.60.60.70.80.90.9

Tide / Current Tables for Seadrift, San Antonio Bay, Texas
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Seadrift
Click for Map
Fri -- 01:28 AM CDT     0.43 feet High Tide
Fri -- 07:15 AM CDT     Sunrise
Fri -- 08:27 AM CDT     0.32 feet Low Tide
Fri -- 09:26 AM CDT     Moonrise
Fri -- 03:37 PM CDT     0.42 feet High Tide
Fri -- 07:22 PM CDT     Sunset
Fri -- 08:20 PM CDT     0.37 feet Low Tide
Fri -- 09:15 PM CDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.40.40.40.40.40.40.30.30.30.30.30.40.40.40.40.40.40.40.40.40.40.40.4

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 Corpus Christi, 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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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.