Monday, January18, 2021
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Marine Weather and Tides
Port Lavaca, TX

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:20AMSunset 5:56PM Monday January 18, 2021 8:00 AM CST (14:00 UTC) Moonrise 11:06AMMoonset 11:20PM Illumination 26% 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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GMZ330 Matagorda Bay- 341 Am Cst Mon Jan 18 2021
Today..Southeast winds 5 to 10 knots becoming south 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon.
Tonight..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers late.
Tuesday..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers.
Tuesday night..East winds 5 to 10 knots becoming northeast after midnight. Bay waters smooth. A chance of showers.
Wednesday..Northeast winds 10 to 15 knots becoming east in the afternoon. Bay waters slightly choppy becoming smooth to slightly choppy in the afternoon. A chance of showers. Patchy fog in the late morning and afternoon.
Wednesday night..Southeast winds around 10 knots becoming south after midnight. Bay waters smooth to slightly choppy. Patchy fog. A slight chance of showers in the evening. A chance of showers after midnight, then a slight chance of showers late.
Thursday..South winds 10 to 15 knots. Bay waters slightly choppy. Patchy fog. A slight chance of showers.
Thursday night..South winds around 10 knots. Bay waters smooth to slightly choppy. Patchy fog. A slight chance of showers late.
Friday..South winds 5 to 10 knots. Bay waters smooth. Patchy fog. A slight chance of showers.
Friday night..South winds 5 to 10 knots becoming east after midnight. Bay waters smooth. A slight chance of showers late.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 341 Am Cst Mon Jan 18 2021
Synopsis for high island to matagorda ship channel out 60 nm.. Onshore flow will strengthen today and Tuesday as high pressure moves off to the east. Seas will be gradually increasing with this strengthening flow. SEa fog could develop as early as Tuesday night though more likely during the afternoon Wednesday and may linger off and on for the remainder of the week and on into the weekend.


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 181142 AFDCRP

Area Forecast Discussion National Weather Service Corpus Christi TX 542 AM CST Mon Jan 18 2021

AVIATION.

Clouds are spreading north across S TX this morning with a mix of IFR and MVFR CIGs. Patchy fog will also lead to MVFR/IFR visibility, especially for LRD and ALI. Clouds are expected to lift by mid to late morning with VFR conditions through the remainder of the day. Clouds with CIGs at MVFR/IFR levels will redevelop overnight. Southerly winds may gust up to 25 knots this afternoon, then diminish in the evening. Fog is not expected tonight due to slightly elevated winds.

PREV DISCUSSION. /Issued 358 AM CST Mon Jan 18 2021/

SHORT TERM (Today through Tuesday) .

A weak upper level ridge will slide east across S TX today while an upper level long wave trough sags southeast across the southwestern U.S. Southerly winds will strengthen across the CWA through the afternoon in response to deepening surface low across W TX. The ridge aloft and the strengthening southerly winds will lead to partly cloudy skies, breezy winds and very warm temperatures across S TX this afternoon.

The southerly flow will also usher limited moisture across the Coastal Bend and gulf waters. Kept pops less than 20 percent and for now kept the mention of precip out of today's forecast. However, can not rule out a few weak showers moving northward across the Middle Texas Coastal Waters.

Increasing clouds and more humid warm conditions are expected tonight as the moisture continues to deepen. Am not expecting fog tonight due to cloud cover and elevated surface winds.

Tuesday will be another unseasonably warm day with breezy southerly winds under mostly cloudy skies. Rain chances increase through Tuesday afternoon, as a short wave aloft moves across the region and combines with deeper moisture (PWATs around 1.2 inches). The best chance will be across the northwest CWA due to a weak cold front moving across the Hill Country and an inverted trough developing across the western CWA. This will increase low level convergence across the northern Brush Country and northern Rio Grande Plains. This area will also have a better chance of TSRAs, but mostly showers are anticipated due to warm mid levels creating a capping inversion.

LONG TERM (Tuesday Night through Sunday) .

The long term forecast will begin with PWATs around 1.5 to 1.6 inches, which is above normal. A cold front will approach from the north Wednesday, though some question still remains on how far south and how strong this front will be. The GFS/ECMWF wash the front out as it moves approaches the area, but the CMC/NAM keep the front together as it pushes quickly through by Wednesday night. The NAM generally handles these shallow cold fronts a bit better than the global models so the forecast does lean a bit towards this. Though the upper level forcing is weak, with abundant moisture and warm air advection over the cold front isolated to scattered convection is expected Tuesday night through Wednesday night, with the potential for a rumble of thunder across the Brush Country Tuesday night. Winds will briefly shift to the north before shifting back to onshore flow, keeping PWATs higher than normal through the long term period. This could contribute to isolated showers along the coast through Friday. Models hint at another cold front approaching South Texas early next week, though timing is still uncertain.

Temperatures will be mild Wednesday, then increase into the 70s and even lower 80s. Lows will be in the 50s and 60s.

MARINE .

A weak onshore flow this morning will increase to moderate levels through the day as a surface low deepens over West Texas. Winds across the offshore waters are expected to become strong with advisory conditions developing by early this afternoon. A moderate onshore flow can be expected tonight through Tuesday. Increasing moisture will contribute to isolated to scattered showers Tuesday.

Weak to moderate flow is expected through the week, with Small Craft Exercise Caution conditions possible at times Wednesday through Friday. Isolated to scattered showers are possible Tuesday night through Wednesday night as a cold front moves through the area. An isolated thunderstorm is also possible Tuesday night. Isolated showers will remain possible through Thursday night. Rain chances will increase Saturday through early next week as another cold front approaches.

PRELIMINARY POINT TEMPS/POPS. Corpus Christi 74 63 75 58 67 / 10 10 30 60 50 Victoria 73 61 74 55 64 / 10 20 40 40 50 Laredo 79 64 77 55 59 / 0 10 60 80 60 Alice 78 62 79 58 66 / 10 10 40 70 60 Rockport 71 61 74 58 66 / 10 10 30 50 50 Cotulla 79 62 76 54 58 / 0 10 80 80 60 Kingsville 77 63 77 59 67 / 10 10 40 60 60 Navy Corpus 70 64 71 60 66 / 10 10 30 50 50

CRP WATCHES/WARNINGS/ADVISORIES. TX . None. GM . Small Craft Advisory from noon today to 3 AM CST Tuesday For the following zones: Waters from Baffin Bay to Port Aransas from 20 to 60 NM . Waters from Port Aransas to Matagorda Ship Channel from 20 to 60 NM.



TE/81 . AVIATION


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
VCAT2 0 mi42 min ESE 8 G 8.9 54°F 54°F1018 hPa
SDRT2 - 8773037 - Seadrift, TX 17 mi42 min E 6 G 7 57°F 56°F1018.4 hPa
PCNT2 - 8773701 - Matagorda Bay; Port O'Connor, TX 17 mi42 min ESE 7 G 7 57°F 58°F1018.1 hPa
MBET2 21 mi42 min SSE 8.9 G 9.9 60°F 1017.1 hPa
AWRT2 30 mi42 min ESE 5.1 G 6 58°F 54°F1017.5 hPa
EMAT2 37 mi42 min E 5.1 G 7 54°F 55°F1018.3 hPa
MAXT2 - Mission-Aransas Reserve, TX 42 mi60 min ESE 2.9 57°F 1019 hPa (+0.0)56°F
RCPT2 - 8774770 - Rockport, TX 49 mi42 min SE 5.1 G 5.1 57°F 56°F1018.6 hPa

Wind History for Seadrift, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Lavaca - Calhoun County Airport, TX4 mi65 minESE 510.00 miMostly Cloudy54°F50°F86%1018.3 hPa
Palacios Municipal Airport, TX19 mi68 minESE 710.00 miFair51°F49°F92%1018.6 hPa
Victoria, Victoria Regional Airport, TX23 mi69 minESE 610.00 miA Few Clouds45°F42°F90%1018 hPa

Link to 5 minute data for KPKV

Wind History from PKV (wind in knots)
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Tide / Current Tables for Port Lavaca, Matagorda Bay, Texas
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Port Lavaca
Click for Map
Mon -- 02:45 AM CST     0.33 feet High Tide
Mon -- 07:19 AM CST     Sunrise
Mon -- 11:05 AM CST     Moonrise
Mon -- 05:54 PM CST     Sunset
Mon -- 06:04 PM CST     -0.12 feet Low Tide
Mon -- 11:19 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Port O'Connor, Matagorda Bay, Texas
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Port O'Connor
Click for Map
Mon -- 01:05 AM CST     0.20 feet High Tide
Mon -- 07:18 AM CST     Sunrise
Mon -- 11:04 AM CST     Moonrise
Mon -- 03:18 PM CST     -0.24 feet Low Tide
Mon -- 05:53 PM CST     Sunset
Mon -- 11:18 PM CST     Moonset
Mon -- 11:49 PM CST     0.12 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Weather Map
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wmap_A
GEOS Local Image of    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.
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Ground Weather Radar Station



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 numerous 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.