Friday, September21, 2018 L-36.com


Marine Weather and Tides
Port O'Connor, TX

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What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 7:15AMSunset 7:26PM Friday September 21, 2018 6:26 AM CDT (11:26 UTC) Moonrise 4:41PMMoonset 3:03AM Illumination 87% 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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GMZ330 Matagorda Bay- 435 Am Cdt Fri Sep 21 2018
Today..Southeast winds around 10 knots. Bay waters smooth to slightly choppy. A chance of showers and Thunderstorms.
Tonight..Southeast winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms in the evening, then showers and Thunderstorms likely after midnight.
Saturday..South winds around 5 knots. Bay waters smooth. Showers and Thunderstorms likely in the morning, then a chance of showers and Thunderstorms in the afternoon.
Saturday night..South winds 5 to 10 knots becoming west after midnight. Bay waters smooth. Showers and Thunderstorms likely in the evening, then a chance of showers and Thunderstorms after midnight.
Sunday..Northwest winds around 5 knots becoming southwest in the afternoon. Bay waters smooth. Showers and Thunderstorms likely.
Sunday night..South winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Monday..South winds 5 to 10 knots. Bay waters smooth. Showers and Thunderstorms likely in the morning, then a chance of showers and Thunderstorms in the afternoon.
Monday night..South winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Tuesday..South winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Tuesday night..Southeast winds 5 to 10 knots. Bay waters smooth. 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 435 Am Cdt Fri Sep 21 2018
Synopsis for high island to matagorda ship channel out 60 nm.. Light to moderate onshore flow will prevail for the next couple days. Winds should diminish this weekend as the pressure gradient relaxes. Deepening tropical moisture and a series of upper level disturbances will bring increased chances of showers and Thunderstorms to the waters today into early next week.


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 210935
afdhgx
area forecast discussion
national weather service houston galveston tx
435 am cdt Fri sep 21 2018

Discussion
Impulse embedded in the upper trof is currently producing some
-ra across portions of the region this morning. Cloudiness will
delay significant heating early today, but expect sct showers and
tstms do redevelop once we reach the convective temps in the upper
80s later in the day. With deep tropical moisture in place,
localized heavy downpours are possible. Coverage should diminish,
but probably not completely dissipate with the loss of heating
this evening and overnight.

Overall pattern, consisting of a nearby mid & upper trof weakness,
does not change all that much this weekend. A weak frontal boundary
will be sagging into north and central texas and will produce a
focusing mechanism for heavier training precip. There's a wide
variety of model solutions in regards to how far south this
boundary will make it and when. At this time, most currently keep
it north of the forecast area. But as the dayshift noted, this
will more than likely be determined on the mesoscale (cold pool
pushes, etc). So long as it remains to our north, the widespread
threat of flash flooding will be tempered. Keep in mind, however,
that near record high pw's for this time of year (2.2-2.5") will
be pooling over the region, steering flow will be weakening to
<8kt and convective temperatures will fall closer to the 85-87f
range. So even without a well defined trigger or focusing
mechanism, slower moving stronger cells can be efficient
rainmakers. Wpc forecast has an average 1-2" rainfall amounts
today through the weekend, but double+ those amounts can fall in
a short time frame and produce some localized street flooding.

Will keep a close eye on things especially areas that've seen
substantial rainfall in the past few weeks.

Unsettled wx persists into next week with a tropical airmass
remaining in place. Expected fairly good chances of precip each
day... Probably becoming more diurnal in nature (coast at night &
in the morning, afternoon inland). Inverted mid level trof near fl
this morning will be making its way wsw toward the western gulf
coast toward midweek with ridging building in behind it later in
the week. Upper pattern isn't looking quite as favorable for a
late week FROPA as we've been seeing... 47

Marine
Generally light moderate onshore winds will prevail the next several
days (as high pressure lingers to the east and a low pressure system
develops to the west). Wind speeds could reach caution levels brief-
ly over offshore waters tonight. However, over the weekend, the over
all gradient should be relaxing as a weak cold front moves into nor-
thern portions of SE tx. This boundary is not expected to make it to
the coast at this time. With the onshore winds persisting, deepening
tropical moisture along with series of upper level disturbances will
lead to unsettled weather for much of next week. 41

Aviation
Bands of light rain drizzle will continue to move from west to east
across SE tx through the rest of the morning. At this time, not see-
ing much by way of lower CIGS vis, but MVFR conditions will remain a
possibility. Forecast for the rest of today looks wet unsettled with
the approach of a disturbance from the west. Not that confident with
regard to timing of things, so might keep with the general vcsh vcts
wording for this afternoon early evening. Will be expecting most (if
not all) of this activity to decrease tonight. If skies do clear, we
may have to entertain the possibility of patchy fog for overnight or
early Sat morning timeframe. 41

Preliminary point temps pops
College station (cll) 88 74 86 72 85 50 40 60 60 50
houston (iah) 88 75 87 74 87 40 40 70 50 70
galveston (gls) 90 79 87 78 86 30 60 70 50 60

Hgx watches warnings advisories
Tx... None.

Gm... None.

Discussion... 99


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PCNT2 - 8773701 - Matagorda Bay; Port O'Connor, TX 0 mi38 min S 12 G 13 1012.4 hPa
MBET2 4 mi38 min S 12 G 14 84°F 90°F1011.5 hPa
SDRT2 - 8773037 - Seadrift, TX 17 mi38 min SE 8.9 G 11 1012.8 hPa
VCAT2 18 mi38 min SSE 11 G 12 1012.5 hPa
AWRT2 26 mi38 min SSE 9.9 G 13 1012.5 hPa
EMAT2 32 mi38 min SSE 9.9 G 12 84°F 87°F1012.6 hPa
KBBF 38 mi31 min S 15 84°F 77°F
SGNT2 47 mi38 min SSE 9.9 G 14 85°F 87°F1013 hPa

Wind History for Port OConnor, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Lavaca - Calhoun County Airport, TX21 mi56 minSE 510.00 miPartly Cloudy82°F78°F90%1012.9 hPa
Palacios Municipal Airport, TX21 mi93 minSSE 610.00 miA Few Clouds83°F79°F88%1012.8 hPa

Wind History from PKV (wind in knots)
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Last 24hrSE4SE3SE3CalmSE4S5SE9SE10SE8SE10SE11SE6SE8SE5SE6--------SE7SE6SE4SE3SE5
1 day agoCalmCalmCalmCalmS4SE3SE3E7E10E10SE9E9SE10SE6SE5--SE4SE5SE4SE4SE4CalmSE4Calm
2 days agoCalmCalmCalmCalmCalmCalmNE3E5E5E4SE5------S4S4S3CalmCalmSE3CalmCalmCalmCalm

Tide / Current Tables for Port O'Connor, Matagorda Bay, Texas
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Port Lavaca, Lavaca Causeway, Matagorda Bay, Texas
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map and Satellite Images
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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.
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Wind Forecast for Houston/Galveston, TX (7,2,3,4)
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Ground Weather Radar Station Corpus Christi, TX
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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.