Sunday, May20, 2018 L-36.com


Marine Weather and Tides
Port O'Connor, TX

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 6:32AMSunset 8:16PM Sunday May 20, 2018 8:15 PM CDT (01:15 UTC) Moonrise 10:45AMMoonset 12:00AM Illumination 36% Phase: Waxing Crescent; Moon at 6 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
    EDIT      (on/off)   Help
GMZ330 Matagorda Bay- 333 Pm Cdt Sun May 20 2018
Tonight..Southeast winds 10 to 15 knots early becoming east near 15 knots and gusty. Bay waters slightly choppy becoming choppy after midnight. A slight chance of showers.
Monday..Southeast winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms.
Monday night..Southeast winds 5 to 10 knots. Bay waters smooth.
Tuesday..Southeast winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms.
Tuesday night..Southeast winds 5 to 10 knots. Bay waters smooth.
Wednesday..Southeast winds 5 to 10 knots. Bay waters smooth.
Wednesday night..Southeast winds 5 to 10 knots. Bay waters smooth.
Thursday..Southeast winds 5 to 10 knots. Bay waters smooth. A slight chance of showers.
Thursday night..Southeast winds 5 to 10 knots becoming southwest after midnight. Bay waters smooth.
Friday..West winds around 5 knots becoming south in the afternoon. Bay waters smooth. A slight chance of showers and Thunderstorms.
Friday night..South winds 5 to 10 knots becoming southwest after midnight. Bay waters smooth.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 333 Pm Cdt Sun May 20 2018
Synopsis for high island to matagorda ship channel out 60 nm.. Light to moderate onshore winds this afternoon and evening will gradually diminish after midnight as high pressure settles into east texas. A large area of showers and Thunderstorms over southeast texas should shift toward the coast and could push out into the nearshore waters tonight. Gusty winds would accompany the storms. Light winds are expected most of the upcoming week.

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


Area Discussion for - Houston/Galveston, TX
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus64 khgx 210002
afdhgx
area forecast discussion
national weather service houston galveston tx
702 pm cdt Sun may 20 2018

Aviation
Showers and thunderstorms are building southward this evening while
overall motion of precipitation is toward the east. Cll is
beginning to see clearing while uts, cxo, iah are continuing to be
impacted by thunderstorms. An outflow boundary is currently
racing out ahead of the main line of thunderstorms and pushing
through sgr and hou. Winds will be variable with gusty conditions
beneath stronger storms. Anticipating most of the thunderstorm
development to weaken by 03z, with showers lingering into the
early morning hours. The precipitation should clear from the
northwest to southeast. Some patchy fog will also be possible
between 09-15z across our northern TAF sites.

Should see a small break in the way of precipitation for the
coastal sites tomorrow morning. The possibility of shower
development will return at lbx and gls around sunrise. MVFR
ceilings will begin to rise toVFR in the late morning and into
the early afternoon hours. E-se winds will return by the afternoon
between 5-10kts.

Hathaway

Prev discussion issued 404 pm cdt Sun may 20 2018
discussion...

showers and storms will largely be welcome rainfall for much of
the area today. However, there is enough instability that an
isolated strong to marginally severe storm is still possible, and
these strongest storms could create a very localized minor
flooding problem is it dumps enough rainfall quickly enough over a
vulnerable location. Beyond that, we settle into a rather
summer-like pattern for most of the week.

Near term [through tonight]...

for the first time in a while, the radar is lit up with a number
of showers and thunderstorms near and to the northwest of houston.

Ir satellite shows the coldest cloud tops right around -70c,
though most of the area shows warmer tops. As one might expect
given this, rainfall totals have varied wildly from near nothing,
to a maximum gauge total of 2.36 inches north of iah, though
radar estimates imply a cell has dropped roughly three inches in
extreme southwestern montgomery county as well.

The streamer showers and storms that had made up the bulk of the
morning's rainfall has largely merged with a broken line of
thunderstorms following its cold pool's outflow boundary slowly to
the southeast. Mesoanalysis shows 1500 or so j kg of CAPE in the
environment ahead of the line, indicating we still have ample
instability for continued storms. Dcape west of houston is now
over 800 j kg, which implies that our main severe threat is
damaging straight-line winds, though even that is a fairly
marginal threat. In addition, high precipitable water values and
a CAPE profile that this evening will resemble more a heavy rain
look, also means that the strongest cells could generate some
briefly torrential downpours, creating localized flooding issues
in areas of poor drainage and near flashy small streams.

However, bulk shear is pretty weak, and this will inhibit updraft
organization and the ultimate severe and rain threats. The threat
will largely be confined to the most robust updrafts before they
collapse and where cells pass over a site repeatedly.

Additionally, since these storms are largely sustained by
instability alone, we'll see them very slowly wind down into the
nighttime hours once the Sun sets. This will further limit
rainfall potential near the coast, where the forecast doesn't
really have pops above 30 percent. Rainfall here may be fairly low
unless the line can push coastward more effectively in the next
several hours.

Short term [Monday through Tuesday night]...

in many ways, tomorrow looks very similar to today. However,
without the upstream spark of a large convective system, I would
expect rainfall potential to be much more subdued despite similar
midlevel heights and what appears to be another shortwave moving
through. Ditto, really, for Tuesday. We'll definitely have some
things that will help support showers or storms that do develop,
but finding triggers for storms looks to be more difficult. Though
places that have seen plenty of rain today will obviously be
warmer with more isolated convection, temperatures as a whole look
to be pretty stable the next couple of days.

Long term [Wednesday through Sunday]...

we spend the latter half of the week pinned between a building
ridge over western mexico and an upper low over the northern gulf
coast, which keeps us in a situation with potential for isolated
to scattered showers and storms, but lacking in obvious triggers,
keeping convective potential in check. Heights do look to rise,
and so introduce a slow rise in temperatures into the weekend.

Now, the potential wrench in the whole works: it appears the 12z
euro has got a bug in it to bring the upper low lifting out of the
caribbean sea towards louisiana this weekend. This could put an
end to any warming trend, and open us up to higher rain chances,
though i've undercut the guidance as i've leaned a little more to
the gfs, which was a little more like yesterday's forecast.

Now, as for what the euro does next week? I'm not gonna talk about
it. It's beyond the forecast period, I refuse to discuss it. It's
probably going to change before it gets into the forecast period
anyway. And if it doesn't change, then I will discuss it then.

Aviation [18z TAF issuance]...

impressively large area of showers and thunderstorms from del rio
fanning out to near fort worth to houston. Storms have been
getting stronger with the continued destabilization over the area.

Can't rule out strong thunderstorms with winds over 40 knots with
these probably near the cll uts cxo terminals this afternoon.

Expect the deeper cold pool with the large cluster of storms near
tpl-t35 to help steer the development southeastward. Have gone
more pessimistic in area tafs with vcts this afternoon
interspersed with tempo shra tsra through mid evening. Expect the
area of storms to shift southeastward late afternoon evening and
many of the hrrr WRF support this movement development as upper
short wave moves into the area aiding the ventilation. Between
03-08z expect that most precip will wane but a boundary is likely
to be present near the coast around sunrise and anticipate at
least some scattered showers in proximity to the boundary so will
reinstate vcsh near 12z for the coastal sites. After the storms
wane late evening some patchy fog possible in rain cooled areas.

45
marine...

southeast winds 10-15 knots probably getting a little stronger
and gustier tonight as inflow to deep convection shifts close to
the coast with the storms. Storm may spread out into the nearshore
waters this evening before weakening. Boundary remains in the
morning and could be focus for additional showers. Expect lighter
wind regime Monday through Thursday. Will be keeping an eye on the
eastern gulf this week with most models indicating lowering
pressures as upper low meanders about.

45
hydrology...

despite a good amount of rain upstream and some more rains
expected through tonight, widespread hydrology concerns are nil.

Rivers are well below bankfull, and given the recent dry weather,
the rain will largely be beneficial. The potential for isolated
stronger storms and high available atmospheric moisture does mean
some briefly torrential rainfall is possible with the strongest
cells. This could potentially cause very localized minor flooding
issues on flashy small streams.

Preliminary point temps pops
College station (cll) 68 90 70 91 70 60 20 10 20 10
houston (iah) 71 91 72 91 73 90 20 10 20 10
galveston (gls) 78 85 78 85 78 20 20 10 20 0

Hgx watches warnings advisories
Tx... None.

Gm... None.

Discussion... 31
aviation marine... 08


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PCNT2 - 8773701 - Matagorda Bay; Port O'Connor, TX 0 mi46 min ESE 9.9 G 11 80°F 83°F1014.2 hPa
MBET2 4 mi46 min SE 8 G 8.9 80°F 83°F1013.5 hPa
SDRT2 - 8773037 - Seadrift, TX 17 mi46 min ENE 8.9 G 11 82°F 85°F1014.1 hPa
VCAT2 18 mi46 min SE 14 G 15 80°F 84°F1014 hPa
AWRT2 26 mi46 min E 12 G 15 81°F 84°F1013.7 hPa
EMAT2 32 mi46 min SE 7 G 8.9 81°F 84°F1014.2 hPa
KBQX 42 mi21 min ESE 4.1 82°F 75°F
SGNT2 47 mi46 min SE 6 G 8 81°F 84°F1014.3 hPa

Wind History for Port OConnor, TX
(wind in knots)    EDIT      (on/off)   Help
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
Last
24hr
SE20
SE20
SE18
SE18
G22
SE16
SE14
SE17
SE17
SE16
SE16
SE15
SE18
SE17
SE18
SE18
SE12
G16
S13
G16
SE12
SE12
G15
SE11
G16
SE10
SE8
G11
SE9
E12
1 day
ago
SE18
SE18
SE17
SE18
S17
G23
SE19
SE18
S18
G22
SE20
SE17
S17
SE19
SE18
S18
S17
G21
SE16
SE16
SE16
SE16
G21
SE16
SE17
G21
SE17
SE17
G21
SE19
2 days
ago
S16
S17
S15
S15
S16
S16
S16
S17
S12
S12
S11
S13
G16
S15
S17
G21
S17
G21
S16
S13
G16
SE15
G19
S16
SE15
G19
SE17
SE17
SE17
SE16

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Port Lavaca - Calhoun County Airport, TX21 mi21 minE 610.00 miFair80°F72°F78%1014.9 hPa
Palacios Municipal Airport, TX21 mi23 minESE 710.00 miFair81°F75°F82%1014.8 hPa

Wind History from PKV (wind in knots)
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
Last 24hrSE13SE13
G17
SE12
G17
SE11
G15
SE10SE8SE9S6
G17
SE10SE8SE7SE9SE14
G18
SE14SE15
G21
S17
G22
SE16SE16SE13
G17
SE13
G17
SE14
G17
SE11E11E10
1 day agoSE12S7S7SE5S7S8SE5S7SE7SE6SE5SE5S12
G17
S14
G19
S15
G21
S15
G21
S14
G19
SE17
G24
S14
G22
SE15
G21
SE17
G21
SE16
G21
SE15
G20
SE14
2 days agoS7S6S4S4S5S6S5S5S8S4S3CalmCalmS13
G20
S14
G23
S14
G19
S11
G20
S13
G18
S12
G18
SE13
G18
S17
G21
SE15
G20
S13
G20
SE12
G18

Tide / Current Tables for Port O'Connor, Matagorda Bay, Texas
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Port O'Connor
Click for Map
Sun -- 12:40 AM CDT     Moonset
Sun -- 03:40 AM CDT     0.01 feet Low Tide
Sun -- 06:32 AM CDT     Sunrise
Sun -- 11:45 AM CDT     Moonrise
Sun -- 02:56 PM CDT     0.94 feet High Tide
Sun -- 08:12 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.20.1000.10.10.30.40.50.60.70.80.90.90.90.90.90.90.90.80.70.60.5

Tide / Current Tables for Port Lavaca, Lavaca Causeway, Matagorda Bay, Texas
   EDIT      (on/off)   Help   One Week of Data
Port Lavaca
Click for Map
Sun -- 12:41 AM CDT     Moonset
Sun -- 06:32 AM CDT     Sunrise
Sun -- 07:10 AM CDT     0.21 feet Low Tide
Sun -- 11:45 AM CDT     Moonrise
Sun -- 06:01 PM CDT     1.41 feet High Tide
Sun -- 08:13 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.80.70.50.40.30.20.20.20.30.40.60.80.91.11.21.31.41.41.41.41.31.21.1

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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 (21,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Corpus Christi, TX
   (on/off)   Help
weather_mapweather_map weather_map

Gulf Stream Current


Ad by Google

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.