Sunday, May20, 2018 L-36.com


Marine Weather and Tides
Bolivar Peninsula, TX

Version 3.4
What's New / NOTES
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.
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.

Sunrise 6:22AMSunset 8:09PM Sunday May 20, 2018 9:09 AM CDT (14:09 UTC) Moonrise 10:35AMMoonset 12:00AM Illumination 31% 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
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GMZ335 Matagorda Bay-galveston Bay- 328 Am Cdt Sun May 20 2018
Today..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms.
Tonight..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..East winds 5 to 10 knots becoming southeast in the afternoon. Bay waters smooth. A slight chance of showers and Thunderstorms.
Monday night..South 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..South winds 5 to 10 knots. Bay waters smooth.
Wednesday..Southeast winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms.
Wednesday night..Southeast winds 5 to 10 knots becoming south after midnight. Bay waters smooth.
Thursday..Southwest winds around 5 knots becoming southeast in the afternoon. Bay waters smooth. A slight chance of showers and Thunderstorms.
Thursday 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 328 Am Cdt Sun May 20 2018
Synopsis for high island to matagorda ship channel out 60 nm.. Moderate onshore winds will continue early this morning, so small craft should exercise caution this morning. Southeast winds will gradually diminish later today and tonight as high pressure settles into east texas. Light winds are expected most of the upcoming week.

7 Day Forecast for Marine Location Near Bolivar Peninsula CDP, TX
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location: 29.49, -94.56     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 201130
afdhgx
area forecast discussion
national weather service houston galveston tx
630 am cdt Sun may 20 2018

Discussion
12z aviation... Isolated showers are occurring near the coast this
morning. Expect these to continue for the next couple of hours...

moving nw. The main issue for today is an area of thunderstorms
that is expected to form around mid-day NW of cll on an outflow
boundary. This area or cluster of storms is expected to move E se
into southeast texas near cll around 20z and then continue to move
e SE likely affecting uts and then possibly reaching cxo and or
iah in the 22z-02z window. Expect weakening of the storms by early
eve, so for now, will have vcts at iah and southward as storms
may dissipate before they make it that far to the S se. 33

Prev discussion issued 405 am cdt Sun may 20 2018
discussion...

at 330 am, radar is showing some action for a change and showers
are streaming in from matagorda bay into jackson county.

Additional streamer showers will be possible this morning but more
robust activity is expected late this afternoon. A weak short
wave rotating around a long wave trough near ca will move into the
area this afternoon and produce scattered shra tsra. A
southeastward moving outflow boundary over north texas will move
toward the region this afternoon and also bring scattered
shra tsra. The two individual areas of storms look like they will
phase into one complex over the brazos valley late this afternoon.

Jet dynamics remain favorable with a splitting 300 mb jet
structure. Forecast soundings show pw values reaching 1.90 inches
near kcll with CAPE values above 3000 j kg, steep lapse rates and
inverted v signature. SPC has outlooked part of the area in
marginal risk for severe storms later today. Some of the stronger
storms will have the potential to produce large hail and gusty
winds. Will mention severe in the weather grids for the NW zones
for late this afternoon and this evening. The storms will weaken
by mid evening as they move e-se and will likely diminish before
reaching rainfall starved coastal areas. Temperatures today will
trend cooler today primarily due to more cloud cover and cooler
850 temps as the upper ridge retreats slightly. Houston has had 8
consecutive days with 90 degree temps and will forecast a high of
90 degrees today. Precipitation should end around 03z with the
loss of heating and the exit of the short wave but clouds will
linger for a good part of the night.

The upper ridge tries to build back in on Monday but 500 mb
heights look low enough for daytime heating and the sea breeze to
generate isolated to scattered shra tsra. Pw values remain between
1.5-1.6 inches and convective temperatures are in the upper 80's
which looks more than obtainable. Tuesday looks drier and the
sounding profiles reveal very dry air above 850 mb. Coverage
should be less but models show a weak short wave moving into the
area so will maintain a slight chance of precipitation.

500 mb heights climb back to 588 dm by Wednesday night as the
upper ridge amplifies and builds back over texas. Heights begin to
fall on Thursday and Friday as a weakness over the gulf deepens
and shifts slowly west. How close this features get will
eventually determine rain chances for the end of the week. This
time, the eastern half of the CWA is favored for rainfall as pw
values climb to 1.7-1.8 inches and heights fall. The ECMWF is
stronger with the upper trough over the gulf and leaned toward
this solution. Ultimately the deepening trough will allow the
ridge over northern mexico to expand over texas bringing very warm
temperatures back to the area for the memorial day holiday. 43
marine...

seeing scec conditions offshore tonight as depicted by buoy 19.

Expect winds to gradually diminish later today and will back to
the east on Monday as weak high pressure becomes positioned over
la ark. Light winds will persist through the week with a weak
pressure gradient in place. Expect winds to become variable around
mid-week with a sfc ridge axis overhead, and then become S SW late
in the week in response to deepening low pressure across west
texas. 33

Preliminary point temps pops
College station (cll) 89 71 90 69 91 50 30 20 10 20
houston (iah) 90 73 91 72 92 30 30 20 10 20
galveston (gls) 85 78 86 77 86 20 20 20 10 20

Hgx watches warnings advisories
Tx... None.

Gm... Small craft should exercise caution until 8 am cdt this morning
for the following zones: coastal waters from freeport to
matagorda ship channel tx out 20 nm... Coastal waters from
high island to freeport tx out 20 nm... Waters from freeport
to matagorda ship channel tx from 20 to 60 nm... Waters from
high island to freeport tx from 20 to 60 nm.

Discussion... 33
aviation marine... 43


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RLOT2 - 8770971 - Rollover Pass, TX 3 mi51 min SSE 8.9 G 12 81°F 81°F1016.5 hPa
HIST2 12 mi57 min SSE 2.9 G 5.1 80°F 83°F1016.6 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 13 mi57 min SE 11 G 13 80°F 79°F1015.8 hPa
GTOT2 17 mi51 min SSE 6 G 12 81°F 85°F1016.1 hPa
EPTT2 - 8771013 - Eagle Point, TX 19 mi51 min SSE 12 G 14 80°F 82°F1016.2 hPa
KXIH 22 mi34 min SE 15 82°F 73°F
GRRT2 22 mi51 min SE 11 G 15 80°F 82°F1016.1 hPa
MGPT2 - 8770613 - Morgans Point, TX 26 mi51 min SE 9.9 G 14 81°F 83°F1016.2 hPa
SRST2 - Sabine Pass, TX 31 mi69 min SSE 8.9 G 12 80°F 1016.9 hPa (+1.2)
42043 - GA-252 TABS B 39 mi129 min 12 G 14 77°F 80°F1015.7 hPa (+1.5)
SBPT2 - 8770570 - Sabine Pass North, TX 40 mi57 min SE 11 G 14 82°F 85°F1018 hPa
TXPT2 40 mi51 min SSE 13 G 15 80°F 82°F1015.8 hPa
NCHT2 - 8770777 - Manchester, TX 41 mi51 min SE 5.1 G 8 81°F 81°F1015.6 hPa
LUIT2 41 mi51 min ESE 8.9 G 12 79°F 1016.3 hPa
PORT2 - 8770475 - Port Arthur, TX 42 mi51 min SE 7 G 11 81°F 83°F1016.5 hPa
KVBS 49 mi34 min 6 G 14 82°F 73°F

Wind History for Rollover Pass, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galveston, Scholes Field, TX22 mi77 minSE 1010.00 miPartly Cloudy81°F77°F88%1016.3 hPa
High Island 179A (Apache Corp), LA22 mi74 minSE 1410.00 miFair82°F73°F74%1016.3 hPa

Wind History from GLS (wind in knots)
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Last 24hrS15S15S13S12S14SE12SE12SE12SE13SE11SE11SE11SE11SE13SE13SE11SE12SE9SE8SE8SE8SE8SE10SE11
1 day agoS13S14SW15S15S13S15S15S14S14S13S9S9S8SE9SE10S10S11S12S12S12S12S13S15S14
2 days agoW8
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SW9S11S10S14S14SW12S13S16S13S13SW12SW11SW14SW10SW8SW10SW7S8S8S9SW6SW10S11

Tide / Current Tables for Rollover Pass, Texas
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Rollover Pass
Click for Map
Sun -- 12:34 AM CDT     Moonset
Sun -- 05:25 AM CDT     0.33 feet Low Tide
Sun -- 06:22 AM CDT     Sunrise
Sun -- 11:35 AM CDT     Moonrise
Sun -- 03:41 PM CDT     1.52 feet High Tide
Sun -- 08:06 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.80.60.50.40.30.30.40.50.70.91.11.31.41.51.51.51.51.51.41.31.31.31.2

Tide / Current Tables for Galveston Bay Entrance, Texas Current
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Galveston Bay Entrance
Click for Map
Sun -- 12:35 AM CDT     Moonset
Sun -- 01:11 AM CDT     -2.82 knots Max Ebb
Sun -- 06:12 AM CDT     0.00 knots Slack
Sun -- 06:23 AM CDT     Sunrise
Sun -- 09:53 AM CDT     2.44 knots Max Flood
Sun -- 11:36 AM CDT     Moonrise
Sun -- 04:23 PM CDT     -0.00 knots Slack
Sun -- 08:07 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.7-2.8-2.8-2.4-1.8-1-0.20.71.62.32.42.321.61.10.60.1-0.2-0.5-0.7-0.8-0.8-1.1-1.5

Weather Map and Satellite Images
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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 (10,2,3,4)
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Ground Weather Radar Station Houston/Galveston, 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.