Tuesday, April25, 2017 L-36.com


Marine Weather and Tides
San Leon, TX

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:40AMSunset 7:54PM Tuesday April 25, 2017 7:37 AM CDT (12:37 UTC) Moonrise 5:19AMMoonset 6:12PM Illumination 0% Phase: New Moon; Moon at 29 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 Galveston Bay- 356 Am Cdt Tue Apr 25 2017
.small craft should exercise caution...
Today..South winds 15 to 20 knots. Bay waters choppy.
Tonight..South winds 15 to 20 knots. Bay waters choppy.
Wednesday..South winds 15 to 20 knots decreasing to 10 to 15 knots in the afternoon. Bay waters choppy becoming slightly choppy in the afternoon. A slight chance of showers. A slight chance of Thunderstorms in the afternoon.
Wednesday night..Northwest winds 5 to 10 knots becoming north 10 to 15 knots after midnight. Bay waters smooth becoming slightly choppy after midnight. A slight chance of showers and Thunderstorms in the evening.
Thursday..Northeast winds around 10 knots becoming southeast in the afternoon. Bay waters smooth to slightly choppy.
Thursday night..South winds around 10 knots. Bay waters smooth to slightly choppy.
Friday..South winds 10 to 15 knots. Bay waters slightly choppy.
Friday night..South winds 15 to 20 knots. Bay waters choppy.
Saturday..South winds 15 to 20 knots. Bay waters choppy. A slight chance of showers and Thunderstorms.
Saturday night..South winds 15 to 20 knots becoming southwest 10 to 15 knots after midnight. Bay waters choppy becoming slightly choppy 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 356 Am Cdt Tue Apr 25 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Onshore winds will strengthen through Wednesday. A brief period of moderate offshore flow is possible late Wednesday into Thursday as a cold front reaches the waters. Onshore flow is expected to resume late in the week and strengthen as a storm system develops over the southern plains.

7 Day Forecast for Marine Location Near San Leon, TX
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location: 29.48, -94.92     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 251200
afdhgx
area forecast discussion
national weather service houston/galveston tx
700 am cdt Tue apr 25 2017

Aviation
Clouds continue to develop over south texas and the middle coast.

These clouds will work their way north and will begin to impact
area TAF sites with MVFR cigs. Some mixing should allow forVFR
cigs by mid/late aftn before MVFR CIGS redevelop this evening.

Winds will be strong today as deep low pressure moves across north
texas. Winds will gust over 25 knots at times at most TAF sites.

43

Prev discussion /issued 359 am cdt Tue apr 25 2017/
discussion...

early morning surface analysis shows southeast texas situated in
between ridging over the northern gulf and an area of low pressure
centered near the texas/oklahoma panhandles. While another dry
day is expected for the region, southerly winds will become breezy
today around 10-20 mph in response to the low pressure system.

Not currently planning on issuing a wind advisory given the
anticipated strength of the pressure gradient across southeast
texas during the day, but the khgx vad wind profiler is showing
southwest winds 30-35 knots around 1000-2000 feet agl and could
see a few of these gusts reach the surface later this morning. In
addition to breezy conditions, this onshore flow will also
promote warmer temperatures than yesterday with highs in the low
to mid 80s as well as allow gulf moisture (and humid conditions)
to return.

As a shortwave trough over washington on goes-16 6.95 micrometer
water vapor imagery this morning dives towards the southern plains
tonight, the surface low will eject eastward towards
arkansas/missouri ahead of it. Breezy conditions are expected to
continue through the night as the surface pressure gradient
remains elevated in response to this system, with a few warm air
advection type showers possible across parts of the brazos valley
early Wednesday morning. Otherwise, increased moisture and
elevated winds will result in overnight lows only falling into the
low to mid 70s Wednesday morning... Which may endanger a few
record high minimum values.

As the surface low continues eastward on Wednesday ahead of the
associated shortwave trough, it is expected to drag a cold front
across texas and into southeast texas Wednesday afternoon and
evening. Increasing southwest flow in the mid levels at the same
time will result in warming mid-level temperatures/ a
strengthening cap Wednesday morning. A few warm air advection
showers will be possible beneath this cap across most of southeast
texas on Wednesday morning and will need to keep an eye on how
the cap evolves through the day for thunderstorm potential with
the cold front on Wednesday afternoon and evening. Ahead of the
front, afternoon temperatures are expected to range from the mid
80s over the eastern counties to near 90 over the western
counties. Record high maximum temperatures may also be in danger
along the coast on Wednesday afternoon.

Several high resolution models break out a line of thunderstorms
along the cold front as it pushes southeast into eastern texas and
western louisiana, but differ on the southward extent of
thunderstorm development owing to the presence of the cap in
place. Anticipate some mid level cooling to occur during the
afternoon hours as the shortwave trough approaches the region,
which would support the potential for some convective development
within the region. Given the trajectory of this trough and
anticipated timing of the frontal boundary during the afternoon
and evening hours, currently expect areas east of a madisonville/
huntsville/ cleveland line to have the best chances for seeing
development. Should thunderstorms develop (and again, that's still
questionable given the cap), 0-6 km bulk shear values in excess
of 50 knots will promote storm organization with a few possibly
becoming strong and capable of gusty winds or hail with mid-level
lapse rates around 7.5 c/km. Expect the front and any associated
thunderstorms to push east of the region late Wednesday evening,
with temperatures inland falling back into the 50s by Thursday
morning.

The front will have little overall impact on temperatures through
the end of the work week with highs remaining in the mid 80s to
near 90 Thursday and Friday with generally dry conditions
expected. An upper level disturbance now over the northern pacific
is expected to reach texas on Saturday, resulting in surface
cyclogenesis over west texas. As this system ejects northeast over
the weekend, it will drag another cold front across southeast
texas late Saturday night into Sunday, with showers and
thunderstorms developing along the front. Another round of breezy
to windy conditions are expected inland on Saturday ahead of the
front's arrival with thunderstorms along the front capable of at
least locally heavy rainfall as precipitable water values approach
1.8 inches. Drier conditions are expected behind the front on
Sunday.

Huffman
marine...

moderate to occasionally strong onshore winds will persist today
through Wednesday morning as deep low pressure moves across north
texas. Will maintain caution flags for the gulf waters for today
and issue an SCA for the gulf waters tonight through 15z
Wednesday. The winds will briefly decrease Wednesday afternoon as
a cold front nears the coast. The front should cross the coastal
waters between 700 and 1000 pm with high pressure quickly building
into the region in the wake of the front. Winds will also briefly
increase Wednesday night and an scec may be required. The surface
high over tx will move east on Thursday and onshore winds will
return on Thursday. The pressure gradient will tighten
significantly on Friday as low pressure develops over west texas.

A strong onshore flow is expected Saturday and Saturday night and
an SCA will likely be required. A cold front will cross the
coastal waters Sunday morning with an abrupt wind shift to the
north. High pressure will settle over texas Sunday night with
light NE winds on Monday becoming east as the sfc high moves east.

With the long southerly fetch in place across the western gulf
early this week and again late this week, waves across the
offshore waters are expected to build into the 7-11 feet range at
times. This fetch may also result in elevated tides/coastal flood
issues and strong rip currents along gulf facing beaches by late
this week. Tide levels fri/sat could exceed 3 feet early wed
morning and early Friday morning. 43

Preliminary point temps/pops
College station (cll) 85 72 87 52 84 / 0 10 20 10 0
houston (iah) 84 73 87 56 84 / 10 10 30 20 10
galveston (gls) 79 76 83 65 78 / 10 10 20 10 10

Hgx watches/warnings/advisories
Tx... None.

Gm... Small craft advisory from 5 pm this afternoon to 7 am cdt
Wednesday for the following zones: matagorda bay.

Small craft should exercise caution until 5 pm cdt this
afternoon for the following zones: coastal waters from
freeport to the matagorda ship channel out 20 nm... Coastal
waters from high island to freeport out 20 nm... Matagorda
bay... Waters from freeport to the matagorda ship channel
from 20 to 60 nm... Waters from high island to freeport from
20 to 60 nm.

Small craft should exercise caution through Wednesday morning
for the following zones: galveston bay.

Small craft advisory from 5 pm this afternoon to 10 am cdt
Wednesday for the following zones: coastal waters from
freeport to the matagorda ship channel out 20 nm... Coastal
waters from high island to freeport out 20 nm... Waters from
freeport to the matagorda ship channel from 20 to 60 nm...

waters from high island to freeport from 20 to 60 nm.

Discussion... 14
aviation/marine... 43


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 0 mi80 min SSW 13 G 17 72°F 73°F1005.5 hPa
GRRT2 12 mi80 min SSW 14 G 16 72°F 73°F1005.6 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 13 mi80 min S 19 G 22 74°F1005.5 hPa
MGPT2 - 8770613 - Morgans Point, TX 14 mi80 min S 7 G 9.9 70°F 74°F1005.7 hPa
GTOT2 14 mi80 min 72°F 74°F
LYBT2 21 mi80 min S 9.9 G 12 68°F 75°F1004.8 hPa
RLOT2 - 8770971 - Rollover Pass, TX 22 mi80 min S 8.9 G 14 71°F 71°F1006.1 hPa
NCHT2 - 8770777 - Manchester, TX 25 mi80 min S 5.1 G 8 67°F 76°F1005.7 hPa
HIST2 29 mi80 min S 9.9 G 15 71°F 74°F1006.3 hPa
LUIT2 30 mi80 min S 12 G 17 73°F
42035 - GALVESTON 22NM East of Galveston, TX 32 mi108 min S 18 G 21 73°F 75°F4 ft1005.9 hPa (-1.3)63°F
FCGT2 - 8772447 - USCG Freeport, TX 42 mi80 min S 16 G 19 73°F 74°F1006 hPa
SRST2 - Sabine Pass, TX 49 mi98 min S 13 G 16 70°F 1007 hPa (-1.0)60°F

Wind History for Eagle Point, TX
(wind in knots)    EDIT      (on/off)   Help
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N4
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G12
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N12
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N6
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NE4
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W4
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G10
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NE1
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N10
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N13
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N12
G17
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G25
N12
G24

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galveston, Scholes Field, TX15 mi1.8 hrsS 1610.00 miMostly Cloudy73°F64°F74%1006.2 hPa
Houston / Ellington, TX16 mi1.8 hrsSSE 310.00 miA Few Clouds63°F55°F77%1006.4 hPa
Houston, Pearland Regional Airport, TX17 mi1.7 hrsSSE 310.00 miFair66°F59°F78%1005.9 hPa
Houston, Houston Hobby Airport, TX22 mi1.7 hrsSSE 510.00 miA Few Clouds63°F59°F87%1006 hPa

Wind History from GLS (wind in knots)
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Last 24hrNW5N6N645S10SE10S10S8S11S9S11S9S10S12S13S12S15S15S12S13S16S16S15
1 day agoN21
G28
N19N18
G26
N15
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N13N11
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N12N14N14N12N14N13N11N12NE5E3CalmW3W5NW7NW7NW7
2 days agoS7S10S11S11S9S10S13S13N12N12N14N17N19N17
G25
N20N22
G29
N21N22
G28
N21
G27
N18N19
G26
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G31
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G30
N21
G28

Tide / Current Tables for Eagle Point, Galveston Bay, Texas
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Eagle Point
Click for Map
Tue -- 12:37 AM CDT     0.49 feet Low Tide
Tue -- 06:18 AM CDT     Moonrise
Tue -- 06:42 AM CDT     Sunrise
Tue -- 08:06 AM CDT     1.14 feet High Tide
Tue -- 01:36 PM CDT     0.91 feet Low Tide
Tue -- 05:29 PM CDT     1.00 feet High Tide
Tue -- 07:11 PM CDT     Moonset
Tue -- 07:52 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.50.50.60.80.911.11.11.11.110.90.90.90.911110.90.70.60.4

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Tue -- 01:27 AM CDT     0.00 knots Slack
Tue -- 04:21 AM CDT     1.51 knots Max Flood
Tue -- 06:17 AM CDT     Moonrise
Tue -- 06:42 AM CDT     Sunrise
Tue -- 07:43 AM CDT     -0.00 knots Slack
Tue -- 11:16 AM CDT     -0.97 knots Max Ebb
Tue -- 02:33 PM CDT     0.00 knots Slack
Tue -- 04:20 PM CDT     0.54 knots Max Flood
Tue -- 06:08 PM CDT     -0.00 knots Slack
Tue -- 07:11 PM CDT     Moonset
Tue -- 07:51 PM CDT     Sunset
Tue -- 10:16 PM CDT     -1.58 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.30.41.11.51.410.4-0.2-0.6-0.8-1-0.9-0.7-0.30.20.50.50.1-0.5-1-1.4-1.6-1.5

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 Houston/Galveston, TX (8,2,3,4)
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Ground Weather Radar Station Houston/Galveston, 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.