Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Bolivar Peninsula, TX

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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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Sunrise 6:47AMSunset 7:59PM Saturday August 17, 2019 1:15 PM CDT (18:15 UTC) Moonrise 8:32PMMoonset 7:32AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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- 1031 Am Cdt Sat Aug 17 2019
Rest of today..Southwest winds 5 to 10 knots becoming south 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon. A chance of showers and Thunderstorms.
Tonight..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms late.
Sunday..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms.
Sunday night..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms after midnight.
Monday..South winds around 10 knots. Bay waters smooth to slightly choppy. A chance of showers and Thunderstorms.
Monday night..South winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms after midnight.
Tuesday..South winds 5 to 10 knots. Bay waters smooth. A chance of showers and Thunderstorms.
Tuesday night..South winds 5 to 10 knots becoming southwest after midnight. Bay waters smooth. A slight chance of showers and Thunderstorms after midnight.
Wednesday..South winds around 5 knots becoming southeast in the afternoon. Bay waters smooth. A chance of showers and Thunderstorms in the morning, then a slight chance of showers and Thunderstorms in the afternoon.
Wednesday night..South winds 5 to 10 knots. Bay waters smooth. A slight chance of showers and Thunderstorms after midnight.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 1031 Am Cdt Sat Aug 17 2019
Synopsis for high island to matagorda ship channel out 60 nm.. A light to occasionally moderate onshore flow with slightly higher wind speeds during the overnight and early morning hours. Winds may become gusty and erratic near any Thunderstorms that do form. Seas will generally be 2 feet or less today, but will be gradually increasing to around 4 feet late tonight and Sunday. High pressure building into the region through next week will bring more relatively quiet weather.


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


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 171716
afdhgx
area forecast discussion
national weather service houston galveston tx
1216 pm cdt Sat aug 17 2019

Aviation [18z TAF issuance]
Radar is currently showing the development of scattered shra tsra
across areas south of i-10. This activity is expected to continue
to track to the northeast, impacting metro area terminals through
approximately 23z this afternoon.

Expecting some low cloud development to produce brief MVFR CIGS at
cll, uts, and cxo tomorrow morning between 11 to 14z. Conditions
otherwise remain mainlyVFR through the duration of the taf
period. Winds inland remain out of the south at around 8-10kts,
dropping off to around 5kts overnight. Along the coast, winds
remain slightly above 10kts with some gusts possible in the
18-20kt range through the rest of the afternoon and into the
overnight hours.

Cady

Prev discussion issued 1021 am cdt Sat aug 17 2019
update...

surface high pressure remains over the eastern central gulf with
lower pressures over eastern new mexico. 12z crp lch soundings
show 850 temps between 19-20 c which supports high temperatures in
the middle 90's this afternoon but considering the warm start to
to today, will add a few degrees to that which matches values
already in the forecast. Drier air is trying to work into the
western portion of the CWA and the crp and fwd soundings show
quite a bit of dry air above 900 mb. Think there will be some
mixing this afternoon and lowered dew points out west and
subsequently lowered heat index values. Heat advisory looks
marginal out west but still looks valid toward the coast. Will
maintain current advisory as previously configured. Radar is
showing scattered showers and thunderstorms along and east of i-69
this morning. Pw values remain near or just above 2.00 inches over
the eastern third of the region. Convective temperatures are in
the upper 80's so shra tsra should continue to develop with
additional heating and this is supported by hires guidance. Had
some reports yesterday of funnel clouds and waterspouts and
conditions look favorable for this to occur again today. Stay
alert if on the water today. Lastly, bumped wind speeds up a bit
for tonight over the gulf waters and a scec will probably be need
over the western gulf waters tonight. 43
prev discussion issued 420 am cdt Sat aug 17 2019 ...

short term (today through Sunday)...

isolated showers are popping up over coastal waters again early
this morning, but we will head into a lull in activity towards the
late morning. Satellite derived pwat has a surge of pwats of
around 2.1 inches across the region, which is slightly lower than
yesterday. However there is enough moisture that showers and
thunderstorms will pick back up in the afternoon hours. Cam
guidance mostly shows these showers staying on the eastern half of
the cwa, which is where I left the higher pops. Activity settles
down after sunset, but isolated to scattered showers make a return
on Sunday.

Yesterday, heat indices at sugarland got to 110, at galveston to
109, and both houston and huntsville got to 107, with today
looking very similar if not a couple of degrees higher. That,
plus it being the weekend, have decided to put out a heat advisory
beginning at noon and lasting until 7pm. Increased cloud cover
and the increased chances of showers over the eastern counties may
prevent them from hitting criteria (which is 108 or greater), but
with the isolated nature of these showers have decided to just
put the advisory out for the entire area. Heat indicies will again
climb to similar levels on Sunday, but will wait to see how today
goes before we re-issue any future advisories. Fowler
long term (Sunday night through Saturday)...

no change in next week's weather pattern, at least from late
Sunday through Friday. A typical summertime pattern as the
region remains under the influence of desert SW to southern plains
593-ish dam upper ridging. The general mid layer steering flow
will out of the east with periodic lobes of higher moist NW gulf
air (1.9 to 2.1 inch pwat range) traversing southeastern texas. As
these air masses pass through they will increase the occurrence
and areal coverage of showers and thunderstorms, especially if
their arrival is during the afternoon. A near 95 f noon convective
temperature should be achieved each mainly clear to partially
cloudy week day. Due to suppression brought on by the ridge,
background weak southerlies should prevail and allow for the local
mesoscale breezes to become more of a player as it relates to
afternoon convective focus. Low to moderate early day (southern
cwa) streamer showers transitioning to afternoon shower and
isolated storm cluster activity will all be dependent upon sea bay
breeze and outflow interaction behavior.

A general height weakness channel across the western gulf will
support the northern advancement of weak bay of campeche-based
tropical waves that will skirt the coastline from Friday into
Sunday. Model ensembles are all pointing to a general inverted
trough feature but the member consensus is not wanting to close
off anything. So, as of this morning, expect higher coastal and
maritime rain storm chances a week from now... The impetus from a
large scale tropical trough with weak embedded waves within greater
than 2 inch pw air introducing periods of marine and coastal zone
moderate precipitation. Southern third forecast area thicker
overcast and periodic precipitation will regulate weekend warmth
to the 80s. 31
marine...

very similar conditions compared to yesterday for today with
mainly light to occasionally moderate onshore flow with slightly
higher wind speeds during the overnight and early morning hours.

Isolated to scattered showers and thunderstorms are expected in
early morning hours today and tomorrow. Winds may become gusty
and erratic near any thunderstorms that do form. Seas will
generally be 2 feet or less today, but will be gradually
increasing to around 4 feet by tomorrow. There will be marginal
scec conditions due to both wind speeds and seas tonight into
Sunday morning. High pressure building into the region through
next week will bring more relatively quiet weather. Fowler

Preliminary point temps pops
College station (cll) 78 100 78 99 76 10 0 10 20 10
houston (iah) 81 96 81 97 80 10 20 10 60 10
galveston (gls) 85 92 85 93 84 20 20 20 50 30

Hgx watches warnings advisories
Tx... Heat advisory until 7 pm cdt this evening for the following
zones: austin... Brazoria islands... Brazos... Burleson...

chambers... Coastal brazoria... Coastal galveston... Coastal
harris... Coastal jackson... Coastal matagorda... Colorado...

fort bend... Galveston island and bolivar peninsula...

grimes... Houston... Inland brazoria... Inland galveston...

inland harris... Inland jackson... Inland matagorda...

madison... Matagorda islands... Montgomery... Northern
liberty... Polk... San jacinto... Southern liberty... Trinity...

walker... Waller... Washington... Wharton.

Gm... None.

Discussion... 99
aviation marine... 99


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
42035 - GALVESTON 22NM East of Galveston, TX 19 mi25 min S 5.8 G 7.8 87°F 3 ft1014.5 hPa81°F
42043 - GA-252 TABS B 39 mi135 min SSW 9.7 G 12 87°F1013.8 hPa (+1.4)

Wind History for Rollover Pass, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
High Island 179A (Apache Corp), LA22 mi40 minWSW 12 G 1810.00 miPartly Cloudy90°F77°F67%1013.9 hPa
Galveston, Scholes Field, TX22 mi23 minS 1110.00 miPartly Cloudy94°F75°F54%1013.6 hPa

Link to 5 minute data for KGLS

Wind History from GLS (wind in knots)
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Last 24hrSE9SE9--SE11--S11S8--SE8SE11--SE12--S12S10--S11SW11S6--SW8S9S12S12
1 day ago3N6NE5S7--S7----SE5E7E5SE8SE8--------S6--------N5Calm
2 days ago5NW3S11S13S14S12S11SW9NW16
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NE9CalmCalmCalmNW6NW8NW5N6N5N4NE5NE8N6N6--

Tide / Current Tables for Gilchrist, East Bay, Texas
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Gilchrist
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Sat -- 04:01 AM CDT     0.11 feet Low Tide
Sat -- 06:47 AM CDT     Sunrise
Sat -- 08:31 AM CDT     Moonset
Sat -- 10:29 AM CDT     1.15 feet High Tide
Sat -- 04:29 PM CDT     0.85 feet Low Tide
Sat -- 07:56 PM CDT     Sunset
Sat -- 08:37 PM CDT     1.07 feet High Tide
Sat -- 09:31 PM CDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.40.30.10.10.20.30.50.811.11.11.110.90.90.90.90.911.11.110.9

Tide / Current Tables for Galveston Bay Entrance, Texas Current
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Galveston Bay Entrance
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Sat -- 03:36 AM CDT     0.00 knots Slack
Sat -- 06:22 AM CDT     1.53 knots Max Flood
Sat -- 06:48 AM CDT     Sunrise
Sat -- 08:32 AM CDT     Moonset
Sat -- 11:32 AM CDT     -0.00 knots Slack
Sat -- 12:36 PM CDT     -0.11 knots Max Ebb
Sat -- 02:04 PM CDT     0.00 knots Slack
Sat -- 05:21 PM CDT     0.35 knots Max Flood
Sat -- 06:46 PM CDT     -0.00 knots Slack
Sat -- 07:57 PM CDT     Sunset
Sat -- 09:32 PM CDT     Moonrise
Sat -- 11:43 PM CDT     -2.10 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-2.3-1.9-1.2-0.50.31.11.51.51.10.80.50.1-0.1-0.1-00.10.20.30.3-0.1-0.8-1.4-1.8-2

Weather Map and Satellite Images
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Wind Forecast for Houston/Galveston, TX (14,3,4,5)
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Ground Weather Radar Station Houston/Galveston, TX
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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.