Tuesday, May21, 2019 L-36.com


Marine Weather and Tides
Clear Lake Shores, TX

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:23AMSunset 8:10PM Tuesday May 21, 2019 2:18 AM CDT (07:18 UTC) Moonrise 10:02PMMoonset 7:44AM 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- 838 Pm Cdt Mon May 20 2019
.small craft advisory in effect through Tuesday evening...
Rest of tonight..Southeast winds 15 to 25 knots with gusts to around 30 knots. Bay waters rough.
Tuesday..South winds 15 to 20 knots. Bay waters choppy. A slight chance of showers late in the morning. A slight chance of showers and Thunderstorms late in the afternoon.
Tuesday night..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms early in the evening.
Wednesday..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Wednesday night..Southeast winds 15 to 20 knots. Bay waters choppy.
Thursday..Southeast winds 15 to 20 knots. Bay waters choppy.
Thursday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Friday..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Friday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Saturday..Southeast winds around 10 knots. Bay waters smooth to slightly choppy.
Saturday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 838 Pm Cdt Mon May 20 2019
Synopsis for high island to matagorda ship channel out 60 nm.. Deep low pressure over the big bend region of texas will foster strong onshore winds tonight. A moderate to strong onshore flow will persist through mid week as the low moves toward the western high plains.


7 Day Forecast for Marine Location Near Clear Lake Shores, TX
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location: 29.55, -95     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 210441
afdhgx
area forecast discussion
national weather service houston galveston tx
1141 pm cdt Mon may 20 2019

Update
Expanded the wind advisory to the coastal areas overnight
tonight early Tuesday through late afternoon. Coastal flood warning
extended to 6 pm to account for the later high tide times in the
bays and eastern areas.

45

Prev discussion issued 1139 pm cdt Mon may 20 2019
aviation...

a mix of MVFR?vfr ceilings will persist overnight with the
predominant ceilings remaining MVFR as low level moisture
continues to stream into the region beneath a strong cap. Could
get some streamer showers late tonight into early Tuesday as
moisture gets pulled northward. A weak surface trough will
approach the region on Tuesday. This feature will likely trigger a
line of shra tsra with the best chance for thunder north of i-10.

Jet dynamics look a bit better than progged earlier this evening
and fcst soundings show more instability and less capping. Showers
will linger through 00-03 before ending. MVFR ceilings expected
to redevelop Tuesday night in the wake of the precip. The pressure
gradient remains very tight as deep low pressure over SW tx moves
into the western plains. As a result, winds will remain strong
tonight into Tuesday. 43
prev discussion... Issued 747 pm cdt Mon may 20 2019
update...

persistent southeast to south winds on tap tonight and will still
be breezy much of the night in the west and southern areas. As the
upper trough approaches expect the winds to shift to a more
southerly direction and then get strong and gusty again Tuesday
morning as the entrance region of the LLJ lifts out.

Given the winds have issued a coastal flood advisory for the areas
around matagorda bay and the bay side of matagorda and brazoria
counties. For the remainder of coastal areas... Barrier island and
areas around galveston bay have gone to a coastal flood warning.

High tide times tonight between midnight and noon should peak the
highest at 3.5 to 4.2 feet which is going to impact sh 87 near
high island, blue water highway stretch, beach drive in surfside
and toddville road and may reach some of the roads in jamaica
beach. Improving conditions after noon but may need it again for
the big high tide cycle Wednesday morning. Swimming in the gulf
could be hazardous given the strong to very strong rip currents!
gale watch has been dropped and a gale warning has been issued for
the southwestern gulf waters of the upper texas coast. Gusts of
gale driving this issuance especially during the midnight to 9 am
window. SCA remains in effect elsewhere.

Rain chances tonight look minimal but have increased rain chances
over the southern areas Tuesday morning for very fast moving
streamer showers beneath the stout capping inversion.

Last but not least will probably be issuing a wind advisory for
the 6 am to noon window with sustained winds of 15 to 25 knots and
gusts of 27 to 37 mph.

Oh yeah we started the 'tropical' weather season a little early
too. Subtropical storm andrea has formed and should be primarily a
fish storm and some slight impacts for bermuda.

45 43
prev discussion... Issued 347 pm cdt Mon may 20 2019
discussion...

- strong southerly winds expected tonight into Tuesday resulting
in rough marine conditions, elevated tides for coastal flooding
especially along gulf facing beaches, and rip currents. A gale
warning may be needed tonight.

- capping will be an issue as a line of storms moves into the
area. Storms will likely be weakening and probably more likely a
line of showers with a few thunderstorms. This line should slide
to the north and east throughout the day.

Near term [through tonight]...

strong upper level low over the southern rockies should should
move into the plains tonight into Tuesday morning with a negative
tilt. Airmass is quite moist and unstable over SE texas tonight
going into tomorrow but there is little to no lift for storms to
initiate. 18z sounding from tamu college station showed no cap
while amdar soundings over houston showed slight capping. They key
here being the fact that there is just no lift for storms this
afternoon and day time heating will not be enough to get a storm
to develop. So for the rest of the night look for a rain free
forecast with humid and windy conditions. This means low
temperatures in the mid upper 70s.

Short term [Tuesday through Wednesday night]...

href and WRF model runs show some resemblance of a squall line
coming into the area. We will need to maintain some higher end
rain chances because it does look like this line moves into the
area however it will be weakening as it does. Areas to the north
and west of houston have the best chances of storms from late
morning through the early afternoon. The line then falls apart and
shifts east through the afternoon so there should not be too much
activity by the evening hours. SPC maintains a marginal risk of
severe which looks reasonable although all the forcing and lift
will be well north of the area. Possible to get a damaging wind
gusts as storms decay but overall think the severe threat should
be north of the area.

Long term [Thursday through Monday]...

upper level ridging builds over the northern gulf coast and
southeastern states by Thursday morning with deep southerly flow.

Pressure gradient increases over the area so expect more strong
winds for the marine areas and elevated tides. Thursday we might
get a slightly better chance of showers and an isolated storm as a
piece of vorticity rotates around the ridge and allows for enough
lift to squeeze out a storm. Best chance of an isolated storm
looks to the west and southwest of houston. Overall not too
confidence in getting something as the ridge looks pretty strong.

Upper level ridge continues to build over the northern gulf over
the weekend into early next week. Forecast will maintain low
thunderstorm chances if any at all and above normal temperatures.

Overpeck
marine...

winds starting to pick up over the coastal waters this afternoon but
are remaining in scec criteria at this time. Models are keeping with
strengthening winds and seas this evening overnight as the
gradient over the state tightens. Sustained onshore winds should
increase to 20-25 knots with gusts to gale force possible from
overnight through early tues morning. Will leave the gale watch in
place for now (for all of the coastal waters) as there is still
uncertainty with where the low level jet will be strongest.

However, the developing strong gusty SE flow will be enough for
seas to build to 6 to 8 feet nearshore and 8 to 10 feet offshore.

Additionally, this persistent long duration onshore fetch will
help to keep coastal water levels elevated through much of the
rest of the week. Issues with coastal flooding should be
periodic... Mainly during times of high tide, when water levels
could range from 3.5-4.0 feet above mllw. These levels will put
water along the low lying streets of the west end of galveston
island and may impact the ferry service between galveston island
and the west end of the bolivar peninsula. Levels near 4 feet
will also push galveston bay water onto such eastern harris county
roads as toddville road in seabrook, and lower sections of red
bluff road between bay area blvd and highway 146. At 4 feet above
mllw roads near along the western shores of chambers county will
also be impacted. Beaches from san luis to surfside can expect
significant wave run up with sections of beach drive and the blue
water highway going under water during high tide times. Swimming
conditions will also remain dangerous as rip currents stay strong.

41

Preliminary point temps pops
College station (cll) 75 85 74 90 74 10 60 10 10 10
houston (iah) 77 88 77 89 76 10 30 20 10 10
galveston (gls) 78 84 79 84 78 10 20 10 10 10

Hgx watches warnings advisories
Tx... Coastal flood warning until 6 pm cdt Tuesday for the following
zones: brazoria islands... Chambers... Coastal galveston...

coastal harris... Galveston island and bolivar peninsula...

matagorda islands.

Wind advisory until 6 pm cdt Tuesday for the following zones:
chambers... Coastal brazoria... Coastal galveston... Coastal
harris... Coastal jackson... Coastal matagorda... Galveston
island and bolivar peninsula... Matagorda islands.

Wind advisory from 6 am to 6 pm cdt Tuesday for the following
zones: austin... Brazos... Burleson... Colorado... Fort bend...

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

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

madison... Montgomery... Walker... Waller... Washington...

wharton.

Coastal flood advisory until 6 pm cdt Tuesday for the following
zones: coastal brazoria... Coastal jackson... Coastal
matagorda.

Coastal flood advisory until midnight cdt tonight for the
following zones: brazoria islands... Galveston island and
bolivar peninsula... Matagorda islands.

Coastal flood advisory from 6 pm Tuesday to 1 pm cdt Thursday
for the following zones: brazoria islands... Galveston
island and bolivar peninsula... Matagorda islands.

Gm... Small craft advisory until 1 pm cdt Thursday for the following
zones: coastal waters from high island to freeport tx out
20 nm... Matagorda bay... Waters from high island to freeport
tx from 20 to 60 nm.

Small craft advisory until 7 pm cdt Tuesday for the following
zones: galveston bay.

Small craft should exercise caution from Tuesday evening through
Thursday afternoon for the following zones: galveston bay.

Small craft advisory from 9 am Tuesday to 1 pm cdt Thursday for
the following zones: coastal waters from freeport to
matagorda ship channel tx out 20 nm... Waters from freeport
to matagorda ship channel tx from 20 to 60 nm.

Gale warning until 9 am cdt Tuesday for the following zones:
coastal waters from freeport to matagorda ship channel tx
out 20 nm... Waters from freeport to matagorda ship channel
tx from 20 to 60 nm.

Discussion... 45


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 6 mi36 min S 22 G 29 79°F 81°F1005.2 hPa
MGPT2 - 8770613 - Morgans Point, TX 9 mi36 min SSE 11 G 19 80°F 81°F1006.2 hPa
GRRT2 18 mi36 min S 17 G 24 79°F 82°F1005.1 hPa
NCHT2 - 8770777 - Manchester, TX 19 mi36 min S 13 G 19 80°F 80°F1004.7 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 20 mi36 min S 29 G 35 83°F 81°F1005.3 hPa
GTOT2 20 mi36 min SSE 11 G 20 79°F 81°F1005.9 hPa
RLOT2 - 8770971 - Rollover Pass, TX 26 mi36 min S 24 G 30 79°F 81°F1006.5 hPa
HIST2 32 mi36 min SSE 13 G 19 79°F 81°F1006.1 hPa
LUIT2 33 mi30 min SSE 19 G 27 79°F 83°F1005.4 hPa
KXIH 36 mi23 min S 30 79°F 75°F
42035 - GALVESTON 22NM East of Galveston, TX 38 mi28 min SSE 23 G 33 79°F 79°F7 ft1007.1 hPa78°F
42043 - GA-252 TABS B 40 mi138 min SSE 19 G 23 79°F1006.8 hPa (-0.8)
FCGT2 - 8772447 - USCG Freeport, TX 45 mi36 min SSE 25 G 30 80°F 82°F1005.7 hPa
FPST2 45 mi30 min SE 25 G 31 79°F 81°F1004.6 hPa

Wind History for Eagle Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX10 mi88 minSSE 17 G 228.00 miMostly Cloudy81°F71°F74%0 hPa
Houston, Pearland Regional Airport, TX13 mi25 minSSE 12 G 229.00 miOvercast79°F73°F82%1005.6 hPa
Houston, Houston Hobby Airport, TX16 mi25 minSSE 16 G 2710.00 miMostly Cloudy80°F72°F76%1005.2 hPa
Galveston, Scholes Field, TX21 mi26 minSSE 23 G 329.00 miOvercast and Windy79°F73°F85%1006.1 hPa
John Dunn Helistop, TX24 mi23 minVar 7 G 128.00 miOvercast79°F73°F84%1004.7 hPa

Wind History from EFD (wind in knots)
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1 day agoS10--S6--S4SE8S10S10S11S8SE7S10SE10S10S9--SE10SE10SE9SE8E8SE8SE6S9
2 days agoSE8SE8SE9SE8SE8SE11SE13SE11SE11SE12SE12
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SE13--SE10SE10SE12S12S13S11

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Tue -- 06:24 AM CDT     Sunrise
Tue -- 06:39 AM CDT     -0.35 feet Low Tide
Tue -- 08:44 AM CDT     Moonset
Tue -- 03:13 PM CDT     0.85 feet High Tide
Tue -- 08:09 PM CDT     Sunset
Tue -- 09:48 PM CDT     0.67 feet Low Tide
Tue -- 10:18 PM CDT     0.67 feet High Tide
Tue -- 11:02 PM CDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.30.1-0.1-0.2-0.3-0.3-0.3-0.10.10.30.60.70.80.90.80.80.80.70.70.70.70.7

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Tue -- 03:33 AM CDT     0.00 knots Slack
Tue -- 06:23 AM CDT     Sunrise
Tue -- 07:11 AM CDT     2.28 knots Max Flood
Tue -- 08:43 AM CDT     Moonset
Tue -- 02:19 PM CDT     -0.00 knots Slack
Tue -- 08:07 PM CDT     Sunset
Tue -- 11:00 PM CDT     Moonrise
Tue -- 11:36 PM CDT     -2.18 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-2.2-1.8-1.2-0.50.41.322.32.21.81.410.60.40.1-0.2-0.4-0.5-0.6-0.8-1.2-1.6-1.9-2.1

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 (3,6,7,8)
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Ground Weather Radar Station Houston/Galveston, TX
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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.