Wednesday, January17, 2018 L-36.com


Marine Weather and Tides
Houston, TX

Version 3.4
What's New / NOTES
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.
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.

Sunrise 7:15AMSunset 5:48PM Wednesday January 17, 2018 1:04 AM CST (07:04 UTC) Moonrise 7:37AMMoonset 6:30PM Illumination 0% Phase: New Moon; Moon at 0 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- 913 Pm Cst Tue Jan 16 2018
.low water advisory in effect until 6 pm cst Wednesday...
.small craft advisory in effect until 4 am cst Wednesday...
Rest of tonight..North winds 15 to 25 knots becoming 15 to 20 knots after midnight. Bay waters choppy.
Wednesday..North winds 15 to 20 knots decreasing to 10 to 15 knots in the afternoon. Bay waters choppy becoming slightly choppy in the afternoon.
Wednesday night..Northeast winds 5 to 10 knots. Bay waters smooth.
Thursday..Northeast winds 5 to 10 knots. Bay waters smooth. A slight chance of showers.
Thursday night..East winds 5 to 10 knots. Bay waters smooth. A slight chance of showers.
Friday..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers.
Friday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers.
Saturday..South winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers.
Saturday night..South winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers.
Sunday..South winds 10 to 15 knots becoming southwest in the afternoon. Bay waters slightly choppy. A chance of showers and isolated Thunderstorms.
Sunday night..Northwest winds 5 to 10 knots increasing to 10 to 15 knots after midnight. Bay waters smooth becoming slightly choppy after midnight. A slight chance of showers.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 913 Pm Cst Tue Jan 16 2018
Synopsis for high island to matagorda ship channel out 60 nm.. Strong cold northerly winds will continue tonight. NEar and below freezing ambient temperatures are expected in the bays and nearshore waters. Wind speeds will gradually diminish Wednesday. High pressure will move east of the region allowing onshore winds to resume by Thursday night and persist into the weekend. The threat of sea fog may return to the area Friday. The next front should move into the area late Sunday.

7 Day Forecast for Marine Location Near Houston, TX
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location: 29.74, -95.33     debug


Area Discussion for - Houston/Galveston, TX
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Fxus64 khgx 170532
afdhgx
area forecast discussion
national weather service houston galveston tx
1132 pm cst Tue jan 16 2018

Aviation
High pressure will continue to edge into the region from the
north early Wednesday, allowingVFR conditions to prevail
throughout the TAF period across all terminals. Clear skies are
in store for the northern set of TAF sites, with some high clouds
lingering throughout the day Wednesday at iah and southward.

There will be a small break in these high clouds at the metro and
coastal TAF sites in the late morning to early afternoon hours,
although high clouds will begin to fill back in by late afternoon
across most terminals.

Overall, winds will drive the forecast for this TAF package.

Winds should stay up through the night, ranging between 5 to 15
kts. The northern set of terminals will experience wind speeds on
the lower end of this range, with wind speeds increasing towards
the coast. Gls is continuing to gust between 25 to 30 kts, and
should continue to experience gusty conditions through the early
morning hours. Winds overall will continue to veer to the
northeast, and slowly lower to between 5 to 8 kts by Wednesday
evening.

Hathaway

Prev discussion issued 851 pm cst Tue jan 16 2018
discussion...

Icy roads will produce dangerous driving conditions through
Wednesday morning...

the last bit of precipitation is exiting the coast near matagorda
bay. Additional precipitation is not expected overnight as upper
level winds become increasingly confluent and much drier air works
into the region from the surface up to 700 mb. Since the precip
has ended, can't really justify the winter storm warning so will
replace it with a winter weather advisory. The advisory is going
to be used to heighten awareness about how dangerous driving will
be tonight. Roads are wet and as temperatures drop, the roads and
bridges will become icy. Winds don't decouple so the combination
of the moderate winds and cold temps will yield dangerous wind
chill values in the single digits. The wind chill advisory and
hard freeze warning will remain in effect through 10 am Wednesday
morning.

Forecast soundings at fwd show significant drying and satellite
imagery shows clearing just on the doorstep of the hgx cwa. The
clouds have kept the temperatures stable over the last couple of
hours but feel once skies begin to clear, the temperatures will
begin to drop. Temperatures are in the teens upstream and
continued cold air advection should allow temperatures to fall
into the teens over the north and lower mid 20s south.

Prev discussion... Issued 527 pm cst Tue jan 16 2018
aviation...

the main band of wintry precipitation is continuing to shift
southward this evening, leaving behindVFR ceilings. This
precipitation which has been a mixture between ice pellets and
light snow, is continuing to impact sgr, hou, lbx, and gls.

Expecting the remnant precipitation to push offshore by 03z.

Ceilings will continue to rise andVFR conditions will prevail
across all TAF sites.

North winds will decrease through the early evening across the
northern set of terminals. The metro and coastal terminals will
keep wind speeds between 10-20 kts overnight, with conditions
gusting to around 25 kts specifically at gls. By sunrise, wind
speeds will have decreased to around 10 kts for all terminals
beside gls which could still see wind gusts approach 20 kts.

Wind direction will gently veer from the north to northeast.

Hathaway
prev discussion... Issued 345 pm cst Tue jan 16 2018
discussion...

you know you have had a busy day when you completely forget to
write a morning update afd. Sorry but on the bright side we did
get all the other products updated and put information in nwschat
for ems and media to know our plans for the forecast.

Today we saw a mix of precipitation but mainly sleet. There was
some freezing rain to start but the accumulations remained low.

However accumulations were not low enough to not cause problems
and then there was sleet snow falling on top of that ice and
frozen structures to make for a mess on area highways, bridges and
overpasses. Radar still shows a batch of precipitation coming from
the west which should reach houston over the next hour or two in
time for rush hour. Hopefully people stay home or left work early
because any precipitation that falls will be sleet snow making
travel conditions worse than they are already. Temperatures are
solidly in the mid upper 20s so we will continue the winter storm
warning for a portion of the area. This area is basically south of
brenham to huntsville. North of that line a winter weather
advisory is in effect mainly for hazardous travel conditions.

Tonight temperatures drop more into the teens and low 20s so a
hard freeze warning is in effect for the whole area through
Wednesday morning. Winds are still blowing quite strong which
lowers wind chill values below 13f so we have a wind chill
advisory in effect for the same time frame as the hard freeze
warning. It is just best not to be outside tonight or travel. If
stuck outside frost bite and hypothermia will be issues.

The plan for the winter weather advisory and winter storm warning
will be to cancel as needed this evening with precipitation ending
from north to south. Look for updates to these products through
the evening tonight.

Extended forecast... Cold continues Wednesday. The record low
maximum temperature for iah is 36f. We have a high of 37f so we
will be flirting with that record. That should let you know how
cold it will be tomorrow. From there conditions do warm up with
warm air advection occurring Friday through Sunday. Low
temperatures will be back in the 50s for the weekend. Another
front and storm system moves across on Sunday so will keep some
solid rain chances going for Sunday. High pressure builds in early
next week but temperatures will be back near normal or slightly
above Monday and Tuesday next week.

Overpeck
marine...

small craft advisory in effect now with winds gradually
diminishing tonight early Wednesday. Seas though will still be big
problem offshore with 11-13 feet but these too will be coming
down after midnight.

Tide levels have dropped to -1.2 to -1.8 feet and so have
continued the low water advisory through the next full tide cycle
Wednesday afternoon. Some slight improvement possible but still
challenging marine conditions with the strong winds currents and
low water levels.

High pressure settles in Wednesday and winds relax and eventually
turn to the east Thursday and southeast Thursday night Friday
morning. By late Friday dewpoints will rebound and potential for
sea fog increases dramatically. Sst getting a good chilling today
and at gls was down to 44 this afternoon.

45
fire...

very low dewpoints will filter into the area but with winds
relaxing do not anticipate any elevated fire conditions. Sunny
skies Wednesday with an increase in clouds Thursday as winds turn
around to the east.

45

Preliminary point temps pops
College station (cll) 29 17 37 21 43 60 10 0 10 10
houston (iah) 31 20 37 23 43 80 10 0 10 10
galveston (gls) 39 25 36 31 45 70 30 0 10 10

Hgx watches warnings advisories
Tx... Hard freeze warning until 10 am cst Wednesday for the following
zones: austin... Brazoria... Brazos... Burleson... Chambers...

colorado... Fort bend... Galveston... Grimes... Harris...

houston... Jackson... Liberty... Madison... Matagorda...

montgomery... Polk... San jacinto... Trinity... Walker...

waller... Washington... Wharton.

Winter weather advisory until 5 am cst Wednesday for the
following zones: austin... Brazoria... Brazos... Burleson...

chambers... Colorado... Fort bend... Galveston... Grimes...

harris... Houston... Jackson... Liberty... Madison...

matagorda... Montgomery... Polk... San jacinto... Trinity...

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

Wind chill advisory until 10 am cst Wednesday for the following
zones: austin... Brazoria... Brazos... Burleson... Chambers...

colorado... Fort bend... Galveston... Grimes... Harris...

houston... Jackson... Liberty... Madison... Matagorda...

montgomery... Polk... San jacinto... Trinity... Walker...

waller... Washington... Wharton.

Gm... Low water advisory from 4 am to 6 pm cst Wednesday for the
following zones: galveston bay... Matagorda bay.

Small craft advisory until 4 am cst Wednesday for the following
zones: galveston bay... Matagorda bay.

Small craft advisory until 6 am cst 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.

Small craft advisory until noon cst Wednesday for the following
zones: 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... 43
aviation marine... 08


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCHT2 - 8770777 - Manchester, TX 4 mi46 min N 8.9 G 14 26°F 51°F1039.1 hPa
MGPT2 - 8770613 - Morgans Point, TX 19 mi46 min N 12 G 15 46°F1039.7 hPa
EPTT2 - 8771013 - Eagle Point, TX 28 mi52 min NNE 15 G 20 27°F 43°F1039.6 hPa
GRRT2 38 mi46 min N 17 G 22 27°F 41°F1039.1 hPa
GTOT2 41 mi46 min NNE 15 G 21 28°F 47°F1038.8 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 42 mi52 min N 20 G 25 47°F1038.2 hPa
RLOT2 - 8770971 - Rollover Pass, TX 46 mi46 min N 18 G 20 26°F 36°F1038.9 hPa
LUIT2 47 mi46 min N 20 G 24 28°F 44°F1038.3 hPa

Wind History for Morgans Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
John Dunn Helistop, TX4 mi69 minN 010.00 miMostly Cloudy25°F10°F54%1038.9 hPa
Houston, Houston Hobby Airport, TX7 mi71 minN 1110.00 miOvercast25°F17°F72%1040.3 hPa
Houston / Ellington, TX12 mi74 minNNW 410.00 miMostly Cloudy25°F17°F74%1040 hPa
Houston Intercontinental Airport, TX16 mi71 minN 1310.00 miMostly Cloudy25°F14°F63%1040.4 hPa
Houston, Pearland Regional Airport, TX16 mi71 minN 13 G 1910.00 miOvercast26°F18°F71%1040 hPa
Houston Southwest Airport, TX18 mi69 minno data10.00 miOvercast25°F16°F71%1040 hPa
Houston, Sugar Land Municipal / Hull Field Airport, TX19 mi71 minN 1210.00 miOvercast27°F16°F63%1039.9 hPa

Wind History from MCJ (wind in knots)
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Last 24hr5N13N16
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CalmCalmCalmCalmCalmCalmCalm--CalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmSE7SE7SE8SE8
G13
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6E6CalmSE7
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2 days agoNE5NE6E6E6E6NE7NE6NE6NE4E8E85
G10
CalmNE5466SE84CalmSE4SE7SE75
G11

Tide / Current Tables for Houston Ship Channel, Galveston Bay, Manchester, Texas
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Houston Ship Channel
Click for Map
Wed -- 07:16 AM CST     Sunrise
Wed -- 07:35 AM CST     Moonrise
Wed -- 03:28 PM CST     -0.70 feet Low Tide
Wed -- 05:45 PM CST     Sunset
Wed -- 06:29 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.90.80.80.70.60.60.60.50.40.20-0.2-0.4-0.6-0.7-0.7-0.6-0.3-00.30.50.80.9

Tide / Current Tables for San Jacinto Battleground State Historic Site, Texas
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San Jacinto Battleground State Historic Site
Click for Map
Wed -- 07:16 AM CST     Sunrise
Wed -- 07:35 AM CST     Moonrise
Wed -- 03:25 PM CST     -0.82 feet Low Tide
Wed -- 05:45 PM CST     Sunset
Wed -- 06:29 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.70.60.50.40.40.40.40.30.20.1-0.1-0.3-0.5-0.7-0.8-0.8-0.7-0.5-0.20.10.30.50.6

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 (2,6,7,8)
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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.