Tuesday, May23, 2017 L-36.com


Marine Weather and Tides
Houston, 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 6:22AMSunset 8:14PM Tuesday May 23, 2017 12:09 AM CDT (05:09 UTC) Moonrise 3:53AMMoonset 4:58PM Illumination 6% Phase: Waning Crescent; Moon at 27 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- 958 Pm Cdt Mon May 22 2017
Rest of tonight..North winds 5 to 10 knots. Bay waters smooth.
Tuesday..North winds 5 to 10 knots becoming northeast in the afternoon. Bay waters smooth. A slight chance of showers and Thunderstorms in the morning, then a chance of showers and Thunderstorms in the afternoon.
Tuesday night..North winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers and Thunderstorms in the evening, then a slight chance of showers and Thunderstorms after midnight.
Wednesday..Northwest winds 10 to 15 knots. Bay waters slightly choppy.
Wednesday night..West winds 5 to 10 knots becoming southwest 10 to 15 knots after midnight. Bay waters smooth becoming slightly choppy after midnight.
Thursday..South winds 10 to 15 knots. Bay waters slightly choppy.
Thursday night..South winds 15 to 20 knots. Bay waters choppy.
Friday..South winds 15 to 20 knots. Bay waters choppy.
Friday night..South winds around 15 knots. Bay waters slightly choppy to choppy.
Saturday..South winds around 15 knots. Bay waters slightly choppy to choppy.
Saturday night..South winds around 15 knots. Bay waters slightly choppy to choppy.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 958 Pm Cdt Mon May 22 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Onshore winds will begin to turn west and eventually be out of the north before the frontal passage Tuesday. This cold front will move across the waters late Tuesday but expect winds to already be out of the north by Tuesday late morning. Strengthening to caution levels behind the boundary passage overnight Tuesday night into Wednesday morning. Onshore winds will return early Thursday and quickly strengthen through the day.

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 230451
afdhgx
area forecast discussion
national weather service houston/galveston tx
1151 pm cdt Mon may 22 2017

Aviation
MVFR conditions across most of TAF sites currently, besides uts,
sgr, and iah which are all at ifr. Expect ceilings to hang tight
through most of the early morning hours. Also expecting
visibilities to lower slightly at cll, uts, cxo, and lbx between
07-11z as the surface moisture plus radiational cooling are in
favor of light fog development. Light winds overnight will also
help to lower visibilities. With the cloud deck in place there
still is a possibility that these TAF sites will remain a tad
warmer to balance out the radiational cooling, and visibilities
will not drop.

Precip has also cleared the region for now, but not for long.

With the cold front moving in from the west tomorrow afternoon,
showers and thunderstorms will move back into cll's vicinity
beginning at 21z. This will spread southward throughout the
afternoon and into the early evening.

Hathaway

Prev discussion /issued 947 pm cdt Mon may 22 2017/
discussion...

all rainfall has diminished across SE texas as of 9:30 pm. Latest
models are showing a lull in the activity during the remainder of
tonight except for off the coast due to a frontal boundary in the
gulf. The front should continue to be a focus for rain chances in
the gulf waters. If the texas tech and nam12 pan out, the next
chances for showers and thunderstorms over the land areas will be
during the mid afternoon lasting into the evening.

Lowered rain chances for tonight and for Thursday morning.

40
prev discussion... /issued 347 pm cdt Mon may 22 2017/
short term (tonight through Tuesday night)...

surface analysis this afternoon showed a remnant boundary/ cold
front stretching from near la ward to south of houston hobby
airport to winnie, with scattered showers developing along this
boundary as it moves southeast towards the coast. Expect the
boundary to continue propagating towards the coast as mid and
upper level flow becomes increasingly perpendicular to the
boundary as a shortwave trough lifts away from east texas.

Subsidence and mid-level dry air advection behind the shortwave
should help limit rain chances tonight after the frontal boundary
clears the coast this evening, but may not entirely prevent a
possible thunderstorm complex advertised in high resolution
guidance from clipping parts of the brazos valley or piney woods
region as it moves out of west texas tonight and weakens.

Additionally, an 80-100 knot upper level jet nosing over the
region will mean that a few showers and maybe a thunderstorm will
remain possible. Not entirely confident on any activity developing
or the west texas thunderstorm complex reaching the region (hence
20 pops north of the coast) but if something is able to develop or
reach the region, cannot rule out some small hail as lapse rates
steepen to nearly 7.5 c/km and the mid-levels of the atmosphere
dry behind today's shortwave. Otherwise, expect overnight lows in
the 60s to low 70s under mostly cloudy skies.

A second shortwave now moving over the texas and oklahoma
panhandles on afternoon water vapor imagery will continue to swing
southeast across texas tonight, reaching the region during the day
tomorrow. This will send another cold front across the region
during the day Tuesday and off the coast Tuesday night, with
scattered showers and thunderstorms developing along and behind
the front as it moves south. The passage of today's frontal
boundary won't completely scour out the moisture in place across
the region tomorrow as precipitable water values remain in the
1.4-1.5 inch range, but slightly less moisture should result in
a lower (but not nonexistent) locally heavy rain threat than
today. Additionally, an inverted-v signature on forecast soundings
out of houston and steep mid- level lapse rates persisting mean
that a few thunderstorms along the front tomorrow may also become
strong to severe and capable of gusty winds and hail. Best chances
for this appear to be along and east of interstate 45 during the
afternoon hours, especially if breaks in the clouds during the
morning contribute to additional destabilization. Afternoon
temperatures on Tuesday are forecast to rise into the mid 70s to
mid 80s.

Expect the cold front to push off the coast Tuesday night with
rain chances tapering off form north to south as drier air filters
in behind the front, with lows Tuesday night in the mid 50s to mid
60s.

Huffman
long term (Wednesday through Sunday)...

north to northwest flow aloft on Wednesday is expected to
gradually transition to shortwave ridging through the end of the
work week, resulting in drier and gradually warming conditions as
highs climb back near 90 by Friday. Shortwave ridging becomes
dampened over the upcoming weekend as a shortwave trough dives
across the four corners. Rain chances increase for the region late
week into the beginning of next week as the passage of this
shortwave trough sends a cold front into the region.

Huffman
marine...

elevated winds and seas will gradually come down later this
afternoon and on into this evening. Periods of mainly scattered
showers and thunderstorms remain possible through Tuesday as
frontal boundaries and a series of disturbances move across the
area. Stronger/deeper northerly winds will not make it into the
gulf until Tuesday night/ Wednesday morning, and caution flags
might be needed during this time. Onshore winds are set to return
to the area by Wednesday night and then strengthen the rest of the
week and on into the weekend. 42

Preliminary point temps/pops
College station (cll) 64 80 56 81 61 / 10 50 30 10 0
houston (iah) 67 83 60 83 63 / 20 40 40 10 0
galveston (gls) 73 81 67 81 73 / 40 40 40 10 0

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

Gm... None.

Aviation/marine... 08


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCHT2 - 8770777 - Manchester, TX 4 mi51 min N 7 G 11 69°F 78°F1012.1 hPa
LYBT2 13 mi51 min NNE 7 G 11 69°F 80°F1011.2 hPa
MGPT2 - 8770613 - Morgans Point, TX 19 mi51 min NNE 9.9 G 13 69°F 80°F1011.8 hPa
EPTT2 - 8771013 - Eagle Point, TX 28 mi51 min NNE 8 G 12 71°F 79°F1011.7 hPa
GRRT2 38 mi51 min NNE 12 G 15 72°F 79°F1011.5 hPa
GTOT2 41 mi51 min 72°F 80°F
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 42 mi57 min NNE 8.9 G 12 80°F1011.1 hPa
RLOT2 - 8770971 - Rollover Pass, TX 46 mi51 min N 8 G 11 70°F 77°F1011.7 hPa
LUIT2 47 mi51 min NNE 12 G 14 73°F

Wind History for Morgans Point, TX
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Last
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E13
G17
NE12
G16
E11
G17
SE15
G21
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G22
SE13
G20
SE11
G18
SE13
G22
SE13
G16
SE9
G14
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G17
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G17
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G19
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NE5
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N7
G10
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W3
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SE4
G7
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NE5
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G14
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G8
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G11
S6
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NE20
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SE7
G10
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G11
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G9
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G12
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G14
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G16
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G13
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G14
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G12
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G13
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G11
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G9

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
John Dunn Helistop, TX4 mi74 minN 810.00 miOvercast68°F64°F88%1010.8 hPa
Houston, Houston Hobby Airport, TX7 mi76 minN 1110.00 miOvercast69°F64°F87%1012.1 hPa
Houston / Ellington, TX12 mi2.3 hrsNNW 910.00 miOvercast70°F68°F94%1011.5 hPa
Houston Intercontinental Airport, TX16 mi76 minN 810.00 miOvercast69°F64°F84%1011.8 hPa
Houston, Pearland Regional Airport, TX16 mi76 minNNE 710.00 miOvercast72°F64°F79%1012 hPa
Houston Southwest Airport, TX18 mi74 minN 710.00 miOvercast69°F64°F86%1011.8 hPa
Houston, Sugar Land Municipal / Hull Field Airport, TX19 mi76 minNNE 1310.00 miOvercast70°F66°F87%1011.8 hPa

Wind History from MCJ (wind in knots)
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Last 24hrE8NE7NE8E9SE14
G22
E10SE18
G27
SE17
G21
SE16S10
G20
SE19
G24
SW9S7
G18
SW3N11
G20
N5N9N7N7N7N9N12N9
G15
N7
1 day agoE3SE4CalmCalmNE8NE5NE5NE7NE6N6NE8NE8CalmE14
G19
E8SE3N8NE10N10
G14
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G17
N4NE9NE9
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2 days agoSE9
G16
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G16
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G16
SE7E7CalmSE4SE6E5SE9SE10S8SE11
G15
S12SE10S12
G17
S9SE8SE7SE8SE7S6

Tide / Current Tables for Houston Ship Channel, Galveston Bay, Manchester, Texas
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Houston Ship Channel
Click for Map
Tue -- 01:56 AM CDT     0.60 feet Low Tide
Tue -- 04:53 AM CDT     Moonrise
Tue -- 06:23 AM CDT     Sunrise
Tue -- 08:53 AM CDT     1.83 feet High Tide
Tue -- 02:39 PM CDT     1.32 feet Low Tide
Tue -- 05:57 PM CDT     Moonset
Tue -- 07:03 PM CDT     1.66 feet High Tide
Tue -- 08:12 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.70.60.70.91.11.41.61.81.81.81.71.51.41.31.31.41.51.61.71.61.51.31

Tide / Current Tables for San Jacinto Battleground State Historic Site, Texas
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San Jacinto Battleground State Historic Site
Click for Map
Tue -- 01:33 AM CDT     0.19 feet Low Tide
Tue -- 04:52 AM CDT     Moonrise
Tue -- 06:23 AM CDT     Sunrise
Tue -- 08:34 AM CDT     1.35 feet High Tide
Tue -- 02:06 PM CDT     0.88 feet Low Tide
Tue -- 05:56 PM CDT     Moonset
Tue -- 06:51 PM CDT     1.25 feet High Tide
Tue -- 08:11 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.20.20.30.50.811.21.31.31.31.210.90.90.911.11.21.21.210.80.5

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 (1,6,7,8)
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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.