Saturday, December16, 2017 L-36.com


Marine Weather and Tides
San Leon, 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 7:06AMSunset 5:25PM Saturday December 16, 2017 10:52 AM CST (16:52 UTC) Moonrise 5:34AMMoonset 4:34PM Illumination 3% Phase: Waning Crescent; Moon at 28 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
    EDIT      (on/off)   Help
GMZ335 Matagorda Bay-galveston Bay- 919 Am Cst Sat Dec 16 2017
Rest of today..East winds 10 to 15 knots increasing to 20 to 25 knots in the afternoon. Bay waters slightly choppy becoming rough in the afternoon. A slight chance of showers. Isolated Thunderstorms late in the afternoon.
Tonight..East winds 20 to 25 knots becoming north 5 to 10 knots after midnight. Bay waters rough becoming smooth after midnight. Patchy fog. Showers and isolated Thunderstorms. Some Thunderstorms may be severe in the evening.
Sunday..Northeast winds 5 to 10 knots becoming east in the afternoon. Bay waters smooth. A slight chance of showers.
Sunday night..East winds 5 to 10 knots. Bay waters smooth. Areas of fog. A slight chance of showers in the evening. A chance of showers after midnight.
Monday..Southeast winds 5 to 10 knots. Bay waters smooth. Areas of fog. Showers likely.
Monday night..East winds around 5 knots becoming north after midnight. Bay waters smooth. Areas of fog. A chance of showers.
Tuesday..Northwest winds 5 to 10 knots. Bay waters smooth. A chance of showers with possible drizzle and Thunderstorms.
Tuesday night..West winds 10 to 15 knots. Bay waters slightly choppy. Patchy fog. Showers likely with possible drizzle and Thunderstorms.
Wednesday..Northwest winds 10 to 15 knots decreasing to 5 to 10 knots in the afternoon. Bay waters slightly choppy becoming smooth in the afternoon.
Wednesday night..North winds around 5 knots becoming southeast after midnight. Bay waters smooth.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 919 Am Cst Sat Dec 16 2017
Synopsis for high island to matagorda ship channel out 60 nm.. Small craft should exercise caution, as onshore winds continue to strengthen this afternoon in response to a coastal trough of low pressure moving up from the middle texas coast. This system will bring unsettled weather as it moves through the coastal waters. A small craft advisory has been issued for this afternoon and tonight. Gusts to gale force will be possible this evening. This disturbance will push east of the area Sunday, and periods of fog will remain a possibility until the next front pushes through on Tuesday or Wednesday.

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


Area Discussion for - Houston/Galveston, TX
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus64 khgx 161639
afdhgx
area forecast discussion
national weather service houston galveston tx
1039 am cst Sat dec 16 2017

Update
Morning surface analysis shows a coastal trough beginning to
develop from near the texas coastal bend south towards
brownsville, with further deepening into a closed surface low
expected this morning as height falls associated with an upper
trough lifting into southwest texas spread across the northwest
gulf. Current forecast with regards to this coastal low remains
largely on track as steering flow pushes this feature up the texas
coast late this afternoon through tonight.

Morning soundings showed precipitable water values of 0.93 inches
and 1.15 inches at lake charles and corpus christi, respectively,
and as this coastal system strengthens today forecast
precipitable water values surge into the 1.5 to 1.8 inch range.

This is much above normal for this time of year (average values
usually 0.75-0.9 per SPC sounding climatology). This moisture,
combined with mid-level lapse rates steepening to 6-6.5 c km as
the upper trough crosses texas, will mean the atmosphere is
supportive of numerous to widespread showers and thunderstorms as
the coastal low skirts the upper texas coast tonight. High
resolution guidance and convection allowing models are all showing
a fairly consistent signal for light showers to spread into the
western counties later this morning as divergence aloft increases
(which is already fairly well supported by ongoing activity across
the hill country seen on regional radar mosaic), spreading east
across the region through the afternoon. Increased surface
convergence associated with the development of the coastal low
looks to result in the development of a line of thunderstorms this
evening that quickly moves across southeast texas west to east
between the 6 pm to 1 am timeframe.

As was noted in the overnight forecast package, the track of this
coastal low will be crucial for what hazards materialize for the
region as wind energy associated with this system is very strong.

Preliminary analysis of 12z guidance shows that at least some of
the warm sector (and best potential for surface-based
thunderstorms) may be able to push into matagorda, brazoria,
galveston, and chambers. This means that an isolated tornado or
waterspout threat will exist for a brief window tonight generally
along the immediate coast, but best chances will likely be over
the coastal waters. North of this warm sector, elevated
thunderstorms will preclude this threat. As was noted earlier,
above normal moisture will mean most of the region receives much-
needed rainfall from this system. Unidirectional wind profiles in
the cloud-bearing layer will encourage some training of storms and
allow for rain totals in some areas to accumulate into the 1-3
inch range. However, the speed of this system and fairly low rain
rates due to limited instability will help mitigate against any
widespread or significant flooding threats.

Long story short: most of the region will receive much-needed
rainfall tonight from a fast-moving system that will keep the
widespread flooding risk low. An isolated tornado or waterspout
threat is possible along the immediate coastal areas between 6
pm-1 am but best chances are over the gulf. The main update for
this forecast was to simply update based on latest observations.

Huffman

Preliminary point temps pops
College station (cll) 54 45 65 53 66 80 90 0 20 50
houston (iah) 58 48 68 56 70 20 90 10 30 60
galveston (gls) 60 56 64 60 69 20 80 30 50 70

Hgx watches warnings advisories
Tx... None.

Gm... Small craft advisory until midnight cst tonight 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.

Small craft should exercise caution until noon cst today 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


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 0 mi161 min E 11 G 12 51°F 53°F1023.3 hPa
GRRT2 12 mi161 min ENE 9.9 G 13 53°F 52°F1023.3 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 13 mi167 min ENE 15 G 17 56°F1022.7 hPa
MGPT2 - 8770613 - Morgans Point, TX 14 mi161 min ENE 6 G 8 50°F 56°F1023.2 hPa
GTOT2 14 mi65 min E 8 G 14 56°F 57°F1022.4 hPa
RLOT2 - 8770971 - Rollover Pass, TX 22 mi161 min ENE 8.9 G 11 50°F 51°F1023.1 hPa
NCHT2 - 8770777 - Manchester, TX 25 mi161 min NE 5.1 G 6 51°F 59°F1022.2 hPa
HIST2 29 mi167 min ENE 5.1 G 6 49°F 53°F1023.6 hPa
KXIH 30 mi38 min ESE 14 55°F 39°F
LUIT2 30 mi173 min 54°F
42035 - GALVESTON 22NM East of Galveston, TX 32 mi63 min E 14 G 16 56°F 61°F3 ft1023.4 hPa (-0.0)41°F
FCGT2 - 8772447 - USCG Freeport, TX 42 mi161 min NE 8 G 15 56°F 60°F1022.9 hPa
SRST2 - Sabine Pass, TX 49 mi53 min ENE 11 G 14 51°F 1024.2 hPa (+0.0)37°F

Wind History for Eagle Point, TX
(wind in knots)    EDIT      (on/off)   Help
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
Last
24hr
NE10
G16
NE11
G14
NE11
G16
NE9
G12
NE8
G11
NE5
G8
NE4
N3
NE2
NE5
NE6
E4
NE2
E4
E4
E4
E4
E5
NE7
NE8
E10
E10
G13
E11
E10
1 day
ago
--
SE3
NE3
E2
E1
--
N3
NE5
N5
G9
N4
N7
G10
NE10
G14
N11
G17
N9
G16
N10
G16
N11
G16
N11
G16
NE11
G15
NE10
G15
NE12
G17
NE11
G17
2 days
ago
SE2
SW6
W4
G7
SW4
G7
W5
W3
SW4
SW3
W3
SW2
SW4
W3
SW5
SW4
W2
G5
W3
W3
W2
W2
--
SW5
NW3
SW3
SE1

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Galveston, Scholes Field, TX15 mi61 minE 1210.00 miOvercast57°F43°F60%1023.6 hPa
Houston / Ellington, TX16 mi63 minE 910.00 miMostly Cloudy54°F42°F67%1024 hPa
Houston, Pearland Regional Airport, TX17 mi60 minE 810.00 miOvercast53°F37°F55%1023.9 hPa
Houston, Houston Hobby Airport, TX22 mi60 minESE 810.00 miMostly Cloudy54°F39°F59%1023.7 hPa

Wind History from GLS (wind in knots)
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
Last 24hrN16NE12N13N13N11N8N10NE5N5N5N6NE5NE7CalmE5NE5N4NE4N7NE7N7NE7E9E12
1 day agoCalmCalmS3SE5SE3SE4CalmCalmCalmN4N8N11N12N12N14N18
G25
N19N17
G22
N19
G24
N18
G24
N16
G23
N17N13N14
G23
2 days agoS7S8W5W6SW10SW6SW6SW6SW5SW4SW3SW6SW4SW4SW4CalmCalmCalmCalmCalmCalmS5CalmCalm

Tide / Current Tables for Eagle Point, Galveston Bay, Texas
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Eagle Point
Click for Map
Sat -- 05:33 AM CST     Moonrise
Sat -- 07:07 AM CST     Sunrise
Sat -- 11:46 AM CST     -0.46 feet Low Tide
Sat -- 04:34 PM CST     Moonset
Sat -- 05:23 PM CST     Sunset
Sat -- 11:00 PM CST     0.71 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.70.70.60.60.50.30.2-0-0.2-0.3-0.4-0.5-0.4-0.3-0.10.10.30.40.50.60.70.70.7

Tide / Current Tables for Bolivar Roads, Texas Current
   EDIT      (on/off)   Help   One Week of Data
Bolivar Roads
Click for Map
Sat -- 01:59 AM CST     -0.28 knots Min Ebb
Sat -- 05:33 AM CST     Moonrise
Sat -- 07:06 AM CST     Sunrise
Sat -- 08:04 AM CST     -2.06 knots Max Ebb
Sat -- 12:23 PM CST     0.00 knots Slack
Sat -- 03:56 PM CST     2.14 knots Max Flood
Sat -- 04:34 PM CST     Moonset
Sat -- 05:23 PM CST     Sunset
Sat -- 09:58 PM CST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-0.4-0.3-0.4-0.7-1.1-1.6-1.9-2.1-2-1.7-1.1-0.40.61.422.121.61.10.70.4-0-0.3

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of SouthCentralPlains    EDIT
Geos

Wind Forecast for Houston/Galveston, TX (11,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Houston/Galveston, TX
   (on/off)   Help
weather_mapweather_map weather_map

Gulf Stream Current


Ad by Google

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.