Friday, January17, 2020
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Marine Weather and Tides
Clear Lake Shores, TX

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:14AMSunset 5:46PM Friday January 17, 2020 7:45 AM CST (13:45 UTC) Moonrise 12:18AMMoonset 12:15PM Illumination 52% Phase: Third Quarter Moon; Moon at 22 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- 400 Am Cst Fri Jan 17 2020
Today..East winds around 10 knots. Bay waters smooth to slightly choppy. Patchy fog early in the morning. A slight chance of drizzle.
Tonight..Southeast winds around 10 knots becoming south after midnight. Bay waters smooth to slightly choppy becoming smooth after midnight. A slight chance of drizzle. A chance of showers late. Patchy fog in the late evening and overnight hours.
Saturday..Light and variable winds becoming northeast 5 to 10 knots in the afternoon. Bay waters smooth. Patchy fog. A chance of showers. Isolated Thunderstorms in the afternoon.
Saturday night..North winds 10 to 15 knots increasing to 15 to 20 knots after midnight. Bay waters slightly choppy becoming choppy after midnight. A chance of showers in the evening, then a slight chance of showers after midnight.
Sunday..Northeast winds 15 to 20 knots decreasing to 10 to 15 knots in the afternoon. Bay waters choppy becoming slightly choppy in the afternoon.
Sunday night..Northeast winds 10 to 15 knots increasing to 15 to 20 knots after midnight. Bay waters slightly choppy becoming choppy after midnight.
Monday..Northeast winds 10 to 15 knots. Bay waters slightly choppy.
Monday night..Northeast winds 5 to 10 knots. Bay waters smooth.
Tuesday..East winds 5 to 10 knots. Bay waters smooth. A slight chance of showers late in the afternoon.
Tuesday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers in the evening, then a chance of showers after midnight.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 400 Am Cst Fri Jan 17 2020
Synopsis for high island to matagorda ship channel out 60 nm.. Areas of sea fog will exist through the day. Local bay and gulf nearshore fog is forecast to become dense once again tonight through early Saturday morning. The next cold front will pass off the coast late Saturday afternoon and end the fog threat. Strengthened northeast winds and elevated seas will persist from Saturday evening through Monday afternoon. Onshore flow will resume as high pressure moves off to the east Tuesday.


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 171244 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 644 AM CST Fri Jan 17 2020

AVIATION. Areawide LIFR to IFR will slowly break up and lift to higher end IFR or even MVFR, brief late day VFR. Ceilings will fall back to LIFR/IFR categories around sunset tonight. eastern dry air has thinned recent maritime dense fog and today's visibilities should remain VFR or tempo MVFR within lingering light fog or haze. Fog is forecast to return to the maritime and surrounding areas and become more dense; limiting visibilities to under 2 miles at times. The majority of the interior terminals should stay up to MVFR in visibility but LIFR to IFR in ceiling. Today's precipitation will be light, from showers to drizzle or mist. Weak easterlies will veer more southeast through this afternoon. 31

PREV DISCUSSION. /ISSUED 436 AM CST Fri Jan 17 2020/

SHORT TERM [Today through Tomorrow] .

A near stationary boundary is draped across the southwestern forecast area this morning. Drier air north of this boundary has filtered into the eastern CWA and Galveston Bay area. This upper 50 Td air has temporarily swept Galveston fog away while more moist air south of the boundary has kept 2 to 3 mile visibility nearshore fog in place. Low overcast will slowly lift/improve from southwest to northeast through mid afternoon as veering winds pull up a drier southerly mid layer air mass further inland. There will be periods of either mist, drizzle or very light showers today. Afternoon temperatures will warm into the upper 60s to lower 70s, middle 70s the further southwest one travels due to thinning cloud cover brought on by the Gulf dry air advection.

As late afternoon into early evening temperatures cool to within a few degrees of their respective dew points, lower levels will saturate back up and clouds will again lower and fog will return. Sea fog is forecast to thicken up with areas of dense sea fog again plaguing the Gulf nearshore and bay waters. The approach and passage of a Saturday afternoon cold front will end this recent fog event. The front will be across the Brazos River Valley by 11 AM, metro by 4 PM and off the coast during the early evening hours. Showers with an isolated storm will increase in probability and coverage ahead and along of this latest cold front. Cold air advection in the wake of the front will regulate northern county afternoon temperatures to the middle 60s but downstream central and southern county temperatures will warm into the middle 70s before the late day frontal passage. 31

LONG TERM [Sunday Through Friday] .

Winter season temperatures will return to the area in the wake of Saturday's cold front and will continue into the first half of the week. The coldest nights will be Sunday night and Monday night with near freezing temperatures possible across parts of our far northern counties. High temperatures will be in the 50s for a majority of the area Sunday through Tuesday. This cool and dry spell comes to an end beginning Tuesday night or Wednesday as surface high pressure begins moving off to the east and the next storm system starts to organize off to our west. Models have some timing and strength differences with this system, but looks like the timing for the best rain chances will be in a Wednesday night through Thursday night time period when parts of the area will have some potential to get a couple inches of rain before the system's cold front moves on through. This event's timing and amounts will likely need adjusting over the next several days, so stay tuned. 42

MARINE .

As drier air has filtered in behind a slowly southern-moving coastal front sea fog has thinned to haze across the eastern waters and Galveston Bay. Thus, the Marine Fog Advisory has been cancelled for the remainder of the morning. As winds become more onshore through the day and the lower level warmer more moist air overrides cooler nearshore waters, dense fog is likely to return tonight through early Saturday morning. Winds and seas has lowered so there are no flags anticipated through tomorrow afternoon. Strong north winds behind a Saturday night frontal passage will likely have water-wide Advisory flags in place through Monday morning. 31

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 71 61 65 39 55 / 20 50 60 10 0 Houston (IAH) 71 63 74 45 56 / 40 20 50 20 10 Galveston (GLS) 68 63 72 51 57 / 20 20 50 30 10

HGX WATCHES/WARNINGS/ADVISORIES. TX . NONE. GM . NONE.

Short/Aviation/Marine . 31 Long . 42


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EPTT2 - 8771013 - Eagle Point, TX 6 mi52 min 64°F 65°F1023.4 hPa
MGPT2 - 8770613 - Morgans Point, TX 9 mi52 min 61°F 65°F1024.3 hPa
GRRT2 18 mi52 min 63°F 65°F1023.4 hPa
NCHT2 - 8770777 - Manchester, TX 19 mi52 min 61°F 67°F1024.1 hPa
GNJT2 - 8771341 - Galveston Bay (North Jetty), TX 20 mi52 min 63°F 63°F1022.8 hPa
GTOT2 20 mi52 min 63°F 63°F1023.7 hPa
RLOT2 - 8770971 - Rollover Pass, TX 26 mi52 min 63°F 63°F1024.4 hPa
HIST2 32 mi52 min 62°F 66°F1024.1 hPa
LUIT2 33 mi52 min 64°F 66°F1024.7 hPa
KXIH 36 mi31 min E 16 66°F 66°F
42035 - GALVESTON 22NM East of Galveston, TX 38 mi26 min 12 G 14 1025 hPa
FCGT2 - 8772447 - USCG Freeport, TX 45 mi52 min 64°F 63°F1023.9 hPa
FPST2 45 mi52 min 63°F 68°F1023.1 hPa

Wind History for Eagle Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston / Ellington, TX10 mi56 minENE 85.00 miFog/Mist61°F60°F100%1024.4 hPa
Houston, Pearland Regional Airport, TX13 mi53 minE 114.00 miFog/Mist63°F60°F90%1024.4 hPa
Houston, Houston Hobby Airport, TX16 mi53 minENE 105.00 miFog/Mist62°F60°F93%1024.7 hPa
Galveston, Scholes Field, TX21 mi54 minENE 118.00 miOvercast65°F64°F97%1023.9 hPa
John Dunn Helistop, TX24 mi51 minVar 71.75 miFog/Mist61°F60°F100%1024.4 hPa

Link to 5 minute data for KEFD

Wind History from EFD (wind in knots)
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Last 24hrE3E5E5E6E9--E7--SE7SE7E8SE7--E8E12E12E8E9E9E10E7NE8E6E8
1 day agoS5S5S5S9S9S9S6--------------------------------Calm
2 days agoS5--S8S8S8S10S10S10S10S8S7S4S5SE6SE6SE8S8S8S7S6S6S8S7S6

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Fri -- 12:18 AM CST     Moonrise
Fri -- 03:27 AM CST     0.36 feet High Tide
Fri -- 07:00 AM CST     Last Quarter
Fri -- 07:15 AM CST     Sunrise
Fri -- 10:44 AM CST     -0.20 feet Low Tide
Fri -- 12:15 PM CST     Moonset
Fri -- 04:40 PM CST     0.19 feet High Tide
Fri -- 05:44 PM CST     Sunset
Fri -- 10:03 PM CST     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.20.30.30.30.30.20.1-0-0.1-0.2-0.2-0.2-0.100.10.20.20.20.10.10.100.1

Tide / Current Tables for Bolivar Roads, Texas Current
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Bolivar Roads
Click for Map
Fri -- 12:17 AM CST     Moonrise
Fri -- 12:49 AM CST     -0.00 knots Slack
Fri -- 04:46 AM CST     -1.25 knots Max Ebb
Fri -- 07:00 AM CST     Last Quarter
Fri -- 07:14 AM CST     Sunrise
Fri -- 08:12 AM CST     0.00 knots Slack
Fri -- 11:05 AM CST     0.95 knots Max Flood
Fri -- 12:14 PM CST     Moonset
Fri -- 02:45 PM CST     -0.00 knots Slack
Fri -- 05:43 PM CST     -0.55 knots Max Ebb
Fri -- 05:44 PM CST     Sunset
Fri -- 08:30 PM CST     0.00 knots Slack
Fri -- 10:22 PM CST     0.36 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.4-0.1-0.6-0.9-1.2-1.2-1.1-0.7-0.10.40.80.90.90.60.2-0.1-0.3-0.5-0.5-0.4-0.20.20.30.3

Weather Map
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wmap_A
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Houston/Galveston, TX (8,2,3,4)
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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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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 numerous 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.