Sunday, January17, 2021
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Marine Weather and Tides
Dayton, TX

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:15AMSunset 5:46PM Sunday January 17, 2021 6:26 PM CST (00:26 UTC) Moonrise 10:30AMMoonset 10:18PM Illumination 21% Phase: Waxing Crescent; Moon at 5 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- 316 Pm Cst Sun Jan 17 2021
Tonight..Northwest winds around 5 knots becoming east after midnight. Bay waters smooth.
Monday..Southeast winds 5 to 10 knots. Bay waters smooth.
Monday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday night..Southeast winds 5 to 10 knots becoming east after midnight. Bay waters smooth. Patchy fog late.
Wednesday..Northeast winds 5 to 10 knots becoming east in the afternoon. Bay waters smooth. Patchy fog. A slight chance of showers in the afternoon.
Wednesday night..South winds 5 to 10 knots becoming around 10 knots after midnight. Bay waters smooth becoming smooth to slightly choppy after midnight. Patchy fog. A slight chance of showers.
Thursday..South winds around 10 knots. Bay waters smooth to slightly choppy. Patchy fog. A chance of showers.
Thursday night..South winds 5 to 10 knots. Bay waters smooth. Patchy fog. A slight chance of showers.
Friday..South winds 5 to 10 knots. Bay waters smooth. Patchy fog. A slight chance of showers.
Friday night..South winds around 10 knots. Bay waters smooth to slightly choppy. A slight chance of showers in the evening. Patchy fog.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 316 Pm Cst Sun Jan 17 2021
Synopsis for high island to matagorda ship channel out 60 nm.. Light winds and smooth seas will persist for the rest of the day due to high pressure overhead. This area of high pressure will move out into the northern gulf with southeasterly flow developing Monday and strengthening going into Tuesday. Seas will gradually increase to 4 to 7 feet by Tuesday as a result. Moisture increases ahead of a slow moving cold front that will likely stall inland on Wednesday. The threat for sea fog begins Tuesday night and becomes more likely by Wednesday afternoon. The sea fog may linger off and on into the weekend. A weak cold front will approach the coast Friday night but it may struggle to push completely offshore. Southerly flow returns by the start of the weekend.


7 Day Forecast for Marine Location Near Dayton, TX
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location: 30.11, -95     debug


Area Discussion for - Houston/Galveston, TX
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FXUS64 KHGX 172339 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 539 PM CST Sun Jan 17 2021

AVIATION. Light and variable winds overnight with a few high clouds. Strengthening SE to S winds during the day tomorrow (maybe becoming gusty too) along with gradually increasing clouds generally around 3000-5000 feet. Anticipating a BKN/OVC deck around 5000 feet to develop late in the afternoon or early tomorrow evening, and winds should be coming down some in the evening. 42

PREV DISCUSSION. /ISSUED 329 PM CST Sun Jan 17 2021/

SHORT TERM [Today through Tuesday Afternoon] . Cloud cover briefly returned to the area as a weak shortwave passed through the area this morning. A quiet weather day is expected across Southeast Texas as high pressure remains overhead. Mid-level flow is still northwesterly, so we're still seeing the advection of dry air (and a bit of dust) as dew points this afternoon have fallen into the mid 20s. This creates a bit of concern for fire weather as RH values are down into the 20-30% range. Surface winds will remain around 5-8 knots and transition to light and variable by the late afternoon. Afternoon high temperatures for today will be in the mid- to-upper 60s thanks to the plentiful dry air. Temperatures will be a bit warmer beginning tonight as the area of high pressure pushes off to the east and introduces a southeasterly flow into the CWA. Most of us will be waving goodbye to lows in the 30s as the southeasterly wind will only allow temperatures to drop into the low 40s. Our northern counties will still drop into the upper 30s. For our cold weather fans, this will be the last cold night for the rest of the work week. By tomorrow, high temperatures will breach the 70 degree mark for most locations and low temperatures will be in the mid-to- upper 50s courtesy of some good ol' WAA as southeasterly winds continue to strengthen. The upward trend of temperatures continues into Tuesday with highs topping out in the mid 70s.

The southeasterly flow is an integral part of the forecast for this upcoming week because it will provide more than just WAA. Theta-E (instability) and PWATs will gradually increase across Southeast Texas beginning on Monday afternoon. This is important because a cold front is expected to stall over our northwestern counties on Tuesday morning which will create an area of convergence. At this point, PWATs will be around an inch across most of Southeast Texas. Rain chances will be highest across the northwestern portion of the CWA for Tuesday thanks to the lift provided by the frontal boundary. Relatively dry mid-levels and a subsidence inversion around 700 mb left over from the departing area of high pressure indicates that heavy rain is not likely, at least through Tuesday afternoon. Moisture will continue to increase going into midweek as the southeasterly winds persist and will eventually mix out this inversion and moisten up the mid-levels. 26

LONG TERM [Tuesday Night Through Sunday] . Shallow, stalled frontal boundary will linger about northern parts of the CWA into Wed then eventually washout Wed night & Thurs. This boundary, along with embedded disturbances riding in the swly flow aloft will provide continued chances of precip in that general vicinity. Further south, lack of a focusing/forcing mechanism and mid level ridging nosing into the area from the Gulf will be limiting factors for precip. But they won't be left out of the dreariness - persistent llvl warm/moist onshore winds moving over cooler shelf waters should produce cldy conditions and a somewhat favorable set-up for sea fog into the weekend. Next upper trof digs down the west coast this weekend, but medium range solns are not on the same page in regards to when it'll start making some ewd progression. This leads to considerable fcst uncertainty Sat- Tue, but figure we'll see at least some iso/sct precip around until we get its associated frontal boundary thru the region which appears beyond the scope of this fcst package. 47

MARINE . Light northerly winds and smooth seas persist as high pressure remains overhead. This area of high pressure will begin to push off to the east overnight, which will introduce an onshore southeasterly flow that will gradually strengthen. Wind speeds will approach SCA criteria on Monday night/early Tuesday morning. The onshore flow will persist through most of the week seas will build up to 4-7 feet by Tuesday. Moisture will be on the rise as well which will bring about the threat of sea fog from Tuesday night and into the weekend for the coastal areas and nearshore waters. A cold front will approach the coast late on Friday, but forecast models indicate that it will not push all the way through. Wind flow transitions to southerly by the start of the weekend. 26

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 39 69 56 72 52 / 0 0 20 40 50 Houston (IAH) 41 68 57 72 55 / 0 0 10 10 10 Galveston (GLS) 51 64 59 66 58 / 0 0 0 10 10

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGPT2 - 8770613 - Morgans Point, TX 30 mi56 min W 4.1 G 4.1 63°F 53°F1018.1 hPa
NCHT2 - 8770777 - Manchester, TX 30 mi56 min WNW 1.9 G 4.1 64°F 55°F1017.7 hPa
EPTT2 - 8771013 - Eagle Point, TX 44 mi56 min S 5.1 G 6 58°F 56°F1017.8 hPa
HIST2 48 mi56 min SSW 4.1 G 5.1 57°F 52°F1017.9 hPa
RLOT2 - 8770971 - Rollover Pass, TX 49 mi56 min SSW 2.9 G 2.9 55°F 54°F1018.4 hPa

Wind History for Morgans Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cleveland, TX17 mi51 minN 07.00 miFair59°F28°F31%1018.6 hPa
Houston Intercontinental Airport, TX21 mi33 minN 010.00 miA Few Clouds57°F30°F36%1018.3 hPa

Link to 5 minute data for K6R3

Wind History from 6R3 (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW3NW4NW8
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1 day agoNW5NW6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW5N5N9
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Tide / Current Tables for Lynchburg Landing, San Jacinto River, Texas
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Lynchburg Landing
Click for Map
Sun -- 01:33 AM CST     1.24 feet High Tide
Sun -- 07:16 AM CST     Sunrise
Sun -- 07:54 AM CST     0.87 feet Low Tide
Sun -- 10:22 AM CST     0.91 feet High Tide
Sun -- 10:29 AM CST     Moonrise
Sun -- 05:45 PM CST     Sunset
Sun -- 06:02 PM CST     0.32 feet Low Tide
Sun -- 10:19 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.21.21.21.110.90.90.90.90.90.90.90.80.70.50.40.40.30.40.50.60.81

Tide / Current Tables for Point Barrow, Trinity Bay, Texas
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Point Barrow
Click for Map
Sun -- 02:03 AM CST     0.68 feet High Tide
Sun -- 06:07 AM CST     0.47 feet Low Tide
Sun -- 07:15 AM CST     Sunrise
Sun -- 10:28 AM CST     Moonrise
Sun -- 11:25 AM CST     0.56 feet High Tide
Sun -- 05:43 PM CST     -0.24 feet Low Tide
Sun -- 05:44 PM CST     Sunset
Sun -- 10:18 PM CST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.70.70.60.60.50.50.50.50.50.50.60.60.50.30.1-0.1-0.2-0.2-0.2-0.100.20.3

Weather Map
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wmap_A
GEOS Local Image of    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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Ground Weather Radar Station



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.