Sunday, January17, 2021
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Marine Weather and Tides
Katy, 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 7:17AMSunset 5:49PM Sunday January 17, 2021 12:18 AM CST (06:18 UTC) Moonrise 10:33AMMoonset 10:22PM Illumination 15% Phase: Waxing Crescent; Moon at 4 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- 927 Pm Cst Sat Jan 16 2021
Rest of tonight..West winds around 5 knots becoming northwest after midnight. Bay waters smooth.
Sunday..West winds 5 to 10 knots. Bay waters smooth.
Sunday night..West winds around 5 knots becoming southwest after midnight. Bay waters smooth.
Monday..Southeast winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Bay waters smooth becoming slightly choppy in the afternoon.
Monday night and Tuesday..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Tuesday night..Southeast winds 5 to 10 knots. Bay waters smooth. Patchy fog in the late evening and overnight. A slight chance of showers after midnight.
Wednesday..Southeast winds 5 to 10 knots. Bay waters smooth. Patchy fog. A slight chance of showers.
Wednesday night..South winds around 10 knots. Bay waters smooth to slightly choppy. Patchy fog. A slight chance of showers.
Thursday..Southwest winds around 10 knots. Bay waters smooth to slightly choppy. Patchy fog. A slight chance of showers.
Thursday night..South winds 5 to 10 knots. Bay waters smooth. Patchy fog. A slight chance of showers early in the evening. A chance of showers in the late evening and overnight.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 927 Pm Cst Sat Jan 16 2021
Synopsis for high island to matagorda ship channel out 60 nm.. Light winds and low seas can be expected through Sunday night. High pressure moving off to the east will allow onshore winds to return to the area Sunday night and strengthen on Monday. Moderate onshore winds and elevated seas can be expected for much of the remainder of the week. There is also some potential for occasional sea fog formation Tuesday night through Friday morning before the arrival of the next cold front.


7 Day Forecast for Marine Location Near Katy, TX
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location: 29.79, -95.81     debug


Area Discussion for - Houston/Galveston, TX
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FXUS64 KHGX 170531 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 1131 PM CST Sat Jan 16 2021

AVIATION. VFR with light winds this evening and overnight. TAF sites will see increasing mid/high clouds tonight through tomorrow morning in association with a weak shortwave trough and approaching weak cold front. Winds will generally be W to NW under 10 knots during the day tomorrow. VFR tomorrow night and on into early Monday morning with light winds. Increasing clouds during the day on Monday with a return of and strengthening southeast winds. 42

PREV DISCUSSION . /ISSUED 325 PM CST Sat Jan 16 2021/

SHORT TERM [Through Monday] . Northwesterly winds continue to decrease as an area of high pressure moves in closer to the area. Still seeing a few bouts of wind gusts around 15 knots due to the steep low-level lapse rates and a unidirectional wind flow into the mid-levels. With winds slowing down going into the evening, dew points remaining low, and clear skies prevailing, another cold night is expected for tonight with temperatures dipping down into the mid-to-upper 30s. Dew points will remain on the low side with 20s persisting through Sunday morning. Temperatures will be on the rise going into early next week as CAA comes to an end on Sunday morning. Highs will be in the mid-to-upper 60s on Sunday and the upper 60s/low 70s on Monday. Low temperatures for Sunday night will be a bit warmer due to onshore flow returning as the high pressure begins to move off to the east. Expecting temperatures to be in the low-to-mid 40s for most with upper 30s for our far northern counties.

Forecast models are in agreement that a weak shortwave trough will swing through the CWA on early Sunday morning along with a weak cold front, but this will not cause any adverse weather or offer any noteworthy cold air. This is because the trough is positively tilted, instability is very low, PWATs are less than 0.5", plentiful dry air remains in the low-levels, and there will be quite a bit of upper-level convergence. At best we'll see some mid-to-upper level clouds as it moves through, but only last through late Sunday morning before clear skies return. The area of high pressure moves off to the east on late Sunday night/early Monday morning. This will put us into an onshore southeasterly flow, which is important for the rest of the week as this will steadily increase our moisture and instability. 26

LONG TERM [Monday Night Through Saturday] . A shallow cold front is fcst to move into portions of n/ncntl Tx Monday & Tuesday and become a focus for precipitation as llvl moisture levels increase from prevailing onshore winds off the Gulf. Anticipate that the boundary will stall before reaching southeast Texas with upper trof still being situated well to the west over SoCal & Baja. Disturbances embedded in the swly flow aloft along with the proximity of the stalled front may trigger sct precip at times across the NW 1/2 of the CWA Tues-Thurs. Further south closer to the coast, we'll be on the lookout for periods of sea fog. The upper trof to the west will fill as it ejects newd across the Plains later in the week. The next front penciled in for Thursday night into Friday afternoon, will probably have a better southward push. Sct precip along this boundary will come to an end as it pushes offshore later in the day. 47

MARINE . Although the wind speeds have decreased, the wind directions remains northwesterly which means the seas will continue to decrease going into Monday. The persistent offshore flow will allow for at least one more day of abnormally low tides for the bays. As a result, a Low Water Advisory is in effect for both Matagorda Bay and Galveston Bay through this evening. Winds will become light tonight as high pressure moves overhead. A weak cold front will briefly change winds to northwesterly on Sunday morning. High pressure moves off to the east on Sunday night/Monday morning, which will introduce an onshore southeasterly flow. Wind speeds will approach SCA criteria on Monday night/early Tuesday morning. The onshore flow will persist through most of the week and seas will build up to 4-7 feet by Tuesday. A warmer airmass will be moving over the cool nearshore waters, so sea fog will be a possibility Wednesday through Friday morning. 26

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 36 65 38 68 56 / 0 0 0 0 20 Houston (IAH) 37 65 41 67 53 / 0 0 0 0 20 Galveston (GLS) 47 61 53 63 58 / 0 0 0 0 10

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCHT2 - 8770777 - Manchester, TX 29 mi48 min W 1 G 1.9 46°F 54°F1018.2 hPa
MGPT2 - 8770613 - Morgans Point, TX 44 mi48 min WNW 2.9 G 2.9 50°F 53°F1018.5 hPa
EPTT2 - 8771013 - Eagle Point, TX 52 mi48 min WNW 2.9 G 4.1 46°F 52°F1018 hPa

Wind History for Morgans Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston Executive Airport, TX5 mi23 minN 010.00 miFair37°F32°F81%1019.3 hPa
Houston, Sugar Land Municipal / Hull Field Airport, TX14 mi25 minN 010.00 miFair38°F28°F68%1018.8 hPa
John Dunn Helistop, TX23 mi23 minNW 610.00 miA Few Clouds54°F16°F22%1017.9 hPa
Houston, Hooks Memorial Airport, TX24 mi25 minN 09.00 miFair36°F29°F76%1018.6 hPa

Link to 5 minute data for KTME

Wind History from TME (wind in knots)
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Last 24hrW6W6NW6CalmNW3NW5W5NW5W4NW7NW6NW6N6W9NW8
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1 day agoNW4NW4N4NW6NW5NW4NW5NW5NW5N10NW12
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2 days agoCalmSW4S4S4S3SW4SW5SW9SW6SW9SW14
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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 Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Sun -- 02:39 AM CST     0.36 feet High Tide
Sun -- 07:15 AM CST     Sunrise
Sun -- 08:16 AM CST     0.20 feet Low Tide
Sun -- 10:29 AM CST     Moonrise
Sun -- 11:57 AM CST     0.29 feet High Tide
Sun -- 05:45 PM CST     Sunset
Sun -- 07:37 PM CST     -0.37 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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0.20.30.30.40.30.30.30.20.20.20.20.30.30.30.20.1-0.1-0.2-0.3-0.4-0.4-0.3-0.2-0.1

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station



Gulf Stream Current



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