Tuesday, December10, 2019
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Marine Weather and Tides
Dayton, TX

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:04AMSunset 5:22PM Tuesday December 10, 2019 3:45 PM CST (21:45 UTC) Moonrise 4:27PMMoonset 5:25AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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- 309 Pm Cst Tue Dec 10 2019
.small craft advisory in effect through late tonight...
Tonight..North winds 20 to 30 knots diminishing to 15 to 20 knots toward morning. Bay waters rough.
Wednesday..Northeast winds near 15 knots diminishing to 10 to 15 knots. Bay waters slightly choppy to choppy.
Wednesday night..Northeast winds 10 to 15 knots. Bay waters slightly choppy.
Thursday..Northeast winds 5 to 10 knots. Bay waters smooth.
Thursday night..Northeast winds 5 to 10 knots. Bay waters smooth.
Friday..North winds around 5 knots becoming southwest in the afternoon. Bay waters smooth.
Friday night..Southwest winds 5 to 10 knots. Bay waters smooth.
Saturday..West winds 5 to 10 knots becoming south in the afternoon. Bay waters smooth.
Saturday night..East winds 5 to 10 knots. Bay waters smooth.
Sunday..Southeast winds 5 to 10 knots. Bay waters smooth. A chance of showers and isolated Thunderstorms late in the afternoon.
Sunday night..South winds around 10 knots. Bay waters smooth to slightly choppy. A chance of showers.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 309 Pm Cst Tue Dec 10 2019
Synopsis for high island to matagorda ship channel out 60 nm.. Strong north winds and elevated seas can be expected overnight. Winds and seas will slowly begin diminishing late tonight and Wednesday. Mariners should expect low water conditions in the northern parts of the bays during the next low tide cycle. With high pressure situated over the eastern seaboard and lower pressure in the west central gulf, northeast to east winds will prevail through Friday. Onshore flow should resume late Saturday in advance of the next front expected Monday or Monday night.


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 102105 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 305 PM CST Tue Dec 10 2019

SHORT TERM (Tonight through Wednesday).

Ongoing band of showers should continue its gradual eastward push and should mostly be out of the CWA around sunset. Otherwise, the combination of continued cloudiness, wet ground and winds (albeit lighter overnight) should limit the overall temp fall. Trimmed the wind advisory to only be in effect closer to the coast where frequent 25-40mph gusts will be prevalent). As the mid level trof axis passes thru and column begins to dry, we should see gradual clearing skies during the morning hours Wed. 47

LONG TERM (Wednesday night through next Tuesday).

Thursday's northeasterly winds weaken and skies to remain clear per the region still being under the influence of northeastern surface ridging exiting into the U.S. Mid Atlantic. The resident cold air mass will be best felt Thursday morning; low to mid 30s across the northern tier to lower 50s along the immediate coast. A shortwave trough swinging across the Red River Valley Thursday and the passage of a weak longwave trough Friday will only fortify this resident cooler, drier air mass over Southeast Texas while keeping winds light and variable. Thursday's light northeast winds will veer around to the southwest Friday as temperatures fall back into the 40s shortly after sunset Thursday night/Friday morning . the afternoon to sluggishly warm into the 50s for a second afternoon in-a-row. Southwesterly winds will significantly increase Friday into the weekend's temperatures where days will quickly be back up into the 70s by Friday. Not anticipating the type of 80s warmth experienced yesterday over the dry weekend but, per mostly sunny skies and a moderate southerly wind on Sunday, more humid days will again warm back up into the areawide mid to upper 70s with morning readings coming in a couple of degrees on either side of 50 F going into early next week.

The next weather maker will be the next cold frontal passage in 6 days; Monday. The approach of this front will make for a warm, humid overcast Sunday with increasing interior light shower (sprinkle) chances commencing as early as Sunday afternoon . precipitation probabilities will increase to likely probs going through Monday morning and afternoon. The main difference with this frontal passage will be the development of more areal coverage thunderstorms. GFS prog soundings support enough mid-layer cooling to produce lower 3km 5 to 6 C lapse rates in tandem with lowering shear through the warmth of the day . under 15 knots in the lower few kilometers when the best thermodynamics and frontal forcing comes through during the day. Whether the best thermo/shear are in phase (or not), there will likely still be more widespread thunder with Monday's convection. A cool, wet day Monday will lead to a chilly morning in the mid 30s (north) to mid 40s at the coast with gradually clearing skies Tuesday morning. Tuesday will be a winter-like day; stout north winds as full bore cold air advection keeps the mostly sunny day in the nippy 50s. 31

Aviation (18Z TAFs).

Ceilings should continue holding in the 600-1600ft range for much of the afternoon as another band of shra makes its way across the area from the west. Precip should be tapering off along the I-45 terminals 22-24z. Gusty north winds will persist into the evening before beginning a slow downward trend inland, but remain up at the coast overnight. Moisture trapped under the inversion should keep ceilings between 1500-2500ft thru the night. Once the upper trof axis pushes east of the area and mixing/column drying occurs Wed morning we'll see skies gradually clear out. 47

MARINE.

Strong northerly winds and elevated seas will persist overnight. Will keep current advsy/gale flags in place going into the overnight hours then hopefully begin downgrading after midnight and into Wed as speeds/seas begin to slowly diminish. Water levels in northern parts of the bays are currently behaving themselves . and will be going into high tide in the next 6-8 hours. The next couple shifts may need to monitor for a short duration low water advisory as we head into low tide Wed morning and water levels bottom out.

Broad high pressure over the eastern seaboard and troffiness across the Yucatan and wcntl Gulf will maintain ne/e flow thru Fri. A more prevalent onshore flow resumes late Sat and persists until the next front pushes off the coast Mon or Mon night. 47

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 37 58 35 58 37 / 10 0 0 0 0 Houston (IAH) 40 57 39 59 43 / 10 0 0 10 10 Galveston (GLS) 46 56 50 59 53 / 20 0 0 10 20

HGX WATCHES/WARNINGS/ADVISORIES. TX . Wind Advisory until 9 PM CST this evening for the following zones: Chambers . Coastal Brazoria . Coastal Galveston . Coastal Harris . Coastal Jackson . Coastal Matagorda.

Small Craft Advisory until 3 AM CST Wednesday for the following zones: Galveston Island and Bolivar Peninsula . Matagorda Islands.

Wind Advisory until 3 AM CST Wednesday for the following zones: Brazoria Islands . Galveston Island and Bolivar Peninsula . Matagorda Islands.

Gale Warning until midnight CST tonight for the following zones: Brazoria Islands.

GM . Small Craft Advisory until 3 AM CST Wednesday for the following zones: Galveston Bay . Matagorda Bay.

Gale Warning until midnight CST tonight for the following zones: Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM . Coastal waters from High Island to Freeport TX out 20 NM . Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM . Waters from High Island to Freeport TX from 20 to 60 NM.

Small Craft Advisory from midnight tonight to 3 AM CST Wednesday for the following zones: Coastal waters from Freeport to Matagorda Ship Channel TX out 20 NM . Coastal waters from High Island to Freeport TX out 20 NM . Waters from Freeport to Matagorda Ship Channel TX from 20 to 60 NM . Waters from High Island to Freeport TX from 20 to 60 NM.



Short/Aviation/Marine . 47 Long/Fire . 31


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGPT2 - 8770613 - Morgans Point, TX 30 mi51 min NNE 16 G 19 52°F 65°F1021.5 hPa
NCHT2 - 8770777 - Manchester, TX 30 mi51 min NNE 9.9 G 14 51°F 66°F1021.2 hPa
EPTT2 - 8771013 - Eagle Point, TX 44 mi51 min NNE 24 G 31 55°F 64°F1020.2 hPa
HIST2 48 mi51 min NNE 16 G 19 51°F 63°F1020.4 hPa
RLOT2 - 8770971 - Rollover Pass, TX 49 mi51 min NE 19 G 24 52°F 60°F1020.7 hPa

Wind History for Morgans Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cleveland, TX17 mi71 minNNE 410.00 miLight Rain49°F46°F92%1022.3 hPa
Houston Intercontinental Airport, TX21 mi53 minN 137.00 miLight Rain51°F46°F86%1022.3 hPa

Link to 5 minute data for K6R3

Wind History from 6R3 (wind in knots)
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Last 24hrCalmCalmCalmCalmS3CalmCalmCalmCalmN9
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1 day agoS4S5S5S4CalmS3CalmCalmCalmCalmS4S5CalmCalmS5S5S4SW5SW6SW4W7SW6SW6Calm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3S4S3S5S5S3

Tide / Current Tables for Lynchburg Landing, San Jacinto River, Texas
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Lynchburg Landing
Click for Map
Tue -- 05:24 AM CST     Moonset
Tue -- 07:04 AM CST     Sunrise
Tue -- 01:52 PM CST     -0.03 feet Low Tide
Tue -- 04:27 PM CST     Moonrise
Tue -- 05:21 PM CST     Sunset
Tue -- 11:11 PM CST     1.41 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.21.21.11.11.110.90.80.60.40.30.10-000.20.40.70.91.11.31.41.4

Tide / Current Tables for Point Barrow, Trinity Bay, Texas
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Point Barrow
Click for Map
Tue -- 01:06 AM CST     0.80 feet Low Tide
Tue -- 05:23 AM CST     Moonset
Tue -- 06:38 AM CST     0.92 feet High Tide
Tue -- 07:03 AM CST     Sunrise
Tue -- 01:13 PM CST     -0.14 feet Low Tide
Tue -- 04:26 PM CST     Moonrise
Tue -- 05:20 PM CST     Sunset
Tue -- 10:20 PM CST     1.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.80.80.80.90.90.90.90.80.70.40.2-0-0.1-0.1-00.10.30.50.70.911.11

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
Wind Forecast for Houston/Galveston, TX (16,3,4,5)
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Ground Weather Radar Station Houston/Galveston, TX
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Gulf Stream Current


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