Sunday, April18, 2021
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Marine Weather and Tides
Rosenberg, TX

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:51AMSunset 7:53PM Sunday April 18, 2021 12:29 AM CDT (05:29 UTC) Moonrise 10:19AMMoonset 12:02AM Illumination 37% Phase: Waxing Crescent; Moon at 6 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- 1009 Pm Cdt Sat Apr 17 2021
.small craft should exercise caution...
Rest of tonight..North winds 15 to 20 knots. Bay waters choppy. A slight chance of showers.
Sunday..North winds 15 to 20 knots decreasing to around 10 knots in the afternoon. Bay waters choppy becoming smooth to slightly choppy in the afternoon. A slight chance of showers in the afternoon.
Sunday night..Northeast winds 10 to 15 knots. Bay waters slightly choppy.
Monday..Northeast winds 10 to 15 knots becoming east 5 to 10 knots in the afternoon. Bay waters slightly choppy becoming smooth in the afternoon.
Monday night..Southeast winds 5 to 10 knots becoming northeast after midnight. Bay waters smooth. A slight chance of showers in the evening.
Tuesday..North winds around 5 knots becoming southeast in the afternoon. Bay waters smooth.
Tuesday night..Northwest winds 10 to 15 knots becoming north 15 to 20 knots after midnight. Bay waters slightly choppy becoming choppy after midnight.
Wednesday..North winds 15 to 20 knots becoming northeast around 10 knots in the afternoon. Bay waters choppy becoming smooth to slightly choppy in the afternoon.
Wednesday night..East winds 10 to 15 knots. Bay waters slightly choppy.
Thursday..East winds 10 to 15 knots becoming southeast 15 to 20 knots in the afternoon. Bay waters slightly choppy becoming choppy in the afternoon.
Thursday night..Southeast winds 15 to 20 knots. Bay waters choppy. A slight chance of showers in the evening, then a chance of showers and a slight chance of Thunderstorms after midnight.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 1009 Pm Cdt Sat Apr 17 2021
Synopsis for high island to matagorda ship channel out 60 nm.. High pressure will build into west texas on Sunday and the pressure gradient will begin to relax. Strong north to northeast winds will begin to diminish on Sunday. Light to moderate northeast winds are expected Sunday night into Monday as the surface high drifts over southeast texas. The high will be east of the region by Monday evening and winds will veer to the east Monday night and southeast by Tuesday. Another cold front will cross the coastal waters Tuesday night.


7 Day Forecast for Marine Location Near Rosenberg, TX
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location: 29.55, -95.82     debug


Area Discussion for - Houston/Galveston, TX
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FXUS64 KHGX 180435 AFDHGX

Area Forecast Discussion National Weather Service Houston/Galveston TX 1135 PM CDT Sat Apr 17 2021

AVIATION [06Z TAF Issuance].

Precipitation finally moving out to the east. Otherwise, still keep- ing with a mostly VFR forecast for this TAF package despite the BKN and OVC high clouds lingering across the region. North winds should pick up a bit once again late tomorrow/Sun morning (10-15mph) . but will decrease once again tomorrow/Sun night as high pressure builds over the state. 41

PREV DISCUSSION. /ISSUED 318 PM CDT Sat Apr 17 2021/

SHORT TERM [Through Sunday Night] .

Latest radar display shows showers strengthening and moving northeast from our southwest counties. This activity is in response to a weak shortwave moving over the Gulf waters. Inland locations are only seeing showers, though a few rumbles of thunder cannot be ruled out through late this afternoon. Scattered thunderstorms will remain well offshore. Showers and storms should taper off/move eastward by early this evening.

Surface high pressure currently across the southern Rockies builds in across TX tonight, and will dominate the weather through the rest of the short-term period. Below normal temperatures, light north to northeast winds, low humidity and partly cloudy skies will prevail on Sunday. However, spotty showers/very light rain cannot be ruled out in the afternoon as weak vort max/shortwaves ride along the zonal flow aloft.

With cooler air in place and a reinforced 850 hPa high pressure in the Plains, afternoon temperatures will only climb into the upper 60s to low 70s. These forecast high temperatures will be around 10 degrees below average for this time of year. Below normal temperatures are also expected tonight and tomorrow night with lows from the mid 40s (far inland) into the upper 50s (along the coast).

LONG TERM [Monday Through Saturday] .

Monday morning looks to open with our area between an upper trough in the northern stream having passed us, and a strong shortwave trough set to roll across Texas. At the surface, we should still be the under the influence of high pressure, which will likely take a lot of the steam out of said shortwave, as that should pretty solidly keep us from building much deep moisture. Much like what we've seen today, enough moisture aloft could result in some virga or very, very light rain showers on and off. The main impact of the shortwave though, is likely to be increasing clouds keeping the temperatures down Monday afternoon.

The bulk of the rest of the week should be spent underneath zonal flow, until another upper trough rolls through Saturday. Despite that, it's still early enough in the year that we'll get interference from northern stream disturbances, and that's just what we'll look for on Tuesday night as a surface low scooting across the Great Lakes will drag a cold front all the way down into Texas. This should be shoved through the area pretty easily with a 1030ish high behind it providing plenty of offshore gradient on the backside. But, between the lack of onshore flow and Monday's upper trough, this should be a dry frontal passage.

Beyond that, however, the zonal flow should keep things pretty quiet until the weekend. Look for onshore flow to return Thursday, which should help support a gradual warmup after Tuesday night's front cools things down a bit. Of course, the switch back to southeast winds will also bring in higher humidity, and with that we can look for gradually increased sky cover culminating in a frontal passage on Friday night.

That pat explanation does do a bit of cover for some of the details, which are up for much more discussion. If things were to favor something more like the Euro, we can probably expect something a little more "typical", with a surface low spinning up over the Red River Valley, and its cold front sweeping through with showers and thunderstorms along the boundary. But, it only takes a look at the GFS to see another somewhat common springtime outcome: the trough digs deeper, induces a coastal trough, and that can spell some big rains.

If one were to take the deterministic GFS literally, it paints a 6 inch bullseye just to our east along the Louisiana coast. Of course, we don't want to get too tied up in the specifics of a deterministic forecast - this is a 7-8 day forecast, after all. But it does show that if we get a coastal trough solution, some big rains in the general region are possible. Looking at the NBM profile, there is roughly a 25 percent chance of exceeding an inch of rain at IAH, HOU and GLS on Friday and about a 5 percent chance of exceeding three inches. Certainly not the most likely outcome, but a solid rain to open the weekend is certainly something to keep an eye out for.

MARINE .

Difficult to dangerous marine conditions will prevail across the bays and Gulf waters this afternoon and evening with strong north winds and scattered showers and thunderstorms. Showers and storms should gradually taper off early this evening. However, winds will remain moderate to strong and seas elevated through Sunday. Small Craft Advisories remain in effect until 7PM across the bays and until 1AM for our Gulf waters. While conditions will gradually improve by Sunday afternoon, Small Craft Should Exercise Caution conditions may still be needed through Sunday night.

Monday through Tuesday, light to moderate northeast to east winds is expected ahead of the next dry-frontal passage arriving on Tuesday night. Moderate onshore flow develops after Wednesday as a surface high builds in across central/southern CONUS. This will result in stronger winds and elevated seas into the weekend. Caution Flags or Advisory conditions may be needed at times throughout the week. The next best chance for precipitation arrives Friday and Saturday.

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 46 69 47 74 50 / 20 10 0 10 10 Houston (IAH) 51 70 52 74 53 / 20 10 0 10 10 Galveston (GLS) 59 71 61 72 62 / 50 20 0 10 10

HGX WATCHES/WARNINGS/ADVISORIES. TX . NONE. GM . Small Craft Advisory until 5 AM CDT Sunday 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.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCHT2 - 8770777 - Manchester, TX 32 mi113 min N 11 G 15 57°F 74°F1018.1 hPa
MGPT2 - 8770613 - Morgans Point, TX 45 mi59 min N 11 G 18 56°F 69°F1018.9 hPa
EPTT2 - 8771013 - Eagle Point, TX 48 mi59 min N 12 G 15 58°F 67°F1017.9 hPa
LUIT2 49 mi59 min N 21 G 24 60°F 66°F1017.3 hPa

Wind History for Morgans Point, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Houston, Sugar Land Municipal / Hull Field Airport, TX10 mi36 minNNE 11 G 2010.00 miMostly Cloudy58°F47°F67%1018.9 hPa
Houston Executive Airport, TX18 mi34 minN 610.00 miPartly Cloudy54°F50°F88%1020 hPa
Houston Southwest Airport, TX18 mi34 minNNE 9 G 1410.00 miOvercast57°F49°F74%1019.3 hPa

Link to 5 minute data for KSGR

Wind History from SGR (wind in knots)
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1 day agoE9E8E5E12E7E9E7--E8E8E10E9E6SE5E5--E6NE4N8N7N9N10N11N10
2 days agoE7N6NE8NE7NE8N13NE13NE10NE12NE8NE8NE8NE9NE16
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E8SE7E9NE6E7E9E12

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas
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Clear Lake
Click for Map
Sun -- 12:59 AM CDT     Moonset
Sun -- 06:50 AM CDT     Sunrise
Sun -- 08:49 AM CDT     -0.07 feet Low Tide
Sun -- 11:16 AM CDT     Moonrise
Sun -- 07:49 PM CDT     Sunset
Sun -- 08:39 PM CDT     0.76 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.60.50.40.20.10-0.1-0.1-000.10.20.40.50.60.70.70.80.80.80.80.7

Tide / Current Tables for Clear Lake, Harris Co. Park, Texas (2)
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Clear Lake
Click for Map
Sun -- 12:59 AM CDT     Moonset
Sun -- 06:50 AM CDT     Sunrise
Sun -- 09:07 AM CDT     0.09 feet Low Tide
Sun -- 11:16 AM CDT     Moonrise
Sun -- 06:35 PM CDT     0.94 feet High Tide
Sun -- 07:49 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.80.70.70.60.40.30.20.10.10.10.20.30.40.60.70.80.90.90.90.90.90.90.9

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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