Sunday, March29, 2020
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Marine Weather and Tides
Bay City, 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 7:41PM Sunday March 29, 2020 12:20 PM CDT (17:20 UTC) Moonrise 9:32AMMoonset 11:32PM Illumination 31% 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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GMZ330 Matagorda Bay- 1032 Am Cdt Sun Mar 29 2020
This afternoon..Northeast winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and isolated Thunderstorms late in the afternoon.
Tonight..East winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers.
Monday..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and isolated Thunderstorms.
Monday night..South winds around 10 knots becoming southwest after midnight. Bay waters smooth to slightly choppy becoming smooth after midnight.
Tuesday..Northwest winds 5 to 10 knots becoming north in the afternoon. Bay waters smooth becoming smooth to slightly choppy in the afternoon.
Tuesday night..North winds around 10 knots becoming northeast after midnight. Bay waters smooth to slightly choppy becoming slightly choppy after midnight.
Wednesday..East winds 10 to 15 knots. Bay waters slightly choppy.
Wednesday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy.
Thursday..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A chance of showers and Thunderstorms.
Thursday night..Southeast winds 10 to 15 knots. Bay waters slightly choppy. A slight chance of showers and Thunderstorms.
GMZ300 Synopsis For High Island To The Matagorda Ship Channel Out 60 Nautical Miles Including Galveston And Matagorda Bays 1032 Am Cdt Sun Mar 29 2020
Synopsis for high island to matagorda ship channel out 60 nm.. Scec in effect for the nearshore and offshore waters through this evening due to winds of 15-20 knots and seas of 4-6 feet. Winds will become east during the day and onshore flow will return tonight and Monday as high pressure moves off to the east. Another cold front is currently expected to move off the coast sometime on Tuesday.


7 Day Forecast for Marine Location Near Bay City, TX
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location: 28.95, -95.94     debug


Area Discussion for - Houston/Galveston, TX
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FXUS64 KHGX 291143 CCA AFDHGX

Area Forecast Discussion . CORRECTED National Weather Service Houston/Galveston TX 643 AM CDT Sun Mar 29 2020

AVIATION.

Starting the day with VFR conditions. N winds becoming E at 5-10 KTS across all TAF sites, except LBX/GLS where winds will range 10-15 KTS. Moisture aloft will bring back cloud coverage late afternoon and tonight with MVFR decks developing overnight for the southern and central regions of the CWA and early Monday morning for the northern regions of the CWA. -SHRA possible over LBX/GLS after 00Z. Increasing rain chances expected across the rest of the CWA overnight and Monday as a warm front begins to move north from the northern Gulf of Mexico. 24

PREV DISCUSSION. /ISSUED 443 AM CDT Sun Mar 29 2020/

SHORT TERM [Today through Monday] .

Drier air mass filtered inland from the north northwest post FROPA last night with the last few showers over the coastal areas dissipating by around midnight CDT. GOES-16 TPW is currently showing values of 0.3-0.5 inches along the northern and central regions of the CWA and 0.8-1.3 inches along the southern regions and coastal waters. Most of the skies were clear past midnight, with the exception of the coastal regions, allowing for temperatures to cool down to the low to mid 50s along areas north of I-10, the low 60s along areas south of I-10, and the low 70s in Galveston.

Mostly clear skies and dry weather expected this morning, but south to southwest flow above 850 mb will return low level moisture and thus re-develop cloudy skies during the afternoon/evening hours. Showers expected across the local waters today moving into coastal regions tonight as the old frontal boundary transitions to a warm front and begins to shift north. Because the sounding model data is very dry at the low levels along the coastal regions this afternoon and through early tonight along the northern regions, kept PoPs at 20 percent or less. Conditions deteriorate overnight through Monday as the warm front continues to move northward across SE Texas, a surface low develops to our west and moves northeastward, and an upper level trough moves eastward across the lower Rockies. Strongest activity is expected to occur along areas north of I-10 in the evening/night hours, where SPC has a marginal risk of severe thunderstorms. Along these regions, sounding data shows moisture deepening in the late afternoon/evening hours, increasing CAPE values, SFC-6 KM shear of around 60 kts, negative LIs, and mid level lapse rates slightly above 7 C/km. 24

LONG TERM [Monday Night Through Saturday] .

Rains will be coming to an end from west to east Monday night through early Tuesday morning as a cold front moves through the area. High pressure building in behind the front will bring a dry forecast to the area for Tuesday and Wednesday with lows in the 50/60 and highs in the 70s/80s. As the high moves off to the east, onshore winds return to the area on Thursday and persist through Friday. A series of hard to time and fast eastward moving mid/upper level disturbances are expected to bring periods of showers and thunderstorms to the area on Thursday and Friday before the next cold front moves off the coast Friday night through early Saturday morning. As timing of these disturbances becomes more clear over the next several days, we will probably be raising area Thursday/Friday rain chances. On Saturday behind the front, some rains are expected to linger across parts of the area and high temperatures look to remain in the 70s. 42

MARINE .

Light northerly wind flow in place. As the high moves slowly east, winds shift to the east in the afternoon. The return of the front as a warm front on Monday will also mean the return of light/moderate onshore winds and isolated showers over the bays/coastal waters. The next cold front is expected to move over the local waters Tuesday. Light/moderate offshore winds return in the wake of the front and is expected to continue through early Wednesday. Southeasterly wind flow expected Wednesday night, strengthening Thursday and Friday along with a wet weather pattern. 24

PRELIMINARY POINT TEMPS/POPS. College Station (CLL) 79 63 79 60 76 / 10 20 80 40 0 Houston (IAH) 82 65 81 68 80 / 10 20 40 40 0 Galveston (GLS) 77 71 78 71 80 / 10 20 20 30 0

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

Short Term . 24 Long Term . 42 Aviation/Marine . 24


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
EMAT2 17 mi50 min ENE 18 G 22 76°F 75°F1019.2 hPa
SGNT2 21 mi50 min ENE 13 G 19 73°F 76°F1019.7 hPa
FCGT2 - 8772447 - USCG Freeport, TX 34 mi50 min ENE 12 G 19 75°F 72°F1020.6 hPa
FPST2 34 mi50 min NE 21 G 23 73°F 73°F1019.8 hPa
VCAT2 41 mi50 min E 15 G 19 75°F 71°F1019.7 hPa
MBET2 42 mi50 min E 15 G 20 73°F 73°F1018.6 hPa
PCNT2 - 8773701 - Matagorda Bay; Port O'Connor, TX 42 mi56 min 72°F 73°F1019.6 hPa
LUIT2 44 mi50 min ENE 16 G 20 73°F 73°F1021.6 hPa

Wind History for USCG Freeport, TX
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bay City, Bay City Municipal Airport, TX4 mi45 minENE 16 G 2110.00 miMostly Cloudy81°F46°F30%1020.3 hPa
Palacios Municipal Airport, TX23 mi27 minENE 18 G 2210.00 miOvercast and Breezy79°F42°F27%1019.4 hPa
Wharton, Wharton Regional Airport, TX24 mi45 minNE 10 G 1410.00 miPartly Cloudy77°F36°F23%1020.7 hPa

Link to 5 minute data for KBYY

Wind History from BYY (wind in knots)
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N7N6N5N3CalmCalmCalmCalmCalmN3CalmCalmCalmN4NE6NE7NE12
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Tide / Current Tables for Freeport Harbor, Texas
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Freeport Harbor
Click for Map
Sun -- 12:32 AM CDT     -0.11 feet Low Tide
Sun -- 07:13 AM CDT     Sunrise
Sun -- 09:14 AM CDT     1.36 feet High Tide
Sun -- 10:29 AM CDT     Moonrise
Sun -- 01:02 PM CDT     1.16 feet Low Tide
Sun -- 03:59 PM CDT     1.24 feet High Tide
Sun -- 07:38 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.1-0.100.20.50.70.91.11.31.41.31.31.21.21.21.21.21.21.110.90.70.40.2

Tide / Current Tables for Freeport Harbor, Texas (2)
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Freeport Harbor
Click for Map
Sun -- 12:23 AM CDT     0.17 feet Low Tide
Sun -- 07:13 AM CDT     Sunrise
Sun -- 09:15 AM CDT     1.62 feet High Tide
Sun -- 10:29 AM CDT     Moonrise
Sun -- 12:55 PM CDT     1.45 feet Low Tide
Sun -- 04:05 PM CDT     1.50 feet High Tide
Sun -- 07:38 PM CDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.20.30.50.711.21.41.61.61.61.51.51.41.51.51.51.51.41.31.20.90.70.4

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Houston/Galveston, TX (13,3,4,5)
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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.