Wednesday, January22, 2020
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Marine Weather and Tides
China Grove, 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 7:26AMSunset 6:04PM Wednesday January 22, 2020 2:50 AM CST (08:50 UTC) Moonrise 5:40AMMoonset 4:10PM Illumination 8% Phase: Waning Crescent; Moon at 27 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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7 Day Forecast for Marine Location Near China Grove, TX
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location: 29.4, -98.4     debug


Area Discussion for - Austin/San Antonio, TX
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FXUS64 KEWX 220451 AFDEWX

Area Forecast Discussion National Weather Service Austin/San Antonio TX 1051 PM CST Tue Jan 21 2020

AVIATION (06Z Aviation).

As an upper level disturbance approaches the region from the northwest and southeasterly surface flow increases moisture, ceilings continue to lower. MVFR cigs have already developed at KSAT at 04Z and the rest of the TAF sites are not far behind. Conditions will deteriorate through the early morning hours with IFR cigs expected before sunrise. LIFR ceilings look increasingly likely to impact all sites during the daytime, and fog development will also lower visibilities at times. Models have gone more pessimistic with the fog potential, and it now appears that IFR vsby conditions Wednesday are possible at all sites. Occasional LIFR visibility at the I-35 sites cannot be ruled out. In addition, rain showers will increase in coverage and intensity from 06-10Z, and though most of the activity will end by sunrise at DRT, showers will continue into Wednesday evening along the I-35 corridor. TSRA remains unlikely but not completely out of the question in the afternoon. Skies should begin to clear at the end of the period at KDRT, however improvement will be slow elsewhere with IFR and perhaps LIFR conditions carrying into Wednesday night.

PREV DISCUSSION . /ISSUED 212 PM CST Tue Jan 21 2020/

SHORT TERM (Tonight through Wednesday Night) . Clouds today have begun streaming in from the west creating a mix of clouds and sun through the afternoon hours. This cloud cover is the sign of the approaching pair of upper level shortwaves that are embedded in a large upper level Pacific trough. The lead shortwave is evident on GOES water vapor over Western New Mexico which lines up well with the position in the 12z suite of models. The shortwave will rapidly approach Texas this evening into tonight. The height falls and lift associated with the disturbance will be enough to spark off widespread light to moderate rain. With dewpoints in the 30s currently some of the rain across the west main not initially reach the ground, but as the atmosphere moistens and the rain spreads eastward overnight rain chances ramp up area wide from midnight tonight through the day tomorrow.

The surface trough which has been advertised for the last few days in the NAM continues to trend further south over Matagorda Bay which should keep the threat for stronger thunderstorms confined to areas off shore. As the surface low pressure, associated with the upper trough, moves across North Texas Wednesday evening into Wednesday night there should be sufficient lift and decent lapse rates which could spark off a few isolated thunderstorms for Wednesday afternoon into Wednesday night as the rain begins to push east of I-35.

Timing wise light rain will start across the west late this evening, reaching the I-35 corridor around or shortly after midnight. The light to moderate rain will continue across most of the area during the early morning hours through about noon on Wednesday before it begins shifting east as the second upper level shortwave arrives. Tomorrow afternoon the rain will begin to shift eastward, focusing along and east of US HWY 281. This is the window for a few isolated storms before the precipitation pushes to the east of the area overnight Wednesday into Thursday. All told areas of the Rio Grande Plains that need the most rain may only seen 1/4 of an inch while up to an inch is possible along and east of I-35. The greatest chance for rain will be along the Coastal Plains, closer to the coastal trough. 1 and 1/4 inches is possible in these areas and WPC has continued their marginal risk of excessive rainfall. The heaviest rainfall should be concentrated right along the coast and out of our area. In addition to the shower activity patchy fog will be possible Wednesday morning and through the day, but at this time no dense fog is expected with visibility only down to about 2 miles at its lowest.

Lows tonight and Wednesday night will run about 5-10 degrees above normal, but afternoon highs on Wednesday with the cloud cover, rain, and patchy fog will run near seasonal normals.

LONG TERM (Thursday through Tuesday) . The upper trough will continue to move across Texas Thursday and the flow will become northwesterly. A surface high will move into Central Texas and winds will be northerly Thursday and Thursday night. Sunny skies Thursday will warm temperatures to above normal. Clear skies and light winds Thursday night will allow for good radiational cooling and near normal lows Friday morning. The upper flow will become nearly zonal by Friday. The surface high will move off to the east turning the winds to the southeast bringing warmer, moister air back to the region. An old frontal boundary will move back northward through South Texas Saturday night and along with an upper shortwave trough will bring low chances for rain to the southern and eastern parts of our CWA Saturday night and Sunday. An upper ridge will build over the Southern Plains Monday. Tuesday a Pacific cold front will move into the region bringing the next chance for rain and isolated thunderstorms.

PRELIMINARY POINT TEMPS/POPS. Austin Camp Mabry 46 55 50 63 41 / 90 90 30 0 0 Austin Bergstrom Intl Airport 45 56 49 65 39 / 90 100 40 0 0 New Braunfels Muni Airport 48 58 51 66 41 / 90 100 20 0 0 Burnet Muni Airport 45 54 46 61 37 / 90 90 10 0 0 Del Rio Intl Airport 52 67 48 69 41 / 70 20 0 0 0 Georgetown Muni Airport 43 53 47 62 38 / 90 90 40 0 0 Hondo Muni Airport 51 61 49 70 40 / 90 90 10 0 0 San Marcos Muni Airport 47 57 49 66 39 / 90 100 30 0 0 La Grange - Fayette Regional 47 58 53 66 41 / 80 100 70 - 0 San Antonio Intl Airport 50 59 51 67 43 / 90 100 10 0 0 Stinson Muni Airport 51 61 52 68 43 / 90 100 10 0 0

EWX WATCHES/WARNINGS/ADVISORIES. None.

Short-Term/Aviation . KCW Long-Term . 17


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Antonio, Stinson Municipal Airport, TX6 mi58 minE 33.00 miLight Rain Fog/Mist49°F48°F100%1021.8 hPa
San Antonio, San Antonio International Airport, TX10 mi60 minE 44.00 miLight Rain Fog/Mist50°F46°F89%1021.4 hPa
San Antonio - Kelly Field, TX10 mi1.9 hrsE 54.00 miLight Drizzle Fog/Mist51°F47°F87%1021.9 hPa
Randolph Air Force Base, TX12 mi55 minE 54.00 miLight Drizzle Fog/Mist49°F48°F98%1022.2 hPa
Castroville Municipal Airport, TX24 mi76 minE 33.00 miDrizzle53°F52°F99%1023 hPa

Link to 5 minute data for KSSF

Wind History from SSF (wind in knots)
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Last 24hrCalmCalmCalmCalmE4E5SE7SE9SE8SE11SE11SE13
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1 day agoN5CalmN4N4N3N3NE6NE7E8E7NE533S3CalmE3E4E3CalmCalmCalmCalmE3Calm
2 days agoNE9
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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 Austin/San Antonio, TX (3,6,7,8)
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Ground Weather Radar Station Austin/San Antonio, TX
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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.