Sunday, July12, 2020
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Marine Weather and Tides
Terrell Hills, 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 6:41AMSunset 8:37PM Sunday July 12, 2020 5:33 PM CDT (22:33 UTC) Moonrise 12:05AMMoonset 12:31PM Illumination 50% Phase: Third Quarter Moon; Moon at 22 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 Terrell Hills, TX
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location: 29.46, -98.46     debug


Area Discussion for - Austin/San Antonio, TX
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FXUS64 KEWX 121951 AFDEWX

Area Forecast Discussion National Weather Service Austin/San Antonio TX 251 PM CDT Sun Jul 12 2020

SHORT TERM (Tonight through Monday Night). As discussed in the morning update, the morning cirrus debris, slightly higher dew points, and temporary northeast wind shift that occurred in the northern CWA, stunted temperature trends across some portions of central and eastern areas of the CWA. We are finally seeing a rebound mid afternoon, although dew points are still elevated. We should see a record high temperature for this date later at Del Rio and possible San Antonio.

Continued hot and dry conditions through the short term as the strong 595 decameter 500mb ridge remains centered just northwest of the region. For several runs models it has been indicated that Monday would eventually be the warmest day of this heat event for many areas, and the 12Z runs have not changed. 850mb temps and 1000- 500mb thickness values look to peak over the region tomorrow. We have followed closer to the NBM for max temperatures for Monday, which has been, for our region at least, the better model guidance, especially for those drought stressed areas. The two things to watch carefully, that might keep temperatures slightly cooler than advertised, would be potential cirrus debris with any upstream convection again overnight and dew points not mixing out as low as advertised.

With that said, we are forecasting record heat for the date tomorrow for most areas. Locations along the Rio Grande, like Del Rio, could make a run for all time max temperature records. While technically not meeting Excessive Heat Warning criteria for western areas, we have elected to expand the Excessive Heat Warning southwest into the Rio Grande region for Monday. We have also expanded into the Hill Country as some locations could be at criteria. This should help with messaging Monday being the peek of the heat, for some locations near or at July record highs, and for Del Rio possibly near or at and all time record high (112 in 1988).

The message for all of South-Central Texas, regardless of in a Heat Advisory or Excessive Heat Warning, will continue to be that dangerous heat is occurring which could cause heat related illness for those not taking proper precautions highlighted below.

Heat Messaging: - Stay hydrated and take frequent breaks in the shade or air conditioning - Limit strenuous outdoor activities - Check on elderly and those without air conditioning - Never leave children or pets unattended in vehicles

CLIMATE. Daily Max Temperature Records . Jul 12 . Jul 13 . Jul 14 Austin . 107 (1954) .105 (2013). 108 (1925) Austin/Bergstrom . 106 (1954) .104 (2013). 105 (2000) San Antonio . 103 (1988) .102 (2013). 102 (2009) Del Rio . 107 (1998) .106 (1998). 107 (1998)

July Max Temperature Records Austin . 110 (2018) Austin/Bergstrom . 109 (2018) San Antonio . 106 (1989) Del Rio . 111 (1960)

LONG TERM (Tuesday through Sunday). High pressure ridge is forecast to dominate the weather forecast conditions through the extended forecast period. For sure, the two weather conditions that will persist for this time frame is the heat and a dry pattern. Dangerous heat weather conditions are expected once again on Tuesday with high temperatures reaching the 100 to 110 degree mark and similar values for the heat indices. It is likely that most areas across South Central Texas ends up under a Heat Advisory with portions of the area under an Excessive Heat Warning. All this to say that it is going to be hot everywhere across the local area. The heat safety message continues and that is to protect yourself and others from the impacts of this heat wave by staying hydrated and take frequent breaks in the shade or air conditioning if you are conducting any activity outdoors. For more details on this, please check our homepage at weather.gov/ewx.

By Wednesday, the heat relaxes a bit (we are referring 1 to 5 degrees for most places versus the Tuesday's highs) as the high pressure ridge weakens with the passage of an upper short wave disturbance across north Texas. The pattern changes very little on Thursday and therefore, similar conditions are expected with highs in the upper 90s and up to 103 degrees along the Rio Grande.

By Friday, the high pressure ridge continues to weaken as the center of the system moves over the Texas Panhandle and an upper level inverted short wave travels from east to west across the coastal plains. This translates to similar conditions to the those expected on Thursday with even a degree or two cooler over some areas.

Not a whole lot of changes for the upcoming weekend as the high pressure ridge still in control over the local weather with very little opportunity to see rain and elevated chances for the heat wave to remain.

PRELIMINARY POINT TEMPS/POPS. Austin Camp Mabry 79 106 77 103 76 / 0 0 0 0 0 Austin Bergstrom Intl Airport 76 105 76 103 76 / 0 0 0 0 0 New Braunfels Muni Airport 75 106 74 103 75 / 0 0 0 0 0 Burnet Muni Airport 75 104 76 103 74 / 0 0 0 0 0 Del Rio Intl Airport 81 111 81 111 79 / 0 0 0 0 0 Georgetown Muni Airport 77 105 76 104 76 / 0 0 0 0 0 Hondo Muni Airport 74 107 75 107 75 / 0 0 0 0 0 San Marcos Muni Airport 75 106 75 104 75 / 0 0 0 0 0 La Grange - Fayette Regional 77 104 77 104 78 / 0 0 0 0 0 San Antonio Intl Airport 78 106 77 105 76 / 0 0 0 0 0 Stinson Muni Airport 76 106 76 105 76 / 0 0 0 0 0

EWX WATCHES/WARNINGS/ADVISORIES. Excessive Heat Warning until 8 PM CDT Monday for Atascosa-Bandera- Bastrop-Bexar-Blanco-Burnet-Caldwell-Comal-Dimmit-Edwards-Frio- Gillespie-Gonzales-Guadalupe-Hays-Karnes-Kendall-Kerr-Kinney-Llano- Maverick-Medina-Real-Travis-Uvalde-Val Verde-Williamson-Wilson- Zavala.

Heat Advisory until 8 PM CDT Monday for De Witt-Fayette-Lavaca-Lee.



Short-Term/Aviation . Runyen Long-Term . 17 Decision Support . KCW


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Antonio, San Antonio International Airport, TX6 mi43 minSE 510.00 miA Few Clouds100°F64°F32%1010 hPa
San Antonio - Kelly Field, TX8 mi38 minSSW 310.00 miPartly Cloudy101°F65°F31%1010.2 hPa
San Antonio, Stinson Municipal Airport, TX9 mi41 minSSE 610.00 miFair100°F64°F31%1009.3 hPa
Randolph Air Force Base, TX11 mi38 minS 710.00 miFair101°F63°F29%1010.5 hPa
Castroville Municipal Airport, TX22 mi59 minN 010.00 miFair103°F58°F23%1012.5 hPa
San Antonio Boerne Stage Field, TX22 mi39 minSSW 410.00 miFair97°F55°F25%1013.5 hPa

Link to 5 minute data for KSAT

Wind History from SAT (wind in knots)
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Last 24hrS7SE6SE9SE9SE11S11S9S11S10S8S9S5S8S7S3S45SE4S5S5S7Calm5SE5
1 day agoS10SE14SE15
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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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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 (18,4,5,8)
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Ground Weather Radar Station Austin/San Antonio, TX
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Disclaimer:
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.