Friday, August14, 2020
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Marine Weather and Tides
Castle 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 7:00AMSunset 8:16PM Friday August 14, 2020 1:15 PM CDT (18:15 UTC) Moonrise 1:31AMMoonset 3:52PM Illumination 18% Phase: Waning Crescent; Moon at 25 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 Castle Hills, TX
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location: 29.51, -98.53     debug


Area Discussion for - Austin/San Antonio, TX
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FXUS64 KEWX 141756 AAA AFDEWX

Area Forecast Discussion . UPDATED National Weather Service Austin/San Antonio TX 1256 PM CDT Fri Aug 14 2020

AVIATION. /18Z TAFS/ VFR conditions are expected across the area terminals through the forecast period for the most part. South to southwest winds will persist through tonight around 10 knots along the I-35 sites with gusts up to 18 knots. For KDRT, a southeast to east wind flow will prevail through the forecast cycle. Low clouds are expected to develop late tonight across the Coastal Plains area and then push to the north toward the I-35 airports. At this time, these clouds should stay scattered in nature through the morning period before they dissipate. Can't rule out an hour or two of MVFR to the south or nearby the San Antonio area terminals around the 11z to 14z time period.

PREV DISCUSSION. /ISSUED 1111 AM CDT Fri Aug 14 2020/

UPDATE . Weather forecast is on track through tonight based on current observations and projected conditions for the first forecast period. Expect another hot and dry day with high temperatures ranging from 100 to 106 degrees with heat index values up to 111 degrees. A Heat Advisory is in effect across most areas through 7 PM this evening and again on Saturday through 7 PM with the exception of the Rio Grande area. With expected higher temperatures for Saturday, an Excessive Heat Warning may be needed for some locations. We will be coordinating on this effort with neighbor offices and bring you the latest information during the afternoon forecast package.

PREV DISCUSSION . /ISSUED 606 AM CDT Fri Aug 14 2020/

AVIATION . Patches of MVFR stratus have developed right along the I-35 corridor from SAT to BAZ to HYI and AUS. Based on this have introduce TEMPO BKN MVFR into the SAT/SSF and AUS TAFs for the next few hours (until 15z). Otherwise expect the generally VFR skies to continue. Winds have decreased overnight, but should pick up again out of the south and southwest by the late morning hours today. While breezy conditions are possible across all of South Central Texas, DRT should see the most gusts through the day.

PREV DISCUSSION . /ISSUED 303 AM CDT Fri Aug 14 2020/

SHORT TERM (Today through Saturday) . Upper level high pressure is currently centered across New Mexico, extending from Arizona to Texas. Surface high pressure continues to dominate the Gulf of Mexico with our winds more out of the south and southwest, rather than southeasterly off the Gulf. Looking at the NAEFS the upper level ridge is decently strong (99th percentile at 500 mb), but what is significant and similar to our last heat wave earlier this summer is the 700mb and 850 mb temperatures, which are currently forecast to be between the 99.5 percentile and max observed across the state, especially on Saturday.

The strong upper level ridge will translate to continued hot and dry weather through Saturday. While no records were broken on Thursday, record highs at most of our climate sites are in jeopardy on Friday, with records at all of the sites likely in danger on Saturday. Based on the forecast highs/heat indices no changes will be made at this time to the ongoing heat advisory which will include most of the area, with the exception of the Rio Grande Plains, beginning this afternoon (criteria for the Rio Grande Plains is 110 for either ambient temperature or heat index which is not forecast to be met at this time). Under mostly sunny skies today and tomorrow the hottest temperatures will center around the I-35 corridor, the Coastal Plains, and Rio Grande Plains, with the Hill Country and Edwards Plateau slightly cooler. Highs in these areas both days will come close to or exceed the 103 ambient temperature criteria, with heat index values for Saturday expected to exceed the 108 degree criteria. There may also be a few spots that flirt with the criteria for an excessive heat warning on Saturday as well. Will let the afternoon forecast package address any changes to the heat headlines. Subsidence from the upper level and surface ridges will squash any chance for precipitation. One important item of note is that the heat and continued dry conditions have led to fuels drying out across South Central Texas. Coupled with the breezy south and southwest winds each afternoon there has been an uptick in grass fires across the area. Be mindful of the increased risk of grass fires. Overnight lows tonight into Saturday will run in the mid to upper 70s.

CLIMATE . Record High Temperatures and year of most recent occurrence 8/14 8/15 ---------- --------- Austin Bergstrom 104 (1956) 104 (1956) Austin Camp Mabry 107 (2013) 105 (2011) San Antonio 103 (2013) 102 (2013) Del Rio 106 (2015) 105 (2001)

LONG TERM (Saturday Night through Thursday) . The portion of the Subtropical Ridge over Texas weakens going into Sunday as an upper level trough deepens along or just east of the Mississippi Valley while a weak cold front lingers over northwestern Texas. The thermal ridge remains over our area with little change to the high temperatures on Sunday. The Heat Advisory will likely be extended into Sunday and similar to Saturday, a few spots may flirt with Excessive Heat criteria. Isolated to widely scattered showers and thunderstorms should develop along the front during the day and then move south into the Hill Country and our Central Texas counties late in the afternoon or more likely in the evening into overnight hours. The main threat from the storms will be strong wind gusts.

The front and boundaries generated by the showers and thunderstorms will push into South Central Texas by Monday and linger into Tuesday. Heating and forcing by the front/boundaries will generate isolated to widely scattered showers and thunderstorms on Monday into Tuesday. Another source of forcing may be an MCV that forms and drifts south into our area. The main threat from the storms will be strong wind gusts. The thermal ridge drifts to the west and along with very weak cold advection, allows for a slight "cool" down of high temperatures. However, models have trended warmer keeping high temperatures above normal for early in the week.

The northerly flow continues over our area advecting drier air aloft for Wednesday into Thursday while the front and boundaries dissipate. As a result, the models have trended drier with only the seabreeze generating any isolated showers and thunderstorms near the Coastal Plains. Similar to early in the week, forecast high temperatures have trended warmer, staying above normal. Strong mixing should allow for much lower afternoon heat index values.

PRELIMINARY POINT TEMPS/POPS. Austin Camp Mabry 79 104 78 105 77 / 0 - - 10 20 Austin Bergstrom Intl Airport 77 103 76 104 76 / 0 - - 10 20 New Braunfels Muni Airport 76 103 76 105 76 / 0 0 - 10 20 Burnet Muni Airport 76 105 76 102 75 / 0 - 10 20 30 Del Rio Intl Airport 77 107 78 106 79 / 0 - - 10 10 Georgetown Muni Airport 79 106 78 105 77 / 0 - - 10 30 Hondo Muni Airport 75 105 76 105 76 / 0 - - 10 10 San Marcos Muni Airport 77 103 76 104 76 / 0 0 - 10 20 La Grange - Fayette Regional 79 104 77 105 77 / 0 - - 10 20 San Antonio Intl Airport 78 104 78 105 77 / 0 0 - 10 10 Stinson Muni Airport 77 103 76 104 77 / 0 0 - 10 10

EWX WATCHES/WARNINGS/ADVISORIES. Heat Advisory until 7 PM CDT Saturday for Atascosa-Bastrop-Bexar- Caldwell-Comal-De Witt-Fayette-Gonzales-Guadalupe-Hays-Karnes- Lavaca-Lee-Travis-Williamson-Wilson.

Heat Advisory until 7 PM CDT Saturday for Bandera-Blanco-Burnet- Edwards-Frio-Gillespie-Kendall-Kerr-Llano-Medina-Real-Uvalde.



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


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Antonio, San Antonio International Airport, TX4 mi24 minSSE 610.00 miFair96°F61°F31%1012.6 hPa
San Antonio - Kelly Field, TX9 mi19 minSSE 810.00 miFair97°F61°F31%1012.9 hPa
Randolph Air Force Base, TX13 mi79 minSW 1110.00 miFair93°F62°F37%1013.9 hPa
San Antonio, Stinson Municipal Airport, TX13 mi22 minSSW 610.00 miFair95°F61°F32%1012 hPa
San Antonio Boerne Stage Field, TX17 mi20 minSSW 610.00 miFair90°F59°F36%1015.9 hPa
Castroville Municipal Airport, TX21 mi40 minS 510.00 miFair96°F60°F31%1015.2 hPa

Link to 5 minute data for KSAT

Wind History from SAT (wind in knots)
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Last 24hrS10SE9
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1 day agoS10
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2 days agoSE5
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Austin/San Antonio, TX (14,3,4,5)
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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.