Monday, December9, 2019
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Marine Weather and Tides
Castle Hills, TX

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:15AMSunset 5:36PM Monday December 9, 2019 10:33 AM CST (16:33 UTC) Moonrise 4:04PMMoonset 4:41AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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 091212 AAA AFDEWX

Area Forecast Discussion . UPDATED National Weather Service Austin/San Antonio TX 612 AM CST Mon Dec 9 2019

UPDATE. A Dense Fog Advisory has been issued for portions of south central Texas until 10 AM CST. The Advisory area does cover Hondo, San Antonio, New Braunfels and San Marcos. We will continue to monitor the fog and will add additional counties if needed.

PREV DISCUSSION. /ISSUED 529 AM CST Mon Dec 9 2019/

AVIATION . LIFR ceilings have developed along with areas of dense fog for the I-35 sites. Low stratus and fog are expected to gradually erode by 15-18Z Mon, brief MVFR ceilings, then VFR conditions for the afternoon. Cold front will move over the area Monday night, reaching AUS/DRT around 03Z Tue and SAT/SSF 05Z Tue. VCSH for frontal passage and continues through the remainder of the period.

PREV DISCUSSION . /ISSUED 401 AM CST Mon Dec 9 2019/

SHORT TERM (Today through Tuesday) . Surface observations from early this morning show fog is developing generally along and east of the I-35 corridor. Some locally dense fog can not be ruled out this morning and we will continue to monitor trends. With winds being lighter along and south of the Highway 90 corridor, the lower visibilities should be favored from the San Antonio area east and south into the coastal plains. However, we are seeing plenty of mid and high level cloud cover move in from the west. This along with some stronger winds just above the surface will tend to disrupt widespread dense fog development. Once the fog burns off by late morning, we expect a warm day across south central Texas with highs in the mid 70s to lower 80s. Some records may be met or exceeded, with our current forecast showing records being tied at Austin Bergstrom and Austin Mabry, with Del Rio expected to break the current record high. Please see the below Climate section for more information.

We still expect a significant change in the weather tonight as a strong cold front moves through the region. With warm air advection above the shallow cold air mass, light rain is expected to develop this evening, then increase overnight as the cold air deepens. Rain chances on Tuesday remain high through the morning hours, but will decrease from west to east in the afternoon as the warm air advection pattern begins to shut off. Average rainfall amounts tonight through Tuesday are still expected to remain near or below 1/4".

LONG TERM (Tuesday Night through Sunday) . Cool and dry weather can be expected Tuesday night through Thursday with surface high pressure generally in control of our weather. Overnight lows are expected to drop to at or below freezing for the Hill Country and adjacent I-35 corridor north of San Antonio Tuesday night/Wednesday morning and again Wednesday night/Thursday morning. We will see another upper level system move in from the west late Thursday, but the models continue to remain in some disagreement on the path of this upper trough. As of now, it does not appear we will see any rain chances with this next upper system and will keep the forecast dry through the end of the work week.

Temperatures will warm Friday through Sunday with dry and stable westerly flow aloft over the region. Highs will return to the 60s and 70s with lows in the 40s and 50s.

CLIMATE . DECEMBER 9 Location Record High (Year) Austin Bergstrom 81 (2008) Austin Camp Mabry 81 (2008) San Antonio 85 (2008) Del Rio 80 (2004)

PRELIMINARY POINT TEMPS/POPS. Austin Camp Mabry 81 42 46 33 56 / 0 70 90 - - Austin Bergstrom Intl Airport 81 42 45 31 57 / 0 70 90 - - New Braunfels Muni Airport 79 43 47 32 57 / 0 70 90 - - Burnet Muni Airport 79 39 44 29 54 / 0 80 100 - - Del Rio Intl Airport 81 49 54 37 59 / 0 70 60 0 0 Georgetown Muni Airport 81 40 44 30 55 / 0 80 100 - - Hondo Muni Airport 81 46 53 32 60 / 0 70 70 - - San Marcos Muni Airport 80 43 47 31 57 / 0 70 90 - - La Grange - Fayette Regional 81 44 48 34 56 / 0 80 90 10 10 San Antonio Intl Airport 78 45 48 34 57 / 0 70 80 - 10 Stinson Muni Airport 80 47 50 35 58 / 0 70 80 - 10

EWX WATCHES/WARNINGS/ADVISORIES. Dense Fog Advisory until 10 AM CST this morning for Atascosa-Bexar- Caldwell-Comal-Frio-Guadalupe-Hays-Medina-Wilson.



Aviation . EWilliams Short-Term/Long-Term . Platt


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Antonio, San Antonio International Airport, TX4 mi42 minN 00.50 miFog65°F63°F93%1010.9 hPa
San Antonio - Kelly Field, TX9 mi97 minNW 33.00 miFog/Mist64°F64°F100%1011.2 hPa
Randolph Air Force Base, TX13 mi97 minN 01.00 miFog/Mist65°F65°F100%1011.9 hPa
San Antonio, Stinson Municipal Airport, TX13 mi40 minN 01.25 miFog/Mist64°F64°F100%1010.9 hPa
San Antonio Boerne Stage Field, TX17 mi58 minN 02.50 miOvercast61°F60°F100%0 hPa
Castroville Municipal Airport, TX21 mi58 minNE 31.75 miFog/Mist63°F63°F100%1012.5 hPa

Link to 5 minute data for KSAT

Wind History from SAT (wind in knots)
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Last 24hrS8SW6SW8S10S10S9S7S5S5CalmS7S8S6S7S4S3CalmCalmS3SW4CalmCalmNW3Calm
1 day agoNE5CalmCalmS54CalmSE6SE5CalmCalmCalmCalmNW3CalmCalmN4NW4CalmCalmCalmNW3NW4S6SW7
2 days agoN13
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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 (11,2,3,4)
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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 numerious 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.