Saturday, January23, 2021
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Marine Weather and Tides
Terrell Hills, TX

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:25AMSunset 6:05PM Saturday January 23, 2021 11:07 AM CST (17:07 UTC) Moonrise 1:51PMMoonset 3:01AM Illumination 78% Phase: Waxing Gibbous; Moon at 10 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 231420 AAA AFDEWX

Area Forecast Discussion . UPDATED National Weather Service Austin/San Antonio TX 820 AM CST Sat Jan 23 2021

UPDATE. We have updated the forecast to expand the mention of fog to cover all of south central Texas through late this morning. A few spots may briefly drop to near 1/4 mile at times. However, any occurence of this should be brief, so we will hold off on a Dense Fog Advisory for now.

PREV DISCUSSION. /ISSUED 545 AM CST Sat Jan 23 2021/

AVIATION . LIFR to low end MVFR conditions will become mostly LIFR as the day progresses as a warm frontal pattern develops. ISOLD SHRA east of I-35 late this afternoon become WDLY SCT-SCT tonight into Sunday. Have maintained the VCSH for now, as timing of the passage of the SHRA over the sites remains uncertain. Will update to include prevailing SHRA as model and radar trends become more certain. Northeasterly winds of 4 to 8 KTs will become easterly most areas, except southeasterly will prevail along the Rio Grande.

PREV DISCUSSION . /ISSUED 345 AM CST Sat Jan 23 2021/

SHORT TERM (Today through Sunday) . Cold front has moved across our area with weak isentropic lift developing a stratus layer within a few hours of its passage. The isentropic lift will keep our area socked in much this weekend. A few showers are possible near Del Rio this morning as lift briefly strengthens there. Then, isentropic lift increases this weekend along with a deepening of moisture plus the front moves back north as a warm front as an upper level trough moves from California to along the Arizona/New Mexico region on Sunday. This allows a few showers to develop east of I-35 this afternoon, then more widely scattered to scattered showers tonight into Sunday. A strong capping inversion, anti-cyclonic flow aloft, and extensive cloudiness will inhibit thunderstorms until late Sunday afternoon at the earliest due to warmer surface temperatures near peak heating and some thinning of the stratus. Rainfall amounts of 1/10 inch or less can be expected this weekend, although a few spots may have up to 1/4 inch. The overcast skies keep high temperatures cooler than the blended guidance, although within a degree or two of normal today. Temperatures remain near steady or slowly rise tonight as the warm front moves north leading to well above normal temperatures on Sunday.

LONG TERM (Sunday Night through Friday) . The cold front will approach and move through the area at or around 06Z Monday near DRT and through most of the CWA by 12Z Monday. Model soundings show the cap holding during Sunday night into Monday morning but cant rule out some isolated thunderstorms along with shallow rain showers mainly beneath the cap. There should be fairly rapid clearing behind the front so sunshine looks to be fairly abundant not only on Monday but days to follow through most of the work week. Could see some decent NW wind gusts in excess of 20 kt on Monday afternoon but these Pacific systems do not tend to be overall good wind makers. Max temps will stay in 70s for most areas Mon and Tue before another upper system moves through the Central and Southern Plains and pushes another surface high and front into the area early Wed. With our current drought status and pacific fronts this week . some elevated fire wx concerns will continue as RHs dip to near 20 percent out west mainly Monday and Wednesday afternoons. Models show a bit cooler mid week behind the Wed front with cooler max temps in the 60s Mainly Wed- Fri. Overnight lows during the week will be in the 30s/40s . getting a little warming by Fri. Models still disagree on the strength and track of another upper low around Saturday with the ECMWF still showing better dynamics and rain potential for us over next weekend. GFS remains drier and weaker with the system. Regardless we should see some returning clouds and higher dewpoints ahead of the system Fri-Sat.

PRELIMINARY POINT TEMPS/POPS. Austin Camp Mabry 62 60 74 56 71 / 10 30 40 60 - Austin Bergstrom Intl Airport 63 59 75 56 73 / 10 30 40 60 10 New Braunfels Muni Airport 64 60 78 59 75 / 10 30 30 50 - Burnet Muni Airport 59 57 72 52 70 / - 20 30 70 - Del Rio Intl Airport 65 60 77 52 71 / 10 20 20 30 0 Georgetown Muni Airport 60 58 72 55 70 / - 30 40 70 - Hondo Muni Airport 65 58 77 52 74 / 10 20 20 30 0 San Marcos Muni Airport 63 59 76 57 74 / 10 30 40 50 - La Grange - Fayette Regional 67 62 77 62 75 / 20 50 40 50 10 San Antonio Intl Airport 63 60 75 56 73 / 10 20 30 40 0 Stinson Muni Airport 65 60 77 57 73 / 10 20 30 30 0

EWX WATCHES/WARNINGS/ADVISORIES. None.

Short-Term/Aviation . Platt Long-Term . 05 Decision Support . Brady


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Antonio, San Antonio International Airport, TX6 mi17 minENE 610.00 miOvercast58°F52°F81%1016.5 hPa
San Antonio, Stinson Municipal Airport, TX9 mi15 minENE 610.00 miOvercast56°F53°F90%1016.8 hPa
Castroville Municipal Airport, TX22 mi33 minE 810.00 miOvercast61°F53°F75%1017.9 hPa
San Antonio Boerne Stage Field, TX22 mi33 minENE 510.00 miOvercast52°F52°F100%1018.6 hPa

Link to 5 minute data for KSAT

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Last 24hr34NW6SW33E6SE6SE4NE8E5NE7N9NE7NE5NE7NE6N5NE5NE5NE6NE4NE7E7NE6
1 day agoSW4S4SW345W4W4SW4SE3SE3CalmCalmS3W3CalmNW3W3CalmW4CalmNW4CalmCalmCalm
2 days agoN6N43CalmW3NW4CalmNW4NW3CalmCalmCalmCalmCalmCalmS3SW3SW5W4S5W4CalmSW6SW5

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
Ground Weather Radar Station




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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.