Saturday, November28, 2020
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Marine Weather and Tides
St. Hedwig, 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 7:07AMSunset 5:35PM Saturday November 28, 2020 2:47 AM CST (08:47 UTC) Moonrise 4:42PMMoonset 5:29AM Illumination 96% 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 St. Hedwig, TX
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location: 29.43, -98.23     debug


Area Discussion for - Austin/San Antonio, TX
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FXUS64 KEWX 280442 AFDEWX

Area Forecast Discussion National Weather Service Austin/San Antonio TX 1042 PM CST Fri Nov 27 2020

AVIATION. MVFR stratus is in place at the I35 sites and should move in at DRT later tonight. Ceilings are expected to lower further into IFR categories as well before sunrise. Some light rain can be seen on radar south of SAT and west of AUS. Will begin SSF with VCSH but hold off for the rest of the sites until 8-10z when more widespread rain will move into the area. Periods of rain will then last through much of the day and into the early evening hours. Ceilings may lower to near 400 feet and visibility to 1 mile during the heavier periods. Rainfall will end from west to east in the evening hours with ceilings slowly improving as well tomorrow night.

PREV DISCUSSION. /ISSUED 803 PM CST Fri Nov 27 2020/

UPDATE . Updated the evening and overnight forecast to account for current trends. Lowered PoPs in the evening hours outside of the Coastal Plains as a decent break in activity should continue. Closer to morning, expect coverage of activity to increase across the western and southern areas of the CWA before spreading across the area. Latest forecast shows these trends.

PREV DISCUSSION . /ISSUED 359 PM CST Fri Nov 27 2020/

SHORT TERM (Tonight through Saturday Night) .

A cold front is moving through South Central Texas this afternoon. It stretched from Giddings to San Antonio to Dryden. Showers and isolated thunderstorms have developed ahead of the front. A mid to upper level low is over the AZ/NM border. The front should be down to our border by the start of this period. Most of the precipitation associated with the front will be out of our CWA. The next round of precipitation will come with the upper low. This feature will move into West Texas tonight and across the Panhandle Saturday. This will produce showers and thunderstorms tonight and Saturday. PW values will increase to 1.5 to 2.0 inches across most of the region. This moist airmass will feed convection and locally heavy rain will be possible. The deepest moisture will be over our southeastern counties and this will be where we expect the highest rainfall totals. Rainfall totals from tonight through Saturday night will range from 0.5 in. over the Rio Grande Plains to near 3 in. over the Coastal Plains. There will be some locally higher amounts. Although the antecedent conditions are very dry, this amount of rain in this short time may produce some minor flooding especially in the San Antonio and Austin metro areas. Saturday night the upper low will move into central OK and the rain over our CWA will end from west to east. Most showers Saturday night will be over the eastern half of the CWA.

Cooler air behind the cold front will bring low temperatures about 10 degrees cooler Saturday morning and another 10 degrees cooler Sunday morning. The combination of cold air advection with cloudy skies and rain will keep highs Saturday about 15 degrees cooler than today.

LONG TERM (Sunday through Friday) .

Upper level low pressure system over North Texas and Oklahoma and the strengthening surface low just off the Louisiana Gulf coast advances eastward Sunday and into early next week. Drier air will continue to infiltrate south-central Texas in the wake of this system, which will be reinforced by the push of a secondary cold front across the region late Sunday as a tailing shortwave pivots across the south-central plains behind the main upper low.

Strong surface high pressure will position over the region behind this secondary cold front, yielding to continued below average temperatures into next week. Moderate north winds behind the cold front overnight Sunday night into Monday will limit radiational cooling but a few locations across the Hill Country could fall to below freezing. The coldest temperatures this week are expected overnight Monday into Tuesday morning where light winds and clear skies will promote strong radiational cooling with temperatures expected to fall below freezing for the majority of the CWA. Lows look to drop into the mid 20s for some locales. Temperatures do modify slightly for Tuesday afternoon but it will remain cool and below normal.

The global model guidance then differ for the mid to late week in regards to the upper level pattern and the next potential for rainfall. The GFS/CMC model guidance indicate a more progressive solution with a trough digging from out of the Pacific Northwest before evolving into an upper low, as additional shortwave energy coming out of Canada feeds into the system, across the central Plains. Whereas the ECMWF is slower with the initial trough and results in a cutoff low across the Desert Southwest. The upper low then digs southeastward into Mexico and west Texas as the secondary shortwave energy moves out of Canada. The ECMWF solution would favor surface low formation further to the south and west of the GFS/CMC solution along with the favoring of better rain chances across Texas, in association with the next front. The GFS/CMC solutions also advance a cold front across the region by late week but trend drier given the position of the parent surface low further to the north. Overall, below average temperatures remain with cold starts each morning followed by cool afternoon conditions. The rainfall forecast will include a chance for showers, perhaps a small chance of a thunderstorm, for now as indicated by the model blend.

PRELIMINARY POINT TEMPS/POPS. Austin Camp Mabry 54 60 43 61 39 / 60 90 50 - 0 Austin Bergstrom Intl Airport 54 61 43 62 37 / 60 90 50 - 0 New Braunfels Muni Airport 56 64 45 66 40 / 70 90 50 0 0 Burnet Muni Airport 51 55 40 60 35 / 50 90 40 0 0 Del Rio Intl Airport 55 60 41 72 41 / 60 70 - 0 0 Georgetown Muni Airport 53 59 41 60 36 / 50 90 50 - 0 Hondo Muni Airport 54 61 41 69 38 / 70 90 20 0 0 San Marcos Muni Airport 54 61 43 63 38 / 60 90 50 - 0 La Grange - Fayette Regional 59 65 46 62 39 / 80 90 70 - 0 San Antonio Intl Airport 56 61 44 65 41 / 80 90 40 0 0 Stinson Muni Airport 56 61 44 66 41 / 80 90 40 0 0

EWX WATCHES/WARNINGS/ADVISORIES. None.

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


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Randolph Air Force Base, TX8 mi51 minNNE 910.00 miOvercast58°F50°F76%1017.2 hPa
San Antonio, Stinson Municipal Airport, TX14 mi54 minNE 10 G 1810.00 miOvercast58°F53°F84%1015.9 hPa
San Antonio, San Antonio International Airport, TX15 mi56 minNNE 9 G 1610.00 miOvercast59°F50°F72%1016.3 hPa
San Antonio - Kelly Field, TX19 mi51 minNE 810.00 miLight Rain59°F52°F77%1015.8 hPa
New Braunfels Regional Airport, TX22 mi56 minNNE 14 G 2110.00 miOvercast61°F48°F65%1016.8 hPa

Link to 5 minute data for KRND

Wind History from RND (wind in knots)
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Last 24hrNE3NW4--N3S11SE4SW3N4NW4NW10CalmN3N7NE8N13
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1 day agoN4NW6NW5NW6NW4CalmN4NE3NE3NE4Calm--S5CalmCalmCalmCalmN4N4NW5N5NE3CalmNW3
2 days agoCalmN3N7N13N10N12N9N11N12NE9NE8NE6NW4E7E7E5NE4NE3NE3NE3NE3CalmN3N3

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 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.