Friday, September20, 2019 L-36.com


Marine Weather and Tides
Terrell Hills, TX

Version 3.4
NOTICE
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 7:20AMSunset 7:34PM Friday September 20, 2019 7:41 PM CDT (00:41 UTC) Moonrise 10:51PMMoonset 12:01PM Illumination 57% Phase: Waning Gibbous; 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 210002
afdewx
area forecast discussion
national weather service austin san antonio tx
702 pm cdt Fri sep 20 2019

Aviation 00z tafs
Vfr conditions will prevail through this evening with MVFR ceilings
developing around 05z for the san antonio terminals as a 25-35 knot
low level jet overrides the balcones escarpment. As was the case
last night, ssf appears to be on the southern edge of this deck and
current TAF may need to be amended to shorten the duration of MVFR
conditions as stratus straddles the san antonio metro. Lowered
ceilings are expected to spread into aus and drt closer to 10-12z
with all terminals returning toVFR 15-17z.

A few pre-dawn streamer showers associated with the low level jet may
reach the corridor between aus and Sat but have left the tafs dry for
now due to low confidence. However, did add a vcsh mention in for
the austin and san antonio terminals late Saturday morning as a few
showers are expected to develop once convective temperatures are
reached. Otherwise, gusty southeast winds in the 10-20 knot range
this evening should subside 02-04z as the surface pressure gradient
relaxes.

Prev discussion issued 308 pm cdt Fri sep 20 2019
short term (tonight through Saturday night)...

isolated to scattered showers and thunderstorms continue this
afternoon for areas near the coastal plains. Deeper moisture along
with the sea breeze will favor rain chances for areas generally along
and east of the i-35 i-37 corridors through early evening. However,
we could see some isolated activity near i-35 and will keep a low
chance in the forecast through early evening. With the loss of
daytime heating, most activity is expected to decrease. For the
overnight hours, the strengthening low-level jet will promote the
development of a few streamer showers over the hill country, i-35
corridor and coastal plains. Overnight lows will remain well above
normal, given southerly flow in the low-levels. Most areas will
remain in the in the 70s, with a few readings in the upper 60s over
the hill country.

Little change in the overall pattern is anticipated on Saturday. We
could see some isolated to scattered showers and storms, mainly
during the afternoon hours for areas generally along and east of
highway 281. It will be warm again on Saturday, with highs generally
in the 90s. With humid conditions in place, afternoon heat index
values will rise to around 105 degrees along and east of i-35.

Long term (Sunday through Friday)...

above normal temperatures will continue for Sunday into early next
week as a subtropical ridge axis anchored over the southeastern u.S.

Will extend westward into the eastern and southern portions of texas.

An upper level trough axis will pass to our north on Sunday, but will
likely not have an impact on our weather given the strength of the
upper level ridge. Temperatures through the middle of next week will
remain above normal with highs generally in the 90s and lows in the
upper 60s and 70s. We prefer to go with the warmer ECMWF guidance
numbers with respect to maximum and minimum temperatures. The upper
level ridge axis may weaken or re-center itself over the eastern gulf
of mexico as we head into the middle of the upcoming weak. This may
allow for deeper southerly flow in the mid-levels, which may bring a
slight uptick in precipitation chances. However, we prefer to keep
rain chances low at this time in case the subtropical ridge axis
remains stronger than anticipated.

For mid to late week, the medium range models continue to show an
upper low somewhere over the desert southwest or northern mexico. The
models do eventually lift this system into the southern u.S. Plains,
but at this time it is advertised to remain too far north to offer
a great opportunity for rainfall. However, given a slightly more
active flow aloft, we will keep low rain chances in the forecast for
most areas for the mid to late week period. As for temperatures, we
do not see much relief given a warm a humid air mass maintaining it's
grip across the region.

Preliminary point temps pops
Austin camp mabry 76 98 74 95 74 20 20 - 10 -
austin bergstrom intl airport 76 96 73 94 72 20 20 - 20 -
new braunfels muni airport 75 95 73 95 72 20 20 10 20 -
burnet muni airport 75 92 72 93 71 10 20 - - -
del rio intl airport 77 98 76 97 76 10 0 0 0 -
georgetown muni airport 75 94 73 94 71 10 20 - 10 -
hondo muni airport 76 98 74 98 72 10 20 10 10 -
san marcos muni airport 76 95 72 94 71 20 20 - 20 -
la grange - fayette regional 75 95 74 94 73 10 30 - 30 -
san antonio intl airport 78 95 75 95 74 20 20 10 10 -
stinson muni airport 78 97 75 96 75 20 20 10 10 -

Ewx watches warnings advisories
None.

Aviation... Huffman
short-term long-term... Treadway


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Antonio, San Antonio International Airport, TX6 mi50 minESE 20 G 2610.00 miPartly Cloudy and Breezy89°F70°F53%1010.6 hPa
San Antonio - Kelly Field, TX8 mi1.8 hrsSE 1810.00 miA Few Clouds and Breezy92°F69°F47%1010.3 hPa
San Antonio, Stinson Municipal Airport, TX9 mi48 minSE 14 G 2010.00 miA Few Clouds93°F69°F46%1010 hPa
Randolph Air Force Base, TX11 mi45 minSE 1610.00 miPartly Cloudy89°F71°F57%1011.9 hPa
Castroville Municipal Airport, TX22 mi66 minSSE 17 G 2510.00 miFair92°F66°F42%1012.2 hPa
San Antonio Boerne Stage Field, TX22 mi66 minSSE 9 G 1910.00 miMostly Cloudy86°F69°F59%1013.9 hPa

Link to 5 minute data for KSAT

Wind History from SAT (wind in knots)
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Last 24hrE13SE14E16
G25
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G20
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1 day agoNE4E10E11E9SE9E5SE7SE5SE5S5S5S5S6S8S8S7SW6S64SE11SE10
G14
SE11SE8SE9
2 days agoE8E4E5E4E4CalmSE5S4CalmNW4NW6NW4NW4CalmCalm3W4SW6SW5CalmW104NW4N4

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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Wind Forecast for Austin/San Antonio, TX (20,4,5,8)
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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 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.