Friday, July21, 2017 L-36.com


Marine Weather and Tides
Preston, TX

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:29AMSunset 8:35PM Friday July 21, 2017 5:48 PM CDT (22:48 UTC) Moonrise 3:40AMMoonset 6:02PM Illumination 3% Phase: Waning Crescent; Moon at 28 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 Preston, TX
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location: 33.84, -96.62     debug


Area Discussion for - Fort Worth, TX
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area forecast discussion
national weather service fort worth tx
319 pm cdt Fri jul 21 2017

Short term
A strong mid-upper ridge remains anchored over the central conus
as seen on the latest satellite imagery and upper air analyses.

Subsidence from the ridge combined with the dewpoints in the 70s
means that uncomfortably hot weather will continue into the
weekend. Overnight lows tonight will likely remain near 80
degrees in the highly urbanized areas of the dfw metroplex, with
mid and upper 70s elsewhere. The heat advisory will continue
through Saturday, with little in the way of rain chances until
perhaps late in the weekend (see long term section).

30

Long term
Saturday through Friday
Saturday will once again feature toasty conditions, with high
temperatures soaring into the upper 90s to near 100 degrees.

Dewpoints, which will start the day off in the mid 70s, will
gradually mix into the upper 60s and lower 70s along and east of
the i-35 corridor, right in step with trends over the past few
days. This combination will result in heat index values in the
105-108 degree range. As a result, a heat advisory will continue
through Saturday evening for locations roughly along and east of a
bowie to killeen line.

A very subtle ripple weakness in the mid-level flow is currently
evident traipsing across the texas big country. This feature will
continue to meander just to our west on Saturday, and some high-
resolution guidance seems to be hinting at the possibility of a
few showers popping up pretty much area-wide with the heating of
the day. Lingering large-scale subsidence afforded by the
retreating mid-level high to our north may be enough to keep any
activity very limited, and we'll cover this outside potential with
silent 10% pops for the time being. A better spatio-temporal
overlap of moisture and a bit of lift will exist across our far
southeastern counties during the afternoon as an upper-low
currently pinwheeling westward across the gulf of mexico impinges
upon the region. Activity looks to remain limited enough to cap
pops at 20% south and east of a temple to athens line. A strong
wind gust or two can't be ruled out with surface air temperatures
in the upper 90s.

On Sunday, north and central texas will become sandwiched between
the aformentioned upper-low to our south, and a weak stalling cold
front to our north in oklahoma. Interestingly, the 3-km NAM fires
off isolated convection across our western counties during the
morning hours. Normally, this would appear a bit overdone, but
given supporting evidence of some weak isentropic upglide across
this region co-located with some mid-level instability, went ahead
and added in a low (10%) chance of an isolated storm or two during
the morning hours. With a moist and unstable atmosphere developing
as heating takes place, isolated to scattered convection will be
possible across the entire region during the afternoon.

Regarding heat index values: it appears additional low-level
moisture will slosh into the region. That said, a good deal of
uncertainty exists regarding how early convection fires, which
will obviously impact high temperatures. As a result, we elected
to hold off on issuing a heat advisory for Sunday for the time
being. If it appears clouds and storms will remain at bay later
into the afternoon, then either an extension of the current heat
advisory, or a smaller advisory may be warranted. Whether an
advisory is issued or not, it will continue to be hot, and proper
precautions against heat-related illness should be exercised.

Low storm chances will linger on Monday mainly north of i-20 as
storms firing in oklahoma may drift into north texas. Thereafter,
high pressure will once again begin to build back overhead during
the middle and end of the week. Heat indices are expected to once
again rise into the 105-110 degree range on Thursday and Friday,
which may necessitate additional heat headlines into the upcoming
weekend. Unfortunately, the dog days of summer are here to stay.

Carlaw

Aviation issued 1154 am cdt Fri jul 21 2017
the latest water vapor loop clearly indicates a dominant ridge
over the central part of the conus, which will keep quiet weather
in place for the next 36 to 48 hours. The forecasts will consist
ofVFR conditions and generally south winds around 10 kt. The
ridge will briefly break down on Sunday as an upper level
disturbance drops southeast through the central plains. This
feature may kick off a round of thunderstorms, which may affect
north texas on Sunday afternoon. Though this would be beyond this
set of tafs, it will be something to keep an eye on as we head
into the weekend.

30

Preliminary point temps pops
Dallas-ft. Worth 81 99 80 98 80 5 10 5 20 20
waco 77 100 78 98 77 5 10 10 20 20
paris 76 96 75 94 74 5 5 5 30 20
denton 78 99 78 98 76 5 10 5 20 20
mckinney 77 97 77 95 76 5 10 5 30 20
dallas 82 100 81 97 80 5 10 5 20 20
terrell 77 96 76 97 76 5 10 5 30 20
corsicana 77 98 77 96 76 5 10 5 30 20
temple 76 99 76 97 75 5 10 10 20 10
mineral wells 76 99 76 98 74 5 10 5 20 20

Fwd watches warnings advisories
Heat advisory until 8 pm cdt Saturday for txz091>095-102>107-
117>123-131>135-144>148-157>162-174-175.

90 30


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sherman/Denison, Grayson County Airport, TX8 mi54 minS 910.00 miMostly Cloudy94°F69°F44%1013.9 hPa
Durant, Eaker Field Airport, OK14 mi54 minS 810.00 miPartly Cloudy99°F68°F37%1013.9 hPa

Wind History from GYI (wind in knots)
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Last 24hrSE10SE7SE8SE7SE8SE8S7SE8S8S7S5SE5SE6S6S7S10S10SW11
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1 day agoS7S9SE7SE7SE8SE8SE9SE8SE8S7S6S6S7S5S9SW10SW9SW10SW8S5S9CalmS6SE9
2 days agoSE8SE6E4SE5SE7SE7SE6SE5SE6SE7S4S5S4S7S5S9SW9SW3CalmSW4SE10SE6S9SE9

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Fort Worth, TX (18,4,5,8)
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Ground Weather Radar Station Dallas/Fort Worth, 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.