Friday, August18, 2017 L-36.com


Marine Weather and Tides
Alvord, 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 6:52AMSunset 8:11PM Friday August 18, 2017 1:13 PM CDT (18:13 UTC) Moonrise 2:32AMMoonset 4:51PM Illumination 13% Phase: Waning Crescent; Moon at 26 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
    EDIT      (on/off)   Help
7 Day Forecast for Marine Location Near Alvord, TX
   Hourly   EDIT   Help
location: 33.36, -97.69     debug


Area Discussion for - Fort Worth, TX
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus64 kfwd 181739
afdfwd
area forecast discussion
national weather service fort worth tx
1239 pm cdt Fri aug 18 2017

Aviation
Main aviation concern is convective potential this afternoon.

An outflow boundary has ignited scattered thunderstorms just nw
of the dfw metroplex as of 17z. With ample moisture and
instability positioned along the i-20 corridor, expect new
development to continue in vicinity of dfw area TAF sites through
the early afternoon. Initiation will be aided by large-scale
ascent as well as lift from the approaching boundary. With
coverage and longevity of convection at the TAF sites still in
question, am still reluctant to tempo any TS for now, but will
handle with amds if it becomes necessary. There could also be a
brief wind shift to the NW associated with the boundary's passage,
but flow behind it isn't terribly strong. Otherwise, southerly
winds around 10 kts or less andVFR conditions will prevail
into Saturday. Waco is expected to remain rain-free through this
time frame.

-stalley

Short term issued 339 am cdt Fri aug 18 2017
today and tonight
late evening rainfall across part of the region yesterday has led
to a relatively cool start to the morning today. Temperatures are
generally in the low 70s across the region under mostly cloudy
skies. Main concern for today will again be the chance for
scattered showers and thunderstorms. We're watching a cluster of
thunderstorms across northwest oklahoma which will make some
southeast progress through the early morning hours. Most of this
convection will remain to our north, but it is likely that an
outflow boundary will make it into our area sometime later this
morning. Increasing convergence along the boundary as we heat up
later this morning into early afternoon should help generate at
least some scattered showers and thunderstorms. Goes-16
precipitable water images indicate a pocket of relatively drier
air currently over south-central tx. The model guidance seems to
have a good handle on this and spreads it north through midday
into the vicinity of waco. This results in a pool of higher
surface to 850mb moisture along the i-20 corridor north to the red
river. This will be the most likely location for scattered
showers and thunderstorms through this afternoon. Any afternoon
convection should diminish this evening.

Later tonight, we'll have to continue to watch to our north for
overnight convection. The model guidance has been rather
inconsistent with whether or not another round of convection will
develop across central southern oklahoma and possibly affect our
northern counties. With fairly weak flow aloft, organized
convection appears unlikely, although it will remain unstable and
uncapped well into the late evening. We'll keep some low pops
across the northern couple of rows of counties through the late
overnight hours.

Dunn

Long term issued 339 am cdt Fri aug 18 2017
Saturday through Thursday
as mentioned above, Saturday morning may start out with a decaying
complex of thunderstorms pressing south of the red river. While
most coarse-resolution model guidance indicates little in the way
of QPF across our northernmost counties during this time, several
past runs of the NAM and a handful of members from the ncar
ensemble indicate this as a potential. Given the level of moisture
and instability present to our north, any subtle influence from
forcing aloft would allow for at least some storm development,
sustained across the red river by 20-25 kt southwesterly 925 mb
winds. This rich inflow will be waning and veering during the
Saturday morning timeframe, so any lingering activity would likely
be quickly diminishing in coverage through the morning hours.

During the afternoon, high pressure will attempt to build back
west across the region. However, latest indications are that the
main area of subsidence will remain displaced mainly across
central texas and across the mid-texas coast. With 1500-2500 j kg
of mlcape, bolstered by afternoon heating and near 70-75 degree
dewpoints on the northern fringes of the better subsidence, it
appears at least isolated convection will be possible Saturday
afternoon mainly across the northeastern 2 3rds of the cwa. Since
any storms would be diurnally-driven, opted simply to introduce
very low (10-15%) chances given a lack of more appreciable
forcing. Deeply mixed inverted-v profiles with cloud bases near 8
kft mean any more robust pulse storms would be capable of
delivering a downburst wind threat.

Low storm chances will linger across our eastern counties on
Sunday and Monday afternoons, amidst the zone of best moisture
and associated instability.

By Tuesday and into the end of the week, it appears north and
central texas will come under a squeeze play from from an incoming
tutt out of the gulf of mexico, and the southwestern fringes of a
cold front sliding south out of kansas. The GFS continues to be
the laggard with this front, hanging it up across central oklahoma
where it washes out by week's end, while the ECMWF and canadian
both drive the front surprisingly far south--all the way to the
gulf coast. With the main upper forcing displaced well to the
north and east across the great lakes and ontario, it seems
unlikely this front would have enough forward momentum to blast
all the way through our region, at least without the help of a
well-developed MCS and associated cold pool. Either way, it
appears at least low thunderstorm chances are warranted across the
forecast area Tuesday through Friday, but no single day appears to
be a washout.

Regarding heat index values: while hot conditions are forecast
across the region (still near climatological norms), it appears
that sufficient mixing will take place into next week--especially
across our hottest areas in central texas--to limit both the areal
coverage and duration of 105+ heat index values. As a result,
while pockets of 105-108 degree values are forecast (mainly
Saturday), we do not think the coverage and duration is sufficient
to warrant a heat advisory at this time. We will, however,
continue to assess the latest model guidance and observational
trends on a shift-by-shift basis as we go through the next few
days.

Carlaw

Preliminary point temps pops
Dallas-ft. Worth 97 78 98 79 98 40 10 10 10 10
waco 98 77 100 77 99 10 10 10 10 10
paris 93 74 95 75 94 30 20 20 10 20
denton 96 76 97 77 97 50 20 20 10 10
mckinney 95 76 96 77 96 50 20 20 10 10
dallas 97 79 98 80 98 40 10 10 10 10
terrell 96 73 97 76 97 30 10 10 10 10
corsicana 97 77 98 77 97 20 10 10 10 10
temple 99 75 100 76 99 5 5 10 10 10
mineral wells 95 74 97 75 98 50 10 10 10 10

Fwd watches warnings advisories
None.

26 58


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Decatur, Decatur Municipal Airport, TX9 mi18 minW 63.00 miRain71°F69°F93%1018.6 hPa
Bridgeport, Bridgeport Municipal Airport, TX15 mi38 minN 010.00 miThunderstorm73°F72°F100%1019.6 hPa
Bowie Municipal Airport, TX17 mi38 minS 13 G 1910.00 miThunderstorm81°F71°F73%1018.3 hPa

Wind History from LUD (wind in knots)
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
Last 24hrCalmCalmCalmN5NE5SE10SW5SW6CalmCalmCalmCalmSE3E4CalmCalmCalmCalmCalmCalmNE3CalmSW6W5
1 day agoS11
G18
S9
G15
SE8SE9
G14
S10
G14
S10
G15
S10SE4S7S8S6S7S11S13
G17
S12N10E7E7SE5SE9SE7S7S8SW7
2 days agoS11S9S10SW8S7S12
G15
S7CalmE4E3SE4S6S10
G14
S13S12
G16
S9S9S9S11S11
G15
S13
G18
S11
G16
S10
G14
S11

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of SouthCentralPlains    EDIT
Geos

Wind Forecast for Fort Worth, TX (14,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Dallas/Fort Worth, TX
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.