Thursday, August24, 2017 L-36.com


Marine Weather and Tides
Yankton, SD

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 6:40AMSunset 8:17PM Wednesday August 23, 2017 11:51 PM CDT (04:51 UTC) Moonrise 7:45AMMoonset 8:36PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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 Yankton, SD
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location: 42.89, -97.39     debug


Area Discussion for - Sioux Falls, SD
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Fxus63 kfsd 240325
afdfsd
area forecast discussion
national weather service sioux falls sd
1025 pm cdt Wed aug 23 2017

Short term (this evening through Thursday)
issued at 351 pm cdt Wed aug 23 2017
a few showers associated with a subtle bit of forcing and some mid
level moisture are possible tonight across southwest minnesota and
northwest iowa. Instability is quite limited, so will leave mentions
of thunder out of the forecast. After overperforming in many spots
last night despite the calm conditions, tonight's lows look to be
warmer due to an expected 5 to 10 knot southeast breeze.

Biggest forecast problem tomorrow will be the chance for showers and
storms Thursday afternoon. Forecast area will be under the favorable
region for ascent in relation to an upper level jet centered roughly
along an axis from the twin cities to indianapolis. At the same
time, a weak impulse will swing across northern nebraska, bringing
some additional forcing to areas along the missouri river. Have
accordingly kept some chance pops in that area before 00z Friday.

Long term (Thursday night through Wednesday)
issued at 351 pm cdt Wed aug 23 2017
strong moisture advection in the 700-800 mb layer may lead to
scattered showers and thunderstorms Thursday evening mainly south of
i-90. This activity is expected to expand across the eastern half of
the forecast area through the overnight hours Thursday night into
Friday morning.

Friday is conditionally unstable as temperatures warm above 70
degrees, especially west of i-29 where the cap is weaker. Have
lowered forecast highs on Friday with abundant cloud cover expected
ahead of a series of short waves through the weekend. The first
wave is expected to pass to the south of the region, but still
result in elevated showers and thunderstorms across the region.

Effective shear is weak, so am not anticipating severe weather, but
storms could temporarily pulse up with 1000-2000 j kg of elevated
cape. Then on Saturday a second wave tracks from west to east across
south dakota. Expect showers and embedded thunderstorms throughout
much of the day on Saturday, gradually decreasing Saturday evening
between disturbances. On Sunday, another wave is expected to pivot
through the eastern portions of the forecast area. Elevated
inversion will likely keep much of southeastern south dakota dry,
while there is a chance for showers and thunderstorms across
portions of southwest minnesota into northwest iowa.

Ecmwf hints that system will struggle to work far enough to the east
on Monday while the GFS is much more progressive. Have left mention
of storms in forecast across northwest iowa Monday afternoon for
potential of slowly evolving pattern.

Thereafter, conditions look to quiet down as surface ridge builds
into the upper midwest. Temperatures through the period remain cool,
generally 5-10 degrees below normal.

Aviation (for the 06z tafs through 06z Thursday night)
issued at 1020 pm cdt Wed aug 23 2017
most high resolution models continue to hint that showers and
isolated thunderstorms may begin to redevelop after midnight as a
wave approaches from the north. Soundings though show a fairly
narrow corridor of moisture with slight instability aloft above
it. Will play a bit of scattered storm coverage for the terminals,
but due will only include a vcsh as there is too much uncertainty
on where showers will actually travel. Any impact will be minimal
to the terminals however, with no restrictions expected.

Mid-level clouds will linger into the mid-morning hours, with a
chance of diurnal CU reforming in the afternoon. Winds will remain
light and southerly to southeasterly through Thursday.

Fsd watches warnings advisories
Sd... None.

Mn... None.

Ia... None.

Ne... None.

Short term... Ferguson
long term... Bt
aviation... Dux


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yankton, Chan Gurney Municipal Airport, SD2 mi55 minSE 810.00 miMostly Cloudy68°F61°F78%1015.6 hPa

Wind History from YKN (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmE3CalmCalm55S9S9S11S12S16SE14S11S11SE8SE8SE7SE8
1 day agoW6W10NW11NW9NW10NW8NW8NW8NW8NW9NW10W7W8NW8
G16
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6W10NW7--W6CalmCalmE3Calm
2 days agoNE9NE5NE7NE7E6SE12E10E6SE8SE9SE11
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SE7SE11SE6NW10
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G17
N3NE6E3--S4SW6

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
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Sioux Falls, SD (0,6,7,8)
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Ground Weather Radar Station Sioux falls, SD
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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.