Wednesday, November14, 2018 L-36.com


Marine Weather and Tides
Yankton, SD

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:19AMSunset 5:03PM Wednesday November 14, 2018 2:33 AM CST (08:33 UTC) Moonrise 1:11PMMoonset 11:12PM Illumination 37% Phase: Waxing Crescent; Moon at 6 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 140430
afdfsd
area forecast discussion
national weather service sioux falls sd
1030 pm cst Tue nov 13 2018

Short term (this evening through Wednesday)
issued at 400 pm cst Tue nov 13 2018
not much going on tonight and Wednesday. Basically a surface trough
of low pressure will set up shop over central and western sd,
ushering in a southerly or southwest flow of air. This makes lows
rather tricky tonight due to light flow. Temperatures could plummet
pretty good over the usual low lying areas, and across the remaining
snow cover near the mo river valley between chamberlain sd and sioux
city. For the snow covered locations and low areas, trended lows
below guidance, well down into the teens. 925mb temperatures warm
enough on Wednesday to suggest highs an average of 5 to 10 degrees
warmer than they were this afternoon. Similar to today, manually
lowered highs a bit over the last bit of snow cover remaining in far
southeast sd. Otherwise we are looking at widespread mid 40s to
lower 50s for Wednesday highs.

Long term (Wednesday night through Tuesday)
issued at 400 pm cst Tue nov 13 2018
on Wednesday night, the gradient tightens in a southwest to
northeast orientated fashion across our eastern zones in response to
strengthening low pressure moving eastward across south central
canada. This type of gradient coupled with strong 925mb winds looks
like a classic for windy overnight conditions in southwest mn.

Manually raised wind speeds over the buffalo ridge terrain into the
20 to 30 mph category before decreasing in the pre dawn hours on
Thursday. Then on Thursday, the aforementioned surface low in
central canada finally moves east enough to nudge the surface trough
through our area, which will shift the winds to a west to northwest
direction through the day. Behind the trough, wind speeds will
become rather breezy across our northern and western zones with 20
to 30 mph common in the afternoon. This will put a bit of an edge on
an otherwise pleasant temperature day which will be in the mid 40s
to lower 50s across this forecast area. Winds will be lighter
elsewhere.

The next feature to keep an eye on is our well advertised light
precip event moving from north to south later Friday, Friday night
and early Saturday. A short wave showing up in the various
deterministic models is swinging southeastward along the backside of
strong upper low pressure centered over the hudson bay. A jet streak
is moving southward with this energy of over 100 knots which makes
the short wave more discernible. Strong baroclinicity exists in both
the lower and mid levels as the frontal boundary moves through,
bringing a 6 to 8 hour window of deep layer saturation in the lowest
6 km. Most of the accumulating precip will thus occur from Friday
afternoon through Friday night, again, sagging from north to south.

Both the ECMWF and GFS soundings show a thermal profile which now
suggests either rain or snow, or rain changing to snow. Precip
amounts still look rather light without a prolonged push of deep
layer saturation, therefore it appears that snow amounts will be two
inches and less in our forecast area.

It will be pretty breezy behind the frontal passage Friday night and
early Saturday, leading into a much cooler high on Saturday with
readings only in the lower to mid 30s. From Sunday onward, there is
the usual model discrepancy between the various deterministic
outputs so just ran with the superblend, which shows a slow warming
trend of temperatures closer to normal by next Tuesday.

Aviation (for the 06z tafs through 06z Wednesday night)
issued at 1028 pm cst Tue nov 13 2018
vfr conditions are expected through the TAF period.

Fsd watches warnings advisories
Sd... None.

Mn... None.

Ia... None.

Ne... None.

Short term... Mj
long term... Mj
aviation... Jm


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yankton, Chan Gurney Municipal Airport, SD2 mi38 minN 010.00 miFair25°F21°F88%1030.5 hPa

Wind History from YKN (wind in knots)
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Last 24hrCalmCalmSE4SE3CalmE3CalmCalmCalmCalmSW6S5SW3S8S3S3CalmCalmS4S3CalmCalmCalmCalm
1 day agoN10NW10NW11NW18
G22
NW14NW12N14NW12NW12NW12NW15NW16NW15
G19
NW9NW9W7W8W7NW4CalmCalmSW3CalmCalm
2 days agoW11W6W9W11NW17NW14NW17
G25
NW18NW18NW18
G21
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G26
NW15NW15NW15NW12NW8NW7NW5NW5W4W5W5NW6N8

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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wmap_A
GOES 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.
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Wind Forecast for Sioux Falls, SD (3,6,7,8)
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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.