Wednesday, December11, 2019
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Marine Weather and Tides
Yankton, SD

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
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 7:48AMSunset 4:51PM Wednesday December 11, 2019 7:07 PM CST (01:07 UTC) Moonrise 4:48PMMoonset 7:06AM Illumination 100% Phase: Full Moon; Moon at 15 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 112344 AFDFSD

AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 544 PM CST Wed Dec 11 2019

SHORT TERM. (This Evening through Thursday) Issued at 310 PM CST Wed Dec 11 2019

Another night, another wave and another chance for some light snowfall. An upper level wave will move from the Northern Rockies into the Northern Plains tonight. Ahead of this wave broad warm advection will develop which will bring a less favorable thermal structure to the environment, mainly in terms of pushing the dendritic zone up to around 600 mb. This will make it a little tougher to produce snowfall as that layer only briefly saturates as well as levels lower struggling to saturate. The better chance should be late tonight as the main wave moves through and deeper saturation becomes possible. This better chance will likely be from about Huron to Brookings into southwest MN. Overall still only anticipate a half an inch or so of accumulation.

With the approaching wave surface winds will increase from the southeast and clouds will also increase. This should allow for most locations to see the lowest temperatures this evening then gradual rising through the night.

Thursday will see lighter winds and temperatures a little less cold as the wave moves east. There may be a little sun from time to time but generally mostly cloudy conditions are expected. High should reach the 20s in most locations with some lower 30s near Sioux City and Storm Lake.

LONG TERM. (Thursday Night through Wednesday) Issued at 310 PM CST Wed Dec 11 2019

Thursday night into Friday will see the next piece of energy move through and this one will have a little more punch behind it. Ahead of this wave late Thursday night into Friday morning some decent forcing spreads east. There will be similar thermal and saturation challenges with this lift, so only small pops for now. The lift is pretty good so if there ends up being a little more moisture than expected locations along and east of Interstate 29 could see a period of snow or possible mixed precipitation in the morning. Will need to keep an eye on trends during this time. As the main wave approaches in the afternoon winds will turn westerly which will allow for some warming, which will unfortunately be very short lived. Highs will make it into the upper 20s along highway 14 and near 40 around Sioux City.

Strong cold air advection develops on Friday afternoon and surges through into Saturday morning. This will bring some bitter cold air into the region. Have lowered highs a bit and increased winds which will support wind chill values around 15 below in many locations late Friday night into Saturday morning. Soundings do indicate the potential for stronger winds than forecast so that will be something to watch out for as well. While the snowfall potential with this surge is minimal we will likely see a quick tenth or two as temperatures into the dendritic zone in the lower levels and produce some arctic fluff. If this fluff can find a way to amount to an inch or so with the potential for 30 knot winds we could see some blowing snow late Friday night into Saturday morning.

Saturday and Sunday will be very cold with highs in the single digits and teens. There is some potential for Sunday morning to be very cold but right now as high pressure builds south high clouds appear to develop and move overhead which will limit the radiational cooling potential. Regardless should still see quite a few locations below zero and possibly close to 10 below near Marshall MN.

Confidence down a bit Monday through Wednesday as the models diverge a bit. Still some fast moving flow with differences in timing of cold air and warm air. Will not make many changes.

AVIATION. (For the 00Z TAFS through 00Z Thursday evening) Issued at 531 PM CST Wed Dec 11 2019

VFR conditions early in the TAF period with MVFR ceilings moving in by early Thursday morning. Light snow is possible after midnight, mainly along/north of Highway 14 into southwest Minnesota. Light snow could briefly drop conditions down to IFR. Kept snow mention out of KHON and KFSD TAFs, as soundings show lack of saturation around 5kft. LLWS possible at KFSD and KSUX from late evening into early Thursday morning.

FSD WATCHES/WARNINGS/ADVISORIES. SD . NONE. MN . NONE. IA . NONE. NE . NONE.

SHORT TERM . 08 LONG TERM . 08 AVIATION . SG


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yankton, Chan Gurney Municipal Airport, SD2 mi12 minE 910.00 miFair16°F10°F77%1025.5 hPa

Link to 5 minute data for KYKN

Wind History from YKN (wind in knots)
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Last 24hrSE5E6SE9E6NE4N9N5NW4N7N9N11N6NE8NE7E7E8E8E8E8E7SE10E10E10E9
1 day agoSW4SW5SW4CalmCalmNW11NW15
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2 days agoE8E9E75NW5NW12
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Tide / Current Tables for
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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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Sioux Falls, SD (20,4,5,8)
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Ground Weather Radar Station Sioux falls, SD
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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.