Thursday, April15, 2021
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Marine Weather and Tides
Yankton, SD

Version 3.4
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1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:43AMSunset 8:10PM Wednesday April 14, 2021 11:32 PM CDT (04:32 UTC) Moonrise 7:13AMMoonset 9:55PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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 150336 AAA AFDFSD

AREA FORECAST DISCUSSION . UPDATED National Weather Service Sioux Falls SD 1036 PM CDT Wed Apr 14 2021

SHORT TERM. (This Evening through Thursday) Issued at 302 PM CDT Wed Apr 14 2021

Mostly cloudy and cool conditions will continue to dominate the region through Thursday, with the main change from recent days being even lighter winds as a low level ridge axis moves east across the Dakotas.

Clouds across the southwest half of the forecast area may decrease for a time this evening, but with north-northeast low level flow ahead of the ridge axis, seems reasonable that the lower clouds over our northeast would expand back to the south and west later tonight into Thursday. In addition, will see higher clouds advancing into the western areas later Thursday ahead of trough axis pushing east out of the Rockies. So all in all, expecting a fair amount of cloud cover Thursday.

As far as temperatures, with potential clearing this evening, along with decreasing winds and dry air mass, southwest areas could see temperatures fall off quickly this evening, before leveling over as clouds build back in later tonight. However, even areas with more extensive cloud cover are expected to drop back below freezing again tonight, with lows largely mid 20s-around 30. The persistent cloud cover along with the lingering cool air mass will hold temperatures in the 40s most areas Thursday, perhaps a few lower 50s in our far south.

LONG TERM. (Thursday Night through Wednesday) Issued at 302 PM CDT Wed Apr 14 2021

The upper trough moving out of the Rockies will largely impact areas to our south Thursday night into Friday night, with perhaps some light precip brushing along the Missouri River Valley. Otherwise seasonably cool temperatures will continue into the first half of the weekend, with little change in low level thermal fields apparent through Saturday. Look for low temps a few degrees either side of freezing, largely dependent on cloud cover and winds, which will remain on the lighter side, but likely not completely calm. Highs should notch up a category or two, but still seeing mid 40s-lower 50s prevailing Friday/Saturday. Could possibly see a few light showers Friday night/Saturday as northern stream wave drops south across the area, but not seeing great consensus on moisture profiles nor the strength of the wave, so will stick with a dry forecast for now.

Brief "warm-up" Sunday with subtle short-wave ridging aloft and thermal ridge building into the northern Plains. Unfortunately, this is building ahead of another sharp cold front, which will push south across the region Sunday night/Monday. Still some timing variation among the models on exactly how quickly this will push south, but seemed prudent to lower NBM highs a few degrees for Monday, as they were 3-5F warmer than the blended 50th percentile, and it appeared that more ensemble members were leaning a little faster/cooler with the boundary timing. NBM has introduced some low pops with this system, and given potential cooling, certainly possible that we could see some accumulating snow with this system. Given the aforementioned timing/strength differences among the various models, far too early to try to determine where or how much, though the ensemble probabilities point to amounts on the lighter side, which makes sense given the projected quick movement of any post-frontal snow band.

Some warming again possible as we move into the middle of next week, but not quite enough yet to bring readings back up to normal for late April.

AVIATION. (For the 06Z TAFS through 06Z Thursday night) Issued at 1032 PM CDT Wed Apr 14 2021

MVFR stratus will prevail tonight, gradually spreading south down to SUX early this morning. Though a break in the stratus has developed at HON and may spread down to FSD for a brief period, expect lower 1-2 kft stratus to fill back in. Northerly winds continue to slowly weaken to near to below 10 kts. Along and northeast of a line from SPW to FSD to HON, ceilings will likely drop to 1-2kft soon. Lingering uncertainty regarding when exactly MVFR ceilings will arrive at SUX and how long stratus will linger into Thursday across northwest IA. Kept TAFs on the optimistic side at or above 2kft for now, but it is certainly possible to have 1000-2500ft ceilings linger all day across the region, especially at FSD and HON.

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

SHORT TERM . JH LONG TERM . JH AVIATION . BP


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yankton, Chan Gurney Municipal Airport, SD2 mi36 minWNW 510.00 miFair35°F28°F76%1027.6 hPa

Link to 5 minute data for KYKN

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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