Friday, March5, 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 6:54AMSunset 6:22PM Friday March 5, 2021 7:49 PM CST (01:49 UTC) Moonrise 1:10AMMoonset 10:44AM Illumination 51% Phase: Third Quarter Moon; Moon at 22 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 052332 AFDFSD

AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 532 PM CST Fri Mar 5 2021

SHORT TERM. (This Evening through Saturday) Issued at 259 PM CST Fri Mar 5 2021

Lingering stratus in far northwest corner of the forecast area showing impact it can have on temperatures, with stations below the stratus still in the upper 30s as of 20Z, while KHON just popped up to around 50 after its light wind swung to a different direction and stopped pulling from the stratus area just to its west.

This could come into play again Saturday, as we are anticipating some redevelopment of fog/low stratus in some areas again tonight. However, latest model runs have been trending toward lesser coverage of fog, mainly focused in our trouble area this morning just west of the James River Valley, so impact may not be too significant over the rest of the forecast area. That said, still expecting increasing southeast flow through the morning Saturday, which could aid in more quickly dissipating any fog/stratus.

As far as temperatures, should see our warm afternoon readings drop off rather quickly this evening with the light winds/clear skies, but could level off slightly after midnight as low level winds begin to increase a bit in the wake of departing surface ridge. Generally looking for lows in the upper 20s-lower 30s. For highs on Saturday, southeast low level flow is not typically the most favorable for strong mixing, and models are depicting a rather tight low level thermal gradient across the region. Greatest uncertainty is found along/east of I-29, possibly because some models are still holding on to greater snow coverage than actually exists. For this reason, have maintained high temperatures near the 75th percentile of NBM members, which yields highs ranging from lower 50s in southwest MN, to near 70 in south central SD.

Gusty afternoon winds, along with well above normal temps and dry fuels result in low humidity levels Saturday afternoon, especially in south central SD. Humidity levels, even in Gregory County, are marginal for hitting red flag conditions, but feel the dormant fuels and potential for winds gusting to 30 mph or greater at times will be able to overcome the marginal humidity. Thus have hoisted a Red Flag Warning for Gregory County Saturday afternoon/early evening.

LONG TERM. (Saturday Night through Friday) Issued at 259 PM CST Fri Mar 5 2021

Focus through the early part of next week will be on continued well above normal temperatures and associated elevated fire danger. For Sunday, a weak cool front pushes into the forecast area through the day. This will promote deeper mixing with a westerly component to the low level winds, so anticipate most areas climbing into the 60s to near 70. The boundary will bring a weaker pressure gradient, though, so not expecting winds to be as strong across our western areas where afternoon humidity values will be lowest. Thus should remain shy of red flag criteria on Sunday, though fire danger will still be elevated across the forecast area. Similar situation the first couple days of the work week, with varying degrees of gusty winds driving fire danger to the High or Very High category through Tuesday. Low level thermal profiles continue to support pushing NBM highs upward toward the 75th percentile, which will yield mid 60s to mid 70s both Monday and Tuesday.

Pattern changing trough pushes across the region Tuesday night into Wednesday, bringing a chance of at least scattered precipitation, and perhaps a little thunder ahead of the cool front Tuesday night. Cooler, but still above normal temperatures settle into the region for the latter part of the week ahead.

AVIATION. (For the 00Z TAFS through 00Z Saturday evening) Issued at 530 PM CST Fri Mar 5 2021

Like last night, some uncertainty on where stratus and fog will redevelop tonight. Current indications point to MVFR ceilings drifting southwest to dissipate but hang around into the early overnight hours. Greatest risks for fog will be again focused west of the James river and again along the Buffalo Ridge. Elsewhere, lighter fog may be possible.

Fog/stratus will dissipate through tomorrow morning as an east to southeast wind turns gusty through the day.

FIRE WEATHER. Issued at 259 PM CST Fri Mar 5 2021

Gusty afternoon winds, along with well above normal temps and dry fuels result in low humidity levels Saturday afternoon, especially in south central SD. Humidity levels, even in Gregory County, are marginal for hitting red flag conditions, but feel the dormant fuels and potential for winds gusting to 30 mph or greater at times will be able to overcome the marginal humidity. Thus have hoisted a Red Flag Warning for Gregory County Saturday afternoon/early evening.

Elevated fire danger will persist through the first half of next week, generally High to Very High fire danger, largely driving by periods of gusty southeast to south winds. A cool front pushes through the region Tuesday night, which should tame fire weather concerns for the latter part of the week.

FSD WATCHES/WARNINGS/ADVISORIES. SD . Red Flag Warning from noon to 8 PM CST Saturday for SDZ050.

MN . NONE. IA . NONE. NE . NONE.

SHORT TERM . JH LONG TERM . JH AVIATION . Dux FIRE WEATHER . JH


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yankton, Chan Gurney Municipal Airport, SD2 mi53 minENE 410.00 miFair50°F37°F61%1026.3 hPa

Link to 5 minute data for KYKN

Wind History from YKN (wind in knots)
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Last 24hrE8E8E9E7E6E6E6E6CalmCalmE3CalmCalmSE4S533Calm34NE4NE5NE6NE4
1 day agoSE6SE7E5E8E7E7E7E7E5E5E5E6E7E7E9E9E11
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2 days agoS5SW5W8CalmCalmNW3NW3CalmNW3NW4CalmCalmCalmCalmNE34SE4E6SW10S9S6S7SE6SE4

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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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