Severe Thunderstorms Expected This Afternoon, Evening

First Alert Weather Dakota News Now
First Alert Weather Dakota News Now(Dakota News Now)
Published: Aug. 28, 2021 at 1:00 PM CDT|Updated: Aug. 28, 2021 at 6:23 PM CDT
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SIOUX FALLS, S.D. (Dakota News Now) -- Strong to severe thunderstorms are expected to develop this afternoon into tonight. Here’s the latest on timing and what to expect

9:20 PM UPDATE: Storms continue to slowly exit the area but we are seeing torrential rainfall in the Sioux Falls area and points east. A FLASH FLOOD WARNING IS in effect until 10:45 pm for parts of Minnehaha and Lincoln counties, including Sioux Falls, until 2 AM for parts of Murray and Pipestone counties, and until 3:15 AM for parts of Redwood county, southeast of Marshall.


6:20 PM UPDATE: Another round of showers and thunderstorms is developing on the back side of a complex of storms that moved through. A possible tornado may have touched down near Lennox and Harrisburg around 4:30 PM. A tornado debris signature was indicated on radar with this storm. We’ll continue to bring updates as necessary, but the TORNADO AND SEVERE THUNDERSTORM WATCHES continue until 9 PM.


4 PM UPDATE: A TORNADO WATCH has been issued until 9 PM for the counties of Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles, Pipestone, Rock, Brookings, Lake and Moody. A SEVERE THUNDERSTORM WATCH has been issued until 9 PM for the counties of Minnehaha, Lincoln, McCook, Hutchinson, Clay, Bon Homme, Turner, Union, Yankton, Lyon, O’Brien, Osceola and Sioux counties.

Severe Weather Watches
Severe Weather Watches(Dakota News Now)


2:50 PM UPDATE: The Storm Prediction Center is now watching the area in red for the possibility of a watch being issued over the next few hours. Also, the latest severe weather outlook from the SPC shows very little change from the last update.

Mesoscale Discussion
Mesoscale Discussion(Dakota News Now)


1 PM UPDATE: Conditions are quiet for right now other than a few pop-up showers and isolated thunderstorms. More thunderstorms are expected to develop beginning as early as 3 PM and will continue through about midnight tonight as a cold front passes through. Storms are expected to become severe once they develop and push east and northeast.

No watches or warnings are in place as of 1 PM, but expect that will change over the coming hours.

Here’s the latest severe weather outlook from the Storm Prediction Center (as of 11:30 AM). An enhanced, level three risk is in place from Mitchell and Sioux Falls, northeast towards Brookings and Marshall. A slight, level two risk is in place east of a line from Leola to Miller to Gregory. The severe risk decreases the further west you go.

Severe Weather Outlook for Saturday
Severe Weather Outlook for Saturday(Dakota News Now)

Should storms become severe, here are the potential hazards with some of the strongest storms. The main hazard looks to be destructive hail and damaging wind gusts that could be over 70-80 mph. A few tornadoes could be possible as well, and torrential downpours could lead to some minor areas of flash flooding.

Severe Weather Threats
Severe Weather Threats(Dakota News Now)

Once the front passes through tonight, the threat for severe weather will begin to diminish and that will lead to a beautiful day Sunday. Until then, be sure to be weather aware this afternoon and evening. Have a way to get those warnings and have a plan in place should severe storms head towards your area. The First Alert Weather Team will be tracking these storms closely and bring you updates on air, online and on our weather app.

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