Alert archive / Minnesota / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 45, NWS Sioux Falls, SD

May 17, 20264 counties in Minnesota; Dickinson County, Osceola County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at May 17, 2026, 6:30 PM CDT for 4 counties in Minnesota; Dickinson County, Osceola County, Iowa. It was in force for 75 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 17, 2026, 6:30 PM CDT (23:30 UTC)
Expired: May 17, 2026, 7:45 PM CDT
In force: 75 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 1.25 in
Wind: 70.0 mph

Counties Dickinson County, IA, Osceola County, IA, Cottonwood County, MN, Jackson County, MN, Murray County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 124 km from the middle of the area, began a volume at 23:29 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
May 17, 6:36 PM CDT	HAIL 0.75	Sibley, IA	Report from mPING: Dime (0.75 in.). Time estimated via radar.
May 17, 6:36 PM CDT	HAIL 0.75	Sibley, IA	Report from mPING: Dime (0.75 in.). Time estimated via radar.
May 17, 6:56 PM CDT	HAIL 1	2 Nw Okabena, MN	In addition to hail up to the size of quarters, winds gusted up about 40 mph and a quick heavy rain occurred. No damage was noticed.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 26 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 17, 1:42 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.5 hours before the alert went out and 190 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1780 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 238 m²/s²
0-3 km storm-relative helicity: 284 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

757 
WUUS53 KFSD 172330
SVRFSD
IAC059-143-MNC033-063-101-105-180045-
/O.NEW.KFSD.SV.W.0045.260517T2330Z-260518T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
630 PM CDT Sun May 17 2026

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Osceola County in northwestern Iowa...
  Dickinson County in northwestern Iowa...
  Jackson County in southwestern Minnesota...
  Eastern Nobles County in southwestern Minnesota...
  Southeastern Murray County in southwestern Minnesota...
  Southern Cottonwood County in southwestern Minnesota...

* Until 745 PM CDT.

* At 629 PM CDT, severe thunderstorms were located along a line
  extending from Fulda to near Round Lake to near Sibley, moving east
  at 35 mph.

  HAZARD...70 mph wind gusts and half dollar size hail.

  SOURCE...Public. At 618 PM CDT, quarter sized hail was reported 5 
           miles southwest of Worthington.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Severe thunderstorms will be near...
  Ocheyedan, Brewster, Round Lake, and Harris around 635 PM CDT.
  Heron Lake around 640 PM CDT.
  Lake Park around 645 PM CDT.

Other locations in the path of these severe thunderstorms include
Lakefield, Windom, Jackson In Jackson County, Kilen Woods State Park,
Spirit Lake, Bergen, Okoboji, Orleans, Wahpeton, Bingham Lake and
West Okoboji.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

A Tornado Watch remains in effect until 1000 PM CDT for northwestern
Iowa...and southwestern Minnesota.

&&

LAT...LON 4350 9491 4345 9491 4333 9505 4329 9585
      4357 9574 4393 9567 4409 9486 4351 9485
TIME...MOT...LOC 2329Z 260DEG 31KT 4387 9559 4357 9550 4335 9574 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

BP

3 follow-up statements

106 
WWUS53 KFSD 172359
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
659 PM CDT Sun May 17 2026

MNC101-180009-
/O.CAN.KFSD.SV.W.0045.000000T0000Z-260518T0045Z/
Murray MN-
659 PM CDT Sun May 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MURRAY COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM CDT for northwestern
Iowa...and southwestern Minnesota.

&&

LAT...LON 4350 9491 4345 9491 4333 9505 4330 9569
      4355 9567 4371 9557 4385 9546 4397 9547
      4409 9486 4351 9485
TIME...MOT...LOC 2359Z 260DEG 31KT 4391 9526 4361 9518 4339 9542 

$$

IAC059-143-MNC033-063-105-180045-
/O.CON.KFSD.SV.W.0045.000000T0000Z-260518T0045Z/
Osceola IA-Dickinson IA-Jackson MN-Nobles MN-Cottonwood MN-
659 PM CDT Sun May 17 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR EASTERN OSCEOLA...DICKINSON...JACKSON...SOUTHEASTERN NOBLES AND
SOUTHERN COTTONWOOD COUNTIES...

At 659 PM CDT, severe thunderstorms were located along a line
extending from 7 miles west of Windom to near Lakefield to near
Harris, moving east at 35 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
  Windom, Jackson In Jackson County, Lake Park, Orleans, Kilen Woods 
  State Park, Spirit Lake, Bergen, Okoboji, Wahpeton, Bingham Lake, 
  Arnolds Park, West Okoboji, Mountain Lake and Superior.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for northwestern
Iowa...and southwestern Minnesota.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4350 9491 4345 9491 4333 9505 4330 9569
      4355 9567 4371 9557 4385 9546 4397 9547
      4409 9486 4351 9485
TIME...MOT...LOC 2359Z 260DEG 31KT 4391 9526 4361 9518 4339 9542 

TORNADO...POSSIBLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BP

689 
WWUS53 KFSD 180014
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
714 PM CDT Sun May 17 2026

IAC059-143-MNC105-180023-
/O.CAN.KFSD.SV.W.0045.000000T0000Z-260518T0045Z/
Osceola IA-Dickinson IA-Nobles MN-
714 PM CDT Sun May 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN OSCEOLA...DICKINSON
AND SOUTHEASTERN NOBLES COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM CDT for northwestern
Iowa...and southwestern Minnesota.

&&

LAT...LON 4350 9500 4350 9531 4366 9530 4382 9541
      4396 9529 4403 9486 4351 9485
TIME...MOT...LOC 0013Z 262DEG 31KT 4388 9513 4360 9502 4347 9510 

$$

MNC033-063-180045-
/O.CON.KFSD.SV.W.0045.000000T0000Z-260518T0045Z/
Jackson MN-Cottonwood MN-
714 PM CDT Sun May 17 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR JACKSON AND SOUTHEASTERN COTTONWOOD COUNTIES...

At 713 PM CDT, severe thunderstorms were located along a line
extending from Windom to near Jackson In Jackson County to Orleans,
moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Windom, Jackson In Jackson County, Mountain Lake, Lakefield, Bergen,
Heron Lake, Bingham Lake, Kilen Woods State Park, Okabena, Alpha,
Wilder, and Delft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for northwestern
Iowa...and southwestern Minnesota.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4350 9500 4350 9531 4366 9530 4382 9541
      4396 9529 4403 9486 4351 9485
TIME...MOT...LOC 0013Z 262DEG 31KT 4388 9513 4360 9502 4347 9510 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BP

039 
WWUS53 KFSD 180042
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
742 PM CDT Sun May 17 2026

MNC033-063-180050-
/O.EXP.KFSD.SV.W.0045.000000T0000Z-260518T0045Z/
Jackson MN-Cottonwood MN-
742 PM CDT Sun May 17 2026

...THE SEVERE THUNDERSTORM WARNING FOR JACKSON AND SOUTHEASTERN
COTTONWOOD COUNTIES WILL EXPIRE AT 745 PM CDT...

A Tornado Watch remains in effect until 1000 PM CDT for northwestern
Iowa...and southwestern Minnesota.

Remember, a Tornado Warning still remains in effect for a small 
portion of Cottonwood county and Jackson counties in Minnesota 
until 745pm!

&&

LAT...LON 4350 9500 4350 9531 4366 9530 4382 9541
      4396 9529 4403 9486 4351 9485
TIME...MOT...LOC 0040Z 260DEG 31KT 4392 9482 4364 9471 4351 9479 

$$

Meyers

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at May 17, 1:20 PM CDT, 5 hours 10 minutes earlier. Its key messages:

There is high confidence that severe thunderstorms will develop this afternoon and evening, producing large hail, destructive straight-line winds, and a few tornadoes. An Enhanced Risk (level 3 of 5) of severe storms is in place.
A transitioning storm mode will shift hazards from large hail and tornadoes initially, to widespread wind damage as an intense line of storms tracks east of Interstate 29 this evening.
A lower risk of severe weather exists late Monday afternoon and evening, mainly over northwest IA, before quieter weather moves in for the mid-week period.

Area forecast discussion, May 17, 1:20 PM CDT, 5 hours 10 minutes before

Area Forecast Discussion
National Weather Service Sioux Falls SD
Issued by National Weather Service Lincoln IL
120 PM CDT Sun May 17 2026

.KEY MESSAGES...

- There is high confidence that severe thunderstorms will
  develop this afternoon and evening, producing large hail,
  destructive straight-line winds, and a few tornadoes. An
  Enhanced Risk (level 3 of 5) of severe storms is in place.

- A transitioning storm mode will shift hazards from large hail
  and tornadoes initially, to widespread wind damage as an
  intense line of storms tracks east of Interstate 29 this
  evening.

- A lower risk of severe weather exists late Monday afternoon
  and evening, mainly over northwest IA, before quieter weather
  moves in for the mid-week period.

&&

.DISCUSSION...
Issued at 120 PM CDT Sun May 17 2026

The short-term convective outlook presents a highly volatile
spring severe weather setup. Latest surface analysis shows a
complex pattern, anchored by a strong 994 mb low over northwest
KS. An inverted trough extended north of the low through
central SD, while a well-defined warm front stretched northeast
of the low into east central NE. A weaker low was also noted in
north central NE. Visible satellite imagery revealed stable
wave clouds advancing northeast over far northeast NE and
extreme SE SD, ahead of the advancing warm front. Regional
radar imagery showed a complex of strong to severe storms over
north central NE. This storm complex is forecast by short range
guidance to continue tracking east this afternoon, intensifying
as interacts with the richer low- level moisture pool near and
south of the warm front.

Moderate to strong instability will be in place over the
southern to eastern CWA by late afternoon with MLCAPE nearing
3000 J/kg. In addition, deep layer shear will increase to around
50 kt, coincident with a mid level speed max ejecting from the
deep upper trough to our west. As the system evolves over the
next several hours, it appears the ingredients for a significant
severe weather event will be most favored over the southern to
eastern CWA. Ahead of the main convective line, some CAMs show
supercell development along the northward advancing warm front.
These storms would present a risk of very large hail (2"+) and
tornadoes. Given the amount of low level SRH/curved hodographs
present, a couple strong tornadoes are possible. The convective
cluster currently entering our far southwest CWA should
strengthen as it shifts east, with an initial hail and tornado
threat transitioning to a damaging straight line wind threat
(70+ MPH) as it grows upscale into a squall line/QLCS. Some
line-embedded QLCS tornadoes are possible, especially for any
line segments that become oriented north/south or
northwest/southeast, given southwesterly 0-3 km shear vectors.
Timing from latest high-res guidance suggests this activity
exits to the east of our CWA late this evening.

Precipitation amounts will vary significantly based on convective
tracks, though NBM guidance and HREF probability match mean
fields project a widespread 0.50 to 1.50 inches of rainfall,
particularly across northwest Iowa and southwest Minnesota. On
Monday, the cold front finally pushes into the area. Instability
and shear are forecast to be much lower than today, however,
there will be a conditional risk of severe storms over the
eastern CWA during the late afternoon to evening, if the airmass
can destabilize sufficiently ahead of the front. SPC's Day 2
outlook indicates as Marginal Risk (level 1 of 5), for our MN
and IA counties.

Behind the departing upper wave, quasi-zonal flow sets up for
Tuesday and Wednesday, yielding quiet conditions and seasonally
cool high temperatures moderating from the upper 50s Tuesday to
mid-upper 60s Wednesday.

The next upper wave moves in for the Thursday to Friday period,
however Gulf moisture remains cutoff ahead of this system.
Evaluating the ECMWF Extreme Forecast Index (EFI) reveals no
significant climatological anomalies for precipitation or wind
across the upper Midwest during this period, reinforcing the
the idea of a low-impact system for our area. The current
forecast sticks closely to the NBM consensus, maintaining broad
20-30 percent probabilities for light rain for late Thursday
into Saturday.

By late this week and especially this weekend, temperatures
will embark on a steady upward trajectory, as the mid level flow
backs west, then southwest. The Climate Prediction Center (CPC)
6-10 day outlook favors above-normal temperatures across the
Northern Plains and Upper Midwest, which supports blended
guidance high temperatures reaching well into the 80s on
Sunday.

&&

.AVIATION /18Z TAFS THROUGH 18Z MONDAY/...
Issued at 1248 PM CDT Sun May 17 2026

Showers and storms move through the region this afternoon into
tonight. Intermittent MVFR/IFR conditions will be possible throughout
this timeframe, especially in heavier rain. TSRA was included at
least in PROB30 groups, but is expected to be the dominant weather
type at times. Widespread MVFR/IFR cigs setting in overnight for much
of Monday.

&&

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

&&

DISCUSSION...ILX/25
AVIATION...DYE

Hazardous weather outlook, May 17, 1:29 PM CDT, 5 hours 1 minute before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
Issued by National Weather Service Lincoln IL
129 PM CDT Sun May 17 2026

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-181830-
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory-
Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-
Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton-
Union-
129 PM CDT Sun May 17 2026

This Hazardous Weather Outlook is for northwest Iowa, west central
Iowa, southwest Minnesota, northeast Nebraska, central South
Dakota, east central South Dakota, south central South Dakota and
southeast South Dakota.

.DAY ONE...This afternoon and tonight.

A significant severe weather event is possible this afternoon and
evening. Very large hail, damaging wind gusts, and tornadoes are all
possible. If you have outdoor plans know where your nearest shelter
is located. Please ensure you have multiple ways to receive warnings.
Have a plan to take shelter and act immediately if your area comes
under a severe weather warning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Strong to severe storms are possible again Monday afternoon and
evening, particularly over northwest Iowa and southwest Minnesota.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed this afternoon and evening.

In the hours before

Local storm report, May 17, 5:55 PM CDT, 35 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
555 PM CDT Sun May 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0554 PM     Hail             Lismore                 43.75N 95.95W
05/17/2026  E1.75 Inch       Nobles             MN   Public

&&

TH

Local storm report, May 17, 6:02 PM CDT, 28 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
602 PM CDT Sun May 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0551 PM     Hail             Rock Valley             43.20N 96.30W
05/17/2026  M0.75 Inch       Sioux              IA   Public

            mPING: Dime (0.75 in.). Time estimated via
            radar.

&&

ak

Local storm report, May 17, 6:05 PM CDT, 25 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
605 PM CDT Sun May 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0544 PM     Tstm Wnd Gst     4 NE Adrian             43.68N 95.89W
05/17/2026  M62 MPH          Nobles             MN   Public

            Via personal weather station. Exact time
            estimated via radar.

&&

ak

Local storm report, May 17, 6:16 PM CDT, 14 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
616 PM CDT Sun May 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0409 PM     Tstm Wnd Dmg     3 E Parker              43.39N 97.08W
05/17/2026                   Turner             SD   Public

            Power poles snapped and irrigation pivots
            flipped near the intersection of 276th St
            and 456th Ave. Time estimated from radar.

&&

PR

Local storm report, May 17, 6:19 PM CDT, 11 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
619 PM CDT Sun May 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0615 PM     Tornado          3 SW Worthington        43.60N 95.64W
05/17/2026                   Nobles             MN   Trained Spotter

            Unconfirmed report of tornado approximately
            1 mile southwest of Worthington. Debris
            currently being observed.

&&

ak

Local storm report, May 17, 6:24 PM CDT, 6 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
624 PM CDT Sun May 17 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0618 PM     Hail             5 SW Worthington        43.57N 95.65W
05/17/2026  M1.00 Inch       Nobles             MN   Public

            Report from mPING: Time estimated via radar.

&&

ak

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 4:18 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Rock	42 min
May 17, 4:56 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Nobles, Rock	49 min
May 17, 5:33 PM CDT	Tornado Warning	FSD	Nobles, Rock	42 min
May 17, 5:43 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Murray, Nobles, Rock	62 min
May 17, 6:12 PM CDT	Tornado Warning	FSD	Jackson, Nobles	48 min
May 17, 6:57 PM CDT	Tornado Warning	FSD	Cottonwood, Jackson	48 min
May 16, 11:14 PM CDT	Severe Thunderstorm Warning	FSD	Clay, O'Brien	16 min
May 17, 1:10 AM CDT	Flash Flood Warning	FSD	Plymouth	4 hr
May 17, 4:27 PM CDT	Tornado Warning	FSD	Lyon	48 min
May 17, 5:56 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, O'Brien, Osceola, Sioux	27 min
May 17, 6:33 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Sioux	57 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2026 Severe Thunderstorm Warnings in Iowa, 2026 Every severe thunderstorm warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.