Alert archive / South Dakota / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 9, NWS Sioux Falls, SD

April 13, 2026Lincoln County, Minnehaha County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 13, 2026, 6:11 PM CDT for Lincoln County, Minnehaha County, South Dakota. It was in force for 49 min. 14 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: Apr 13, 2026, 6:11 PM CDT (23:11 UTC)
Expired: Apr 13, 2026, 7:00 PM CDT
In force: 49 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Lincoln County, SD, Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 3 km from the middle of the area, began a volume at 23:15 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
Apr 13, 6:12 PM CDT	HAIL 0.5	4 N Tea, SD	Report from mPING: Half-inch (0.50 in.).
Apr 13, 6:13 PM CDT	HAIL 1	5 W Sioux Falls, SD
Apr 13, 6:14 PM CDT	HAIL 1.5	Tea, SD
Apr 13, 6:18 PM CDT	HAIL 1.5	4 Wsw Sioux Falls, SD
Apr 13, 6:20 PM CDT	HAIL 1	3 Ene Tea, SD	Penny to quarter size hail.
Apr 13, 6:21 PM CDT	HAIL 1.25	4 Ne Tea, SD
Apr 13, 6:22 PM CDT	HAIL 1	3 Ne Tea, SD
Apr 13, 6:22 PM CDT	HAIL 1	4 Ne Tea, SD
Apr 13, 6:25 PM CDT	HAIL 0.75	2 S Sioux Falls, SD
Apr 13, 6:25 PM CDT	HAIL 1	4 Nnw Harrisburg, SD
Apr 13, 6:29 PM CDT	HAIL 0.75	3 Se Sioux Falls, SD
Apr 13, 6:30 PM CDT	HAIL 0.75	4 E Sioux Falls, SD
Apr 13, 6:30 PM CDT	HAIL 1	4 Se Sioux Falls, SD
Apr 13, 6:32 PM CDT	HAIL 0.75	3 E Sioux Falls, SD

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 9 storm reports to this severe thunderstorm warning; the first came 2 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
Apr 13, 4:39 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.2 hours before the alert went out and 286 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: 8 J/kg
Mixed-layer CIN: -259 J/kg
Mixed-layer LCL: 1506 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

725 
WUUS53 KFSD 132311
SVRFSD
SDC083-099-140000-
/O.NEW.KFSD.SV.W.0009.260413T2311Z-260414T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
611 PM CDT Mon Apr 13 2026

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Eastern Minnehaha County in southeastern South Dakota...
  Northwestern Lincoln County in southeastern South Dakota...

* Until 700 PM CDT.

* At 611 PM CDT, a severe thunderstorm was located near Ellis, or
  near Sioux Falls, moving northeast at 30 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.

* This severe thunderstorm will be near...
  Sioux Falls, Harrisburg, Crooks, and Ellis around 615 PM CDT.
  Brandon and Renner around 620 PM CDT.
  Corson and Rowena around 630 PM CDT.

Other locations in the path of this severe thunderstorm include
Palisades State Park and Valley Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Sioux Falls.

&&

LAT...LON 4367 9646 4355 9645 4340 9681 4344 9690
      4350 9693 4350 9700 4379 9671
TIME...MOT...LOC 2311Z 235DEG 25KT 4351 9685 

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

$$

IG

3 follow-up statements

440 
WWUS53 KFSD 132338
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
638 PM CDT Mon Apr 13 2026

SDC083-099-140000-
/O.CON.KFSD.SV.W.0009.000000T0000Z-260414T0000Z/
Minnehaha SD-Lincoln SD-
638 PM CDT Mon Apr 13 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHEASTERN MINNEHAHA AND NORTHERN LINCOLN COUNTIES...

At 638 PM CDT, a severe thunderstorm was located over Rowena, or near
Sioux Falls, moving east at 30 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...
  Brandon, Valley Springs, Corson and Palisades State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Sioux Falls.

&&

LAT...LON 4367 9646 4355 9645 4347 9667 4355 9675
      4371 9654
TIME...MOT...LOC 2338Z 249DEG 26KT 4354 9660 

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

$$

IG

934 
WWUS53 KFSD 132350
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
650 PM CDT Mon Apr 13 2026

SDC083-140000-
/O.CAN.KFSD.SV.W.0009.000000T0000Z-260414T0000Z/
Lincoln SD-
650 PM CDT Mon Apr 13 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN LINCOLN COUNTY IS
CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Minnesota...and southeastern South Dakota.

&&

LAT...LON 4367 9646 4355 9645 4351 9658 4360 9661
      4365 9651
TIME...MOT...LOC 2350Z 235DEG 25KT 4359 9650 

$$

SDC099-140000-
/O.CON.KFSD.SV.W.0009.000000T0000Z-260414T0000Z/
Minnehaha SD-
650 PM CDT Mon Apr 13 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHEASTERN MINNEHAHA COUNTY...

At 650 PM CDT, a severe thunderstorm was located over Valley Springs,
or 11 miles east of Sioux Falls, moving northeast at 30 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...
Brandon, Valley Springs, Corson, and Rowena.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Sioux Falls.

&&

LAT...LON 4367 9646 4355 9645 4351 9658 4360 9661
      4365 9651
TIME...MOT...LOC 2350Z 235DEG 25KT 4359 9650 

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

$$

IG

280 
WWUS53 KFSD 132357
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
657 PM CDT Mon Apr 13 2026

SDC099-140007-
/O.EXP.KFSD.SV.W.0009.000000T0000Z-260414T0000Z/
Minnehaha SD-
657 PM CDT Mon Apr 13 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MINNEHAHA COUNTY
WILL EXPIRE AT 700 PM CDT...

The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However, heavy
rain is still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Minnesota...and southeastern South Dakota.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sioux Falls.

&&

LAT...LON 4367 9646 4355 9645 4351 9658 4360 9661
      4365 9651
TIME...MOT...LOC 2357Z 235DEG 25KT 4362 9645 

$$

IG

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 Apr 13, 2:50 PM CDT, 3 hours 21 minutes earlier. Its key messages:

Thunderstorms return this afternoon and evening. Scattered strong to severe storms expected - greatest risk for southwestern Minnesota into adjacent areas of South Dakota and northwest Iowa. Timing of greatest concern is 4 to 9 PM.
Main hazards are large hail greater than 2 inches in diameter and wind gusts to 70 mph. A tornado or two are also possible. Have a severe weather plan and multiple ways to receive warnings.
Periodic chances (20-60%) for showers and thunderstorms continue this week. Details remain uncertain at this time.

Area forecast discussion, Apr 13, 2:50 PM CDT, 3 hours 21 minutes before

Area Forecast Discussion
National Weather Service Sioux Falls SD
250 PM CDT Mon Apr 13 2026

.KEY MESSAGES...

- Thunderstorms return this afternoon and evening. Scattered
  strong to severe storms expected - greatest risk for
  southwestern Minnesota into adjacent areas of South Dakota and
  northwest Iowa. Timing of greatest concern is 4 to 9 PM.

- Main hazards are large hail greater than 2 inches in diameter
  and wind gusts to 70 mph. A tornado or two are also possible.
  Have a severe weather plan and multiple ways to receive
  warnings.

- Periodic chances (20-60%) for showers and thunderstorms
  continue this week. Details remain uncertain at this time.

&&

.DISCUSSION...
Issued at 238 PM CDT Mon Apr 13 2026

Scattered thunderstorms are set to develop over the next
few hours, bringing the potential for a few severe storms with large
hail, damaging winds, and perhaps a tornado or two. As of 2 pm,
a surface low is located over northern Nebraska with a warm
front extending northeast of it across far southeastern South
Dakota into northwest Iowa. Dew points in the 60s have been
gradually spreading northward, and these higher dew points are
expected to reach the I-90 corridor over the next couple of
hours. This boundary will be the focus of initial storm
development, with these storms having access to 35-50 kts of
effective bulk shear and 1500-2000 J/kg of MLCAPE. There are
questions though on how much some high clouds have limited the
area from reaching full heating potential, but if a storm can
get going then steep mid level lapse rates of 7.5-8.5 degrees
C/km and mostly straight, elongated hodographs will favor large
hail to around 2 inches in diameter or larger. The secondary
threat will be damaging wind gusts up to 70 mph. If a storm can
get rooted to the aforementioned surface warm front, then a
tornado or two will also be possible. Can't rule out a strong
tornado either, primarily over southwest Minnesota. As the low
pressure system drift across the area, a few additional showers
and storms look to develop farther south across northwest Iowa
(down to about IA Highway-3, or just north of US Highway-20)
within the warm sector around sunset. These storms could also be
on the strong to severe side, with an isolated instance of
quarter sized hail and 60 mph as the threats.

Showers and storms will exit off to our east by the mid
evening hours, leaving mostly quiet conditions in its wake. A few
showers may develop in central South Dakota prior to daybreak
Tuesday, but dry air should win out and prevent most if not all of
this from reaching the ground. Patchy fog will also be possible
by early Tuesday morning across portions of northwest Iowa and
southwest Minnesota as winds turn light and variable overnight
and ample moisture remains in place. Temperatures tonight drop
mainly in the 40s, though some 50s are possible in our
easternmost areas. Low chances for showers continue into the day
on Tuesday, but activity is expected to remain spotty at best
as rain continues to battle a dry sub cloud layer. Highs will
range from the 60s northwest to 70s southeast. Rain chances look
to increase Tuesday night into Wednesday as two shortwave
troughs impact our area. The best chances of rain and storms
look to be over northwest Iowa and adjacent areas of Nebraska,
South Dakota, and Minnesota. At this time, severe weather looks
unlikely with this system as the better instability looks to be
off to our south and east.

Rain and storms exit off to our east by Wednesday night, leading to
a dry Thursday. Winds look to increase on Thursday especially west
of I-29 closer to a deepening surface low, and winds may take on a
southwesterly component especially in south central South Dakota.
This could lead to another day with higher fire danger as
temperatures will be warm and relative humidity values drop to 25%
or below mainly along and west of the James River. Still some
uncertainty into how breezy the winds will be, so keep up to date
with the latest forecast. Not too much time to look into the
extended forecast given the near term severe weather threat, but
guidance is in fairly good agreement that the western trough
will begin to move into our area by the end of the work
week/early weekend. This could bring more rain and storms to our
area on Friday and then colder weather into Saturday as
guidance indicates a stronger push of cold air advection behind
this system.

&&

.AVIATION /18Z TAFS THROUGH 18Z TUESDAY/...
Issued at 1241 PM CDT Mon Apr 13 2026

Isolated to widely scattered showers and storms are expected to
develop this afternoon, especially east of I-29 into southern
Minnesota and northern Iowa. Enough confidence to at least include a
PROB30 group for thunderstorms at KFSD, but it looks like storms
should stay largely east of KSUX and KHON. Storms will be capable of
large hail and damaging winds. Showers and storms will quickly push
off to our east this evening, leading to quieter conditions
overnight. Some patchy fog is possible mainly over portions of
northwest Iowa and southwest Minnesota Tuesday morning.

A frontal system will move across the area today, changing winds
from a more southerly direction to a more northerly direction as we
head into the evening hours. Winds turn mainly light and variable
overnight and stay fairly light through the end of the period.

&&

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

&&

DISCUSSION...Samet
AVIATION...Samet

Hazardous weather outlook, Apr 13, 3:56 PM CDT, 2 hours 15 minutes before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
356 PM CDT Mon Apr 13 2026

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-142100-
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-
356 PM CDT Mon Apr 13 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.

Scattered strong to severe thunderstorms expected Monday afternoon
and evening. Some storms may produce large hail 2 inches in diameter
and damaging wind gusts up to 70 mph. A tornado or two cannot be
ruled out. Greatest risk of storms is north of I-90 between 4 and 10
PM.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

More widespread chances for showers and thunderstorms exists for
Tuesday afternoon into Wednesday. This more active pattern continues
into the weekend.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Apr 13, 4:29 PM CDT, 1 hour 42 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
429 PM CDT Mon Apr 13 2026

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

0400 PM     Hail             4 NW Olivet             43.29N 97.73W
04/13/2026  E1.00 Inch       Hutchinson         SD   Public

&&

TRM

Local storm report, Apr 13, 4:44 PM CDT, 1 hour 27 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
444 PM CDT Mon Apr 13 2026

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

0416 PM     Hail             5 NNE Olivet            43.31N 97.63W
04/13/2026  M1.00 Inch       Hutchinson         SD   Public

&&

TRM

Local storm report, Apr 13, 5:23 PM CDT, 48 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
523 PM CDT Mon Apr 13 2026

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

0440 PM     Hail             3 S Freeman             43.31N 97.44W
04/13/2026  E1.25 Inch       Hutchinson         SD   Public

&&

TRM

Local storm report, Apr 13, 5:30 PM CDT, 41 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
530 PM CDT Mon Apr 13 2026

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

0523 PM     Hail             Moville                 42.49N 96.07W
04/13/2026  E0.50 Inch       Woodbury           IA   Public

&&

TRM

Local storm report, Apr 13, 6:03 PM CDT, 8 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
603 PM CDT Mon Apr 13 2026

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

0551 PM     Hail             Ashton                  43.31N 95.79W
04/13/2026  E0.50 Inch       Osceola            IA   Public

            Report from mPING: Half-inch (0.50 in.).

&&

TRM

Local storm report, Apr 13, 6:09 PM CDT, 2 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
609 PM CDT Mon Apr 13 2026

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

0537 PM     Hail             7 S Remsen              42.71N 95.98W
04/13/2026  E1.25 Inch       Plymouth           IA   Public

&&

TRM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 3:50 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson	40 min
Apr 13, 4:15 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner	45 min
Apr 13, 4:59 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner	30 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 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.