Alert archive / Minnesota / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 144, NWS Sioux Falls, SD

June 30, 20264 counties in Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 30, 2026, 2:43 AM CDT for 4 counties in Minnesota. It was in force for 62 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 30, 2026, 2:43 AM CDT (07:43 UTC)
Expired: Jun 30, 2026, 3:45 AM CDT
In force: 62 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Cottonwood County, MN, Jackson County, MN, Murray County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 106 km from the middle of the area, began a volume at 07:43 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 29, 11:55 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 7.7 hours before the alert went out and 186 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: 4778 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 376 m²/s²
Significant tornado parameter: 6.8
Supercell composite: 41.5

Open this sounding in Storm Lab

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 Jun 30, 12:19 AM CDT, 2 hours 24 minutes earlier. Its key messages:

Isolated to scattered severe thunderstorms have begun this evening and will continue into the overnight hours. The more concerning threat will possibly come from about 11 pm through 4 am in and near northwest IA where wind gusts to 80 mph, hail to ping pong ball and locally heavy rain will be possible.
The heat headlines will continue into this evening. After today, the heat index for most of the area should remain below 100 degrees through the week. There may be a few times when heat headlines are needed with the better chances in northwest IA. Moderate to major heat risks are expected however through the week.
An active pattern this week leads to periodic threats for locally heavy rain and scattered severe storms. At this time the better chances appear to be Tuesday night and Thursday into Thursday night.

Area forecast discussion, Jun 30, 12:19 AM CDT, 2 hours 24 minutes before

Area Forecast Discussion
National Weather Service Sioux Falls SD
1219 AM CDT Tue Jun 30 2026

.KEY MESSAGES...

- Isolated to scattered severe thunderstorms have begun this
  evening and will continue into the overnight hours. The more
  concerning threat will possibly come from about 11 pm through
  4 am in and near northwest IA where wind gusts to 80 mph, hail
  to ping pong ball and locally heavy rain will be possible.

- The heat headlines will continue into this evening. After
  today, the heat index for most of the area should remain below
  100 degrees through the week. There may be a few times when
  heat headlines are needed with the better chances in northwest
  IA. Moderate to major heat risks are expected however through
  the week.

- An active pattern this week leads to periodic threats for
  locally heavy rain and scattered severe storms. At this time
  the better chances appear to be Tuesday night and Thursday
  into Thursday night.

&&

.UPDATE...
Issued at 710 PM CDT Mon Jun 29 2026

As of 7:00 pm CDT, storms have begun to fire along a cold front
draped from Niobrara, Nebraska through Sioux Falls into eastern
North Dakota and western Minnesota. Storms are expected to move
northeast with the front through the next few hours, impacting
eastern South Dakota and western Minnesota and Iowa. Storms have the
potential to become severe and produce winds up to 80 mph, hail up
to the size of ping-pong balls, and brief heavy downpours. Though
the risk is low, a tornado or two cannot be ruled out. This first
round of storms looks to move out of the region by around 11 pm.

A second round of storms are expected to form as a weak wave pushes
northeast out of Nebraska after midnight. Threats will be very
similar, very strong damaging wind gusts, large hail, heavy rain,
and possibly a tornado. This second round is expected to have the
largest impacts along and east of a line from Yankton, to Sioux
Falls, to Marshall, Minnesota. This round should be clear of the
area around or shortly after 7 am Tuesday.

&&

.DISCUSSION...
Issued at 108 PM CDT Mon Jun 29 2026

Late this afternoon and Tonight:

An unstable environment will be in place today as a weak front works
into areas between about the James River and I-29 this afternoon.
This may be a focus for isolated thunderstorms as a weak wave begins
to move northeast from Nebraska ahead of the main wave to the west
of the area. CAPE values sitting around 3000 J/kg with the 0-3km and
0-6km shear values sitting about 30-40 knots. The questions for the
late afternoon and early evening activity will be getting enough
convergence to overcome the capping inversion. However, given these
parameters and a quick look at the model soundings showing a decent
amount of dry air below about 600mb, wind and heavy rain will be the
main threats. Wind gusts to 80 mph and locally heavy rain will be
the main threats. Hail to half dollar will be a threat as well.

Current thoughts are that there will likely be two areas of
convection to watch for. The first will be from roughly 6 pm to 9 pm
along the surface front and more driven by day time heating. This
will likely be near I-29 and is a bit lower confidence given a
strong capping inversion and weak low level convergence. The next,
increasingly more likely threat will be tied to a weak wave moving
out of Nebraska and an increasing LLJ. The better chances for this
will be from about 11 pm to 4 am and this is also when the threat
for the highest winds is expected.

Tuesday into Wednesday:

Tuesday should prove to be a fairly nice, albeit very warm, summer
day with lighter winds and dew points back into the 50s and 60s and
highs from the upper 80s to mid 90s. Currently do not anticipate any
heat headlines but parts of northwest Iowa do get close to a 100
heat index so there will be some potential at least.

Model output continues to point to Tuesday night into Wednesday as a
period with a good chance for showers and thunderstorms. A wave will
rotate northeast through Nebraska and bring a strong increase in the
LLJ into southern SD by about 6z and northwest IA and southwest MN
shortly after. Given the shear profile and expected instability
around 2500 J/kg, a few severe storms will be possible. The low
level remain fairly dry so given the amount of instability we may
see some potential for 75 to 80 mph winds as well as pin pong ball
sized hail.

Wednesday afternoon and evening may see some scattered showers and
storms with the better chances in northwest IA as a front lingers
after the likely morning showers and storms. With the threat for
clouds and a post outflow air mass, heat headlines are again not
expected.

Thursday into the weekend:

The next good chance for showers and thunderstorms moves in Thursday
into Thursday night as another well agreed upon wave moves through.
Will likely continue the threat for locally heavy rain and isolated
severe thunderstorms depending upon where any outflow boundaries end
up.

Friday into the weekend continues the trends of near daily waves as
the upper level flow transitions to a bit more westerly direction.
This hints at a chance for showers and storms Friday and Saturday
with a potential break by Sunday into Monday as a weak ridge aloft
builds in. For now this time frame is pretty low confidence given
all of the activity tonight through Thursday night.

&&

.AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/...
Issued at 1219 AM CDT Tue Jun 30 2026

An earlier line of storms over NW IA/SW MN late this evening
will be followed by another round of thunderstorms lifting from
the southwest overnight, impacting SUX 6-9Z and FSD 7-10Z.
Confidence is currently low that storms will extend as far
northwest as HON. High pressure builds over the region behind
the storms Wednesday resulting in light and variable winds.
Outside of thunderstorms, VFR conditions will prevail through
the period.

&&

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

&&

UPDATE...AJP
DISCUSSION...08
AVIATION...NWS ILX

Hazardous weather outlook, Jun 29, 7:17 PM CDT, 7 hours 26 minutes before

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
717 PM CDT Mon Jun 29 2026

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ040-056-062-066-067-069>071-010030-
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Brookings-Moody-Minnehaha-Turner-Yankton-
Union-
717 PM CDT Mon Jun 29 2026

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

.DAY ONE...Tonight.

Strong to severe thunderstorms may develop this evening. The primary
threats with the strongest storms will be hail up to ping-pong ball
size, damaging wind gusts up to 80 mph, and brief heavy downpours.
Though the risk is low, a tornado or two cannot be ruled out. Storms
may continue into the early morning hours of Tuesday.

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

Isolated severe storms are possible again Tuesday night, and perhaps
again on Wednesday, but confidence in any details is low at this
time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

SDZ038-039-050-052>055-057>061-063>065-068-010030-
Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Lake-Brule-Aurora-
Davison-Hanson-McCook-Charles Mix-Douglas-Hutchinson-Bon Homme-
717 PM CDT Mon Jun 29 2026

This Hazardous Weather Outlook is for central South Dakota, east
central South Dakota, south central South Dakota and southeast
South Dakota.

.DAY ONE...Tonight.

Hazardous weather is not expected at this time.

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

Isolated severe storms are possible again Tuesday night, and perhaps
again on Wednesday, but confidence in any details is low at this
time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Jun 30, 2:11 AM CDT, 32 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
211 AM CDT Tue Jun 30 2026

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

0153 AM     Tstm Wnd Gst     3 ESE Parker            43.37N 97.08W
06/30/2026  M56 MPH          Turner             SD   Mesonet

            Mesonet station 310 SD RWIS Parker.

0155 AM     Tstm Wnd Gst     1 NE Maurice            42.98N 96.17W
06/30/2026  M56 MPH          Sioux              IA   AWOS

            AWOS station KSXK 1 NE Maurice.

&&

Local storm report, Jun 30, 2:14 AM CDT, 29 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
214 AM CDT Tue Jun 30 2026

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

0210 AM     Tstm Wnd Gst     Ashton                  43.31N 95.79W
06/30/2026  M67 MPH          Osceola            IA   Public

            Davis Personal Weather Station.

&&

JH

Local storm report, Jun 30, 2:17 AM CDT, 26 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
217 AM CDT Tue Jun 30 2026

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

0151 AM     Tstm Wnd Gst     Sioux Center            43.08N 96.17W
06/30/2026  M57 MPH          Sioux              IA   Public

            Davis Personal Weather Station.

&&

JH

Local storm report, Jun 30, 2:20 AM CDT, 23 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
220 AM CDT Tue Jun 30 2026

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

0217 AM     Tstm Wnd Gst     3 ENE Melvin            43.30N 95.55W
06/30/2026  E67 MPH          Osceola            IA   Public

            Davis Personal Weather Station.

&&

JH

Local storm report, Jun 30, 2:26 AM CDT, 17 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
226 AM CDT Tue Jun 30 2026

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

0219 AM     Tstm Wnd Gst     3 SE Little Rock        43.41N 95.84W
06/30/2026  M61 MPH          Osceola            IA   Public

            Davis Personal Weather Station.

&&

JH

Local storm report, Jun 30, 2:43 AM CDT, 0 minutes before

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
243 AM CDT Tue Jun 30 2026

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

0235 AM     Tstm Wnd Gst     3 SSE Lake Park         43.40N 95.31W
06/30/2026  M64 MPH          Dickinson          IA   Emergency Mngr

0236 AM     Tstm Wnd Gst     1 S Arnolds Park        43.35N 95.13W
06/30/2026  M59 MPH          Dickinson          IA   Public

            Ambient Personal Weather Station.

0238 AM     Tstm Wnd Gst     2 N Fostoria            43.27N 95.15W
06/30/2026  M75 MPH          Dickinson          IA   Public

            Davis Personal Weather Station.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 7:47 PM CDT	Severe Thunderstorm Warning	FSD	Yankton	28 min
Jun 30, 12:43 AM CDT	Severe Thunderstorm Warning	FSD	Union	19 min
Jun 30, 1:14 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Clay, Union	46 min
Jun 30, 1:34 AM CDT	Severe Thunderstorm Warning	FSD	O'Brien, Sioux	26 min
Jun 30, 1:54 AM CDT	Severe Thunderstorm Warning	FSD	Cherokee, Lyon, O'Brien, Osceola, Plymouth, Sioux	51 min
Jun 30, 2:21 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Clay, Dickinson, O'Brien, Osceola	54 min
Jun 30, 4:37 AM CDT	Flash Flood Warning	FSD	Woodbury	2 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.