Alert archive / Minnesota / Tornado Warnings in 2025

Tornado Warning 16, NWS Duluth, MN

June 21, 2025Cass County, Itasca County, Minnesota

NWS Duluth, MN issued this tornado warning at Jun 21, 2025, 12:38 AM CDT for Cass County, Itasca County, Minnesota. It was in force for 52 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 21, 2025, 12:38 AM CDT (05:38 UTC)
Expired: Jun 21, 2025, 1:30 AM CDT
In force: 52 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Cass County, MN, Itasca County, MN

The radar

The Duluth radar (KDLH), 141 km from the middle of the area, began a volume at 05:36 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 20, 11:18 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 5.6 hours before the alert went out and 157 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: 1249 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1400 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 9.3

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Duluth, MN wrote its last area forecast discussion before this tornado warning went out at Jun 21, 12:19 AM CDT, 19 minutes earlier.

Area forecast discussion, Jun 21, 12:19 AM CDT, 19 minutes before

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Hazardous weather outlook, Jun 20, 10:14 PM CDT, 2 hours 24 minutes before

Hazardous Weather Outlook
National Weather Service Duluth MN
1014 PM CDT Fri Jun 20 2025

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-220315-
Koochiching-North St. Louis-Northern Cook/Northern Lake-
North Itasca-Central St. Louis-Southern Lake/North Shore-
Southern Cook/North Shore-North Cass-South Itasca-South Cass-
Crow Wing-Northern Aitkin-South Aitkin-Carlton/South St. Louis-
Pine-Douglas-Bayfield-Ashland-Iron-Burnett-Washburn-Sawyer-Price-
1014 PM CDT Fri Jun 20 2025

This Hazardous Weather Outlook is for portions of northeast
Minnesota and northwest Wisconsin.

.DAY ONE...Tonight

Severe thunderstorms and flash flooding are possible this evening
and tonight for all of the Northland. Damaging wind up to 80 mph
and large hail to 2 inches in diameter are the primary hazards.
There is also a low end tornado threat in the Brainerd Lakes to
Leech Lake region this afternoon and evening.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Dangerously hot weather is possible Saturday and Sunday. Heat
index values from 95 to 105 degrees are possible.

Additional strong to severe thunderstorms may be possible Sunday
into early Monday.

.SPOTTER INFORMATION STATEMENT...

Skywarn spotter activation will not be needed tonight.

LSZ121-140>148-150-220315-
Bayfield to Oak Point WI-Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-Two Harbors to Duluth MN-
Duluth MN to Port Wing WI-Port Wing to Sand Island WI-
Sand Island to Bayfield WI-Oak Point to Saxon Harbor WI-
Outer Apostle Islands Beyond 5 NM from Mainland-
1014 PM CDT Fri Jun 20 2025

This Hazardous Weather Outlook is for portions of Lake Superior
and the Nearshore waters of western Lake Superior.

.DAY ONE...Tonight

Scattered strong to severe thunderstorms are possible this
evening through early Saturday morning. Damaging wind and large
hail are the primary hazards. Elevated waves and winds gusting
around 25 knots tonight are expected to create conditions
hazardous to small craft around the head of the lake.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Conditions hazardous to small craft are expected to end mid
Saturday morning.

Additional strong to severe thunderstorms are possible Sunday
into Monday.

KML

More information may be obtained at the following web address:
http://www.weather.gov/duluth

In the hours before

Local storm report, Jun 20, 11:53 PM CDT, 45 minutes before

Preliminary Local Storm Report
National Weather Service Duluth MN
1153 PM CDT Fri Jun 20 2025

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

1146 PM     Hail             6 SSW Blackberry        47.11N 93.44W
06/20/2025  M3.00 Inch       Itasca             MN   Public

&&

KML

Local storm report, Jun 21, 12:12 AM CDT, 26 minutes before

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Local storm report, Jun 21, 12:34 AM CDT, 4 minutes before

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The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 11:24 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Cass, Itasca, Saint Louis	66 min
Jun 21, 12:04 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DLH	Cass, Itasca, Koochiching, Saint Louis	56 min
Jun 21, 12:30 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DLH	Cass, Itasca, Koochiching	60 min
Jun 21, 12:45 AM CDT	Special Marine Warning	DLH		45 min
Jun 21, 12:56 AM CDT	Severe Thunderstorm Warning	DLH	Cook, Lake, Saint Louis	64 min
Jun 21, 1:01 AM CDT	Special Marine Warning	DLH		59 min
Jun 21, 1:02 AM CDT	Severe Thunderstorm Warning Destructive damage threat	DLH	Cass, Itasca, Koochiching	58 min
Jun 21, 1:20 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DLH	Aitkin, Cass, Crow Wing, Itasca, Saint Louis	40 min
Jun 21, 1:23 AM CDT	Tornado Warning	DLH	Itasca, Koochiching	22 min
Jun 21, 1:35 AM CDT	Areal Flood Advisory	DLH	Saint Louis	44 min
Jun 21, 1:44 AM CDT	Tornado Warning	DLH	Itasca, Saint Louis	31 min
Jun 21, 1:46 AM CDT	Tornado Warning	DLH	Itasca, Saint Louis	29 min
Jun 21, 1:55 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DLH	Aitkin, Itasca, Koochiching, Lake, Saint Louis	65 min
Jun 21, 1:59 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DLH	Aitkin, Carlton, Cass, Crow Wing, Itasca, Lake and 2 more	61 min
Jun 21, 2:03 AM CDT	Special Marine Warning	DLH		57 min
Jun 21, 2:19 AM CDT	Flash Flood Warning	DLH	Itasca, Saint Louis	4 hr
Jun 21, 2:41 AM CDT	Special Marine Warning	DLH		64 min
Jun 21, 2:53 AM CDT	Special Marine Warning	DLH		67 min
Jun 21, 2:53 AM CDT	Severe Thunderstorm Warning	DLH	Carlton, Cook, Lake, Saint Louis	67 min
Jun 21, 3:29 AM CDT	Special Marine Warning	DLH		61 min
Jun 21, 3:46 AM CDT	Special Marine Warning	DLH		44 min
Jun 21, 3:51 AM CDT	Areal Flood Advisory	DLH	Cook, Lake, Saint Louis	10 hr
Jun 21, 6:22 AM CDT	Areal Flood Advisory	DLH	Itasca, Saint Louis	7 hr
Jun 21, 9:50 AM CDT	Small Craft Advisory	DLH		35 hr
Jun 20, 11:49 PM CDT	Severe Thunderstorm Warning	DLH	Ashland, Bayfield, Sawyer	41 min
Jun 21, 12:44 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DLH	Ashland, Bayfield, Iron	31 min
Jun 21, 3:17 AM CDT	Severe Thunderstorm Warning	DLH	Bayfield, Douglas	43 min
Jun 21, 3:41 AM CDT	Severe Thunderstorm Warning	DLH	Ashland, Bayfield, Douglas, Iron, Price, Sawyer	64 min
Jun 21, 3:42 AM CDT	Severe Thunderstorm Warning	DLH	Ashland, Bayfield, Douglas, Iron, Price, Sawyer	63 min
Jun 21, 4:40 AM CDT	Severe Thunderstorm Warning	DLH	Ashland, Bayfield, Iron, Price, Sawyer	80 min

Nearby

Tornado Warnings in Minnesota, 2025 Every tornado warning in 2025 Tornadoes in 2025

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.