Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 39, NWS Duluth, MN

June 21, 2025Bayfield County, Douglas County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at Jun 21, 2025, 3:17 AM CDT for Bayfield County, Douglas County, Wisconsin. It was in force for 43 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, 3:17 AM CDT (08:17 UTC)
Expired: Jun 21, 2025, 4:00 AM CDT
In force: 43 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bayfield County, WI, Douglas County, WI

The radar

The Duluth radar (KDLH), 60 km from the middle of the area, began a volume at 08:18 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, 8.3 hours before the alert went out and 261 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 severe thunderstorm 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 severe thunderstorm warning went out at Jun 21, 2:17 AM CDT, 1 hour earlier.

Area forecast discussion, Jun 21, 2:17 AM CDT, 1 hour before

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Hazardous weather outlook, Jun 21, 2:44 AM CDT, 33 minutes before

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In the hours before

Local storm report, Jun 21, 2:18 AM CDT, 59 minutes before

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Local storm report, Jun 21, 3:13 AM CDT, 4 minutes before

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Local storm report, Jun 21, 3:14 AM CDT, 3 minutes before

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Local storm report, Jun 21, 3:15 AM CDT, 2 minutes before

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Local storm report, Jun 21, 3:16 AM CDT, 1 minute before

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Local storm report, Jun 21, 3:17 AM CDT, 0 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, 12:38 AM CDT	Tornado Warning	DLH	Cass, Itasca	52 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, 3:41 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

Severe Thunderstorm Warnings in Wisconsin, 2025 Every severe thunderstorm warning 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.