Alert archive / Minnesota / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 49, NWS Duluth, MN

June 23, 2025Cook County, Lake County, Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jun 23, 2025, 4:27 AM CDT for Cook County, Lake County, Saint Louis County, Minnesota. It was in force for 63 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 23, 2025, 4:27 AM CDT (09:27 UTC)
Expired: Jun 23, 2025, 5:30 AM CDT
In force: 63 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cook County, MN, Lake County, MN, Saint Louis County, MN

The radar

The Duluth radar (KDLH), 106 km from the middle of the area, began a volume at 09:29 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.

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 9.5 hours before the alert went out and 171 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: 1210 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 688 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 518 m²/s²
0-3 km storm-relative helicity: 797 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 35.4

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 23, 3:19 AM CDT, 1 hour 8 minutes earlier.

Area forecast discussion, Jun 23, 3:19 AM CDT, 1 hour 8 minutes before

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Hazardous weather outlook, Jun 23, 2:21 AM CDT, 2 hours 6 minutes before

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In the hours before

Local storm report, Jun 23, 2:29 AM CDT, 1 hour 58 minutes before

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Local storm report, Jun 23, 3:07 AM CDT, 1 hour 20 minutes before

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Local storm report, Jun 23, 3:10 AM CDT, 1 hour 17 minutes before

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Local storm report, Jun 23, 4:16 AM CDT, 11 minutes before

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Local storm report, Jun 23, 4:18 AM CDT, 9 minutes before

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Local storm report, Jun 23, 4:19 AM CDT, 8 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 22, 8:37 PM CDT	Tornado Warning	DLH	Koochiching	23 min
Jun 22, 8:55 PM CDT	Tornado Warning	DLH	Koochiching	50 min
Jun 22, 9:16 PM CDT	Dense Fog Advisory	DLH	Carlton, Saint Louis	9 hr
Jun 22, 9:19 PM CDT	Severe Thunderstorm Warning	DLH	Koochiching	56 min
Jun 22, 9:28 PM CDT	Tornado Warning	DLH	Koochiching	32 min
Jun 23, 1:41 AM CDT	Small Craft Advisory	DLH		14 hr
Jun 23, 2:11 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Cass, Crow Wing, Itasca	64 min
Jun 23, 2:47 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin	28 min
Jun 23, 3:02 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DLH	Aitkin, Carlton, Itasca, Saint Louis	58 min
Jun 23, 3:59 AM CDT	Severe Thunderstorm Warning	DLH	Lake, Saint Louis	46 min
Jun 23, 4:35 AM CDT	Special Marine Warning	DLH		55 min
Jun 23, 5:25 AM CDT	Special Marine Warning	DLH		35 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.