Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 16, NWS Duluth, MN

July 4, 2020Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 4, 2020, 6:15 PM CDT for Saint Louis County, Minnesota. It was in force for 30 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: Jul 4, 2020, 6:15 PM CDT (23:15 UTC)
Expired: Jul 4, 2020, 6:45 PM CDT
In force: 30 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Saint Louis County, MN

The radar

The Duluth radar (KDLH), 86 km from the middle of the area, began a volume at 23:17 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 12:00Z, 11.3 hours before the alert went out and 126 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: 173 J/kg
Mixed-layer CIN: -204 J/kg
Mixed-layer LCL: 1871 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: -16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 4, 2:59 PM CDT, 3 hours 16 minutes earlier.

Area forecast discussion, Jul 4, 2:59 PM CDT, 3 hours 16 minutes before

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Hazardous weather outlook, Jul 4, 3:05 PM CDT, 3 hours 10 minutes before

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In the hours before

Special weather statement, Jul 4, 4:49 PM CDT, 1 hour 26 minutes before

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Special weather statement, Jul 4, 5:00 PM CDT, 1 hour 15 minutes before

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Special weather statement, Jul 4, 5:11 PM CDT, 1 hour 4 minutes before

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Special weather statement, Jul 4, 5:25 PM CDT, 50 minutes before

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Special weather statement, Jul 4, 5:55 PM CDT, 20 minutes before

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Special weather statement, Jul 4, 5:57 PM CDT, 18 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
Jul 4, 2:30 PM CDT	Special Weather Statement	DLH		30 min
Jul 4, 2:35 PM CDT	Special Weather Statement	DLH	Saint Louis	10 min
Jul 4, 2:36 PM CDT	Special Weather Statement	DLH	Saint Louis	9 min
Jul 4, 3:50 PM CDT	Special Weather Statement	DLH		10 min
Jul 4, 4:49 PM CDT	Special Weather Statement	DLH	Saint Louis	11 min
Jul 4, 5:00 PM CDT	Special Weather Statement	DLH	Saint Louis	30 min
Jul 4, 5:11 PM CDT	Special Weather Statement	DLH	Saint Louis	19 min
Jul 4, 5:25 PM CDT	Special Weather Statement	DLH	Saint Louis	20 min
Jul 4, 5:55 PM CDT	Special Weather Statement	DLH	Saint Louis	20 min
Jul 4, 5:57 PM CDT	Special Weather Statement	DLH	Saint Louis	18 min
Jul 4, 6:22 PM CDT	Special Weather Statement	DLH	Saint Louis	8 min
Jul 4, 6:30 PM CDT	Special Weather Statement	DLH	Saint Louis	15 min
Jul 4, 6:46 PM CDT	Special Weather Statement	DLH	Saint Louis	14 min
Jul 4, 6:55 PM CDT	Special Weather Statement	DLH	Saint Louis	20 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2020 Every severe thunderstorm warning in 2020

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.