Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 162, NWS Duluth, MN

July 23, 2011Cass County, Crow Wing County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 23, 2011, 5:29 AM CDT for Cass County, Crow Wing County, Minnesota. It was in force for 46 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 23, 2011, 5:29 AM CDT (10:29 UTC)
Expired: Jul 23, 2011, 6:15 AM CDT
In force: 46 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cass County, MN, Crow Wing County, MN

The radar

The Duluth radar (KDLH), 152 km from the middle of the area, began a volume at 10:30 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

Minneapolis, MN (KMPX), launched 00:00Z, 10.5 hours before the alert went out and 213 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: 2607 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1019 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.6

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 23, 3:37 AM CDT, 1 hour 52 minutes earlier.

Area forecast discussion, Jul 23, 3:37 AM CDT, 1 hour 52 minutes before

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Hazardous weather outlook, Jul 23, 4:31 AM CDT, 58 minutes before

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In the hours before

Special weather statement, Jul 23, 4:39 AM CDT, 50 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 23, 4:39 AM CDT	Special Weather Statement	DLH	Cass, Crow Wing, Itasca, Koochiching	2 hr
Jul 23, 5:52 AM CDT	Severe Thunderstorm Warning	DLH	Cass	30 min
Jul 23, 6:10 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Cass, Crow Wing, Itasca	50 min
Jul 23, 6:43 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin	30 min
Jul 23, 7:19 AM CDT	Special Weather Statement	DLH	Carlton, Pine, Saint Louis	41 min
Jul 23, 7:46 AM CDT	Special Weather Statement	DLH	Carlton, Pine, Saint Louis	44 min
Jul 23, 7:52 AM CDT	Special Marine Warning	DLH		83 min
Jul 23, 8:52 AM CDT	Flash Flood Warning	DLH	Saint Louis	71 min
Jul 23, 9:52 AM CDT	Special Marine Warning	DLH		53 min
Jul 23, 6:49 PM CDT	Special Weather Statement	DLH	Aitkin, Crow Wing	41 min
Jul 23, 9:05 AM CDT	Special Weather Statement	DLH	Bayfield, Burnett, Douglas, Sawyer, Washburn	25 min
Jul 23, 9:54 AM CDT	Special Weather Statement	DLH	Ashland, Iron, Price, Sawyer	81 min
Jul 23, 10:47 AM CDT	Special Weather Statement	DLH	Ashland, Iron, Price	43 min
Jul 23, 11:07 AM CDT	Special Weather Statement	DLH	Price	38 min
Jul 23, 1:52 PM CDT	Special Weather Statement	DLH	Burnett	53 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011 Every severe thunderstorm warning in 2011

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.