Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 216, NWS Duluth, MN

October 7, 20114 counties in Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Oct 7, 2011, 9:37 PM CDT for 4 counties in Minnesota. It was in force for 38 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: Oct 7, 2011, 9:37 PM CDT (02:37 UTC)
Expired: Oct 7, 2011, 10:15 PM CDT
In force: 38 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Aitkin County, MN, Cass County, MN, Crow Wing County, MN, Itasca County, MN

The radar

The Duluth radar (KDLH), 126 km from the middle of the area, began a volume at 02:36 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.6 hours before the alert went out and 227 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: 11 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 1831 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 367 m²/s²
0-3 km storm-relative helicity: 569 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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 Oct 7, 6:34 PM CDT, 3 hours 3 minutes earlier.

Area forecast discussion, Oct 7, 6:34 PM CDT, 3 hours 3 minutes before

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Hazardous weather outlook, Oct 7, 3:13 PM CDT, 6 hours 24 minutes before

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In the hours before

Special weather statement, Oct 7, 4:55 PM CDT, 4 hours 42 minutes before

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Special weather statement, Oct 7, 6:38 PM CDT, 2 hours 59 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 7:49 PM CDT	Special Weather Statement	DLH	Koochiching	26 min
Oct 7, 8:48 PM CDT	Special Weather Statement	DLH		12 min
Oct 7, 10:12 PM CDT	Special Weather Statement	DLH	Aitkin, Cass, Crow Wing, Itasca, Saint Louis	78 min
Oct 7, 11:10 PM CDT	Special Weather Statement	DLH	Saint Louis	50 min
Oct 7, 11:29 PM CDT	Special Weather Statement	DLH	Aitkin, Crow Wing, Itasca, Saint Louis	46 min
Oct 8, 12:41 AM CDT	Special Weather Statement	DLH	Lake	34 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.