Alert archive / Minnesota / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 78, NWS Duluth, MN

August 21, 2013Itasca County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Aug 21, 2013, 3:11 AM CDT for Itasca County, Minnesota. It was in force for 34 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
Aug 21, 2013, 3:11 AM CDT (08:11 UTC)
Expired
Aug 21, 2013, 3:45 AM CDT
In force
34 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Itasca County, MN

The radar

The Duluth radar (KDLH), 131 km from the middle of the area, began a volume at 08:15 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, 8.2 hours before the alert went out and 120 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-pSkew-T log-p diagram, International Fa, MN at 00:00Z on 2013-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3258 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 00:00Z on 2013-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3258 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1459 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.8

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 Aug 21, 2:45 AM CDT, 26 minutes earlier.

Area forecast discussion, Aug 21, 2:45 AM CDT, 26 minutes before
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Hazardous weather outlook, Aug 20, 8:58 PM CDT, 6 hours 13 minutes before
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In the hours before

Special weather statement, Aug 21, 2:29 AM CDT, 42 minutes before
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Special weather statement, Aug 21, 2:34 AM CDT, 37 minutes before
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Special weather statement, Aug 21, 2:38 AM CDT, 33 minutes before
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Special weather statement, Aug 21, 2:54 AM CDT, 17 minutes before
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Special weather statement, Aug 21, 3:01 AM CDT, 10 minutes before
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Special weather statement, Aug 21, 3:05 AM CDT, 6 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 11:04 PM CDTSpecial Weather StatementDLH56 min
Aug 21, 1:23 AM CDTSpecial Weather StatementDLHItasca37 min
Aug 21, 1:26 AM CDTSpecial Weather StatementDLHItasca34 min
Aug 21, 1:48 AM CDTSpecial Weather StatementDLH27 min
Aug 21, 1:56 AM CDTSpecial Weather StatementDLHKoochiching34 min
Aug 21, 2:05 AM CDTSpecial Weather StatementDLHItasca, Saint Louis25 min
Aug 21, 2:29 AM CDTSpecial Weather StatementDLHKoochiching31 min
Aug 21, 2:34 AM CDTSpecial Weather StatementDLHSaint Louis26 min
Aug 21, 2:38 AM CDTSpecial Weather StatementDLHItasca22 min
Aug 21, 2:54 AM CDTSpecial Weather StatementDLHItasca36 min
Aug 21, 3:01 AM CDTSpecial Weather StatementDLHSaint Louis29 min
Aug 21, 3:05 AM CDTSpecial Weather StatementDLHSaint Louis25 min
Aug 21, 3:34 AM CDTSpecial Weather StatementDLHItasca26 min
Aug 21, 3:45 AM CDTSpecial Weather StatementDLHSaint Louis30 min
Aug 21, 4:14 AM CDTSpecial Weather StatementDLHSaint Louis31 min
Aug 21, 4:16 AM CDTSpecial Weather StatementDLHLake29 min
Aug 21, 4:18 AM CDTSpecial Weather StatementDLHSaint Louis27 min
Aug 21, 2:04 PM CDTSpecial Weather StatementDLHAshland26 min
Aug 21, 2:16 PM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Iron44 min
Aug 21, 2:37 PM CDTSpecial Weather StatementDLHIron23 min
Aug 21, 2:45 PM CDTSpecial Weather StatementDLHWashburn30 min
Aug 21, 3:10 PM CDTSpecial Weather StatementDLHIron, Sawyer35 min
Aug 21, 3:53 PM CDTSpecial Weather StatementDLHPrice22 min
Aug 21, 4:26 PM CDTSpecial Weather StatementDLHPrice34 min
Aug 21, 4:43 PM CDTSevere Thunderstorm WarningDLHPrice47 min
Aug 21, 5:28 PM CDTSevere Thunderstorm WarningDLHPrice47 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2013Every severe thunderstorm warning in 2013

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.