Alert archive / Minnesota / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 53, NWS Duluth, MN

July 18, 2013Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 18, 2013, 8:02 PM CDT for Saint Louis County, Minnesota. It was in force for 28 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 18, 2013, 8:02 PM CDT (01:02 UTC)
Expired: Jul 18, 2013, 8:30 PM CDT
In force: 28 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 01:04 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 18, 4:55 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 1.0 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: 1309 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 632 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 228 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 10.6

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 18, 6:30 PM CDT, 1 hour 32 minutes earlier.

Area forecast discussion, Jul 18, 6:30 PM CDT, 1 hour 32 minutes before

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Hazardous weather outlook, Jul 18, 7:14 PM CDT, 48 minutes before

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In the hours before

Special weather statement, Jul 18, 6:58 PM CDT, 1 hour 4 minutes before

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Special weather statement, Jul 18, 7:09 PM CDT, 53 minutes before

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Special weather statement, Jul 18, 7:12 PM CDT, 50 minutes before

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Special weather statement, Jul 18, 7:29 PM CDT, 33 minutes before

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Special weather statement, Jul 18, 7:39 PM CDT, 23 minutes before

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Special weather statement, Jul 18, 7:46 PM CDT, 16 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 18, 7:09 PM CDT	Special Weather Statement	DLH	Lake	21 min
Jul 18, 7:11 PM CDT	Special Marine Warning	DLH		64 min
Jul 18, 7:12 PM CDT	Special Weather Statement	DLH	Cook	18 min
Jul 18, 7:29 PM CDT	Special Weather Statement	DLH	Cook	31 min
Jul 18, 7:39 PM CDT	Special Weather Statement	DLH	Itasca	21 min
Jul 18, 7:46 PM CDT	Special Weather Statement	DLH	Saint Louis	14 min
Jul 18, 7:54 PM CDT	Flash Flood Watch	DLH	Cook, Lake, Saint Louis	8 hr
Jul 18, 8:28 PM CDT	Severe Thunderstorm Warning	DLH	Lake, Saint Louis	32 min
Jul 18, 9:01 PM CDT	Special Weather Statement	DLH	Itasca	44 min
Jul 18, 9:03 PM CDT	Special Weather Statement	DLH	Lake	12 min
Jul 18, 9:23 PM CDT	Special Weather Statement	DLH	Lake	27 min
Jul 18, 9:32 PM CDT	Areal Flood Advisory	DLH	Cook, Lake	12 hr
Jul 18, 9:40 PM CDT	Special Weather Statement	DLH	Itasca	35 min
Jul 18, 9:46 PM CDT	Special Marine Warning	DLH		59 min
Jul 18, 10:12 PM CDT	Special Weather Statement	DLH	Saint Louis	18 min
Jul 18, 10:21 PM CDT	Special Weather Statement	DLH	Saint Louis	24 min
Jul 18, 10:44 PM CDT	Special Weather Statement	DLH	Saint Louis	31 min
Jul 18, 11:01 PM CDT	Severe Thunderstorm Warning	DLH	Itasca, Saint Louis	29 min
Jul 18, 11:22 PM CDT	Severe Thunderstorm Warning	DLH	Itasca, Saint Louis	38 min
Jul 18, 11:36 PM CDT	Severe Thunderstorm Warning	DLH	Lake, Saint Louis	24 min
Jul 18, 11:53 PM CDT	Severe Thunderstorm Warning	DLH	Lake, Saint Louis	22 min
Jul 19, 12:15 AM CDT	Special Weather Statement	DLH	Koochiching	60 min
Jul 19, 12:24 AM CDT	Areal Flood Advisory	DLH	Cook, Lake	12 hr
Jul 19, 1:26 AM CDT	Flash Flood Warning	DLH	Cook	8 hr
Jul 19, 1:07 AM CDT	Special Weather Statement	DLH	Ashland, Bayfield, Burnett, Douglas, Washburn	38 min
Jul 19, 1:42 AM CDT	Special Weather Statement	DLH	Iron, Price, Sawyer	48 min
Jul 19, 3:03 AM CDT	Special Weather Statement	DLH	Sawyer	42 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2013 Every 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.