Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 23, NWS Duluth, MN

May 29, 2018Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at May 29, 2018, 6:50 PM CDT for Saint Louis County, Minnesota. It was in force for 40 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: May 29, 2018, 6:50 PM CDT (23:50 UTC)
Expired: May 29, 2018, 7:30 PM CDT
In force: 40 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 0.75 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 23:53 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, 11.8 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1592 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 201 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 May 29, 6:42 PM CDT, 8 minutes earlier.

Area forecast discussion, May 29, 6:42 PM CDT, 8 minutes before

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Hazardous weather outlook, May 29, 2:19 PM CDT, 4 hours 31 minutes before

Hazardous Weather Outlook
National Weather Service Duluth MN
219 PM CDT Tue May 29 2018

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-301030-
Koochiching-North St. Louis-Northern Cook/Northern Lake-
North Itasca-Central St. Louis-Southern Lake/North Shore-
Southern Cook/North Shore-North Cass-South Itasca-South Cass-
Crow Wing-Northern Aitkin-South Aitkin-Carlton/South St. Louis-
Pine-Douglas-Bayfield-Ashland-Iron-Burnett-Washburn-Sawyer-Price-
219 PM CDT Tue May 29 2018

This Hazardous Weather Outlook is for portions of northeast
Minnesota and northwest Wisconsin.

.DAY ONE...This afternoon and Tonight

Thunderstorms will develop across the Northland this afternoon
into this evening. Storms will develop first over central and
north central Minnesota and spread east overnight. Some of the
storms may be severe, with damaging wind and large hail the main
threats. Heavy rain will also be possible as storms track over
the same area. The severe threat will be greatest over far
northwest Wisconsin into much of northern Minnesota and continue
into late evening.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

There is a chance of thunderstorms Wednesday through Thursday.

.SPOTTER INFORMATION STATEMENT...

Skywarn Spotters may be needed this afternoon into this evening.

LSZ121-140>148-301030-
Bayfield to Oak Point WI-Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-Two Harbors to Duluth MN-
Duluth MN to Port Wing WI-Port Wing to Sand Island WI-
Sand Island to Bayfield WI-Oak Point to Saxon Harbor WI-
219 PM CDT Tue May 29 2018

This Hazardous Weather Outlook is for portions of the Nearshore
waters of western Lake Superior.

.DAY ONE...This afternoon and Tonight

Thunderstorms are possible over western Lake Superior this
evening and overnight. An isolated severe storm is possible.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Periods of thunderstorms are possible Wednesday through Thursday.

Strong east to northeast flow will likely develop Friday and
Saturday morning. The winds and resulting waves could cause
hazardous conditions for small craft.

Melde/JTS

More information may be obtained at the following web address:
http://www.weather.gov/duluth (all lower case)

In the hours before

Local storm report, May 29, 6:29 PM CDT, 21 minutes before

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Local storm report, May 29, 6:30 PM CDT, 20 minutes before

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Local storm report, May 29, 6:31 PM CDT, 19 minutes before

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Special weather statement, May 29, 6:32 PM CDT, 18 minutes before

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Local storm report, May 29, 6:43 PM CDT, 7 minutes before

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Local storm report, May 29, 6:50 PM CDT, 0 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
May 28, 7:04 PM CDT	Special Weather Statement	DLH	Pine	26 min
May 28, 7:28 PM CDT	Special Weather Statement	DLH	Pine	32 min
May 28, 7:40 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Crow Wing	24 min
May 28, 8:07 PM CDT	Special Weather Statement	DLH	Pine	8 min
May 29, 3:30 PM CDT	Severe Thunderstorm Warning	DLH	Cass	45 min
May 29, 3:34 PM CDT	Severe Thunderstorm Warning	DLH	Cass	26 min
May 29, 4:00 PM CDT	Severe Thunderstorm Warning	DLH	Cass, Itasca	45 min
May 29, 4:06 PM CDT	Severe Thunderstorm Warning	DLH	Pine	39 min
May 29, 4:15 PM CDT	Special Weather Statement	DLH	Cass, Crow Wing	15 min
May 29, 4:23 PM CDT	Severe Thunderstorm Warning	DLH	Cass	37 min
May 29, 4:36 PM CDT	Severe Thunderstorm Warning	DLH	Carlton, Pine	27 min
May 29, 4:40 PM CDT	Special Weather Statement	DLH	Crow Wing	20 min
May 29, 4:44 PM CDT	Severe Thunderstorm Warning	DLH	Pine	31 min
May 29, 4:53 PM CDT	Severe Thunderstorm Warning	DLH	Cass, Itasca	37 min
May 29, 5:01 PM CDT	Special Weather Statement	DLH	Aitkin	14 min
May 29, 5:23 PM CDT	Special Weather Statement	DLH	Carlton	37 min
May 29, 5:27 PM CDT	Special Weather Statement	DLH	Aitkin	18 min
May 29, 5:41 PM CDT	Special Weather Statement	DLH	Itasca	19 min
May 29, 5:49 PM CDT	Special Weather Statement	DLH	Aitkin	11 min
May 29, 5:59 PM CDT	Special Marine Warning	DLH		31 min
May 29, 6:03 PM CDT	Special Weather Statement	DLH	Itasca	12 min
May 29, 6:15 PM CDT	Special Weather Statement	DLH	Itasca	15 min
May 29, 6:24 PM CDT	Severe Thunderstorm Warning	DLH	Itasca, Saint Louis	36 min
May 29, 6:31 PM CDT	Special Marine Warning	DLH		59 min
May 29, 6:32 PM CDT	Special Weather Statement	DLH	Lake	28 min
May 29, 6:40 PM CDT	Severe Thunderstorm Warning	DLH	Lake, Saint Louis	50 min
May 28, 7:10 PM CDT	Severe Thunderstorm Warning	DLH	Burnett	35 min
May 28, 7:43 PM CDT	Special Weather Statement	DLH	Burnett	32 min
May 28, 7:58 PM CDT	Special Weather Statement	DLH	Burnett	32 min
May 28, 8:28 PM CDT	Special Weather Statement	DLH	Washburn	32 min
May 28, 9:07 PM CDT	Special Weather Statement	DLH	Sawyer	23 min
May 28, 9:46 PM CDT	Special Weather Statement	DLH	Sawyer	29 min
May 28, 11:01 PM CDT	Special Weather Statement	DLH	Price	29 min
May 29, 5:16 PM CDT	Special Weather Statement	DLH	Burnett	29 min
May 29, 5:42 PM CDT	Special Weather Statement	DLH	Douglas	33 min
May 29, 5:57 PM CDT	Special Weather Statement	DLH	Douglas	33 min
May 29, 6:23 PM CDT	Special Weather Statement	DLH	Washburn	52 min
May 29, 6:52 PM CDT	Special Weather Statement	DLH	Washburn	23 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2018 Every severe thunderstorm warning in 2018

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.