Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 88, NWS Duluth, MN

June 30, 20184 counties in Minnesota; Douglas County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at Jun 30, 2018, 3:00 AM CDT for 4 counties in Minnesota; Douglas County, Wisconsin. It was in force for 45 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: Jun 30, 2018, 3:00 AM CDT (08:00 UTC)
Expired: Jun 30, 2018, 3:45 AM CDT
In force: 45 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Aitkin County, MN, Carlton County, MN, Pine County, MN, Saint Louis County, MN, Douglas County, WI

The radar

The Duluth radar (KDLH), 37 km from the middle of the area, began a volume at 08:01 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
Jun 29, 11:56 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 8.0 hours before the alert went out and 216 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: 3333 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 1867 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 233 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 Jun 30, 12:07 AM CDT, 2 hours 53 minutes earlier.

Area forecast discussion, Jun 30, 12:07 AM CDT, 2 hours 53 minutes before

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Hazardous weather outlook, Jun 29, 8:17 PM CDT, 6 hours 43 minutes before

Hazardous Weather Outlook
National Weather Service Duluth MN
817 PM CDT Fri Jun 29 2018

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-010130-
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-
817 PM CDT Fri Jun 29 2018

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

.DAY ONE...Tonight

Another round of strong to severe thunderstorms is possible
tonight as an area of low pressure moves through northern
Minnesota and into northwest Ontario. Large hail, damaging winds,
and torrential rain are possible. A tornado may be possible
overnight as well.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a chance for thunderstorms Sunday. Some storms could be
strong to severe and heavy rainfall may also cause flooding.
Thunderstorms are possible again Tuesday through Thursday with
Thursday being the most likely day to see stronger storms.

.SPOTTER INFORMATION STATEMENT...

Skywarn Spotters may be needed tonight.

LSZ121-140>148-010130-
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-
817 PM CDT Fri Jun 29 2018

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

.DAY ONE...Tonight

There is a chance of thunderstorms across western Lake Superior
overnight. Some storms could be strong to severe.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Thunderstorms are possible Tuesday through Thursday with Thursday
being the most likely day to see stronger storms.

DAP

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

In the hours before

Special weather statement, Jun 30, 2:09 AM CDT, 51 minutes before

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Local storm report, Jun 30, 2:18 AM CDT, 42 minutes before

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Local storm report, Jun 30, 2:21 AM CDT, 39 minutes before

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Special weather statement, Jun 30, 2:38 AM CDT, 22 minutes before

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Special weather statement, Jun 30, 2:39 AM CDT, 21 minutes before

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Special weather statement, Jun 30, 2:41 AM CDT, 19 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
Jun 29, 8:36 PM CDT	Special Weather Statement	DLH	Carlton	9 min
Jun 29, 8:58 PM CDT	Special Weather Statement	DLH	Carlton	32 min
Jun 30, 12:08 AM CDT	Special Weather Statement	DLH	Crow Wing	37 min
Jun 30, 12:35 AM CDT	Special Weather Statement	DLH	Crow Wing	25 min
Jun 30, 12:41 AM CDT	Special Weather Statement	DLH	Cook	34 min
Jun 30, 12:46 AM CDT	Special Weather Statement	DLH	Crow Wing	29 min
Jun 30, 1:16 AM CDT	Special Weather Statement	DLH	Crow Wing	29 min
Jun 30, 1:18 AM CDT	Special Weather Statement	DLH	Cass	27 min
Jun 30, 1:41 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Crow Wing	49 min
Jun 30, 2:09 AM CDT	Special Weather Statement	DLH	Cass	51 min
Jun 30, 2:28 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Carlton, Pine, Saint Louis	32 min
Jun 30, 2:38 AM CDT	Special Weather Statement	DLH	Koochiching	37 min
Jun 30, 2:39 AM CDT	Special Weather Statement	DLH		51 min
Jun 30, 2:41 AM CDT	Special Weather Statement	DLH		49 min
Jun 30, 3:02 AM CDT	Special Weather Statement	DLH	Itasca	13 min
Jun 30, 3:05 AM CDT	Special Weather Statement	DLH	Pine	25 min
Jun 30, 3:08 AM CDT	Special Marine Warning	DLH		67 min
Jun 30, 3:11 AM CDT	Special Weather Statement	DLH	Koochiching	34 min
Jun 30, 3:14 AM CDT	Special Weather Statement	DLH		31 min
Jun 30, 3:17 AM CDT	Special Weather Statement	DLH	Itasca	28 min
Jun 30, 3:19 AM CDT	Special Weather Statement	DLH	Saint Louis	26 min
Jun 30, 3:31 AM CDT	Special Weather Statement	DLH	Koochiching	44 min
Jun 30, 3:36 AM CDT	Special Weather Statement	DLH	Pine	24 min
Jun 30, 3:47 AM CDT	Special Weather Statement	DLH		28 min
Jun 30, 4:52 AM CDT	Special Weather Statement	DLH	Cook	23 min
Jun 30, 3:22 PM CDT	Special Weather Statement	DLH	Koochiching	8 min
Jun 30, 3:29 PM CDT	Special Weather Statement	DLH	Koochiching	16 min
Jun 30, 3:31 PM CDT	Special Weather Statement	DLH	Koochiching	14 min
Jun 30, 3:44 PM CDT	Special Weather Statement	DLH	Koochiching	16 min
Jun 30, 3:54 PM CDT	Special Weather Statement	DLH	Koochiching	21 min
Jun 30, 3:06 AM CDT	Heat Advisory	DLH	Ashland, Bayfield, Iron, Price, Sawyer, Washburn	16 hr
Jun 30, 3:12 AM CDT	Special Weather Statement	DLH	Sawyer	33 min
Jun 30, 3:49 AM CDT	Special Weather Statement	DLH	Douglas	26 min
Jun 30, 3:52 AM CDT	Special Weather Statement	DLH	Sawyer	23 min
Jun 30, 4:43 AM CDT	Special Weather Statement	DLH	Ashland, Bayfield, Iron	17 min
Jun 30, 5:15 AM CDT	Special Weather Statement	DLH	Iron	30 min
Jun 30, 5:12 PM CDT	Special Weather Statement	DLH	Price	33 min
Jun 30, 5:38 PM CDT	Special Weather Statement	DLH	Price	22 min
Jun 30, 6:00 PM CDT	Special Weather Statement	DLH	Price	15 min
Jun 30, 6:26 PM CDT	Special Weather Statement	DLH	Price	34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2018 Severe Thunderstorm Warnings in Wisconsin, 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.