Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 99, NWS Duluth, MN

July 4, 2018Lake County, Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 4, 2018, 9:10 AM CDT for Lake County, Saint Louis County, Minnesota. It was in force for 50 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 4, 2018, 9:10 AM CDT (14:10 UTC)
Expired: Jul 4, 2018, 10:00 AM CDT
In force: 50 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lake County, MN, Saint Louis County, MN

The radar

The Duluth radar (KDLH), 83 km from the middle of the area, began a volume at 14:11 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 12:00Z, 2.2 hours before the alert went out and 327 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: 2175 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1013 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.1

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 4, 8:48 AM CDT, 22 minutes earlier.

Area forecast discussion, Jul 4, 8:48 AM CDT, 22 minutes before

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Hazardous weather outlook, Jul 4, 3:55 AM CDT, 5 hours 15 minutes before

Hazardous Weather Outlook
National Weather Service Duluth MN
355 AM CDT Wed Jul 4 2018

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-050900-
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-
355 AM CDT Wed Jul 4 2018

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

.DAY ONE...Today and Tonight

Strong to severe thunderstorms are possible across northeast
Minnesota and northwest Wisconsin today and this evening,
especially later in the day. Damaging winds, hail, heavy rain, and
lightning will be the main threats. There could be isolated
flooding in areas of central into northeast Minnesota, where a
Flood Watch is in effect through early this evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Thunderstorms are possible at various times from Saturday night
through Tuesday night.

.SPOTTER INFORMATION STATEMENT...

Skywarn Spotters may be needed today and this evening to report
hail, wind damage, and rainfall with potentially strong to severe
storms.

LSZ121-140>148-050900-
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-
355 AM CDT Wed Jul 4 2018

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

.DAY ONE...Today and Tonight

Thunderstorms are possible today, mainly this afternoon and
evening. Some storms could be strong to severe.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Thunderstorms are possible at various times from Saturday night
through Tuesday night.

DAP/Grochocinski

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, Jul 4, 8:13 AM CDT, 57 minutes before

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Special weather statement, Jul 4, 8:15 AM CDT, 55 minutes before

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Local storm report, Jul 4, 8:19 AM CDT, 51 minutes before

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Special weather statement, Jul 4, 8:53 AM CDT, 17 minutes before

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Special weather statement, Jul 4, 8:55 AM CDT, 15 minutes before

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Local storm report, Jul 4, 8:58 AM CDT, 12 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 4, 4:33 AM CDT	Special Weather Statement	DLH	Koochiching	12 min
Jul 4, 4:44 AM CDT	Special Weather Statement	DLH	Koochiching	16 min
Jul 4, 5:03 AM CDT	Special Weather Statement	DLH		12 min
Jul 4, 5:14 AM CDT	Special Weather Statement	DLH		16 min
Jul 4, 5:20 AM CDT	Special Weather Statement	DLH	Koochiching	25 min
Jul 4, 5:28 AM CDT	Special Weather Statement	DLH		17 min
Jul 4, 5:43 AM CDT	Special Weather Statement	DLH		17 min
Jul 4, 5:46 AM CDT	Special Weather Statement	DLH	Koochiching	14 min
Jul 4, 6:11 AM CDT	Special Weather Statement	DLH	Koochiching	19 min
Jul 4, 6:23 AM CDT	Special Weather Statement	DLH	Koochiching	37 min
Jul 4, 6:28 AM CDT	Special Weather Statement	DLH		17 min
Jul 4, 6:41 AM CDT	Special Weather Statement	DLH	Koochiching	34 min
Jul 4, 6:43 AM CDT	Special Weather Statement	DLH	Cass, Crow Wing	32 min
Jul 4, 6:55 AM CDT	Severe Thunderstorm Warning	DLH	Cass, Crow Wing	50 min
Jul 4, 6:57 AM CDT	Severe Thunderstorm Warning	DLH	Koochiching	48 min
Jul 4, 7:14 AM CDT	Special Weather Statement	DLH	Itasca, Koochiching	31 min
Jul 4, 7:30 AM CDT	Special Weather Statement	DLH	Aitkin	30 min
Jul 4, 7:43 AM CDT	Special Weather Statement	DLH	Koochiching	32 min
Jul 4, 7:45 AM CDT	Special Weather Statement	DLH	Itasca	15 min
Jul 4, 7:52 AM CDT	Special Weather Statement	DLH	Aitkin, Crow Wing	23 min
Jul 4, 7:56 AM CDT	Special Weather Statement	DLH	Itasca	34 min
Jul 4, 8:13 AM CDT	Special Weather Statement	DLH	Itasca, Saint Louis	32 min
Jul 4, 8:15 AM CDT	Special Weather Statement	DLH	Aitkin	30 min
Jul 4, 8:43 AM CDT	Severe Thunderstorm Warning	DLH	Saint Louis	32 min
Jul 4, 8:53 AM CDT	Special Weather Statement	DLH	Saint Louis	52 min
Jul 4, 8:55 AM CDT	Special Weather Statement	DLH	Carlton, Pine	50 min
Jul 4, 9:48 AM CDT	Special Weather Statement	DLH	Lake	42 min
Jul 4, 10:17 AM CDT	Special Weather Statement	DLH	Lake	28 min
Jul 4, 10:43 AM CDT	Special Weather Statement	DLH	Lake	32 min
Jul 4, 11:21 AM CDT	Special Weather Statement	DLH	Cook	24 min
Jul 4, 11:49 AM CDT	Special Marine Warning	DLH		44 min
Jul 4, 11:51 AM CDT	Severe Thunderstorm Warning	DLH	Ashland	24 min
Jul 4, 12:17 PM CDT	Special Weather Statement	DLH	Ashland, Iron	43 min
Jul 4, 12:50 PM CDT	Special Weather Statement	DLH	Iron, Price	25 min
Jul 4, 1:13 PM CDT	Special Weather Statement	DLH	Iron, Price	32 min
Jul 4, 1:42 PM CDT	Special Weather Statement	DLH	Price	33 min
Jul 4, 4:20 PM CDT	Special Weather Statement	DLH	Sawyer	25 min
Jul 4, 4:37 PM CDT	Severe Thunderstorm Warning	DLH	Sawyer	23 min
Jul 4, 4:59 PM CDT	Severe Thunderstorm Warning	DLH	Price, Sawyer	31 min
Jul 4, 5:31 PM CDT	Special Weather Statement	DLH	Price	29 min
Jul 4, 5:53 PM CDT	Special Weather Statement	DLH	Sawyer	37 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.