Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 76, NWS Duluth, MN

July 17, 2017Crow Wing County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 17, 2017, 6:09 PM CDT for Crow Wing County, Minnesota. It was in force for 39 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 17, 2017, 6:09 PM CDT (23:09 UTC)
Expired: Jul 17, 2017, 6:48 PM CDT
In force: 39 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Crow Wing County, MN

The radar

The Duluth radar (KDLH), 147 km from the middle of the area, began a volume at 23:13 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 17, 3:21 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.2 hours before the alert went out and 185 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: 1041 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 214 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 Jul 17, 3:35 PM CDT, 2 hours 34 minutes earlier.

Area forecast discussion, Jul 17, 3:35 PM CDT, 2 hours 34 minutes before

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Hazardous weather outlook, Jul 17, 3:43 PM CDT, 2 hours 26 minutes before

Hazardous Weather Outlook
National Weather Service Duluth MN
343 PM CDT Mon Jul 17 2017

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-181245-
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-
343 PM CDT Mon Jul 17 2017

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

.DAY ONE...This afternoon and Tonight

Strong to severe thunderstorms are expected to develop across
north-central Minnesota later this afternoon and track eastward
into northeast Minnesota towards this evening. The strongest
storms will be capable of producing large hail and damaging winds,
with a small chance of a tornado. A Severe Thunderstorm Watch has
been issued for all of north-central and northeast Minnesota, as
well as portions of northwest Wisconsin for this afternoon and
evening.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Another round of strong to severe thunderstorms are expected
Tuesday, mainly for east central Minnesota into northwest
Wisconsin.

Thunderstorms are possible from central Minnesota to northwest
Wisconsin Wednesday afternoon through Thursday morning.

Thunderstorms are possible across northeast Minnesota and
northwest Wisconsin Friday afternoon, and again Saturday
afternoon through Saturday night.

.SPOTTER INFORMATION STATEMENT...

Skywarn Spotters will be needed this afternoon into this evening
across much of north-central and northeast Minnesota and portions
of northwest Wisconsin. Please report hail of any size, damaging
winds, and heavy rainfall amounts.

LSZ121-140>148-181245-
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-
343 PM CDT Mon Jul 17 2017

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

.DAY ONE...This afternoon and Tonight

Strong to severe thunderstorms will be possible over the western
Lake Superior nearshore waters later this evening and overnight.
Some storms may cause damaging winds, large hail, cloud-to-water
lightning, and heavy downpours.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Thunderstorms will be possible during the day Tuesday.

Another chance of thunderstorms will be possible Saturday
afternoon through Sunday morning.

JTS

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 17, 5:31 PM CDT, 38 minutes before

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Local storm report, Jul 17, 5:43 PM CDT, 26 minutes before

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Special weather statement, Jul 17, 5:43 PM CDT, 26 minutes before

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Local storm report, Jul 17, 5:46 PM CDT, 23 minutes before

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Local storm report, Jul 17, 6:01 PM CDT, 8 minutes before

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Local storm report, Jul 17, 6:03 PM CDT, 6 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 17, 11:54 AM CDT	Special Weather Statement	DLH	Itasca	21 min
Jul 17, 12:10 PM CDT	Special Weather Statement	DLH	Itasca	20 min
Jul 17, 1:49 PM CDT	Special Weather Statement	DLH	Saint Louis	11 min
Jul 17, 2:08 PM CDT	Special Weather Statement	DLH	Lake	37 min
Jul 17, 2:47 PM CDT	Special Weather Statement	DLH	Cook	28 min
Jul 17, 4:31 PM CDT	Special Weather Statement	DLH	Wadena	29 min
Jul 17, 4:44 PM CDT	Severe Thunderstorm Warning	DLH	Cass	31 min
Jul 17, 4:56 PM CDT	Special Weather Statement	DLH	Aitkin	34 min
Jul 17, 5:05 PM CDT	Severe Thunderstorm Warning	DLH	Cass, Crow Wing	40 min
Jul 17, 5:31 PM CDT	Special Weather Statement	DLH	Crow Wing	29 min
Jul 17, 5:34 PM CDT	Severe Thunderstorm Warning	DLH	Crow Wing	41 min
Jul 17, 5:43 PM CDT	Special Weather Statement	DLH	Aitkin	17 min
Jul 17, 5:56 PM CDT	Severe Thunderstorm Warning	DLH	Itasca	49 min
Jul 17, 5:58 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Cass, Crow Wing	47 min
Jul 17, 6:01 PM CDT	Severe Thunderstorm Warning	DLH	Cass, Itasca	44 min
Jul 17, 6:10 PM CDT	Special Weather Statement	DLH	Itasca	20 min
Jul 17, 6:34 PM CDT	Special Weather Statement	DLH	Carlton	86 min
Jul 17, 6:38 PM CDT	Special Weather Statement	DLH	Saint Louis	37 min
Jul 17, 6:42 PM CDT	Special Weather Statement	DLH	Saint Louis	33 min
Jul 17, 6:43 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Carlton, Pine, Saint Louis	62 min
Jul 17, 6:46 PM CDT	Special Weather Statement	DLH	Itasca	29 min
Jul 17, 6:53 PM CDT	Severe Thunderstorm Warning	DLH	Saint Louis	37 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2017 Every severe thunderstorm warning in 2017

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.