Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 9, NWS Duluth, MN

June 21, 1986Carlton County, Minnesota; Douglas County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at Jun 21, 1986, 5:15 PM CDT for Carlton County, Minnesota; Douglas County, Wisconsin. It was in force for 45 min. 4 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 21, 1986, 5:15 PM CDT (22:15 UTC)
Expired
Jun 21, 1986, 6:00 PM CDT
In force
45 min
Issued by
NWS Duluth, MN
Area
Whole counties

Counties Carlton County, MN, Douglas County, WI

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Jun 21, 5:22 PM CDTTornado F1Carlton, MN
Jun 21, 5:40 PM CDTTornado F1Carlton, MN
Jun 21, 5:55 PM CDTThunderstorm Wind 52Carlton, MN
Jun 21, 6:00 PM CDTThunderstorm Wind 74Douglas, WI

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 10.3 hours before the alert went out and 213 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 1986-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 318 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 1986-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
318 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
727 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
106 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.8

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 21, 4:29 PM CDTSevere Thunderstorm WarningDLHSaint Louis31 min
Jun 21, 4:35 PM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Crow Wing25 min
Jun 21, 4:45 PM CDTSevere Thunderstorm WarningDLHCarlton, Saint Louis45 min
Jun 21, 5:15 PM CDTSevere Thunderstorm WarningDLHAitkin, Saint Louis45 min
Jun 21, 5:35 PM CDTTornado WarningDLHCarlton, Saint Louis55 min
Jun 21, 5:50 PM CDTSevere Thunderstorm WarningDLHPine40 min
Jun 21, 6:35 PM CDTSevere Thunderstorm WarningDLHPine55 min
Jun 21, 6:00 PM CDTTornado WarningDLHDouglas60 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1986Severe Thunderstorm Warnings in Wisconsin, 1986Every severe thunderstorm warning in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.