Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 74, NWS Duluth, MN

October 8, 1997Itasca County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Oct 8, 1997, 11:06 PM CDT for Itasca County, Minnesota. It was in force for 59 min. 1 report 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
Oct 8, 1997, 11:06 PM CDT (04:06 UTC)
Expired
Oct 9, 1997, 12:05 AM CDT
In force
59 min
Issued by
NWS Duluth, MN
Area
Whole counties

County Itasca County, MN

What was reported inside it

TimeReportWhereRemark
Oct 8, 11:20 PM CDTThunderstorm Wind 50Squaw Lake, MN

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.

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 4.1 hours before the alert went out and 120 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, International Fa, MN at 00:00Z on 1997-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 37 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 00:00Z on 1997-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 191 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
37 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
942 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
191 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
Oct 8, 10:32 PM CDTSevere Thunderstorm WarningDLHCass, Crow Wing43 min
Oct 8, 11:22 PM CDTSevere Thunderstorm WarningDLHCrow Wing53 min
Oct 8, 11:52 PM CDTSevere Thunderstorm WarningDLHKoochiching63 min
Oct 9, 12:05 AM CDTSevere Thunderstorm WarningDLHItasca40 min
Oct 9, 12:18 AM CDTSevere Thunderstorm WarningDLHAitkin32 min
Oct 9, 12:30 AM CDTSevere Thunderstorm WarningDLHCarlton, Pine, Saint Louis60 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1997Every severe thunderstorm warning in 1997

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.