Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 25, NWS Duluth, MN

May 15, 1998Cass County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at May 15, 1998, 5:47 AM CDT for Cass County, Minnesota. It was in force for 48 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: May 15, 1998, 5:47 AM CDT (10:47 UTC)
Expired: May 15, 1998, 6:35 AM CDT
In force: 48 min
Issued by: NWS Duluth, MN
Area: Whole counties

County Cass County, MN

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 10.8 hours before the alert went out and 196 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: 897 J/kg
Mixed-layer CIN: -192 J/kg
Mixed-layer LCL: 1683 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 376 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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.

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 May 15, 2:30 AM CDT, 3 hours 17 minutes earlier.

Area forecast discussion, May 15, 2:30 AM CDT, 3 hours 17 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
May 15, 3:09 AM CDT	Severe Thunderstorm Warning	DLH	Koochiching	46 min
May 15, 4:16 AM CDT	Severe Thunderstorm Warning	DLH	Koochiching	49 min
May 15, 6:11 AM CDT	Severe Thunderstorm Warning	DLH	Itasca	44 min
May 15, 2:29 PM CDT	Severe Thunderstorm Warning	DLH	Crow Wing	46 min
May 15, 5:04 PM CDT	Severe Thunderstorm Warning	DLH	Pine	56 min
May 15, 5:04 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin	56 min
May 15, 5:10 PM CDT	Severe Thunderstorm Warning	DLH	Saint Louis	55 min
May 15, 5:23 PM CDT	Tornado Warning	DLH	Pine	62 min
May 15, 5:48 PM CDT	Tornado Warning	DLH	Pine	27 min
May 15, 6:06 PM CDT	Severe Thunderstorm Warning	DLH	Carlton	59 min
May 15, 6:06 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin	59 min
May 15, 6:17 PM CDT	Severe Thunderstorm Warning	DLH	Pine	48 min
May 15, 6:41 PM CDT	Tornado Warning	DLH	Carlton, Pine	34 min
May 15, 6:26 PM CDT	Severe Thunderstorm Warning	DLH	Burnett	44 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1998 Every severe thunderstorm warning in 1998

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.