Alert archive / Minnesota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 41, NWS Grand Forks, ND

June 18, 1991Clearwater County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 18, 1991, 12:07 AM CDT for Clearwater County, Minnesota. It was in force for 68 min.

The area

The counties it named.

The facts

Issued: Jun 18, 1991, 12:07 AM CDT (05:07 UTC)
Expired: Jun 18, 1991, 1:15 AM CDT
In force: 68 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Clearwater County, MN

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 5.1 hours before the alert went out and 190 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: 793 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 1857 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

In the hours before

Special weather statement, Jun 17, 10:47 PM CDT, 1 hour 20 minutes before

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The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 10:03 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Koochiching, Lake of the Woods	57 min
Jun 17, 10:46 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Koochiching, Lake of the Woods	44 min
Jun 17, 11:00 PM CDT	Severe Thunderstorm Warning	FGF	Mahnomen, Norman, Polk	45 min
Jun 18, 12:49 AM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater	56 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1991 Every severe thunderstorm warning in 1991

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.