Alert archive / Iowa / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 35, NWS Des Moines, IA

June 17, 1992Black Hawk County, Grundy County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 17, 1992, 4:00 AM CDT for Black Hawk County, Grundy County, Iowa. It was in force for 45 min.

The area

The counties it named.

The facts

Issued: Jun 17, 1992, 4:00 AM CDT (09:00 UTC)
Expired: Jun 17, 1992, 4:45 AM CDT
In force: 45 min
Issued by: NWS Des Moines, IA
Area: Whole counties

Counties Black Hawk County, IA, Grundy County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 9.0 hours before the alert went out and 281 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: 528 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.6

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, 1:42 AM CDT, 2 hours 18 minutes before

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Special weather statement, Jun 17, 1:49 AM CDT, 2 hours 11 minutes before

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Special weather statement, Jun 17, 2:35 AM CDT, 1 hour 25 minutes before

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Special weather statement, Jun 17, 2:37 AM CDT, 1 hour 23 minutes before

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Special weather statement, Jun 17, 3:37 AM CDT, 23 minutes before

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Special weather statement, Jun 17, 3:39 AM CDT, 21 minutes before

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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 16, 9:59 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	46 min
Jun 16, 10:03 PM CDT	Tornado Warning	DMX	Crawford	42 min
Jun 16, 10:41 PM CDT	Severe Thunderstorm Warning	DMX	Dickinson	49 min
Jun 17, 3:44 AM CDT	Severe Thunderstorm Warning	DMX	Tama	22 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1992 Every severe thunderstorm warning in 1992

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.