Alert archive / Iowa / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 181, NWS Sioux Falls, SD

August 17, 1986Monona County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 17, 1986, 12:30 AM CDT for Monona County, Iowa. It was in force for 60 min.

The area

The counties it named.

The facts

Issued: Aug 17, 1986, 12:30 AM CDT (05:30 UTC)
Expired: Aug 17, 1986, 1:30 AM CDT
In force: 60 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Monona County, IA

The radar

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

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.5 hours before the alert went out and 88 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3605 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 48 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, Aug 16, 11:20 PM CDT, 1 hour 10 minutes before

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Special weather statement, Aug 16, 11:29 PM CDT, 1 hour 1 minute before

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Special weather statement, Aug 16, 11:54 PM CDT, 36 minutes before

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Special weather statement, Aug 16, 11:56 PM CDT, 34 minutes before

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Local storm report, Aug 17, 12:08 AM CDT, 22 minutes before

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Special weather statement, Aug 17, 12:24 AM CDT, 6 minutes before

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The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 16, 9:10 PM CDT	Tornado Warning	FSD	Aurora, Brule	35 min
Aug 16, 9:16 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, McCook	59 min
Aug 16, 9:16 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	59 min
Aug 16, 9:16 PM CDT	Severe Thunderstorm Warning	FSD	Davison	59 min
Aug 16, 10:05 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Minnehaha	55 min
Aug 16, 10:05 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Turner	55 min
Aug 16, 10:17 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Douglas, Hutchinson	58 min
Aug 16, 10:17 PM CDT	Severe Thunderstorm Warning	FSD	Hanson	58 min
Aug 16, 10:37 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln, Turner	68 min
Aug 16, 10:37 PM CDT	Severe Thunderstorm Warning	FSD	Yankton	68 min
Aug 16, 11:06 PM CDT	Severe Thunderstorm Warning	FSD	Union	54 min
Aug 17, 12:10 AM CDT	Severe Thunderstorm Warning	FSD	Woodbury	65 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1986 Every 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; the sounding from the Mesonet's radiosonde archive.