Alert archive / Iowa / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 80, NWS Des Moines, IA

July 6, 1987Johnson County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 6, 1987, 6:09 PM CDT for Johnson County, Iowa. It was in force for 41 min.

The area

The counties it named.

The facts

Issued: Jul 6, 1987, 6:09 PM CDT (23:09 UTC)
Expired: Jul 6, 1987, 6:50 PM CDT
In force: 41 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Johnson 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

Peoria Regional, IL (KPIA), launched 12:00Z, 11.2 hours before the alert went out and 200 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: NaN m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 86 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

Local storm report, Jul 6, 5:06 PM CDT, 1 hour 3 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
Jul 6, 2:31 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	59 min
Jul 6, 3:22 PM CDT	Severe Thunderstorm Warning	DMX	Benton, Linn	38 min
Jul 6, 3:25 PM CDT	Severe Thunderstorm Warning	DMX	Buchanan	50 min
Jul 6, 3:58 PM CDT	Severe Thunderstorm Warning	DMX	Linn	47 min
Jul 6, 4:30 PM CDT	Severe Thunderstorm Warning	DMX	Linn	45 min
Jul 6, 5:16 PM CDT	Severe Thunderstorm Warning	DMX	Johnson, Linn	44 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1987 Every severe thunderstorm warning in 1987

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.