Alert archive / Iowa / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 121, NWS Des Moines, IA

August 16, 1987Benton County, Linn County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 16, 1987, 5:01 PM CDT for Benton County, Linn County, Iowa. It was in force for 49 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 16, 1987, 5:01 PM CDT (22:01 UTC)
Expired
Aug 16, 1987, 5:50 PM CDT
In force
49 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Benton County, IA, Linn County, IA

The radar

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

What was reported inside it

TimeReportWhereRemark
Aug 16, 5:30 PM CDTThunderstorm Wind 56Linn, IA
Aug 16, 5:45 PM CDTThunderstorm Wind 61Linn, IA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Peoria Regional, IL (KPIA), launched 12:00Z, 10.0 hours before the alert went out and 243 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-pSkew-T log-p diagram, Peoria Regional, IL at 12:00Z on 1987-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1711 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peoria Regional, IL at 12:00Z on 1987-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1711 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
818 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
-15 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 1:05 AM CDTSevere Thunderstorm WarningDMXDickinson55 min
Aug 16, 3:22 PM CDTSevere Thunderstorm WarningDMXMarshall28 min
Aug 16, 3:49 PM CDTSevere Thunderstorm WarningDMXMarshall14 min
Aug 16, 3:49 PM CDTSevere Thunderstorm WarningDMXTama41 min
Aug 16, 4:26 PM CDTSevere Thunderstorm WarningDMXBenton39 min
Aug 16, 5:11 PM CDTSevere Thunderstorm WarningDMXPoweshiek42 min
Aug 16, 5:21 PM CDTSevere Thunderstorm WarningDMXWashington36 min
Aug 16, 5:21 PM CDTSevere Thunderstorm WarningDMXJefferson28 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1987Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.