Alert archive / Iowa / Tornado Warnings in 1990

Tornado Warning 21, NWS Des Moines, IA

June 16, 1990Keokuk County, Wapello County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 16, 1990, 1:36 PM CDT for Keokuk County, Wapello County, Iowa. It was in force for 44 min. 1 report 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
Jun 16, 1990, 1:36 PM CDT (18:36 UTC)
Expired
Jun 16, 1990, 2:20 PM CDT
In force
44 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Keokuk County, IA, Wapello 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
Jun 16, 2:05 PM CDTThunderstorm Wind 70Wapello, 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

Omaha, NE (KOAX), launched 12:00Z, 6.6 hours before the alert went out and 341 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, Omaha, NE at 12:00Z on 1990-06-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Omaha, NE at 12:00Z on 1990-06-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 241 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3656 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
241 m²/s²
0-3 km storm-relative helicity
237 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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 16, 6:13 AM CDTSevere Thunderstorm WarningDMXDallas, Polk62 min
Jun 16, 6:17 AM CDTTornado WarningDMXPolk43 min
Jun 16, 6:41 AM CDTFlash Flood WarningDMXPolk3 hr
Jun 16, 7:12 AM CDTTornado WarningDMXJasper33 min
Jun 16, 7:22 AM CDTFlash Flood WarningDMXDallas4 hr
Jun 16, 9:16 AM CDTFlash Flood WarningDMXMarion, Warren3 hr
Jun 16, 9:48 AM CDTFlash Flood WarningDMXJohnson3 hr
Jun 16, 1:36 PM CDTFlash Flood WarningDMXUnion114 min
Jun 16, 1:36 PM CDTTornado WarningDMXMahaska54 min
Jun 16, 2:16 PM CDTSevere Thunderstorm WarningDMXDavis, Jefferson, Van Buren44 min
Jun 16, 4:51 PM CDTSevere Thunderstorm WarningDMXAdair39 min
Jun 16, 5:15 PM CDTSevere Thunderstorm WarningDMXMadison, Union30 min
Jun 16, 5:49 PM CDTSevere Thunderstorm WarningDMXWapello26 min
Jun 16, 5:49 PM CDTSevere Thunderstorm WarningDMXMadison26 min
Jun 16, 6:16 PM CDTSevere Thunderstorm WarningDMXClarke29 min

Nearby

Tornado Warnings in Iowa, 1990Every tornado warning in 1990Tornadoes in 1990

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.