Alert archive / Iowa / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 61, NWS Des Moines, IA

June 20, 1996Crawford County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 20, 1996, 1:00 AM CDT for Crawford County, Iowa. It was in force for 25 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 20, 1996, 1:00 AM CDT (06:00 UTC)
Expired
Jun 20, 1996, 1:25 AM CDT
In force
25 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Crawford County, IA

The radar

The Omaha radar (KOAX), 114 km from the middle of the area, began a volume at 05:59 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Jun 20, 1:18 AM CDTHail 1.75Denison, 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.0 hours before the alert went out and 114 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 00:00Z on 1996-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3601 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, Omaha, NE at 00:00Z on 1996-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.193958Sfc1 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
3601 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
1562 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
276 m²/s²
Significant tornado parameter
1.4
Supercell composite
19.9

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 19, 11:44 PM CDTSevere Thunderstorm WarningDMXSac31 min
Jun 20, 12:39 AM CDTSevere Thunderstorm WarningDMXSac21 min
Jun 20, 1:16 AM CDTFlash Flood WarningDMXSac3 hr
Jun 20, 1:23 AM CDTSevere Thunderstorm WarningDMXCrawford32 min
Jun 20, 9:25 AM CDTSevere Thunderstorm WarningDMXAudubon, Cass30 min
Jun 20, 9:49 AM CDTSevere Thunderstorm WarningDMXAdair, Guthrie41 min
Jun 20, 10:16 AM CDTSevere Thunderstorm WarningDMXDallas, Madison44 min
Jun 20, 10:36 AM CDTSevere Thunderstorm WarningDMXPolk, Warren39 min
Jun 20, 10:51 AM CDTSevere Thunderstorm WarningDMXMadison, Union29 min
Jun 20, 1:18 PM CDTFlash Flood WarningDMXAudubon3 hr
Jun 20, 4:23 PM CDTSevere Thunderstorm WarningDMXCrawford37 min
Jun 20, 5:11 PM CDTSevere Thunderstorm WarningDMXCrawford34 min
Jun 20, 5:32 PM CDTSevere Thunderstorm WarningDMXCrawford43 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1996Every severe thunderstorm warning in 1996

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; radar from the NEXRAD Level II archive.