Alert archive / Iowa / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 200, NWS Des Moines, IA

June 23, 1998Butler County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 23, 1998, 11:56 PM CDT for Butler County, Iowa. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 23, 1998, 11:56 PM CDT (04:56 UTC)
Expired
Jun 24, 1998, 12:30 AM CDT
In force
34 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Butler County, IA

The radar

The Des Moines radar (KDMX), 135 km from the middle of the area, began a volume at 04:55 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.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 4.9 hours before the alert went out and 226 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, Davenport, at 00:00Z on 1998-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 794 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, Davenport, at 00:00Z on 1998-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 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
794 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

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 23, 8:59 PM CDTSevere Thunderstorm WarningDMXSac46 min
Jun 23, 9:25 PM CDTSevere Thunderstorm WarningDMXCrawford30 min
Jun 23, 9:47 PM CDTTornado WarningDMXSac33 min
Jun 23, 9:52 PM CDTTornado WarningDMXCalhoun33 min
Jun 23, 10:08 PM CDTSevere Thunderstorm WarningDMXCalhoun, Carroll47 min
Jun 23, 10:17 PM CDTSevere Thunderstorm WarningDMXWebster33 min
Jun 23, 10:19 PM CDTFlash Flood WarningDMXPalo Alto3 hr
Jun 23, 10:38 PM CDTSevere Thunderstorm WarningDMXHumboldt32 min
Jun 23, 10:41 PM CDTFlash Flood WarningDMXKossuth4 hr
Jun 23, 10:41 PM CDTFlash Flood WarningDMXSac4 hr
Jun 23, 10:54 PM CDTFlash Flood WarningDMXPocahontas4 hr
Jun 23, 11:20 PM CDTFlash Flood WarningDMXCrawford4 hr
Jun 23, 11:31 PM CDTFlash Flood WarningDMXWinnebago4 hr
Jun 23, 11:34 PM CDTSevere Thunderstorm WarningDMXCerro Gordo, Franklin, Worth31 min
Jun 23, 11:53 PM CDTFlash Flood WarningDMXCalhoun4 hr
Jun 24, 12:34 AM CDTFlash Flood WarningDMXHamilton, Webster4 hr
Jun 24, 2:35 AM CDTFlash Flood WarningDMXSac4 hr
Jun 24, 2:50 AM CDTFlash Flood WarningDMXCrawford4 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 1998Every severe thunderstorm warning in 1998

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; radar from the NEXRAD Level II archive.