Alert archive / Iowa / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 21, NWS Des Moines, IA

April 12, 1998Carroll County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 12, 1998, 8:53 PM CDT for Carroll County, Iowa. It was in force for 32 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
Apr 12, 1998, 8:53 PM CDT (01:53 UTC)
Expired
Apr 12, 1998, 9:25 PM CDT
In force
32 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Carroll County, IA

What was reported inside it

TimeReportWhereRemark
Apr 12, 9:10 PM CDTHail 0.75Glidden, IA
Apr 12, 9:15 PM CDTHail 1Glidden, 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, 1.9 hours before the alert went out and 148 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 1998-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 390 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 1998-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 210 square meters per square second.1939587897Sfc1 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
390 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
1826 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
210 m²/s²
0-3 km storm-relative helicity
324 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDSM 130153 RRA
SVRDSM
IAC027-130225-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
853 PM CDT SUN APR 12 1998

* SEVERE THUNDERSTORM WARNING FOR
  EASTERN CARROLL COUNTY - WEST CENTRAL IOWA

* UNTIL 925 PM CDT
 
* SOME AREAS AFFECTED
    GLIDDEN
    RALSTON
    CARROLL AIRPORT

* AT 852 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 50 MILES
  SOUTHWEST OF FORT DODGE OR NEAR ROSELLE MOVING EAST NORTHEAS0T AT 30
  MPH.

* THE STORM WILL BE NEAR RALSTON BY 920 PM.

LARGE HAIL IS LIKELY WITH THIS STORM.


STARK

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 12, 7:06 PM CDTSevere Thunderstorm WarningDMXEmmet34 min
Apr 12, 7:47 PM CDTSevere Thunderstorm WarningDMXCrawford33 min
Apr 12, 8:22 PM CDTSevere Thunderstorm WarningDMXCarroll, Crawford48 min

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.