Alert archive / Iowa / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 211, NWS Des Moines, IA

June 27, 1998Pocahontas County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 27, 1998, 8:54 PM CDT for Pocahontas County, Iowa. It was in force for 36 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 27, 1998, 8:54 PM CDT (01:54 UTC)
Expired
Jun 27, 1998, 9:30 PM CDT
In force
36 min
Issued by
NWS Des Moines, IA
Area
Whole counties

County Pocahontas County, IA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 27, 4:00 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.9 hours before the alert went out and 210 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 1998-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4815 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 1998-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 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
4815 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1274 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
2.3
Supercell composite
15.9

Open this sounding in Storm Lab

The text

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

192 
WUUS1 KDSM 280155 RRA
SVRDSM
IAC151-280230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
854 PM CDT SAT JUN 27 1998

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN POCAHONTAS COUNTY IN NORTHWESTERN IOWA

* UNTIL 930 PM CDT

* AT 853 PM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 32
  MILES EAST SOUTHEAST OF SPENCER OR IN THE VICINITY OF PLOVER
  MOVING EAST NORTHEAST AT 40 MPH.

* THIS STORM IS EXPECTED TO BE NEAR

     PLOVER       NOW
     HAVELOCK     NOW

GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS A TORNADO
WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO
PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

COGIL

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 7:27 PM CDTTornado WarningDMXWorth33 min
Jun 27, 7:38 PM CDTSevere Thunderstorm WarningDMXCerro Gordo47 min
Jun 27, 7:41 PM CDTTornado WarningDMXCerro Gordo34 min
Jun 27, 8:15 PM CDTTornado WarningDMXFranklin35 min
Jun 27, 8:18 PM CDTSevere Thunderstorm WarningDMXCerro Gordo32 min
Jun 27, 8:44 PM CDTFlash Flood WarningDMXCerro Gordo3 hr
Jun 27, 8:49 PM CDTTornado WarningDMXCerro Gordo21 min
Jun 27, 10:08 PM CDTTornado WarningDMXButler32 min
Jun 27, 10:33 PM CDTSevere Thunderstorm WarningDMXDallas, Guthrie62 min
Jun 27, 10:33 PM CDTSevere Thunderstorm WarningDMXBoone62 min
Jun 27, 10:38 PM CDTTornado WarningDMXBremer, Butler32 min
Jun 27, 10:45 PM CDTSevere Thunderstorm WarningDMXButler50 min
Jun 27, 10:57 PM CDTSevere Thunderstorm WarningDMXGrundy48 min
Jun 27, 11:01 PM CDTSevere Thunderstorm WarningDMXDallas, Polk, Story64 min
Jun 27, 11:10 PM CDTSevere Thunderstorm WarningDMXBremer50 min
Jun 27, 11:18 PM CDTSevere Thunderstorm WarningDMXPolk62 min
Jun 27, 11:18 PM CDTSevere Thunderstorm WarningDMXMarshall62 min
Jun 27, 11:21 PM CDTSevere Thunderstorm WarningDMXBlack Hawk64 min
Jun 27, 11:24 PM CDTSevere Thunderstorm WarningDMXAdams, Ringgold, Taylor, Union61 min
Jun 28, 12:01 AM CDTSevere Thunderstorm WarningDMXTama64 min
Jun 28, 12:05 AM CDTSevere Thunderstorm WarningDMXJasper65 min
Jun 28, 12:40 AM CDTSevere Thunderstorm WarningDMXPoweshiek65 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; the sounding from the Mesonet's radiosonde archive.