Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 8, NWS Des Moines, IA

June 21, 1997Calhoun County, Webster County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 21, 1997, 4:27 PM CDT for Calhoun County, Webster County, Iowa. It was in force for 33 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 21, 1997, 4:27 PM CDT (21:27 UTC)
Expired
Jun 21, 1997, 5:00 PM CDT
In force
33 min
Issued by
NWS Des Moines, IA
Area
Whole counties

Counties Calhoun County, IA, Webster County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.5 hours before the alert went out and 202 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 1997-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 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 12:00Z on 1997-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -167 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
7 J/kg
Mixed-layer CIN
-517 J/kg
Mixed-layer LCL
1224 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
-167 m²/s²
0-3 km storm-relative helicity
-147 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

458 
WFUS1 KDSM 212126 RRA
TORDSM
IAC025-187-212200-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
427 PM CDT SAT JUN 21 1997

* TORNADO WARNING FOR
  NORTHEASTERN CALHOUN COUNTY - NORTHWESTERN IOWA
  NORTHWESTERN WEBSTER COUNTY - CENTRAL IOWA

* UNTIL 500 PM CDT
 
* SOME AREAS AFFECTED
    BARNUM
    FORT DODGE
    MOORLAND
    KNIERIM

* AT AT 425 PM CDT RADAR INDICATED A DEVELOPING TORNADO
  15 MILES WEST OF FORT DODGE...JUST SOUTH OF MANSON MOVING
  EAST AT 25 MPH.

* THE STORM WILL BE NEAR FORT DODGE AT 445 PM CDT.

IF YOU ARE NEAR THIS DANGEROUS STORM...TAKE COVER IMMEDIATELY IN THE
LOWEST FLOOR AND INNER MOST ROOM OF A BUILDING.

77
 

&

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 10:14 PM CDTSevere Thunderstorm WarningDMXWright31 min
Jun 20, 10:20 PM CDTSevere Thunderstorm WarningDMXWebster35 min
Jun 20, 10:30 PM CDTSevere Thunderstorm WarningDMXFranklin30 min
Jun 20, 11:01 PM CDTSevere Thunderstorm WarningDMXFranklin34 min
Jun 20, 11:33 PM CDTSevere Thunderstorm WarningDMXHardin32 min
Jun 20, 11:39 PM CDTSevere Thunderstorm WarningDMXButler, Grundy31 min
Jun 21, 12:04 AM CDTSevere Thunderstorm WarningDMXGrundy, Hardin31 min
Jun 21, 12:21 AM CDTSevere Thunderstorm WarningDMXBlack Hawk, Grundy44 min
Jun 21, 12:28 AM CDTTornado WarningDMXBlack Hawk32 min
Jun 21, 1:41 AM CDTSevere Thunderstorm WarningDMXAudubon, Cass34 min
Jun 21, 2:39 AM CDTSevere Thunderstorm WarningDMXClarke, Warren31 min
Jun 21, 2:51 AM CDTSevere Thunderstorm WarningDMXPolk, Warren34 min
Jun 21, 3:06 AM CDTSevere Thunderstorm WarningDMXLucas, Marion29 min
Jun 21, 3:21 AM CDTSevere Thunderstorm WarningDMXMahaska, Monroe34 min
Jun 21, 3:53 AM CDTSevere Thunderstorm WarningDMXWapello32 min

Nearby

Tornado Warnings in Iowa, 1997Every tornado warning in 1997Tornadoes in 1997

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.