Alert archive / Iowa / Tornado Warnings in 1990

Tornado Warning 12, NWS Des Moines, IA

June 13, 1990Cass County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 13, 1990, 6:44 PM CDT for Cass County, Iowa. It was in force for 18 min.

The area

The counties it named.

The facts

Issued: Jun 13, 1990, 6:44 PM CDT (23:44 UTC)
Expired: Jun 13, 1990, 7:02 PM CDT
In force: 18 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Cass County, IA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.7 hours before the alert went out and 120 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3655 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 336 m²/s²
0-3 km storm-relative helicity: 342 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.

000 
TTAA00 KDSM 132346
TORDSM
IAC029-140015-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
644 PM CDT WED JUN 13 1990
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  715 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTHWEST IOWA
          ...NORTHERN CASS
 
AT 640 PM CDT...A SHERIFF DEPUTY REPORTED A FUNNEL CLOUD NEAR THE TOWN
OF LEWIS ABOUT 10 MILES SOUTH OF ATLANTIC OR 45 MILES OF COUNCIL
BLUFFS. THE STORM WHICH PRODUCE THIS FUNNEL CLOUDS WAS MOVING EAST
NORTHEAST AT 30 MILES AN HOUR.
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
PEOPLE IN THE TOWNS OF ATLANTIC...WIOTA...AND LEWIS SHOULD BE ON THE
LOOKOUT.
 
JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 7:16 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	13 min
Jun 12, 7:16 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton	44 min
Jun 12, 7:26 PM CDT	Severe Thunderstorm Warning	DMX	Wright	44 min
Jun 12, 7:36 PM CDT	Severe Thunderstorm Warning	DMX	Mitchell	69 min
Jun 12, 8:10 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Cerro Gordo, Floyd, Franklin	35 min
Jun 12, 8:45 PM CDT	Severe Thunderstorm Warning	DMX	Chickasaw	60 min
Jun 12, 9:23 PM CDT	Tornado Warning	DMX	Floyd	37 min
Jun 12, 9:49 PM CDT	Severe Thunderstorm Warning	DMX	Winneshiek	56 min
Jun 12, 9:49 PM CDT	Severe Thunderstorm Warning	DMX	Fayette	41 min
Jun 12, 9:57 PM CDT	Severe Thunderstorm Warning	DMX	Dickinson	28 min
Jun 12, 10:03 PM CDT	Severe Thunderstorm Warning	DMX	Howard	57 min
Jun 12, 10:03 PM CDT	Severe Thunderstorm Warning	DMX	Chickasaw	27 min
Jun 12, 10:20 PM CDT	Severe Thunderstorm Warning	DMX	Allamakee	40 min
Jun 12, 10:47 PM CDT	Severe Thunderstorm Warning	DMX	Winneshiek	43 min
Jun 13, 2:28 AM CDT	Severe Thunderstorm Warning	DMX	Carroll, Greene, Guthrie	32 min

Nearby

Tornado Warnings in Iowa, 1990 Every tornado warning in 1990 Tornadoes in 1990

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.