Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 31, NWS Quad Cities, IA

June 21, 1997Jones County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jun 21, 1997, 4:53 AM CDT for Jones County, Iowa. It was in force for 47 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, 4:53 AM CDT (09:53 UTC)
Expired: Jun 21, 1997, 5:40 AM CDT
In force: 47 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Jones County, IA

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 21, 1:30 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 9.9 hours before the alert went out and 76 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: 4926 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 216 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.

569 
WFUS1 KMLI 210955 RRA
TORMLI
IAC105-211040-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
453 AM CDT SAT JUN 21 1997

* TORNADO WARNING FOR
  JONES COUNTY IN EAST CENTRAL IOWA

* UNTIL 540 AM CDT
 
* SOME LOCATIONS AFFECTED
  SCOTCH GROVE                       AROUND 455 AM CDT
  CENTER JCT                         AROUND 455 AM CDT
  ONSLOW                             AROUND 500 AM CDT

* AT 447 AM CDT...A DEVELOPING TORNADO WAS INDICATED BY QUAD CITIES
  IA DOPPLER RADAR 23 MILES EAST OF CEDAR RAPIDS OR 5 MILES
  NORTHWEST OF OLIN MOVING EAST AT 30 MPH.

IF YOU LIVE IN THE PATH OF THESE SEVERE THUNDERSTORMS...SEEK
SHELTER IMMEDIATELY

THESE STORMS HAVE HAD A HISTORY OF PRODUCING WINDS UP TO 100 MPH.

TEH/TPH

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 11:32 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque	63 min
Jun 21, 12:51 AM CDT	Tornado Warning	DVN	Buchanan	64 min
Jun 21, 1:04 AM CDT	Severe Thunderstorm Warning	DVN	Benton	61 min
Jun 21, 1:20 AM CDT	Tornado Warning	DVN	Delaware, Linn	60 min
Jun 21, 1:46 AM CDT	Tornado Warning	DVN	Jones	64 min
Jun 21, 1:52 AM CDT	Tornado Warning	DVN	Dubuque	63 min
Jun 21, 2:05 AM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson	65 min
Jun 21, 2:20 AM CDT	Severe Thunderstorm Warning	DVN	Jackson	60 min
Jun 21, 3:58 AM CDT	Severe Thunderstorm Warning	DVN	Keokuk	62 min
Jun 21, 4:01 AM CDT	Severe Thunderstorm Warning	DVN	Washington	59 min
Jun 21, 4:10 AM CDT	Severe Thunderstorm Warning	DVN	Jefferson	65 min
Jun 21, 4:19 AM CDT	Severe Thunderstorm Warning	DVN	Henry, Louisa	61 min
Jun 21, 4:46 AM CDT	Severe Thunderstorm Warning	DVN	Muscatine	64 min
Jun 21, 4:55 AM CDT	Severe Thunderstorm Warning	DVN	Cedar	45 min
Jun 21, 4:56 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines	49 min
Jun 21, 5:07 AM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	58 min
Jun 21, 5:22 AM CDT	Severe Thunderstorm Warning	DVN	Jackson	48 min

Nearby

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