Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 30, NWS Quad Cities, IA

June 21, 1997Dubuque County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jun 21, 1997, 1:52 AM CDT for Dubuque County, Iowa. It was in force for 63 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, 1:52 AM CDT (06:52 UTC)
Expired: Jun 21, 1997, 2:55 AM CDT
In force: 63 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Dubuque 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 20, 11:45 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 21, 1:30 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.9 hours before the alert went out and 100 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.

536 
WFUS1 KMLI 210655 RRA
TORMLI
IAC061-210755-

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

* TORNADO WARNING FOR
  DUBUQUE COUNTY IN NORTHEASTERN IOWA

* UNTIL 255 AM CDT
 
* SOME LOCATIONS AFFECTED
  FARLEY                             AROUND 210 AM CDT
  CASCADE                            AROUND 210 AM CDT
  EPWORTH                            AROUND 220 AM CDT

* AT 152 AM CDT...A POSSIBLE TORNADO WAS INDICATED BY QUAD CITIES
  IA DOPPLER RADAR 27 MILES WEST OF DUBUQUE OR 3 MILES WEST OF
  WORTHINGTON MOVING EAST AT 25 MPH.
 
IF YOU LIVE IN THE PATH OF THIS VERY DANGEROUS STORM...SEEK SHELTER
IMMEDIATELY ON THE LOWEST FLOOR AWAY FROM WINDOWS

THIS STORM HAS HAD A HISTORY OF PRODUCING WINDS UP TO 90 MPH.

IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE TO BE IS
IN A BASEMENT. GET UNDER A WORKBENCH OR PIECE OF STURDY
FURNITURE. IF NO BASEMENT IS AVAILABLE...FIND SHELTER IN AN
INTERIOR ROOM SUCH AS A CLOSET ON THE LOWEST FLOOR. USE
BLANKETS...PILLOWS...OR CUSHIONS TO COVER YOUR BODY. AVOID
WINDOWS.

TEH/PAB

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, 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, 4:53 AM CDT	Tornado Warning	DVN	Jones	47 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.