Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 40, NWS Quad Cities, IA

July 27, 1997Cedar County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jul 27, 1997, 4:02 PM CDT for Cedar County, Iowa. It was in force for 58 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
Jul 27, 1997, 4:02 PM CDT (21:02 UTC)
Expired
Jul 27, 1997, 5:00 PM CDT
In force
58 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Cedar County, IA

The watch it was issued in

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

IssuedProductOfficeLasted
Jul 27, 4:00 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.0 hours before the alert went out and 55 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, Davenport, at 12:00Z on 1997-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2407 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, Davenport, at 12:00Z on 1997-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.1939Sfc1 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
2407 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
1367 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
41 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 KMLI 272103 RRA
TORMLI
IAC031-272200-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
402 PM CDT SUN JUL 27 1997

* TORNADO WARNING FOR
  CEDAR COUNTY IN EAST CENTRAL IOWA

* UNTIL 500 PM CDT
 
* SOME LOCATIONS AFFECTED
  TIPTON MATHEWS AIRPORT             AROUND 410 PM CDT
  WALD                               AROUND 410 PM CDT
  ROCHESTER                          AROUND 410 PM CDT
  TIPTON                             AROUND 410 PM CDT
  CLARENCE                           AROUND 410 PM CDT

* AT 401 PM CDT...A DEVELOPING TORNADO WAS INDICATED BY QUAD CITIES
  IA DOPPLER RADAR 18 MILES NORTHEAST OF IOWA CITY OR 5 MILES WEST
  OF WALD MOVING EAST AT 25 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.

IssuedProductOfficeCountiesLasted
Jul 27, 3:23 PM CDTSevere Thunderstorm WarningDVNIowa62 min
Jul 27, 3:36 PM CDTSevere Thunderstorm WarningDVNJohnson49 min
Jul 27, 3:43 PM CDTSevere Thunderstorm WarningDVNCedar62 min
Jul 27, 4:16 PM CDTTornado WarningDVNScott64 min
Jul 27, 4:22 PM CDTTornado WarningDVNClinton63 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.