Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 60, NWS Quad Cities, IA

September 19, 1997Benton County, Iowa

NWS Quad Cities, IA issued this tornado warning at Sep 19, 1997, 10:25 AM CDT for Benton County, Iowa. It was in force for 65 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
Sep 19, 1997, 10:25 AM CDT (15:25 UTC)
Expired
Sep 19, 1997, 11:30 AM CDT
In force
65 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Benton County, IA

The radar

The Quad Cities radar (KDVN), 134 km from the middle of the area, began a volume at 15:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 3.4 hours before the alert went out and 139 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 1997-09-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1652 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 1997-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 366 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
1652 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
825 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
366 m²/s²
0-3 km storm-relative helicity
366 m²/s²
Significant tornado parameter
0.0
Supercell composite
18.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 191525 RRA
TORMLI
IAC011-191630-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1025 AM CDT FRI SEP 19 1997

* TORNADO WARNING FOR
  BENTON COUNTY - EAST CENTRAL IOWA

* UNTIL 1130 AM CDT
 
* SOME LOCATIONS AFFECTED BY THIS TORNADO
  LUZERNE                                    AROUND 1025 AM CDT
  BLAIRSTOWN                                 AROUND 1035 AM CDT
  VAN HORNE                                  AROUND 1035 AM CDT
  WATKINS                                    AROUND 1050 AM CDT
  NEWHALL                                    AROUND 1050 AM CDT

* AT 1023 AM CDT...DOPPLER RADAR INDICATED A DEVELOPING TORNADO 30
  MILES WEST OF CEDAR RAPIDS OR 6 MILES NORTHWEST OF LUZERNE MOVING
  EAST AT 30 MPH.  THE STORM IS OVER THE TOWN OF IRVING.

GO TO THE BASEMENT AND GET UNDER A WORKBENCH OR STURDY PIECE OF
FURNITURE. IF NO BASEMENT IS AVAILABLE...GO TO A SMALL INTERIOR
ROOM ON THE LOWEST FLOOR!

CORONA/HIRSCH

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 19, 10:50 AM CDTSevere Thunderstorm WarningDVNLinn60 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; radar from the NEXRAD Level II archive.