Alert archive / Illinois / Tornado Warnings in 1997

Tornado Warning 59, NWS Quad Cities, IA

August 24, 1997Hancock County, Illinois

NWS Quad Cities, IA issued this tornado warning at Aug 24, 1997, 6:12 PM CDT for Hancock County, Illinois. It was in force for 33 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
Aug 24, 1997, 6:12 PM CDT (23:12 UTC)
Expired
Aug 24, 1997, 6:45 PM CDT
In force
33 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Hancock County, IL

The radar

The Quad Cities radar (KDVN), 143 km from the middle of the area, began a volume at 23:13 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 watch it was issued in

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

IssuedProductOfficeLasted
Aug 24, 2:00 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.2 hours before the alert went out and 146 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 1997-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1037 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 1997-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 462 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
1037 J/kg
Mixed-layer CIN
-190 J/kg
Mixed-layer LCL
843 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
462 m²/s²
0-3 km storm-relative helicity
539 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 242314
TORMLI
ILC067-242345-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING...CORRECTED
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
612 PM CDT SUN AUG 24 1997

* TORNADO WARNING FOR
  SOUTHERN HANCOCK COUNTY - WEST CENTRAL ILLINOIS

* UNTIL 645 PM CDT
 
* SOME LOCATIONS AFFECTED
  CARTHAGE
  BASCO
  DENVER
  BENTLEY

* AT 611 PM CDT RADAR INDICATED A TORNADO NEAR CARTHAGE OR 20 MILES
  WEST OF MACOMB MOVING SOUTH NEAR 30 MILES AN HOUR.

* THE STORM WILL BE NEAR CARTHAGE AROUND 620 PM...NEAR BENTLEY AND
  BASCO AROUND 627 PM.

* LARGE HAIL IS ALSO LIKELY WITH THIS STORM.

IF YOU ARE NEAR THIS DANGEROUS STORM, TAKE COVER IMMEDIATELY IN THE
LOWEST FLOOR AND INNERMOST ROOM OF A BUILDING.X
 
DO NOT USE YOUR CAR TO OUTRUN A TORNADO. LEAVE THE CAR AND GO TO
A STRONG BUILDING. IF NO STRUCTURE IS NEARBY...GO TO A DITCH OR
LOW SPOT.

THIS IS AN EXTENSION TO THE PREVIOUS TORNADO WARNING FOR HANCOCK
COUNTY.

HELGESON

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 24, 4:39 PM CDTSevere Thunderstorm WarningDVNHenderson, Warren46 min
Aug 24, 5:43 PM CDTTornado WarningDVNHancock32 min

Nearby

Tornado Warnings in Illinois, 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.