Alert archive / Illinois / Tornado Warnings in 1997

Tornado Warning 48, NWS Quad Cities, IA

August 16, 1997Rock Island County, Illinois

NWS Quad Cities, IA issued this tornado warning at Aug 16, 1997, 7:09 PM CDT for Rock Island County, Illinois. It was in force for 46 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 16, 1997, 7:09 PM CDT (00:09 UTC)
Expired
Aug 16, 1997, 7:55 PM CDT
In force
46 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Rock Island County, IL

The watch it was issued in

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

IssuedProductOfficeLasted
Aug 16, 5:15 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.2 hours before the alert went out and 18 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 00:00Z on 1997-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6428 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 1997-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 square meters per square second.193958Sfc1 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
6428 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
765 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
2.3
Supercell composite
10.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 170009 RRA
TORMLI
ILC161-170055-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
709 PM CDT SAT AUG 16 1997

* TORNADO WARNING FOR
  NORTHERN ROCK ISLAND COUNTY IN NORTHWESTERN ILLINOIS

* UNTIL 755 PM CDT
 
* SOME LOCATIONS AFFECTED
  HILLSDALE                          AROUND 730 PM CDT
  CORDOVA                            AROUND 715 PM CDT

* AT 707 PM CDT...A TORNADO WAS INDICATED BY QUAD CITIES IA DOPPLER
  RADAR AND SPOTTER REPORTS 11 MILES SOUTHWEST OF CLINTON OR 10
  MILES NORTHWEST OF HILLSDALE MOVING EAST AT 10 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/BLH

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 7:24 PM CDTTornado WarningDVNWhiteside46 min
Aug 16, 7:55 PM CDTTornado WarningDVNRock Island35 min
Aug 16, 8:10 PM CDTTornado WarningDVNWhiteside30 min
Aug 16, 8:23 PM CDTTornado WarningDVNHenry62 min
Aug 16, 9:11 PM CDTSevere Thunderstorm WarningDVNBureau, Putnam49 min
Aug 16, 9:25 PM CDTSevere Thunderstorm WarningDVNHenry65 min
Aug 17, 12:23 AM CDTFlash Flood WarningDVNBureau, Henry8 hr
Aug 17, 12:23 AM CDTFlash Flood WarningDVNMercer8 hr

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.