Alert archive / Illinois / Tornado Warnings in 1997

Tornado Warning 35, NWS Quad Cities, IA

July 2, 1997Jo Daviess County, Illinois

NWS Quad Cities, IA issued this tornado warning at Jul 2, 1997, 12:41 AM CDT for Jo Daviess County, Illinois. It was in force for 59 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 2, 1997, 12:41 AM CDT (05:41 UTC)
Expired
Jul 2, 1997, 1:40 AM CDT
In force
59 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Jo Daviess County, IL

The radar

The Quad Cities radar (KDVN), 89 km from the middle of the area, began a volume at 05:43 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 00:00Z, 5.7 hours before the alert went out and 86 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 1997-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1089 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 00:00Z on 1997-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 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
1089 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
1458 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
236 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 020541 RRA
TORMLI
ILC085-020640-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1241 AM CDT WED JUL 2 1997

* TORNADO WARNING FOR
  JO DAVIESS COUNTY IN NORTHWESTERN ILLINOIS

* UNTIL 140 AM CDT
 
* SOME LOCATIONS AFFECTED
  WOODBINE                           AROUND 1240 AM CDT
  STOCKTON                           AROUND 100 AM CDT
  NORA                               AROUND 100 AM CDT

* AT 1238 AM CDT...A POSSIBLE TORNADO WAS INDICATED BY QUAD CITIES
  IA DOPPLER RADAR 22 MILES EAST OF DUBUQUE OR 5 MILES NORTHWEST OF
  WOODBINE MOVING EAST AT 25 MPH.

  THIS STORM HAS PRODUCED SOME DAMAGING WINDS AS IT SKIRTED
  ALONG HIGHWAY 20.  IF YOU LIVE IN THE PA
TH OF THIS DANGEROUS
  STORM...TAKE COVER AT THIS TIME.

  MEYER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 11:40 PM CDTTornado WarningDVNJo Daviess60 min
Jul 2, 1:20 AM CDTTornado WarningDVNStephenson60 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.