Alert archive / Illinois / Tornado Warnings in 1997

Tornado Warning 46, NWS Quad Cities, IA

August 16, 1997Whiteside County, Illinois

NWS Quad Cities, IA issued this tornado warning at Aug 16, 1997, 5:58 PM CDT for Whiteside County, Illinois. It was in force for 62 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, 5:58 PM CDT (22:58 UTC)
Expired
Aug 16, 1997, 7:00 PM CDT
In force
62 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Whiteside 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 12:00Z, 11.0 hours before the alert went out and 51 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 1997-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3426 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 1997-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 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
3426 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
756 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
155 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 162259 RRA
TORMLI
ILC195-170000-

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

* TORNADO WARNING FOR
  WHITESIDE COUNTY IN NORTHWESTERN ILLINOIS

* UNTIL 700 PM CDT
 
* SOME LOCATIONS AFFECTED
  FENTON                             AROUND 600 PM CDT
  UNION GROVE                        AROUND 600 PM CDT
  DENROCK                            AROUND 605 PM CDT
  UNIONVILLE                         AROUND 605 PM CDT
  MORRISON                           AROUND 615 PM CDT

* AT 555 PM CDT...A DEVELOPING TORNADO WAS INDICATED BY QUAD CITIES
  IA DOPPLER RADAR 21 MILES WEST OF STERLING OR 4 MILES SOUTHWEST OF
  UNION GROVE MOVING EAST AT 15 MPH.
 
IF YOU ARE OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...GO TO A CULVERT...DITCH OR LOW SPOT
AND COVER YOUR HEAD WITH YOUR HANDS.

REA

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.