Alert archive / Illinois / Tornado Warnings in 1987

Tornado Warning 5, NWS Quad Cities, IA

August 8, 1987Muscatine County, Iowa; Mercer County, Rock Island County, Illinois

NWS Quad Cities, IA issued this tornado warning at Aug 8, 1987, 4:28 PM CDT for Muscatine County, Iowa; Mercer County, Rock Island County, Illinois. It was in force for 62 min.

The area

The counties it named.

The facts

Issued
Aug 8, 1987, 4:28 PM CDT (21:28 UTC)
Expired
Aug 8, 1987, 5:30 PM CDT
In force
62 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

Counties Muscatine County, IA, Mercer County, IL, Rock Island County, IL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Peoria Regional, IL (KPIA), launched 12:00Z, 9.5 hours before the alert went out and 129 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, Peoria Regional, IL at 12:00Z on 1987-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Peoria Regional, IL at 12:00Z on 1987-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
NaN m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 082128
TORMLI
IAC139-ILC161-131-082230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE MOLINE IL
428 PM CDT SAT AUG 8 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 530 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

EXTREME EAST IOWA...MUSCATINE
NORTHWEST ILLINOIS...ROCK-ISLAND AND MERCER

AT 420 PM CDT SEVERAL SIGHTINGS OF A FUNNEL CLOUD WERE REPORTED
JUST SOUTH OF MUSCATINE BY THE SHERRIFS DEPARTMENT. MUSCATINE IS
28 MILES WEST OF MOLINE. RADAR INDICATES A STRONG THUNDERSTORM
THIS POSITION.

IF YOU ARE IN THE PATH OF THIS TORNADO...TAKE COVER IMMEDIATELY.
A BASEMENT...INTERIOR HALLWAY...OR A ROOM ON THE LOWEST FLOOR IS
THE SAFEST PLACE.  TAKE COVER IN A STORM SHELTER OR LIE IN A
NEARBY DITCH OR DEPRESSION.

IF TIME PERMITS..ASK THE NEAREST LAW ENFORCEMENT DAGENCY TO RELAY
YOUR REPORT OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

AMBRIDGE

Nearby

Tornado Warnings in Illinois, 1987Tornado Warnings in Iowa, 1987Every tornado warning in 1987Tornadoes in 1987

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.