Alert archive / Iowa / Tornado Warnings in 1987

Tornado Warning 3, NWS Quad Cities, IA

May 30, 1987Scott County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 30, 1987, 7:14 PM CDT for Scott County, Iowa. It was in force for 56 min.

The area

The counties it named.

The facts

Issued
May 30, 1987, 7:14 PM CDT (00:14 UTC)
Expired
May 30, 1987, 8:10 PM CDT
In force
56 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Scott County, IA

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 00:00Z, 0.2 hours before the alert went out and 137 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 00:00Z on 1987-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 615 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, Peoria Regional, IL at 00:00Z on 1987-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
615 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1109 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
23 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 310014
TORMLI
IAC163-310110-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE MOLINE IL
714 PM CDT SAT MAY 30 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 810 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

EXTREME EAST IOWA...WESTERN SCOTT

AT 7 PM A LAW ENFORCEMENT OFFICER REPORTRD A TORNADO JUST E OF
WALOTT IN WESTERN SCOT COUNTY IOWA. THIS STORM WAS MOVING NE AT 35
MPH AND WILL PASS THROUGH THE VICINITY OF MARYSVILLE IN WESTERN
SCOTT CO WITHIN THE NEXT HALF HOUR

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 S2AFEST 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 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.