Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 52, NWS Lincoln, IL

July 29, 1986Hancock County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 29, 1986, 1:01 AM CDT for Hancock County, Illinois. It was in force for 59 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 29, 1986, 1:01 AM CDT (06:01 UTC)
Expired
Jul 29, 1986, 2:00 AM CDT
In force
59 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Hancock County, IL

The radar

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

What was reported inside it

TimeReportWhereRemark
Jul 29, 1:30 AM CDTThunderstorm Wind 60Hancock, IL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Peoria Regional, IL (KPIA), launched 00:00Z, 6.0 hours before the alert went out and 136 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 1986-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2172 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 1986-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.1939587897Sfc1 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
2172 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1200 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPIA 290601
SVRPIA
ILC067-290700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEORIA IL
101 AM CDT TUE JUL 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 200 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

WEST CENTRAL ILLINOIS...HANCOCK

AT 1250 AM CDT..RADAR INDICATED A SEVERE THUNDERSTORM IN
SOUTHEAST IOWA ABOUT 10 MILES NORTHWEST OF KEOKUK.
.
THE SEVERE STORM WAS MOVING SOUTHEAST AT 45 MPH.
.
TOWNS IN THE WEST CENTRAL ILLINOIS IN THE PATH OF THIS
SEVERE STORM ARE CARTHAGE..WARSAW..PLYMOUTH AND AUGUSTA.

 THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH
 LITTLE OR NO ADVANCE WARNING...SO BE ON THE LOOKOUT AND BE
 PREPARED TO MOVE TO A PLACE OF SAFETY IF A TORNADO IS SPOTTED.

ATTN ISP DIST 14

PALMER

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 29, 1:36 AM CDTSevere Thunderstorm WarningILXMcDonough, Schuyler27 min
Jul 29, 3:13 AM CDTSevere Thunderstorm WarningILXMorgan, Sangamon62 min
Jul 29, 3:53 AM CDTSevere Thunderstorm WarningILXChristian, Montgomery67 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1986Every severe thunderstorm warning in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.