Alert archive / Illinois / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 68, NWS Lincoln, IL

August 10, 1986Sangamon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Aug 10, 1986, 1:39 AM CDT for Sangamon County, Illinois. It was in force for 66 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
Aug 10, 1986, 1:39 AM CDT (06:39 UTC)
Expired
Aug 10, 1986, 2:45 AM CDT
In force
66 min
Issued by
NWS Lincoln, IL
Area
Whole counties

County Sangamon 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
Aug 10, 1:44 AM CDTHail 0.75Sangamon, 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, 6.7 hours before the alert went out and 102 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 1986-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 36 joules per kilogram.LCLEL10008507005003002001001 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 1986-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 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
36 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1455 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
31 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 KSPI 100639
SVRSPI
ILC167-100745-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD IL
139 AM CDT SUN AUG 10 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 245 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

CENTRAL ILLINOIS...SANGAMON

AT 1 30 AM A SEVERE THUNDERSTORM WAS INDICATED BY RADAR 20 MILEST
SOUTHWEST OF SPRINGFIELD NEAR AUBUORN. THE STORM WAS MOVING EAST
NORTHEAST AT 25  MILES AN HOUR.

REMEMBER..A SEVERE THUNDERSTORM PRODUCES DAMAGING WINDS IN EXCESS
OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING AND HEAVY RAINS THAT CAN
QUICKLY FLOOD A LOW LYING AREA.

IF THREATENI|NG WEATHER APPROACHES...YOU SHOULD GO TO A SAFE PLACE.
ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT OF
SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.

 ATTN ISP DIST.. 9
 DETGEN

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.