Alert archive / Illinois / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 101, NWS St. Louis, MO

June 6, 1997Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jun 6, 1997, 8:50 PM CDT for Randolph County, Illinois. It was in force for 25 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
Jun 6, 1997, 8:50 PM CDT (01:50 UTC)
Expired
Jun 6, 1997, 9:15 PM CDT
In force
25 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Randolph County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.8 hours before the alert went out and 256 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, Lincoln, IL at 00:00Z on 1997-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 560 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, Lincoln, IL at 00:00Z on 1997-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.1939Sfc1 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
560 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
704 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
56 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 KSTL 070151 RRA
SVRSTL
ILC157-070215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
850 PM CDT FRI JUN 6 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  915 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST ILLINOIS
 
   ...EASTERN RANDOLPH COUNTY
 
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN RANDOLPH COUNTY HAS BEEN
EXTENDED UNTIL 915 PM CDT...
 
AT 845 PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE SEVERE
THUNDERSTORM IN EASTERN RANDOLPH HAS CONTINUED TO DEVELOP AS IT MOVES
SLOWLY TO THE SOUTHEAST. THERE IS A CONTINUED THREAT FOR SEVERE WEATHER
FROM THIS STORM.
 
THIS STORM HAS DEVELOPED FURTHER SOUTHEAST...CLOSER TO STEELVILLE.
THE COMMUNITY OF PERCY MAY ALSO BE IN THE PATH OF THE STORM.
 
THIS IS A DANGEROUS STORM! BE PREPARED FOR DAMAGING WINDS...HAIL
AND DEADLY LIGHTNING. STAY INSIDE AND AWAY FROM WINDfOWS.
 
FERRY/PEDIGO

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 6, 7:12 PM CDTSevere Thunderstorm WarningLSXWashington48 min
Jun 6, 8:15 PM CDTSevere Thunderstorm WarningLSXRandolph30 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1997Every severe thunderstorm warning 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.