Alert archive / Illinois / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 171, NWS St. Louis, MO

May 23, 1998Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 23, 1998, 8:01 PM CDT for Marion County, Illinois. It was in force for 49 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
May 23, 1998, 8:01 PM CDT (01:01 UTC)
Expired
May 23, 1998, 8:50 PM CDT
In force
49 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Marion County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.0 hours before the alert went out and 169 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 1998-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 213 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 1998-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 126 square meters per square second.1939587897117Sfc1 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
213 J/kg
Mixed-layer CIN
-286 J/kg
Mixed-layer LCL
533 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
126 m²/s²
0-3 km storm-relative helicity
214 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

443 
WUUS1 KSTL 240102 RRA
SVRSTL
ILC121-240150-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
801 PM CDT SAT MAY 23 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MARION COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS

* UNTIL 850 PM CDT

* AT 802 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NORTHERN JEFFERSON COUNTY NEAR BOYD... MOVING
  NORTHEAST AT 30 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  HELM
  SALEM
  KELL
  CARTTER

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 60
MPH...DAMAGING HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. MOVE
TO AN INTERIOR ROOM ON THE LOWEST FLOOR OR YOUR HOME OR BUSINESS.
HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE
WATER COVERS THE ROAD.

FG/RP

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, May 23, 7:34 PM CDT, 27 minutes before
ILZ064-065-069-070-074-079-100>102-MOZ047>049-059>065-072>075-084-
085-099-240230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
734 PM CDT SAT MAY 23 1998

...SEVERE THUNDERSTORM WATCH 401 HAS BEEN CANCELLED FOR ALL MISSOURI
COUNTIES AND RANDOLPH..MONROE..ST. CLAIR..AND MADISON COUNTIES IN
ILLINOIS. IT REMAINS IN EFFECT FOR BOND..FAYETTE..MARION..CLINTON..AND
WASHINGTON COUNTIES IN SOUTHWEST ILLLINOIS UNTIL 900 PM CDT.

THE SEVERE THUNDERSTORM WATCH CANCELLATION MEANS THERE IS NO WATCH IN
EFFECT FOR THE ST LOUIS METROPOLITAN AREA.  ADDITIONAL THUNDERSTORMS
COULD STILL OCCUR LATER TONIGHT. KEEP ABREAST OF LATEST INFORMATION
AND POSSIBLE STATEMENTS OR WARNINGS FROM THE NATIONAL WEATHER SERVICE.

PEDIGO
Special weather statement, May 23, 7:34 PM CDT, 27 minutes before
ILZ064-065-069-070-074-079-100>102-MOZ047>049-059>065-072>075-084-
085-099-240230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
734 PM CDT SAT MAY 23 1998

...SEVERE THUNDERSTORM WATCH 401 HAS BEEN CANCELLED FOR ALL MISSOURI
COUNTIES AND RANDOLPH..MONROE..ST. CLAIR..AND MADISON COUNTIES IN
ILLINOIS. IT REMAINS IN EFFECT FOR BOND..FAYETTE..MARION..CLINTON..AND
WASHINGTON COUNTIES IN SOUTHWEST ILLLINOIS UNTIL 900 PM CDT.

THE SEVERE THUNDERSTORM WATCH CANCELLATION MEANS THERE IS NO WATCH IN
EFFECT FOR THE ST LOUIS METROPOLITAN AREA.  ADDITIONAL THUNDERSTORMS
COULD STILL OCCUR LATER TONIGHT. KEEP ABREAST OF LATEST INFORMATION
AND POSSIBLE STATEMENTS OR WARNINGS FROM THE NATIONAL WEATHER SERVICE.

PEDIGO

The office that day

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

IssuedProductOfficeCountiesLasted
May 23, 8:27 PM CDTTornado WarningLSXMarion33 min
May 24, 12:05 AM CDTSevere Thunderstorm WarningLSXAdams50 min
May 24, 12:21 AM CDTSevere Thunderstorm WarningLSXPike64 min
May 24, 12:31 AM CDTSevere Thunderstorm WarningLSXAdams49 min
May 24, 1:03 AM CDTSevere Thunderstorm WarningLSXPike47 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1998Every severe thunderstorm warning in 1998

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.