Alert archive / Illinois / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 103, NWS St. Louis, MO

May 12, 1998Macoupin County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 12, 1998, 11:22 PM CDT for Macoupin County, Illinois. It was in force for 48 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 12, 1998, 11:22 PM CDT (04:22 UTC)
Expired
May 13, 1998, 12:10 AM CDT
In force
48 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Macoupin County, IL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 12, 7:30 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 4.4 hours before the alert went out and 150 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 1998-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1906 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 1998-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
1906 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1317 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.7
Supercell composite
6.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 130422 RRA
SVRSTL
ILC117-130510-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1122 PM CDT TUE MAY 12 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MACOUPIN COUNTY IN SOUTHWESTERN ILLINOIS

* UNTIL 1210 AM CDT

* AT 1120 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR BUNKER HILL... MOVING NORTHEAST AT 20
  MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  BUNKER HILL
  WHITE CITY
  MT OLIVE



THIS STORM HAS A HISTORY OF DAMAGING HAIL. STAY INSIDE AND AWAY
FROM WINDOWS.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

GKS/GLASS

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 12, 7:40 PM CDT, 3 hours 42 minutes before
ILZ095>097-MOZ009-010-018-019-026-027-034>036-042-130145-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
740 PM CDT TUE MAY 12 1998

...SEVERE THUNDERSTORM WATCH 334 HAS BEEN CANCELLED...

SEVERE THUNDERSTORM WATCH 334 THAT WAS IN EFFECT FOR PORTIONS OF
NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS HAS BEEN CANCELLED.

THIS INCLUDES THE MISSOURI COUNTIES OF...

  SCOTLAND          CLARK         KNOX       LEWIS      SHELBY
  MARION            MONROE        RALLS      PIKE       AUDRAIN

AND THE ILLINOIS COUNTIES OF...

  ADAMS             BROWN         PIKE

METZE
Special weather statement, May 12, 7:40 PM CDT, 3 hours 42 minutes before
ILZ095>097-MOZ009-010-018-019-026-027-034>036-042-130145-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
740 PM CDT TUE MAY 12 1998

...SEVERE THUNDERSTORM WATCH 334 HAS BEEN CANCELLED...

SEVERE THUNDERSTORM WATCH 334 THAT WAS IN EFFECT FOR PORTIONS OF
NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS HAS BEEN CANCELLED.

THIS INCLUDES THE MISSOURI COUNTIES OF...

  SCOTLAND          CLARK         KNOX       LEWIS      SHELBY
  MARION            MONROE        RALLS      PIKE       AUDRAIN

AND THE ILLINOIS COUNTIES OF...

  ADAMS             BROWN         PIKE

METZE

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 7:04 PM CDTSevere Thunderstorm WarningLSXGreene51 min
May 12, 7:49 PM CDTSevere Thunderstorm WarningLSXMacoupin61 min
May 12, 8:16 PM CDTTornado WarningLSXMacoupin49 min
May 12, 8:43 PM CDTSevere Thunderstorm WarningLSXMontgomery47 min
May 12, 9:54 PM CDTSevere Thunderstorm WarningLSXMacoupin46 min
May 12, 9:56 PM CDTSevere Thunderstorm WarningLSXMontgomery49 min
May 12, 10:08 PM CDTTornado WarningLSXMontgomery47 min
May 12, 10:36 PM CDTSevere Thunderstorm WarningLSXMacoupin49 min
May 12, 11:00 PM CDTSevere Thunderstorm WarningLSXMontgomery50 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.