Alert archive / Illinois / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 147, NWS St. Louis, MO

May 22, 1998Montgomery County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 22, 1998, 4:44 AM CDT for Montgomery County, Illinois. It was in force for 51 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 22, 1998, 4:44 AM CDT (09:44 UTC)
Expired
May 22, 1998, 5:35 AM CDT
In force
51 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Montgomery County, IL

The radar

The Lincoln radar (KILX), 103 km from the middle of the area, began a volume at 09:45 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

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

IssuedProductOfficeLasted
May 22, 2:00 AM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 9.7 hours before the alert went out and 127 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 1998-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1998-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1615 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
137 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.

773 
WUUS1 KSTL 220945 RRA
SVRSTL
ILC135-221035-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
444 AM CDT FRI MAY 22 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 535 AM CDT

* AT 443 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 5 EAST OF CARLINVILLE TO
  GILLESPIE... MOVING EAST AT 30 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  LITCHFIELD
  HILSBORO

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.

DM/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 22, 4:31 AM CDT, 13 minutes before
ILZ095>097-MOZ036-221000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
431 AM CDT FRI MAY 22 1998

...SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR A PORTION OF
WEST CENTRAL ILLINOIS AND EAST CENTRAL MISSOURI...

SEVERE THUNDERSTORM WATCH 395 IS NO LONGER IN EFFECT FOR THE ILLINOIS
COUNTIES OF ADAMS...BROWN...AND PIKE...AND FOR PIKE COUNTY MISSOURI AS
WELL.

THE THREAT OF SEVERE WEATHER HAS SUBSIDED IN THESE AREAS.

TRUETT&
Special weather statement, May 22, 4:31 AM CDT, 13 minutes before
ILZ095>097-MOZ036-221000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
431 AM CDT FRI MAY 22 1998

...SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR A PORTION OF
WEST CENTRAL ILLINOIS AND EAST CENTRAL MISSOURI...

SEVERE THUNDERSTORM WATCH 395 IS NO LONGER IN EFFECT FOR THE ILLINOIS
COUNTIES OF ADAMS...BROWN...AND PIKE...AND FOR PIKE COUNTY MISSOURI AS
WELL.

THE THREAT OF SEVERE WEATHER HAS SUBSIDED IN THESE AREAS.

TRUETT&

The office that day

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

IssuedProductOfficeCountiesLasted
May 22, 1:06 AM CDTSevere Thunderstorm WarningLSXJersey64 min
May 22, 1:20 AM CDTSevere Thunderstorm WarningLSXCalhoun65 min
May 22, 1:52 AM CDTSevere Thunderstorm WarningLSXMadison63 min
May 22, 2:12 AM CDTSevere Thunderstorm WarningLSXJersey33 min
May 22, 2:17 AM CDTSevere Thunderstorm WarningLSXAdams48 min
May 22, 2:34 AM CDTSevere Thunderstorm WarningLSXPike61 min
May 22, 2:59 AM CDTTornado WarningLSXPike51 min
May 22, 3:31 AM CDTSevere Thunderstorm WarningLSXCalhoun, Greene64 min
May 22, 3:50 AM CDTSevere Thunderstorm WarningLSXMacoupin65 min
May 22, 4:08 AM CDTSevere Thunderstorm WarningLSXJersey47 min
May 22, 5:02 AM CDTSevere Thunderstorm WarningLSXBond48 min
May 22, 5:20 AM CDTSevere Thunderstorm WarningLSXFayette50 min
May 22, 5:40 AM CDTSevere Thunderstorm WarningLSXMarion50 min
May 22, 7:35 AM CDTSevere Thunderstorm WarningLSXAdams35 min
May 22, 8:00 AM CDTSevere Thunderstorm WarningLSXBrown, Pike50 min
May 22, 8:52 AM CDTSevere Thunderstorm WarningLSXGreene, Macoupin33 min
May 22, 9:22 AM CDTSevere Thunderstorm WarningLSXMontgomery48 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; radar from the NEXRAD Level II archive.