Alert archive / Illinois / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 316, NWS St. Louis, MO

July 22, 1998Washington County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 22, 1998, 8:42 PM CDT for Washington 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
Jul 22, 1998, 8:42 PM CDT (01:42 UTC)
Expired
Jul 22, 1998, 9:30 PM CDT
In force
48 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Washington County, IL

The radar

The St Louis radar (KLSX), 117 km from the middle of the area, began a volume at 01:45 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 nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.7 hours before the alert went out and 212 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 1998-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 370 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 1998-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 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
370 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
990 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

551 
WUUS1 KSTL 230143 RRA
SVRSTL
ILC189-230230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
842 PM CDT WED JUL 22 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN WASHINGTON COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS

* UNTIL 930 PM CDT

* AT 840 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM ENTERING WESTERN WASHINGTON COUNTY... MOVING
  EAST AT 20 TO 25 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  NASHVILLE
  RICHVIEW
  ASHLEY
  DUBOIS

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.

RP / DF

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, Jul 22, 3:37 PM CDT, 5 hours 5 minutes before
ILZ058>060-064-065-069-070-074-079-098>102-MOZ052-060>065-072>075-
084-085-099-222300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
337 PM CDT WED JUL 22 1998

...HEAT ADVISORY WILL BE ALLOWED TO EXPIRED FOR PORTIONS OF EAST
CENTRAL MISSOURI AND SOUTHWEST ILLINOIS THIS AFTERNOON...

IT WAS ANOTHER HOT AND HUMID DAY ACROSS MUCH OF EAST CENTRAL
MISSOURI AND SOUTHWEST ILLINOIS.  WEDNESDAY AFTERNOON TEMPERATURES
REACHED INTO THE MIDDLE 90S WITH HEAT INDICES BETWEEN 105 AND 115
DEGREES.

A COLD FRONT WILL MOVE ACROSS THE BI-STATE AREA TONIGHT AND THURSDAY
WITH SCATTERED SHOWERS AND THUNDERSTORMS AND MORE CLOUD COVER
EXPECTED.  THURSDAY'S HIGH TEMPERATURES WILL LIKELY BE IN THE 80S
ACROSS EAST CENTRAL MISSOURI AND SOUTHWEST ILLINOIS.  THUS...THE
HEAT ADVISORY WILL BE ALLOWED TO EXPIRE LATE THIS AFTERNOON AND NOT
RE-ISSUED AT THIS TIME.

METZE
Special weather statement, Jul 22, 3:37 PM CDT, 5 hours 5 minutes before
ILZ058>060-064-065-069-070-074-079-098>102-MOZ052-060>065-072>075-
084-085-099-222300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
337 PM CDT WED JUL 22 1998

...HEAT ADVISORY WILL BE ALLOWED TO EXPIRED FOR PORTIONS OF EAST
CENTRAL MISSOURI AND SOUTHWEST ILLINOIS THIS AFTERNOON...

IT WAS ANOTHER HOT AND HUMID DAY ACROSS MUCH OF EAST CENTRAL
MISSOURI AND SOUTHWEST ILLINOIS.  WEDNESDAY AFTERNOON TEMPERATURES
REACHED INTO THE MIDDLE 90S WITH HEAT INDICES BETWEEN 105 AND 115
DEGREES.

A COLD FRONT WILL MOVE ACROSS THE BI-STATE AREA TONIGHT AND THURSDAY
WITH SCATTERED SHOWERS AND THUNDERSTORMS AND MORE CLOUD COVER
EXPECTED.  THURSDAY'S HIGH TEMPERATURES WILL LIKELY BE IN THE 80S
ACROSS EAST CENTRAL MISSOURI AND SOUTHWEST ILLINOIS.  THUS...THE
HEAT ADVISORY WILL BE ALLOWED TO EXPIRE LATE THIS AFTERNOON AND NOT
RE-ISSUED AT THIS TIME.

METZE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 7:27 PM CDTSevere Thunderstorm WarningLSXMonroe48 min
Jul 22, 7:42 PM CDTSevere Thunderstorm WarningLSXSaint Clair48 min
Jul 22, 7:57 PM CDTSevere Thunderstorm WarningLSXMadison48 min
Jul 22, 8:14 PM CDTSevere Thunderstorm WarningLSXMonroe, Randolph46 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.