Alert archive / Illinois / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 43, NWS St. Louis, MO

April 30, 1997Fayette County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 30, 1997, 3:43 PM CDT for Fayette County, Illinois. It was in force for 32 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
Apr 30, 1997, 3:43 PM CDT (20:43 UTC)
Expired
Apr 30, 1997, 4:15 PM CDT
In force
32 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Fayette County, IL

The radar

The Lincoln radar (KILX), 131 km from the middle of the area, began a volume at 20:42 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
Apr 30, 2:30 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.7 hours before the alert went out and 133 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 12:00Z on 1997-04-30Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 1997-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 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
1130 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
166 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 302043 RRA
SVRSTL
ILC051-302115-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
343 PM CDT WED APR 30 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  415 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTH CENTRAL ILLINOIS
 
   ...FAYETTE COUNTY
 
AT 340 PM...DOPPLER RADAR INDICATED TWO SEVERE THUNDERSTORMS OVER
CENTRAL FAYETTE COUNTY 5 MILES NORTH OF THE TOWN OF VANDALIA MOVING TO
THE NORTHEAST AT 45 MPH. TOWNS IN THE PATHS OF THESE STORMS ARE WRIGHTS
CORNER AND PRUETT. PEOPLE IN THESE COMMUNITIES SHOULD TAKE SHELTER
IMMEDIATELY.
 
REMEMBER...A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.
IF OUTDOORS...SEEK INSIDE SHELTER IMMEDIATELY. STAY AWAY FROM
WINDOWS.
 
LEWIS/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, Apr 30, 11:33 AM CDT, 4 hours 10 minutes before
MOZ042-041-050-010-048-072-062-059-084-018-019-052-085-027-047-
051-034-049-036-035-099-061-075-074-063-064-009-026-060-073-ILZ095-
064-096-098-069-065-058-099-059-100-070-102-060-097-079-101-074-
MOZ065-291600-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1130 AM CST WED APR 30 1997

THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE
IN ST LOUIS.  AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND
EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS.

THERE IS A MODERATE RISK OF SEVERE WEATHER THIS AFTERNOON OVER
EXTREME EASTERN MISSOURI AND CENTRAL AND NORTHERN ILLINOIS. THIS IS
AN AREA GENERALLY NORTH AND EAST OF A LINE FROM SALEM ILLINOIS
TO ST. LOUIS NORTHWEST ALONG THE MISSISSIPPI RIVER TO THE IOWA BORDER.

THERE IS ALSO A SLIGHT RISK OF SEVERE WEATHER ACROSS MUCH OF THE
EASTERN HALF OF MISSOURI AND NORTHERN ILLINOIS. THE SLIGHT RISK AREA
COVERS THE REST OF THE ST. LOUIS COUNTY WARNING AREA.

A LOW PRESSURE SYSTEM IS MOVING RAPIDLY NORTHEAST ACROSS NORTHERN
MISSOURI THIS MORNING...AND WILL MOVE INTO NORTHEASTERN ILLINOIS BY
THIS EVENING. A COLD FRONT WILL SWEEP EASTWARD ACROSS EASTERN
MISSOURI THIS AFTERNOON...TRIGGERING STRONG THUNDERSTORMS. SOME \OF
THESE STORMS MAY BECOME SEVERE.

STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD KEEP ADVISED OF
THE LATEST FORECAST FOR POSSIBLE SKYWARN ACTION FROM LATE THIS
MORNING THROUGH THE EARLY EVENING.

WDB
Special weather statement, Apr 30, 12:30 PM CDT, 3 hours 13 minutes before
MOZ042-041-050-010-048-072-062-059-084-018-019-052-085-027-047-
051-034-049-036-035-099-061-075-074-063-064-009-026-060-073-ILZ095-
064-096-098-069-065-058-099-059-100-070-102-060-097-079-101-074-
MOZ065-291600-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1130 AM CST WED APR 30 1997

THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE
IN ST LOUIS.  AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND
EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS.

THERE IS A MODERATE RISK OF SEVERE WEATHER THIS AFTERNOON OVER
EXTREME EASTERN MISSOURI AND CENTRAL AND NORTHERN ILLINOIS. THIS IS
AN AREA GENERALLY NORTH AND EAST OF A LINE FROM SALEM ILLINOIS
TO ST. LOUIS NORTHWEST ALONG THE MISSISSIPPI RIVER TO THE IOWA BORDER.

THERE IS ALSO A SLIGHT RISK OF SEVERE WEATHER ACROSS MUCH OF THE
EASTERN HALF OF MISSOURI AND NORTHERN ILLINOIS. THE SLIGHT RISK AREA
COVERS THE REST OF THE ST. LOUIS COUNTY WARNING AREA.

A LOW PRESSURE SYSTEM IS MOVING RAPIDLY NORTHEAST ACROSS NORTHERN
MISSOURI THIS MORNING...AND WILL MOVE INTO NORTHEASTERN ILLINOIS BY
THIS EVENING. A COLD FRONT WILL SWEEP EASTWARD ACROSS EASTERN
MISSOURI THIS AFTERNOON...TRIGGERING STRONG THUNDERSTORMS. SOME OF
THESE STORMS MAY BECOME SEVERE.

STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD KEEP ADVISED OF
THE LATEST FORECAST FOR POSSIBLE SKYWARN ACTION FROM LATE THIS
MORNING THROUGH THE EARLY EVENING.

WDB

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 1:31 PM CDTSevere Thunderstorm WarningLSXAdams29 min
Apr 30, 1:42 PM CDTTornado WarningLSXAdams48 min
Apr 30, 2:23 PM CDTSevere Thunderstorm WarningLSXSaint Clair52 min
Apr 30, 2:28 PM CDTSevere Thunderstorm WarningLSXMacoupin47 min
Apr 30, 2:33 PM CDTTornado WarningLSXMacoupin42 min
Apr 30, 2:47 PM CDTSevere Thunderstorm WarningLSXRandolph43 min
Apr 30, 2:51 PM CDTSevere Thunderstorm WarningLSXBond, Fayette54 min
Apr 30, 2:58 PM CDTSevere Thunderstorm WarningLSXMontgomery47 min
Apr 30, 3:29 PM CDTSevere Thunderstorm WarningLSXWashington46 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; radar from the NEXRAD Level II archive.