Alert archive / Illinois / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 40, NWS St. Louis, MO

April 30, 1997Bond County, Fayette County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 30, 1997, 2:51 PM CDT for Bond County, Fayette County, Illinois. It was in force for 54 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, 2:51 PM CDT (19:51 UTC)
Expired: Apr 30, 1997, 3:45 PM CDT
In force: 54 min
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties Bond County, IL, Fayette County, IL

The radar

The St Louis radar (KLSX), 129 km from the middle of the area, began a volume at 19:52 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.

Issued	Product	Office	Lasted
Apr 30, 2:30 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.9 hours before the alert went out and 145 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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 301951 RRA
SVRSTL
ILC005-051-302045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
251 PM CDT WED APR 30 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  345 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL ILLINOIS
 
   ...BOND COUNTY...NORTHERN FAYETTE COUNTY
 
AT 250 PM...DOPPLER RADAR SHOWED SEVERE THUNDERSTORMS ENTERING WESTERN
BOND COUNTY MOVING NORTHEAST AT 40 TO 45 MPH. TOWNS IN THE PATH OF THESE
STORMS INCLUDE MULBERRY GROVE...GREENVILLE AND RAMSEY.
 
 
REMEMBER...A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.
IF OUTDOORS...SEEK INSIDE SHELTER IMMEDIATELY. STAY AWAY FROM
WINDOWS.
 
LEWIS/RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 1:31 PM CDT	Severe Thunderstorm Warning	LSX	Adams	29 min
Apr 30, 1:42 PM CDT	Tornado Warning	LSX	Adams	48 min
Apr 30, 2:23 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	52 min
Apr 30, 2:28 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	47 min
Apr 30, 2:33 PM CDT	Tornado Warning	LSX	Macoupin	42 min
Apr 30, 2:47 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	43 min
Apr 30, 2:58 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	47 min
Apr 30, 3:29 PM CDT	Severe Thunderstorm Warning	LSX	Washington	46 min
Apr 30, 3:43 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	32 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1997 Every 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.