Alert archive / Illinois / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 7, NWS St. Louis, MO

March 28, 1997Bond County, Madison County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 28, 1997, 2:02 PM CST for Bond County, Madison County, Illinois. It was in force for 43 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Mar 28, 1997, 2:02 PM CST (20:02 UTC)
Expired: Mar 28, 1997, 2:45 PM CST
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties Bond County, IL, Madison County, IL

The radar

The St Louis radar (KLSX), 90 km from the middle of the area, began a volume at 20:02 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.

What was reported inside it

Time	Report	Where	Remark
Mar 28, 2:55 PM CST	Hail 0.75	Troy, IL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.0 hours before the alert went out and 170 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: 127 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 815 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 282003 RRA
SVRSTL
ILC005-119-282045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
202 PM CST FRI MAR 28 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  245 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL ILLINOIS
 
   ...BOND COUNTY
 
IN SOUTHWEST ILLINOIS
 
   ...EASTERN MADISON COUNTY
 
 
AT 200 PM...RADAR DETECTED A SEVERE THUNDERSTORM NEAR THE TOWN OF
HIGHLAND AND COLLINSVILLE. THE SEVERE THUNDERSTORM WAS MOVING NORTHEAST
AT 40 MPH. THE STORM WILL MOVE THROUGH THE TOWNS OF HIGHLAND AND
GREENVILLE BETWEEN 215 AND 240 PM.
 
 
 
THIS IS A DANGEROUS STORM! BE PREPARED FOR DAMAGING WINDS...HAIL
AND DEADLY LIGHTNING. STAY INSIDE AND AWAY FROM WINDOWS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 28, 2:08 PM CST	Severe Thunderstorm Warning	LSX	Greene	52 min
Mar 28, 2:27 PM CST	Severe Thunderstorm Warning	LSX	Randolph	48 min
Mar 28, 2:45 PM CST	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	45 min
Mar 28, 2:52 PM CST	Severe Thunderstorm Warning	LSX	Saint Clair, Washington	53 min
Mar 28, 3:20 PM CST	Severe Thunderstorm Warning	LSX	Washington	40 min
Mar 28, 3:27 PM CST	Severe Thunderstorm Warning	LSX	Macoupin	48 min
Mar 28, 4:02 PM CST	Severe Thunderstorm Warning	LSX	Clinton, Marion	43 min
Mar 28, 4:15 PM CST	Severe Thunderstorm Warning	LSX	Fayette	45 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.