Alert archive / Illinois / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 117, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 21, 1997, 6:08 PM CDT for Saint Clair County, Illinois. It was in force for 52 min. 4 reports 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
- Jun 21, 1997, 6:08 PM CDT (23:08 UTC)
- Expired
- Jun 21, 1997, 7:00 PM CDT
- In force
- 52 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Saint Clair County, IL
The radar
The St Louis radar (KLSX), 70 km from the middle of the area, began a volume at 23:09 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 |
|---|---|---|---|
| Jun 21, 6:15 PM CDT | Thunderstorm Wind 61 | Millstadt, IL | Wind gusts estimated at 70 mph downed trees and some power poles. |
| Jun 21, 6:25 PM CDT | Thunderstorm Wind 65 | Freeburg, IL | Wind gusts estimated at 75 mph downed trees, power lines, and damaged roofs. The roof of one busines was completely blown off. |
| Jun 21, 6:30 PM CDT | Thunderstorm Wind 61 | Lenzburg, IL | Wind gusts estimated at 70 mph downed trees and power lines across town. |
| Jun 21, 6:35 PM CDT | Thunderstorm Wind 61 | Marissa, IL | Wind gusts downed trees and power lines. |
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, 11.1 hours before the alert went out and 219 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.
- Mixed-layer CAPE
- 3170 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 624 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
182 WUUS1 KSTL 212310 RRA SVRSTL ILC163-220000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 608 PM CDT SAT JUN 21 1997 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHWEST ILLINOIS ...SOUTHERN ST. CLAIR COUNTY AT 608 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS DETECTING A LINE OF SEVERE THUNDERSTORMS FROM MILLSTADT TO 5 MILES EAST OF FREEBURG. THE LINE WAS MOVING TO THE SOUTHEAST AT 10 MPH. TOWNS IN THE PATH ARE FREEBURG...SMITHTON AND NEW ATHENS. THIS IS A DANGEROUS STORM BE PREPARED FOR DAMAGING WINDS...HAIL AND DEADLY LIGHTNING. STAY INSIDE AND AWAY FROM WINDOWS. GKS/RP
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 4:39 PM CDT | Severe Thunderstorm Warning | LSX | Madison | 51 min |
| Jun 21, 5:18 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 57 min |
| Jun 21, 5:32 PM CDT | Severe Thunderstorm Warning | LSX | Clinton | 43 min |
| Jun 21, 5:44 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Marion | 46 min |
| Jun 21, 6:31 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 44 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.