Alert archive / Illinois / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 116, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Jun 21, 1997, 5:44 PM CDT for Clinton County, Marion County, Illinois. It was in force for 46 min. 3 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, 5:44 PM CDT (22:44 UTC)
- Expired
- Jun 21, 1997, 6:30 PM CDT
- In force
- 46 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Clinton County, IL, Marion County, IL
The radar
The St Louis radar (KLSX), 132 km from the middle of the area, began a volume at 22:45 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 21, 5:45 PM CDT | Thunderstorm Wind 52 | Boulder, IL | County sheriff reported power lines down in Boulder and near Carlyle Lake, |
| Jun 21, 6:00 PM CDT | Thunderstorm Wind 52 | Germantown, IL | County sheriff reported trees down on the east side of town. |
| Jun 21, 6:05 PM CDT | Thunderstorm Wind 65 | Alma, IL | Wind gusts estimated at 75 mph downed trees and power lines and caused some roof damage. Much of the roof damage was caused by trees falling on structures. |
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, 10.7 hours before the alert went out and 176 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.
025 WUUS1 KSTL 212246 RRA SVRSTL ILC027-121-212330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 544 PM CDT SAT JUN 21 1997 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 630 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTH CENTRAL ILLINOIS ...EASTERN CLINTON COUNTY...WESTERN MARION COUNTY AT 544 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS DETECTING A SEVERE THUNDERSTORM 1 MILE NORTH OF BOULDER ILLINOIS. THE STORMS WAS MOVING TO THE SOUTHEAST AT 10 MPH. IT WILL MOVE THROUGH THE TOWNS OF SANDOVEL...FAIRMAN AND ODIN. IT WILL PRODUCE LARGE HAIL AND TORRENTIAL RAINS. THIS STORM HAS A HISTORY OF DAMAGING HAIL. 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, 6:08 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 52 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.