Alert archive / Illinois / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 71, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 24, 1997, 6:00 PM CDT for McHenry County, Illinois. It was in force for 45 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
- Jun 24, 1997, 6:00 PM CDT (23:00 UTC)
- Expired
- Jun 24, 1997, 6:45 PM CDT
- In force
- 45 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
County McHenry County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 24, 6:05 PM CDT | Thunderstorm Wind 50 | Harvard, IL | A line of severe thunderstorms extended from north central Illinois, north, into southern Wisconsin. As the storms moved east and through northern Illinois, they produced wind damage, including trees blown down. |
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
Davenport, (KDVN), launched 12:00Z, 11.0 hours before the alert went out and 187 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
- 1124 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1151 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 6:27 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 48 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.