Alert archive / Illinois / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 20, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at Feb 27, 1999, 2:12 PM CST for Clay County, Illinois. It was in force for 48 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
- Feb 27, 1999, 2:12 PM CST (20:12 UTC)
- Expired
- Feb 27, 1999, 3:00 PM CST
- In force
- 48 min
- Issued by
- NWS Lincoln, IL
- Area
- Whole counties
County Clay County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 27, 2:36 PM CST | Hail 1 | Flora, 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, 8.2 hours before the alert went out and 156 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
- 107 J/kg
- Mixed-layer CIN
- -160 J/kg
- Mixed-layer LCL
- 635 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 275 m²/s²
- 0-3 km storm-relative helicity
- 325 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.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Lincoln, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 27, 2:05 PM CST, 7 minutes earlier.
Area forecast discussion, Feb 27, 2:05 PM CST, 7 minutes before
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</html>The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 27, 12:45 PM CST | Severe Thunderstorm Warning | ILX | Coles | 30 min |
| Feb 27, 1:08 PM CST | Severe Thunderstorm Warning | ILX | Effingham | 52 min |
| Feb 27, 1:14 PM CST | Severe Thunderstorm Warning | ILX | Edgar | 46 min |
| Feb 27, 1:26 PM CST | Severe Thunderstorm Warning | ILX | Cumberland | 49 min |
| Feb 27, 1:45 PM CST | Severe Thunderstorm Warning | ILX | Vermilion | 45 min |
| Feb 27, 1:56 PM CST | Severe Thunderstorm Warning | ILX | Effingham | 49 min |
| Feb 27, 2:01 PM CST | Severe Thunderstorm Warning | ILX | Clark | 59 min |
| Feb 27, 2:47 PM CST | Severe Thunderstorm Warning | ILX | Richland | 58 min |
| Feb 27, 2:49 PM CST | Severe Thunderstorm Warning | ILX | Jasper | 56 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1999Every severe thunderstorm warning in 1999
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.