Alert archive / Illinois / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 13, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Apr 21, 1999, 8:39 PM CDT for Cook County, DuPage County, Kane County, Illinois. It was in force for 36 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
- Apr 21, 1999, 8:39 PM CDT (01:39 UTC)
- Expired
- Apr 21, 1999, 9:15 PM CDT
- In force
- 36 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Cook County, IL, DuPage County, IL, Kane County, IL
The radar
The Chicago radar (KLOT), 32 km from the middle of the area, began a volume at 01:23 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 |
|---|---|---|---|
| Apr 21, 8:39 PM CDT | Hail 1 | St Charles, IL | |
| Apr 21, 9:10 PM CDT | Hail 0.75 | Schaumburg, IL | |
| Apr 21, 9:20 PM CDT | Hail 1.75 | Bartlett, IL | Hail 7/8 inch in diameter fell at Bartlett and golf ball sized hail fell at Elmhurst. |
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 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 |
|---|---|---|---|---|
| Apr 21, 7:04 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois, Kankakee | 26 min |
| Apr 21, 9:24 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 36 min |
| Apr 21, 11:28 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Ogle | 47 min |
| Apr 22, 1:18 PM CDT | Flash Flood Warning | LOT | Iroquois, Kankakee | 6 hr |
| Apr 22, 1:18 PM CDT | Flash Flood Warning | LOT | Ford, Livingston | 6 hr |
| Apr 21, 7:25 PM CDT | Severe Thunderstorm Warning | LOT | Jasper, Porter | 35 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; radar from the NEXRAD Level II archive.