Alert archive / Illinois / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 16, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 12, 2001, 12:02 AM CDT for Cook County, DuPage County, Kane County, Illinois. It was in force for 28 min. 2 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 12, 2001, 12:02 AM CDT (05:02 UTC)
- Expired
- Jun 12, 2001, 12:30 AM CDT
- In force
- 28 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 05:03 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 12, 12:05 AM CDT | Hail 1.25 | Carol Stream, IL | |
| Jun 12, 12:20 AM CDT | Hail 0.75 | Chicago, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 11, 10:30 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 5.0 hours before the alert went out and 199 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
- 3690 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1398 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 5.7
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 Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 11, 9:18 PM CDT, 2 hours 44 minutes earlier.
Area forecast discussion, Jun 11, 9:18 PM CDT, 2 hours 44 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO IL 918 PM CDT MON JUN 11 2001 ZONES UPDATED TO REFLECT SE TURN OF DEVELOPING BOW ECHO OVER C WISCONSIN. STORMS SHOULD CONTINUE TO TURN SE AND MOVE ALONG/JUST NORTH OF WARM FRONT AT 9 PM FROM AROUND LSE-JVL-ARR-VPZ. VERY UNSTABLE ON WARM SIDE WITH 8 PM CAPES OVER 4000 AND SE SFC-6KM SHEAR VECTOR OF 65 KTS OVER SW WI. CORFIDI VECTORS SHOWED THIS TURN NICELY. IMMEDIATE LAKE SHORE MAgY BE STABILIZED A BIT BY LAKE BREEZE. AF
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 10:38 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 67 min |
| Jun 11, 10:38 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Kane, McHenry | 67 min |
| Jun 11, 10:38 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 67 min |
| Jun 11, 11:43 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Lake, McHenry | 32 min |
| Jun 11, 11:43 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Ogle, Winnebago | 32 min |
| Jun 12, 12:28 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Kane, Kendall, Will | 32 min |
| Jun 12, 12:59 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 31 min |
| Jun 12, 11:56 AM CDT | Severe Thunderstorm Warning | LOT | Lee | 34 min |
| Jun 12, 12:28 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle, Lee | 32 min |
| Jun 12, 12:28 AM CDT | Severe Thunderstorm Warning | LOT | Porter | 32 min |
| Jun 12, 12:59 AM CDT | Severe Thunderstorm Warning | LOT | Jasper, Porter | 31 min |
| Jun 12, 12:59 AM CDT | Severe Thunderstorm Warning | LOT | Newton | 31 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2001Every severe thunderstorm warning in 2001
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.