Alert archive / Illinois / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 115, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 15, 2003, 4:18 AM CDT for Cook County, DuPage County, Kane County, Illinois. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 15, 2003, 4:18 AM CDT (09:18 UTC)
- Expired
- Jul 15, 2003, 5:00 AM CDT
- In force
- 42 min
- Issued by
- NWS Chicago, IL
- Area
- Counties, with a storm outline in the text
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 09:21 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.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 9.3 hours before the alert went out and 205 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2108 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 15, 3:20 AM CDT, 58 minutes earlier.
Area forecast discussion, Jul 15, 3:20 AM CDT, 58 minutes before
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</html>Hazardous weather outlook, Jul 14, 5:12 PM CDT, 11 hours 6 minutes before
ILZ003>006-008-010>014-019-020>023-032-033-039-INZ001-002-010-011-019
-151100-
HAZARDOUS WEATHER OUTLOOK...CORRECTION
NATIONAL WEATHER SERVICE CHICAGO IL
345 PM CDT MON JUL 14 2003
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST
ILLINOIS...NORTHWEST INDIANA...AND THE ADJACENT WATERS OF LAKE
MICHIGAN.
.DAY ONE... TONIGHT
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS AFTER MIDNIGHT ACROSS
THE OUTLOOK REGION.
THUNDERSTORMS WILL FORM AHEAD OF A COLD FRONT THAT WILL MOVE INTO
INTO NORTHWEST ILLINOIS AND CENTRAL WISCONSIN BY TUESDAY MORNING.
THUNDERSTORMS WILL LIKELY MOVE INTO THE ROCKFORD AND DIXON AREAS OF
NORTH CENTRAL ILLINOIS AROUND MIDNIGHT...THEN MOVE TO APPROXIMATELY
A CHICAGO TO WATSEKA LINE DURING THE EARLY MORNING HOURS...AND INTO
NORTHWEST INDIANA AROUND SUNRISE.
THE MAIN THREAT WILL BE LARGE HAIL AND DAMAGING WINDS.
.DAYS TWO THROUGH SEVEN... TUESDAY THROUGH SUNDAY
THUNDERSTORMS WILL LINGER INTO TUESDAY MORNING...ESPECIALLY ACROSS
EASTERN PORTIONS OF THE OUTLOOK AREA. THE NEXT CHANCE OF
THUNDERSTORMS AFTER TUESDAY WILL BE FROM LATE THURSDAY NIGHT THROUGH
SATURDAY MORNING.
FLOODING CONTINUES ON THE IROQUOIS RIVER IN IROQUOIS COUNTY IN
ILLINOIS. SEE THE LATEST FLOOD STATEMENTS FOR FURTHER DETAILS.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS MAY BE NEEDED OVERNIGHT TONIGHT.
&&
NWS CHICAGO WEBPAGE
HTTP://WWW.CRH.NOAA.GOV/LOT (LOWER CASE)
OR HTTP://WEATHER.NOAA.GOV/CHICAGO (LOWER CASE)
RATZERThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 3:17 AM CDT | Special Marine Warning | LOT | 103 min | |
| Jul 15, 4:26 AM CDT | Special Marine Warning | LOT | 2 hr | |
| Jul 15, 4:26 AM CDT | Special Marine Warning | LOT | 2 hr | |
| Jul 15, 4:58 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 32 min |
| Jul 15, 5:25 AM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kankakee, Will | 35 min |
| Jul 15, 6:20 AM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 25 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2003Every severe thunderstorm warning in 2003
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.