Alert archive / Illinois / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 35, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at May 5, 1997, 2:02 PM CDT for Grundy County, Will County, Illinois. It was in force for 43 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
- May 5, 1997, 2:02 PM CDT (19:02 UTC)
- Expired
- May 5, 1997, 2:45 PM CDT
- In force
- 43 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Grundy County, IL, Will County, IL
The radar
The Chicago radar (KLOT), 28 km from the middle of the area, began a volume at 19:01 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 5, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 7.0 hours before the alert went out and 139 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
- 1877 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 228 m²/s²
- 0-3 km storm-relative helicity
- 250 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.
In the hours before
Special weather statement, May 5, 11:00 AM CDT, 3 hours 2 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001>005-010>016-019>020- 061100- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 1100 AM CDT MON MAY 5 1997 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST AND NORTH CENTRAL INDIANA THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATER THIS AFTERNOON AND EARLY THIS EVENING ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA. AN APPROACHING COLD FRONT ASSOCIATED WITH A VIGOROUS DISTURABANCE IN THE UPPER ATMOSPHERE WILL CREATE THE POTENTIAL FOR SCATTERED THUNDERSTORMS. SOME OF THESE STORMS COULD PRODUCE LARGE HAIL AND GUSTY WINDS. MERZLOCK
Special weather statement, May 5, 11:16 AM CDT, 2 hours 46 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001>005-010>016-019>020- 061100- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 1100 AM CDT MON MAY 5 1997 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST AND NORTH CENTRAL INDIANA THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATER THIS AFTERNOON AND EARLY THIS EVENING ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA. AN APPROACHING COLD FRONT ASSOCIATED WITH A VIGOROUS DISTU&RABANCE IN THE UPPER ATMOSPHERE WILL CREATE THE POTENTIAL FOR SCATTERED THUNDERSTORMS. SOME OF THESE STORMS COULD PRODUCE LARGE HAIL AND GUSTY WINDS. MERZLOCK
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 2:10 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 50 min |
| May 5, 2:24 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee | 51 min |
| May 5, 2:46 PM CDT | Severe Thunderstorm Warning | LOT | Porter | 29 min |
| May 5, 2:56 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 34 min |
| May 5, 3:15 PM CDT | Severe Thunderstorm Warning | LOT | Jasper, Porter | 30 min |
| May 5, 3:31 PM CDT | Severe Thunderstorm Warning | LOT | LaPorte, Starke | 29 min |
| May 5, 3:58 PM CDT | Severe Thunderstorm Warning | LOT | Benton | 32 min |
| May 5, 4:02 PM CDT | Severe Thunderstorm Warning | LOT | Marshall | 43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.