Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 21, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at May 12, 1998, 10:05 PM CDT for Lee County, Ogle County, Illinois. It was in force for 60 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
- May 12, 1998, 10:05 PM CDT (03:05 UTC)
- Expired
- May 12, 1998, 11:05 PM CDT
- In force
- 60 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Lee County, IL, Ogle County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 12, 10:28 PM CDT | Hail 0.75 | Oregon, IL | |
| May 12, 10:30 PM CDT | Hail 1 | Amboy, IL | Some residents in the western part of the county sustained to their homes as winds and large hail brokewindows. A garage was blown off its foundation and shifted. The roof of another garage was blown off. |
| May 12, 11:03 PM CDT | Hail 0.75 | Paw Paw, 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 |
|---|---|---|---|
| May 12, 7:30 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 3.1 hours before the alert went out and 203 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
- 1906 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 1317 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 6.2
The text
As transmitted, in the capitals the NWS used until 2016.
552 WUUS1 KCHI 130308 RRA SVRCHI ILC103-141-130404- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHICAGO IL 1005 PM CDT TUE MAY 12 1998 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... LEE COUNTY IN NORTH CENTRAL ILLINOIS OGLE COUNTY IN NORTH CENTRAL ILLINOIS * UNTIL 1105 PM CDT * AT 1005 PM CDT SEVERE THUNDERSTORMS WERE LOCATED FROM 5 MILES WEST OF DIXON TO NEAR WALNUT IN WESTERN LEE COUNTY. THE STORMS WERE MOVING TO THE NORTHEAST AT 40 MPH. * THE SEVERE THUNDERSTORMS WILL BE NEAR... AMBOY AND OREGON AT 1025 PM THIS IS A DANGEROUS STORM STAY INDOORS...AWAY FROM WINDOWS $$ KAHN/ALLSOPP
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 7:07 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall | 23 min |
| May 12, 7:07 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall | 83 min |
| May 12, 8:11 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 49 min |
| May 12, 8:42 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb | 53 min |
| May 12, 9:09 PM CDT | Severe Thunderstorm Warning | LOT | Kane | 61 min |
| May 12, 9:38 PM CDT | Severe Thunderstorm Warning | LOT | Lake, McHenry | 62 min |
| May 12, 9:46 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 44 min |
| May 12, 10:20 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 25 min |
| May 12, 11:03 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle | 57 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 1998Every severe thunderstorm warning in 1998
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.