Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 62, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 25, 1998, 8:59 PM CDT for Lake County, Illinois. It was in force for 56 min. 1 report 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 25, 1998, 8:59 PM CDT (01:59 UTC)
- Expired
- Jun 25, 1998, 9:55 PM CDT
- In force
- 56 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
County Lake County, IL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 25, 9:15 PM CDT | Thunderstorm Wind 50 | Countywide, 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 nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.0 hours before the alert went out and 233 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
- 3869 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1276 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 87 m²/s²
- 0-3 km storm-relative helicity
- 185 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 9.7
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.
In the hours before
Special weather statement, Jun 25, 4:15 PM CDT, 4 hours 44 minutes before
ILZ005>006-012>014-020-022-INZ001-251100- HEAT WARNING NATIONAL WEATHER SERVICE CHICAGO IL 415 PM CDT THU JUN 25 1998 ...HEAT WARNING FOR THE CHICAGO METROPOLITAN AREA THROUGH FRIDAY AND MAY BE EXTENDED THROUGH THE WEEKEND... THE HEAT WARNING INCLUDES THE FOLLOWING COUNTIES... IN ILLINOIS...COOK DUPAGE KANE KENDALL LAKE MCHENRY AND WILL. THIS INCLUDES THE CITIES/TOWNS OF CHICAGO WHEATON AURORA WAUKEGAN WOODSTOCK AND JOLIET. IN INDIANA...LAKE. THIS INCLUDES THE CITY/TOWN OF GARY. A HEAT WARNING WILL REMAIN IN EFFECT FOR METROPOLITAN CHICAGO AT LEAST THROUGH FRIDAY AND MAY REMAIN IN EFFECT THROUGH THE WEEKEND. TONIGHTS LOW SHOULD REMAIN ABOVE 75...CLOSER TO 80 IN DOWNTOWN CHICAGO WITH HEAT INDICES REMAINING ABOVE 80. HEAT INDICES FRIDAY WILL AGAIN CLIMB AS HIGH AS 105. PRESENTLY WE EXPECT SIMILAR CONDITIONS FRIDAY NIGHT AND SATURDAY SO THE WARNING MAY BE EXTENDED ANOTHER DAY. THIS IS A LIFE THREATENING HEAT WAVE ESPECIALLY IN DENSELY POPULATED URBAN AREAS. PEOPLE MOST AT RISK ARE THE ELDERLY AND THOSE WITH CHRONIC HEALTH PROBLEMS. THE BEST WAY TO SURVIVE THE HEAT IS TO SPEND AS MUCH TIME AS POSSIBLE IN AIR CONDITIONING... DRINK PLENTY OF WATER OR FRUIT JUICES AND CURTAIL STRENUOUS ACTIVITIES. FOR CITY OF CHICAGO HEAT SERVICES CALL...312-744-5000. KAPLAN
Special weather statement, Jun 25, 4:15 PM CDT, 4 hours 44 minutes before
ILZ005>006-012>014-020-022-INZ001-251100- HEAT WARNING NATIONAL WEATHER SERVICE CHICAGO IL 415 PM CDT THU JUN 25 1998 ...HEAT WARNING FOR THE CHICAGO METROPOLITAN AREA THROUGH FRIDAY AND MAY BE EXTENDED THROUGH THE WEEKEND... THE HEAT WARNING INCLUDES THE FOLLOWING COUNTIES... IN ILLINOIS...COOK DUPAGE KANE KENDALL LAKE MCHENRY AND WILL. THIS INCLUDES THE CITIES/TOWNS OF CHICAGO WHEATON AURORA WAUKEGAN WOODSTOCK AND JOLIET. IN INDIANA...LAKE. THIS INCLUDES THE CITY/TOWN OF GARY. A HEAT WARNING WILL REMAIN IN EFFECT FOR METROPOLITAN CHICAGO AT LEAST THROUGH FRIDAY AND MAY REMAIN IN EFFECT THROUGH THE WEEKEND. TONIGHTS LOW SHOULD REMAIN ABOVE 75...CLOSER TO 80 IN DOWNTOWN CHICAGO WITH HEAT INDICES REMAINING ABOVE 80. HEAT INDICES FRIDAY WILL AGAIN CLIMB AS HIGH AS 105. PRESENTLY WE EXPECT SIMILAR CONDITIONS FRIDAY NIGHT AND SATURDAY SO THE WARNING MAY BE EXTENDED ANOTHER DAY. THIS IS A LIFE THREATENING HEAT WAVE ESPECIALLY IN DENSELY POPULATED URBAN AREAS. PEOPLE MOST AT RISK ARE THE ELDERLY AND THOSE WITH CHRONIC HEALTH PROBLEMS. THE BEST WAY TO SURVIVE THE HEAT IS TO SPEND AS MUCH TIME AS POSSIBLE IN AIR CONDITIONING... DRINK PLENTY OF WATER OR FRUIT JUICES AND CURTAIL STRENUOUS ACTIVITIES. FOR CITY OF CHICAGO HEAT SERVICES CALL...312-744-5000. KAPLAN
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 8:22 PM CDT | Severe Thunderstorm Warning | LOT | Winnebago | 63 min |
| Jun 25, 8:41 PM CDT | Tornado Warning | LOT | Winnebago | 44 min |
| Jun 25, 8:59 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry | 56 min |
| Jun 25, 9:14 PM CDT | Tornado Warning | LOT | Lake, McHenry | 31 min |
| Jun 25, 9:26 PM CDT | Tornado Warning | LOT | McHenry | 34 min |
| Jun 26, 12:20 AM CDT | Flash Flood Warning | LOT | Boone, Winnebago | 6 hr |
| Jun 26, 12:20 AM CDT | Flash Flood Warning | LOT | Lake, McHenry | 6 hr |
| Jun 26, 2:50 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Will | 40 min |
| Jun 26, 3:45 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 60 min |
| Jun 26, 11:08 AM CDT | Flash Flood Warning | LOT | Boone | 7 hr |
| Jun 26, 6:00 PM CDT | Flash Flood Warning | LOT | Boone | 12 hr |
| Jun 26, 4:05 AM CDT | Severe Thunderstorm Warning | LOT | Jasper, Porter | 70 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.