Alert archive / Illinois / Tornado Warnings in 1998
Tornado Warning 11, NWS Chicago, IL
NWS Chicago, IL issued this tornado warning at Jun 25, 1998, 9:26 PM CDT for McHenry County, Illinois. It was in force for 34 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
- Jun 25, 1998, 9:26 PM CDT (02:26 UTC)
- Expired
- Jun 25, 1998, 10:00 PM CDT
- In force
- 34 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
County McHenry County, IL
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 25, 7:30 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.4 hours before the alert went out and 187 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
As transmitted, in the capitals the NWS used until 2016.
263 WFUS1 KCHI 260231 RRA TORCHI ILC111-260326- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE CHICAGO IL 926 PM CDT THU JUN 25 1998 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * TORNADO WARNING FOR... WESTERN MCHENRY COUNTY IN NORTHEAST ILLINOIS * UNTIL 1000 PM CDT * AT 925 PM CDT A POSSIBLE TORNADO WAS INDICATED BY RADAR NEAR POPLAR GROVE OR ABOUT 20 MILES WEST OF WOODSTOCK. * THIS STORM WILL BE NEAR HARVARD BY 940 PM. GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR $$
What forecasters said that day
The local office's own words before this tornado 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, 5 hours 11 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, 5 hours 11 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, 8:59 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 56 min |
| Jun 25, 9:14 PM CDT | Tornado Warning | LOT | Lake, McHenry | 31 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 |
Nearby
Tornado Warnings in Illinois, 1998Every tornado warning in 1998Tornadoes 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; the sounding from the Mesonet's radiosonde archive.