Alert archive / Illinois / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 64, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 26, 1998, 3:45 AM CDT for Cook County, Will County, Illinois; Lake County, Indiana. It was in force for 60 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 26, 1998, 3:45 AM CDT (08:45 UTC)
- Expired
- Jun 26, 1998, 4:45 AM CDT
- In force
- 60 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Cook County, IL, Will County, IL, Lake County, IN
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 26, 3:52 AM CDT | Hail 2 | Hazel Crest, 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
Lincoln, IL (KILX), launched 00:00Z, 8.8 hours before the alert went out and 180 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
- 3027 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1569 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 13.9
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, 11:19 PM CDT, 4 hours 26 minutes before
ILZ003>006-008-260520- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 1119 PM CDT THU JUN 25 1998 ...SEVERE THUNDERSTORM WATCH CANCELED... SEVERE THUNDERSTORM WATCH NUMBER 670...WHICH WAS IN EFFECT UNTIL MIDNIGHT CDT FOR WINNEBAGO...BOONE...OGLE...MCHENRY AND LAKE COUNTIES IN NORTHERN ILLINOIS HAS BEEN CANCELED. THUNDERSTORMS WILL CONTINUE ACROSS THESE AREAS FOR THE NEXT FEW HOURS...HOWEVER THE THREAT OF SEVERE WEATHER HAS PASSED. RATZER
Special weather statement, Jun 25, 11:19 PM CDT, 4 hours 26 minutes before
ILZ003>006-008-260520- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 1119 PM CDT THU JUN 25 1998 ...SEVERE THUNDERSTORM WATCH CANCELED... SEVERE THUNDERSTORM WATCH NUMBER 670...WHICH WAS IN EFFECT UNTIL MIDNIGHT CDT FOR WINNEBAGO...BOONE...OGLE...MCHENRY AND LAKE COUNTIES IN NORTHERN ILLINOIS HAS BEEN CANCELED. THUNDERSTORMS WILL CONTINUE ACROSS THESE AREAS FOR THE NEXT FEW HOURS...HOWEVER THE THREAT OF SEVERE WEATHER HAS PASSED. RATZER
Special weather statement, Jun 25, 11:22 PM CDT, 4 hours 23 minutes before
ILZ005>006-012>014-020-022-INZ001-261200- HEAT WARNING NATIONAL WEATHER SERVICE CHICAGO IL 1122 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. COOL OUTFLOW FROM THUNDERSTORMS HAS DROPPED THE TEMPERATURE TO LOWER 70S IN MUCH OF THE NORTHERN AND CENTRAL PORTIONS OF THE METRO AREA...WHILE TEMPERATURES IN THE SOUTHWEST SUBURBS HOVER NEAR 85. ANY RELIEF SHOULD BE SHORT LIVED. IN FACT TEMPERATURES BY DAYBREAK MAY VERY WELL RISE AGAIN IN THOSE AREAS NOW GETTING RELIEF AND WE EXPECT TEMPERATURES WILL BE CLOSE TO 80 ACROSS MUCH 0F THE METRO AREA. HEAT INDICES FRIDAY WILL AGAIN CLIMB AS HIGH AS 105...FOR THE THIRD STRAIGHT DAY. PRESENTLY WE EXPECT SIMILAR CONDITIONS FRIDAY NIGHT AND SATURDAY SO THE WARNING MAY HAVE TO 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
Local storm report, Jun 25, 11:49 PM CDT, 3 hours 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1149 PM CDT THU JUN 25 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0838 PM DURAND IL TORNADO
06/25/98 WINNEBAGO BRIEF TOUCHDOWN
0924 PM WAUKEGAN MEM ARPT IL TORNADO
06/25/98 LAKE FUNNEL CLOUD ON GROUND 5
SOUTHWEST FROM PIREP
0946 PM CARY IL
06/25/98 MCHENRY UNCONFIRMED FUNNEL CLOUDThe 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 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, 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, 1998Severe Thunderstorm Warnings in Indiana, 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.