Alert archive / Indiana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 49, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 12, 1998, 3:43 PM CDT for Porter County, Indiana. It was in force for 32 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 12, 1998, 3:43 PM CDT (20:43 UTC)
- Expired
- Jun 12, 1998, 4:15 PM CDT
- In force
- 32 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
County Porter County, IN
The radar
The Chicago radar (KLOT), 85 km from the middle of the area, began a volume at 20:45 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 |
|---|---|---|---|
| Jun 12, 2:45 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 8.7 hours before the alert went out and 198 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
- 538 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 1016 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
269 WUUS1 KCHI 122045 RRA SVRCHI INC127-122115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE CHICAGO IL 343 PM CDT FRI JUN 12 1998 THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... PORTER COUNTY IN NORTHWEST INDIANA * UNTIL 415 PM CDT * AT 340 PM CDT A SEVERE THUNDERSTORM WAS INDICATED BY RADAR 5 MILES SOUTH OF VALPARAISO MOVING EAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL BE AFFECT... MALDEN A TORNADO WATCH IS IN EFFECT FOR THIS AREA. REMEMBER...SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. $$
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 12, 10:42 AM CDT, 5 hours 1 minute before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019- 131100- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO IL 1100 AM CDT/EST FRI JUN 12 1998 FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING SOUTH OF A CHICAGO...MARSEILLES LINE. SLIGHTLY DRIER AIR PUSHED INTO NORTHERN ILLINOIS OVERNIGHT...BUT THIS MORNING MOIST AIR IS SLOWLY RETURNING ON SOUTHWEST WINDS. A WEAK FRONTAL SYSTEM ASSOCIATED WITH AN UPPER LEVEL DISTURBANCE OVER THE UPPER MISSISSIPPI VALLEY WILL PUSH ACROSS THE AREA THIS AFTERNOON AND EVENING SETTING OFF SCATTERED THUNDERSTORMS. THE BEST CHANCE FOR SEVERE THUNDERSTORMS WILL BE SOOUTH OF A CHICAGO...MARSEILLES LINE WHERE THERE WILL BE MORE LOW LEVEL MOISTURE AVAILABLE. KAHN
Nearby
Severe 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.