Alert archive / Illinois / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 39, NWS Chicago, IL

April 19, 1996Boone County, McHenry County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at Apr 19, 1996, 10:08 PM CDT for Boone County, McHenry County, Illinois. It was in force for 37 min. 6 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: Apr 19, 1996, 10:08 PM CDT (03:08 UTC)
Expired: Apr 19, 1996, 10:45 PM CDT
In force: 37 min
Issued by: NWS Chicago, IL
Area: Whole counties

Counties Boone County, IL, McHenry County, IL

The radar

The Milwaukee radar (KMKX), 72 km from the middle of the area, began a volume at 03:11 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.

What was reported inside it

Time	Report	Where
Apr 19, 10:18 PM CDT	Thunderstorm Wind	Belvidere, IL
Apr 19, 10:24 PM CDT	Thunderstorm Wind	Belvidere, IL
Apr 19, 10:25 PM CDT	Thunderstorm Wind	Capron, IL
Apr 19, 10:30 PM CDT	Thunderstorm Wind	Garden Prairie, IL
Apr 19, 10:30 PM CDT	Thunderstorm Wind	Harvard, IL
Apr 19, 10:40 PM CDT	Thunderstorm Wind	Hebron, 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, 3.1 hours before the alert went out and 173 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 92 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1735 m above ground
0-6 km bulk shear: 89 kt
0-1 km storm-relative helicity: 497 m²/s²
0-3 km storm-relative helicity: 621 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.3

Open this sounding in Storm Lab

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, Apr 19, 4:22 PM CDT, 5 hours 46 minutes before

ILZ019-021-192230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
423 PM CDT FRI APR 19 1996

AT 417 PM A LINE OF STRONG THUNDERSTORMS WAS FROM LASALLE TO STREATOR
IN LASALLE COUNTY. PEA SIZE HAIL WAS REPORTED IN WENONA IN EXTREME
NORTHEAST MARSHALL COUNTY AS THE STORMS MOVED THROUGH. THESE STORMS
WERE MOVING NORTHEAST AT 35 MPH AND WILL AFFECT OTTAWA BY 425
PM...SENECA BY 445 PM AND BOTH MORRIS AND YORKVILLE BY 515 PM.

TRS

Special weather statement, Apr 19, 4:24 PM CDT, 5 hours 44 minutes before

ILZ019>021-192230-

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO IL
423 PM CDT FRI APR 19 1996

AT 417 PM A LINE OF STRONG THUNDERSTORMS WAS FROM LASALLE TO STREATOR
IN LASALLE COUNTY. PEA SIZE HAIL WAS REPORTED IN WENONA IN EXTREME
NORTHEAST MARSHALL COUNTY AS THE STORMS MOVED THROUGH. THESE STORMS
WERE MOVING NORTHEAST AT 35 MPH AND WILL AFFECT OTTAWA BY 425
PM...SENECA BY 445 PM AND BOTH MORRIS AND YORKVILLE BY 515 PM.

TRS
CORRECTED CODING

Special weather statement, Apr 19, 9:31 PM CDT, 37 minutes before

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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 19, 7:29 PM CDT	Tornado Warning	LOT	LaSalle, Livingston	31 min
Apr 19, 7:39 PM CDT	Tornado Warning	LOT	Kankakee	36 min
Apr 19, 8:05 PM CDT	Tornado Warning	LOT	LaSalle	40 min
Apr 19, 8:22 PM CDT	Tornado Warning	LOT	Grundy, Will	38 min
Apr 19, 9:16 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kendall, Will	29 min
Apr 19, 9:20 PM CDT	Severe Thunderstorm Warning	LOT	Ogle, Winnebago	25 min
Apr 19, 9:34 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	26 min
Apr 19, 9:34 PM CDT	Severe Thunderstorm Warning	LOT	Cook	26 min
Apr 19, 9:41 PM CDT	Severe Thunderstorm Warning	LOT	Ogle, Winnebago	34 min
Apr 19, 10:00 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Will	30 min
Apr 19, 10:00 PM CDT	Severe Thunderstorm Warning	LOT	Cook	30 min
Apr 19, 10:45 PM CDT	Severe Thunderstorm Warning	LOT	Lake, McHenry	30 min
Apr 19, 11:06 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	34 min
Apr 19, 11:19 PM CDT	Severe Thunderstorm Warning	LOT	Lake	26 min
Apr 19, 7:20 PM CDT	Tornado Warning	LOT	Lake, Newton	25 min
Apr 19, 7:40 PM CDT	Tornado Warning	LOT	Jasper, Porter	35 min
Apr 19, 8:19 PM CDT	Severe Thunderstorm Warning	LOT	LaPorte, Starke	26 min
Apr 19, 8:58 PM CDT	Tornado Warning	LOT	Marshall	32 min
Apr 19, 9:25 PM CDT	Tornado Warning	LOT	Elkhart, Kosciusko	35 min
Apr 19, 11:25 PM CDT	Severe Thunderstorm Warning	LOT	Lake, Porter	35 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1996 Every severe thunderstorm warning in 1996

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; radar from the NEXRAD Level II archive.