Alert archive / Indiana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 34, NWS Chicago, IL

July 8, 2001Iroquois County, Illinois; Benton County, Jasper County, Newton County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Jul 8, 2001, 4:03 PM CDT for Iroquois County, Illinois; Benton County, Jasper County, Newton County, Indiana. It was in force for 57 min. 2 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: Jul 8, 2001, 4:03 PM CDT (21:03 UTC)
Expired: Jul 8, 2001, 5:00 PM CDT
In force: 57 min
Issued by: NWS Chicago, IL
Area: Whole counties

Counties Iroquois County, IL, Benton County, IN, Jasper County, IN, Newton County, IN

The radar

The Chicago radar (KLOT), 103 km from the middle of the area, began a volume at 21:06 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	Remark
Jul 8, 4:16 PM CDT	Thunderstorm Wind 60 E	Enos, IN
Jul 8, 4:20 PM CDT	Thunderstorm Wind 60 E	Countywide, IN

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 8, 3:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.1 hours before the alert went out and 126 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: 1832 J/kg
Mixed-layer CIN: -166 J/kg
Mixed-layer LCL: 1274 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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.

NWS Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 8, 3:30 PM CDT, 33 minutes earlier.

Area forecast discussion, Jul 8, 3:30 PM CDT, 33 minutes before

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In the hours before

Special weather statement, Jul 8, 12:08 PM CDT, 3 hours 55 minutes before

ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019-
091100-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO IL
NOON PM CDT/EST SUN JUL 8 2001

FOR NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR IROQUOIS...FORD AND
LIVINGSTON COUNTIES IN ILLINOIS UNTIL 6 PM CDT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING SOUTH OF A LINE FROM DIXON ILLINOIS TO DE MOTTE INDIANA.

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS SOUTH OF A LINE
FROM MILFORD ILLINOIS TO STREATOR ILLINOIS.

A WARM FRONT LIES ACROSS CENTRAL ILLINOIS. ALONG THIS FRONT WARM AND
MOIST AIR IS POOLED RESULTING IN VERY UNSTABLE CONDITIONS.
THUNDERSTORMS WILL OCCUR THERE AND SOME OF THOSE THUNDERSTORMS COULD
BE SEVERE WITH HAIL...STRONG WINDS AND HEAVY RAINFALL.

WHW

Special weather statement, Jul 8, 3:29 PM CDT, 34 minutes before

ILZ033-039-082126-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
329 PM CDT SUN JUL 8 2001

AN AREA OF ACTIVE THUNDERSTORMS WILL BE MOVING EASTWARD ACROSS FORD
AND IROQUOIS COUNTIES DURING THE LATE AFTERNOON REACHING THE INDIANA
STATE LINE BY AROUND 430PM.

THESE STORMS MAY BE ACCOMPANIED BY GUSTY WINDS IN THE 40 TO 50 MPH
RANGE ALONG WITH LOCAL SMALL HAIL.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 2:18 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Livingston	27 min
Jul 8, 2:53 PM CDT	Severe Thunderstorm Warning	LOT	Livingston	37 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2001 Severe Thunderstorm Warnings in Illinois, 2001 Every severe thunderstorm warning in 2001

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.