Alert archive / Illinois / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 53, NWS Chicago, IL

May 18, 1997Livingston County, Illinois

NWS Chicago, IL issued this severe thunderstorm warning at May 18, 1997, 8:52 PM CDT for Livingston County, Illinois. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 18, 1997, 8:52 PM CDT (01:52 UTC)
Expired
May 18, 1997, 11:00 PM CDT
In force
2 hr
Issued by
NWS Chicago, IL
Area
Whole counties

County Livingston County, IL

The radar

The Chicago radar (KLOT), 89 km from the middle of the area, began a volume at 01:55 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.

IssuedProductOfficeLasted
May 18, 5:30 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.9 hours before the alert went out and 83 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 1997-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1314 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 1997-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1314 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
1926 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
292 m²/s²
Significant tornado parameter
0.1
Supercell composite
8.8

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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 7:00 PM CDTTornado WarningLOTLake, McHenry60 min
May 18, 7:09 PM CDTSevere Thunderstorm WarningLOTKane66 min
May 18, 7:19 PM CDTSevere Thunderstorm WarningLOTLaSalle, Lee56 min
May 18, 7:30 PM CDTTornado WarningLOTKane30 min
May 18, 7:42 PM CDTSevere Thunderstorm WarningLOTKendall, LaSalle63 min
May 18, 7:47 PM CDTTornado WarningLOTDuPage, Will58 min
May 18, 8:04 PM CDTTornado WarningLOTGrundy, Kankakee, Will56 min
May 18, 8:04 PM CDTTornado WarningLOTCook56 min
May 18, 8:52 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Kankakee2 hr
May 18, 9:18 PM CDTTornado WarningLOTLaSalle57 min
May 18, 9:54 PM CDTSevere Thunderstorm WarningLOTGrundy, Livingston66 min
May 18, 10:50 PM CDTSevere Thunderstorm WarningLOTIroquois, Kankakee55 min
May 18, 11:12 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Livingston63 min
May 18, 8:15 PM CDTTornado WarningLOTLake, Porter60 min
May 18, 8:52 PM CDTSevere Thunderstorm WarningLOTJasper, LaPorte, Pulaski, Starke, White2 hr
May 18, 8:52 PM CDTSevere Thunderstorm WarningLOTMarshall, Saint Joseph2 hr
May 18, 9:19 PM CDTSevere Thunderstorm WarningLOTFulton, Kosciusko56 min
May 18, 9:19 PM CDTSevere Thunderstorm WarningLOTElkhart56 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1997Every severe thunderstorm warning in 1997

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.