Alert archive / Illinois / Severe Thunderstorm Watches in 1998

Severe Thunderstorm Watch 375

May 19, 199816 counties in Illinois; Gibson County, Indiana

The Storm Prediction Center issued this severe thunderstorm watch at May 19, 1998, 9:00 PM CDT for 16 counties in Illinois; Gibson County, Indiana. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 19, 1998, 9:00 PM CDT (02:00 UTC)
Expired
May 20, 1998, 2:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Marion County, IL, Richland County, IL, Shelby County, IL, Wabash County, IL, Wayne County, IL, Gibson County, IN

Warnings issued inside it

3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 19, 9:12 PM CDTSevere Thunderstorm WarningILXClark, Edgar48 min
May 19, 9:56 PM CDTSevere Thunderstorm WarningILXClay, Effingham, Jasper49 min
May 19, 10:10 PM CDTSevere Thunderstorm WarningILXRichland35 min

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.0 hours before the alert went out and 125 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 1998-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4287 joules per kilogram.LCLEL10008507005003002001001 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 1998-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 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
4287 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1245 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
41 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

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.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 1:15 PM CDTSevere Thunderstorm WatchSPCCrawford, Edwards, Gallatin, Hardin, Johnson, Lawrence and 6 more6 hr
May 19, 7:30 PM CDTSevere Thunderstorm WatchSPCBartholomew, Brown, Clark, Clay, Crawford, Daviess and 23 more5 hr
May 20, 4:00 PM CDTSevere Thunderstorm WatchSPCClark, Floyd, Jefferson, Scott5 hr

Nearby

Severe Thunderstorm Watches in Illinois, 1998Severe Thunderstorm Watches in Indiana, 1998Every severe thunderstorm watch 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.