Alert archive / Illinois / Tornado Warnings in 1999

Tornado Warning 31, NWS Paducah, KY

May 5, 1999Williamson County, Illinois

NWS Paducah, KY issued this tornado warning at May 5, 1999, 2:39 PM CDT for Williamson County, Illinois. It was in force for 51 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
May 5, 1999, 2:39 PM CDT (19:39 UTC)
Expired
May 5, 1999, 3:30 PM CDT
In force
51 min
Issued by
NWS Paducah, KY
Area
Whole counties

County Williamson County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.7 hours before the alert went out and 271 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 12:00Z on 1999-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 49 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 12:00Z on 1999-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 208 square meters per square second.1939587897Sfc1 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
49 J/kg
Mixed-layer CIN
-201 J/kg
Mixed-layer LCL
869 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
208 m²/s²
0-3 km storm-relative helicity
200 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Paducah, KY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 4, 9:10 PM CDTSevere Thunderstorm WarningPAHHickman20 min
May 5, 4:03 PM CDTSevere Thunderstorm WarningPAHBallard, Carlisle, McCracken57 min
May 5, 4:18 PM CDTSevere Thunderstorm WarningPAHHickman27 min
May 5, 5:41 PM CDTSevere Thunderstorm WarningPAHCalloway, Trigg49 min
May 5, 6:02 PM CDTSevere Thunderstorm WarningPAHWebster28 min
May 5, 6:17 PM CDTSevere Thunderstorm WarningPAHDaviess, Henderson, McLean43 min
May 5, 6:24 PM CDTSevere Thunderstorm WarningPAHChristian51 min
May 5, 6:57 PM CDTSevere Thunderstorm WarningPAHDaviess33 min
May 5, 1:40 PM CDTSevere Thunderstorm WarningPAHJefferson35 min
May 5, 2:14 PM CDTSevere Thunderstorm WarningPAHWayne16 min
May 5, 2:25 PM CDTSevere Thunderstorm WarningPAHJohnson, Williamson35 min
May 5, 2:30 PM CDTSevere Thunderstorm WarningPAHWayne15 min
May 5, 3:02 PM CDTSevere Thunderstorm WarningPAHSaline43 min
May 4, 8:30 PM CDTSevere Thunderstorm WarningPAHStoddard30 min
May 5, 4:43 PM CDTSevere Thunderstorm WarningPAHButler, Wayne32 min

Nearby

Tornado Warnings in Illinois, 1999Every tornado warning in 1999Tornadoes in 1999

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.