Alert archive / Illinois / Tornado Watches in 1999

Tornado Watch 124

April 5, 199934 counties in Illinois; 9 counties in Kentucky; 28 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 5, 1999, 4:00 PM CDT for 34 counties in Illinois; 9 counties in Kentucky; 28 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 5, 1999, 4:00 PM CDT (21:00 UTC)
Expired
Apr 5, 1999, 10:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 71 counties

Adams County, IL, Alexander County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clinton County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Jackson County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Perry County, IL, Pike County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Scott County, IL, Union County, IL, Washington County, IL, Williamson County, IL, Ballard County, KY, Calloway County, KY, Carlisle County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Audrain County, MO, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Mississippi County, MO, Montgomery County, MO, New Madrid County, MO, Perry County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Shelby County, MO, Stoddard County, MO, Warren County, MO, Washington County, MO, Wayne County, MO

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 5, 4:17 PM CDTSevere Thunderstorm WarningLSXMadison48 min
Apr 5, 4:17 PM CDTSevere Thunderstorm WarningPAHBollinger, Wayne43 min
Apr 5, 4:46 PM CDTSevere Thunderstorm WarningPAHPerry29 min
Apr 5, 4:49 PM CDTSevere Thunderstorm WarningPAHScott, Stoddard41 min
Apr 5, 5:00 PM CDTSevere Thunderstorm WarningPAHNew Madrid30 min
Apr 5, 5:08 PM CDTSevere Thunderstorm WarningLSXRandolph32 min
Apr 5, 5:15 PM CDTSevere Thunderstorm WarningPAHCape Girardeau30 min
Apr 5, 5:18 PM CDTSevere Thunderstorm WarningPAHAlexander27 min
Apr 5, 5:26 PM CDTSevere Thunderstorm WarningPAHJackson, Union34 min
Apr 5, 5:27 PM CDTSevere Thunderstorm WarningPAHMississippi33 min
Apr 5, 5:31 PM CDTSevere Thunderstorm WarningPAHFulton, Hickman44 min
Apr 5, 5:50 PM CDTSevere Thunderstorm WarningPAHCarlisle30 min
Apr 5, 5:59 PM CDTSevere Thunderstorm WarningPAHBallard31 min
Apr 5, 6:03 PM CDTSevere Thunderstorm WarningPAHMcCracken42 min
Apr 5, 6:09 PM CDTSevere Thunderstorm WarningPAHGraves36 min
Apr 5, 6:15 PM CDTSevere Thunderstorm WarningPAHMassac45 min
Apr 5, 6:26 PM CDTTornado WarningLSXAdams49 min
Apr 5, 6:28 PM CDTSevere Thunderstorm WarningPAHPope47 min
Apr 5, 6:31 PM CDTTornado WarningPAHPope44 min
Apr 5, 7:00 PM CDTTornado WarningPAHGallatin, Hardin, Saline45 min
Apr 5, 7:59 PM CDTTornado WarningPAHButler31 min

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.0 hours before the alert went out and 203 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 1999-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1999-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1168 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
211 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.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 5, 6:30 PM CDTSevere Thunderstorm WatchSPCClark, Clay, Crawford, Cumberland, Edwards, Effingham and 9 more5 hr
Apr 5, 8:15 AM CDTTornado WatchSPCBarton, Bates, Cass, Clay, Jackson, Platte and 2 more6 hr
Apr 5, 1:45 PM CDTTornado WatchSPCBenton, Boone, Caldwell, Callaway, Camden, Carroll and 39 more5 hr
Apr 5, 2:30 PM CDTSevere Thunderstorm WatchSPCDunklin, Pemiscot6 hr
Apr 5, 5:00 PM CDTTornado WatchSPCAdair, Clark, Grundy, Knox, Lewis, Mercer and 4 more5 hr

Nearby

Tornado Watches in Illinois, 1999Tornado Watches in Missouri, 1999Tornado Watches in Kentucky, 1999Every tornado watch 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.