Alert archive / Illinois / Tornado Watches in 1999

Tornado Watch 48

February 11, 19994 states

The Storm Prediction Center issued this tornado watch at Feb 11, 1999, 2:30 PM CST for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Feb 11, 1999, 2:30 PM CST (20:30 UTC)
Expired
Feb 11, 1999, 8:00 PM CST
In force
6 hr
Issued by
the Storm Prediction Center
All 106 counties

Alexander County, IL, Bond County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Franklin County, IL, Gallatin County, IL, Grundy County, IL, Hamilton County, IL, Hardin County, IL, Iroquois County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Kankakee County, IL, LaSalle County, IL, Lawrence County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Madison County, IL, Marion County, IL, Massac County, IL, McLean County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Shelby County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Will County, IL, Williamson County, IL, Woodford County, IL, Benton County, IN, Carroll County, IN, Clay County, IN, Fountain County, IN, Gibson County, IN, Jasper County, IN, Knox County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Porter County, IN, Posey County, IN, Pulaski County, IN, Starke County, IN, Sullivan County, IN, Tippecanoe County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, White County, IN, Ballard County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Union County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Feb 11, 2:47 PM CSTSevere Thunderstorm WarningLSXMadison48 min
Feb 11, 3:34 PM CSTSevere Thunderstorm WarningLOTGrundy, Kankakee, Will26 min
Feb 11, 3:39 PM CSTSevere Thunderstorm WarningPAHBollinger21 min
Feb 11, 3:53 PM CSTTornado WarningILXWoodford37 min
Feb 11, 3:57 PM CSTSevere Thunderstorm WarningPAHPerry18 min
Feb 11, 4:12 PM CSTSevere Thunderstorm WarningINDFountain, Vermillion48 min
Feb 11, 4:15 PM CSTSevere Thunderstorm WarningPAHStoddard30 min
Feb 11, 4:24 PM CSTSevere Thunderstorm WarningLSXFayette51 min
Feb 11, 4:37 PM CSTSevere Thunderstorm WarningLSXMarion48 min
Feb 11, 4:51 PM CSTSevere Thunderstorm WarningILXChampaign39 min
Feb 11, 5:05 PM CSTSevere Thunderstorm WarningPAHFranklin25 min
Feb 11, 5:10 PM CSTSevere Thunderstorm WarningPAHAlexander35 min
Feb 11, 5:13 PM CSTSevere Thunderstorm WarningPAHPulaski32 min
Feb 11, 5:16 PM CSTSevere Thunderstorm WarningPAHUnion29 min
Feb 11, 5:17 PM CSTSevere Thunderstorm WarningILXClay28 min
Feb 11, 5:18 PM CSTSevere Thunderstorm WarningPAHJohnson, Williamson42 min
Feb 11, 5:27 PM CSTSevere Thunderstorm WarningILXClark, Edgar33 min
Feb 11, 6:46 PM CSTSevere Thunderstorm WarningIWXLaPorte29 min

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.5 hours before the alert went out and 184 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 1999-02-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 394 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 1999-02-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 293 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
394 J/kg
Mixed-layer CIN
-231 J/kg
Mixed-layer LCL
746 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
293 m²/s²
0-3 km storm-relative helicity
310 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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
Feb 11, 11:15 AM CSTSevere Thunderstorm WatchSPCAdams, Brown, Bureau, Calhoun, Cass, Fulton and 26 more7 hr
Feb 11, 1:00 PM CSTSevere Thunderstorm WatchSPCBoone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 8 more5 hr
Feb 11, 3:30 PM CSTSevere Thunderstorm WatchSPCFulton6 hr
Feb 11, 7:15 AM CSTSevere Thunderstorm WatchSPCBarry, Barton, Bates, Benton, Buchanan, Caldwell and 28 more6 hr

Nearby

Tornado Watches in Illinois, 1999Tornado Watches in Indiana, 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.