Alert archive / Illinois / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 194

May 1, 20024 states

The Storm Prediction Center issued this severe thunderstorm watch at May 1, 2002, 12:45 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2002, 12:45 PM CDT (17:45 UTC)
Expired: May 1, 2002, 6:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 116 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass 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, Franklin County, IL, Fulton County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Hancock County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pike County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Clay County, IN, Daviess County, IN, Dubois County, IN, Fountain County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Martin County, IN, Montgomery County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warrick County, IN, Daviess County, KY, Hancock County, KY, Henderson County, KY, Adair County, MO, Audrain County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, City of Saint Louis, MO, Clark County, MO, Cole County, MO, Cooper County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Macon County, MO, Maries County, MO, Marion County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 86 km from the middle of the area, began a volume at 17:45 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 1, 1:11 PM CDT	Severe Thunderstorm Warning	ILX	Schuyler	49 min
May 1, 1:25 PM CDT	Flash Flood Warning	ILX	Christian	6 hr
May 1, 1:33 PM CDT	Tornado Warning	LSX	Bond	42 min
May 1, 1:39 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Mason	51 min
May 1, 1:51 PM CDT	Severe Thunderstorm Warning	ILX	Scott	24 min
May 1, 1:56 PM CDT	Tornado Warning	LSX	Marion	49 min
May 1, 2:04 PM CDT	Severe Thunderstorm Warning	ILX	Effingham	56 min
May 1, 2:06 PM CDT	Severe Thunderstorm Warning	ILX	Menard	39 min
May 1, 2:09 PM CDT	Tornado Warning	ILX	Clay	66 min
May 1, 2:10 PM CDT	Tornado Warning	ILX	Clay	65 min
May 1, 2:25 PM CDT	Flash Flood Warning	ILX	Morgan, Sangamon, Scott	6 hr
May 1, 2:30 PM CDT	Severe Thunderstorm Warning	ILX	Morgan	45 min
May 1, 2:37 PM CDT	Tornado Warning	ILX	Richland	38 min
May 1, 2:42 PM CDT	Severe Thunderstorm Warning	ILX	Sangamon	48 min
May 1, 2:44 PM CDT	Tornado Warning	PAH	Wayne	46 min
May 1, 2:54 PM CDT	Tornado Warning	LSX	Macoupin, Montgomery	21 min
May 1, 3:05 PM CDT	Tornado Warning	ILX	Lawrence	40 min
May 1, 3:05 PM CDT	Tornado Warning	PAH	Edwards, Wabash	40 min
May 1, 3:10 PM CDT	Tornado Warning	ILX	Christian	50 min
May 1, 3:17 PM CDT	Tornado Warning	IND	Knox	28 min
May 1, 3:18 PM CDT	Severe Thunderstorm Warning	ILX	Richland	42 min
May 1, 3:23 PM CDT	Tornado Warning	PAH	Gibson	52 min
May 1, 3:36 PM CDT	Tornado Warning	ILX	Shelby	54 min
May 1, 3:43 PM CDT	Tornado Warning	PAH	Wabash	17 min
May 1, 3:45 PM CDT	Tornado Warning	PAH	Pike	60 min
May 1, 3:47 PM CDT	Severe Thunderstorm Warning	IND	Daviess, Knox	28 min
May 1, 4:00 PM CDT	Flash Flood Warning	ILX	Shelby	6 hr
May 1, 4:00 PM CDT	Severe Thunderstorm Warning	LMK	Dubois	45 min
May 1, 4:20 PM CDT	Tornado Warning	LMK	Dubois	30 min
May 1, 4:21 PM CDT	Tornado Warning	ILX	Cumberland	54 min
May 1, 4:34 PM CDT	Severe Thunderstorm Warning	PAH	Spencer	26 min
May 1, 5:04 PM CDT	Severe Thunderstorm Warning	ILX	Crawford	56 min
May 1, 5:21 PM CDT	Severe Thunderstorm Warning	IND	Sullivan	24 min
May 1, 5:35 PM CDT	Flash Flood Warning	IND	Greene, Sullivan	55 min
May 1, 5:36 PM CDT	Flash Flood Warning	IND	Greene, Sullivan	114 min
May 1, 5:36 PM CDT	Severe Thunderstorm Warning	IND	Greene	24 min
May 1, 5:51 PM CDT	Severe Thunderstorm Warning	IND	Daviess, Knox, Martin	24 min
May 1, 5:57 PM CDT	Severe Thunderstorm Warning	IND	Greene, Lawrence	33 min

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 5.8 hours before the alert went out and 172 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1126 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 327 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 1, 9:45 AM CDT	Severe Thunderstorm Watch	SPC	Alexander, Franklin, Jackson, Johnson, Massac, Perry and 6 more	6 hr
May 1, 2:30 PM CDT	Tornado Watch	SPC	Bond, Champaign, Christian, Clark, Clay, Clinton and 39 more	4 hr
May 1, 3:45 PM CDT	Tornado Watch	SPC	Bartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 20 more	5 hr

Nearby

Severe Thunderstorm Watches in Illinois, 2002 Severe Thunderstorm Watches in Missouri, 2002 Severe Thunderstorm Watches in Indiana, 2002 Every severe thunderstorm watch in 2002

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.