Alert archive / Illinois / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 263
The Storm Prediction Center issued this severe thunderstorm watch at May 8, 2002, 11:30 PM CDT for 18 counties in Illinois. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 8, 2002, 11:30 PM CDT (04:30 UTC)
- Expired
- May 9, 2002, 4:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties Champaign County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Iroquois County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, McLean County, IL, Menard County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Sangamon County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 12:02 AM CDT | Severe Thunderstorm Warning | ILX | Woodford | 43 min |
| May 9, 12:17 AM CDT | Flash Flood Warning | ILX | Marshall, Peoria, Tazewell, Woodford | 6 hr |
| May 9, 12:23 AM CDT | Severe Thunderstorm Warning | ILX | Christian, Macon, Shelby | 52 min |
| May 9, 2:04 AM CDT | Severe Thunderstorm Warning | ILX | Moultrie | 26 min |
| May 9, 2:27 AM CDT | Severe Thunderstorm Warning | ILX | Champaign, Coles, Douglas | 63 min |
| May 9, 2:52 AM CDT | Severe Thunderstorm Warning | ILX | Vermilion | 53 min |
| May 9, 3:14 AM CDT | Severe Thunderstorm Warning | ILX | Clark, Crawford, Edgar, Jasper | 61 min |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 4.5 hours before the alert went out and 46 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.
- Mixed-layer CAPE
- 1076 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 1020 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 175 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 9.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 090412 SEL3 SPC WW 090409 ILZ000-090900- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 263 STORM PREDICTION CENTER NORMAN OK 1109 PM CDT WED MAY 8 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EAST CENTRAL ILLINOIS EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1130 PM UNTIL 400 AM CDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 50 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH SOUTHWEST OF PEORIA ILLINOIS TO 10 MILES NORTH OF DANVILLE ILLINOIS. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. OTHER WATCH INFORMATION... CONTINUE...WW 259...WW 260...WW 261...WW 262... DISCUSSION...BOW ECHO NEAR SPI WILL LIKELY CONTINUE TRACKING EAST- NORTHEASTWARD AROUND 40 KNOTS...WITH ISOLATED CELLS DEVELOPING AHEAD OF FEATURE. DAMAGING WINDS WILL REMAIN LIKELY WITH APEX OF BOW FOR A FEW MORE HOURS. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 24035. ...HART 405,0895 410,0873 393,0873 393,0895 WWUS20 KWNS 090412 SEL3 SPC WW 090409 ILZ000-090900- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 263 STORM PREDICTION CENTER NORMAN OK 1109 PM CDT WED MAY 8 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EAST CENTRAL ILLINOIS EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1130 PM UNTIL 400 AM CDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 50 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH SOUTHWEST OF PEORIA ILLINOIS TO 10 MILES NORTH OF DANVILLE ILLINOIS. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. OTHER WATCH INFORMATION... CONTINUE...WW 259...WW 260...WW 261...WW 262... DISCUSSION...BOW ECHO NEAR SPI WILL LIKELY CONTINUE TRACKING EAST- NORTHEASTWARD AROUND 40 KNOTS...WITH ISOLATED CELLS DEVELOPING AHEAD OF FEATURE. DAMAGING WINDS WILL REMAIN LIKELY WITH APEX OF BOW FOR A FEW MORE HOURS. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 24035. ...HART 405,0895 410,0873 393,0873 393,0895
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 8:30 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 6 more | 6 hr |
| May 8, 9:00 PM CDT | Severe Thunderstorm Watch | SPC | Hancock, Henderson, Jo Daviess, McDonough, Mercer, Rock Island and 1 more | 5 hr |
| May 9, 2:30 AM CDT | Severe Thunderstorm Watch | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2002Every 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.