Alert archive / Illinois / Severe Thunderstorm Watches in 2000
Severe Thunderstorm Watch 657
The Storm Prediction Center issued this severe thunderstorm watch at Aug 7, 2000, 6:00 PM CDT for 51 counties in Illinois; 9 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 7, 2000, 6:00 PM CDT (23:00 UTC)
- Expired
- Aug 8, 2000, 12:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 60 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, Greene County, IL, Hamilton 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, 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, City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Lincoln County, MO, Pike County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO, Washington County, MO
The radar
The Lincoln radar (KILX), 97 km from the middle of the area, began a volume at 22:59 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
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 6:13 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Pike, Ralls | 47 min |
| Aug 7, 6:46 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Calhoun, Pike | 59 min |
| Aug 7, 6:46 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln | 59 min |
| Aug 7, 7:03 PM CDT | Severe Thunderstorm Warning | LSX | Warren | 57 min |
| Aug 7, 7:09 PM CDT | Severe Thunderstorm Warning | ILX | Scott | 51 min |
| Aug 7, 7:18 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 57 min |
| Aug 7, 7:18 PM CDT | Severe Thunderstorm Warning | LSX | Greene | 57 min |
| Aug 7, 7:56 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 49 min |
| Aug 7, 8:08 PM CDT | Severe Thunderstorm Warning | LSX | Saint Louis, City of Saint Louis | 52 min |
| Aug 7, 8:16 PM CDT | Severe Thunderstorm Warning | LSX | Warren | 44 min |
| Aug 7, 8:29 PM CDT | Severe Thunderstorm Warning | LSX | Franklin | 61 min |
| Aug 7, 8:46 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles | 44 min |
| Aug 7, 9:13 PM CDT | Severe Thunderstorm Warning | LSX | Saint Louis, City of Saint Louis | 47 min |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 11.0 hours before the alert went out and 134 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1267 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -40 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
068 WWUS9 KMKC 072243 SEL7 SEL7 MKC WW 072237 ILZ000-MOZ000-080500- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 657 STORM PREDICTION CENTER NORMAN OK 537 PM CDT MON AUG 7 2000 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF CENTRAL AND SOUTHERN ILLINOIS EAST CENTRAL MISSOURI EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 600 PM UNTIL MIDNIGHT 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 80 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST NORTHWEST OF SAINT LOUIS MISSOURI TO 40 MILES EAST SOUTHEAST OF MATTOON 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. OTHER WATCH INFORMATION... CONTINUE...WW 654...WW 655...WW 656... DISCUSSION...CONVECTIVE CLUSTER WITH A HISTORY OF WIND DAMAGE WILL MOVE EASTWARD INTO WATCH AREA AHEAD OF UPPER SHORT WAVE. COMBINATION OF VERY UNSTABLE AIR MASS AND MARGINAL WIND SHEAR INDICATES A CONTINUED THREAT OF DAMAGING DOWNDRAFTS AND LARGE HAIL. 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 25035. ...ROGASH 401,0911 402,0873 380,0873 375,0911
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 3:15 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Andrew, Audrain, Bates, Benton, Boone and 44 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2000Severe Thunderstorm Watches in Missouri, 2000Every severe thunderstorm watch in 2000
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.