Alert archive / Illinois / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 677
The Storm Prediction Center issued this severe thunderstorm watch at Aug 18, 2001, 3:00 PM CDT for 27 counties in Illinois; Clay County, Sullivan County, Vigo County, Indiana; 25 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2001, 3:00 PM CDT (20:00 UTC)
- Expired
- Aug 18, 2001, 9:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 55 counties
Bond County, IL, Calhoun County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, Washington County, IL, Wayne County, IL, Clay County, IN, Sullivan County, IN, Vigo County, IN, Camden County, MO, City of Saint Louis, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Lincoln County, MO, Maries County, MO, Miller County, MO, Montgomery County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
Warnings issued inside it
27 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 3:30 PM CDT | Severe Thunderstorm Warning | ILX | Christian, Macon | 60 min |
| Aug 18, 4:02 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 28 min |
| Aug 18, 4:13 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Washington | 47 min |
| Aug 18, 4:16 PM CDT | Severe Thunderstorm Warning | ILX | Coles | 59 min |
| Aug 18, 4:24 PM CDT | Severe Thunderstorm Warning | ILX | Christian, Shelby | 81 min |
| Aug 18, 4:27 PM CDT | Severe Thunderstorm Warning | IND | Clay, Vigo | 33 min |
| Aug 18, 4:35 PM CDT | Severe Thunderstorm Warning | LSX | Fayette, Marion | 40 min |
| Aug 18, 5:02 PM CDT | Severe Thunderstorm Warning | LSX | Washington | 43 min |
| Aug 18, 5:03 PM CDT | Severe Thunderstorm Warning | IND | Clay, Owen, Putnam | 42 min |
| Aug 18, 5:11 PM CDT | Severe Thunderstorm Warning | SGF | Polk | 34 min |
| Aug 18, 5:15 PM CDT | Severe Thunderstorm Warning | ILX | Crawford | 60 min |
| Aug 18, 5:16 PM CDT | Severe Thunderstorm Warning | ILX | Coles, Cumberland | 59 min |
| Aug 18, 5:33 PM CDT | Severe Thunderstorm Warning | IND | Vigo | 27 min |
| Aug 18, 5:37 PM CDT | Severe Thunderstorm Warning | PAH | Jefferson | 53 min |
| Aug 18, 5:46 PM CDT | Severe Thunderstorm Warning | IND | Clay, Owen, Putnam | 44 min |
| Aug 18, 5:53 PM CDT | Severe Thunderstorm Warning | ILX | Effingham | 67 min |
| Aug 18, 5:53 PM CDT | Tornado Warning | PAH | Jefferson | 37 min |
| Aug 18, 5:56 PM CDT | Severe Thunderstorm Warning | IND | Knox, Sullivan | 34 min |
| Aug 18, 6:09 PM CDT | Severe Thunderstorm Warning | ILX | Jasper | 66 min |
| Aug 18, 6:30 PM CDT | Severe Thunderstorm Warning | ILX | Crawford | 60 min |
| Aug 18, 6:47 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Marion | 43 min |
| Aug 18, 6:59 PM CDT | Severe Thunderstorm Warning | LSX | Washington | 46 min |
| Aug 18, 7:18 PM CDT | Severe Thunderstorm Warning | PAH | Jefferson | 42 min |
| Aug 18, 7:29 PM CDT | Severe Thunderstorm Warning | LSX | Marion | 31 min |
| Aug 18, 7:51 PM CDT | Severe Thunderstorm Warning | PAH | Wayne | 54 min |
| Aug 18, 7:57 PM CDT | Severe Thunderstorm Warning | PAH | Jefferson | 63 min |
| Aug 18, 8:22 PM CDT | Severe Thunderstorm Warning | PAH | Perry | 38 min |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 8.0 hours before the alert went out and 273 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
- 192 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 1002 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 12:30 PM CDT | Tornado Watch | SPC | Champaign, Christian, DeWitt, Douglas, Edgar, Ford and 12 more | 6 hr |
| Aug 18, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | Crawford, Edwards, Franklin, Gallatin, Hamilton, Hardin and 7 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2001Severe Thunderstorm Watches in Missouri, 2001Severe Thunderstorm Watches in Indiana, 2001Every severe thunderstorm watch in 2001
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.