Alert archive / Illinois / Severe Thunderstorm Watches in 2014
Severe Thunderstorm Watch 10
The Storm Prediction Center issued this severe thunderstorm watch at Feb 20, 2014, 1:36 PM CST for 21 counties in Illinois; 18 counties in Missouri. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 20, 2014, 1:36 PM CST (19:36 UTC)
- Expired
- Feb 20, 2014, 5:17 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 39 counties
Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Christian County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Washington County, IL, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 48 km from the middle of the area, began a volume at 19:36 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 1:44 PM CST | Severe Thunderstorm Warning | LSX | Adams, Pike | 46 min |
| Feb 20, 2:20 PM CST | Severe Thunderstorm Warning | ILX | Cass, Mason, Menard, Morgan, Sangamon, Schuyler and 1 more | 40 min |
| Feb 20, 2:25 PM CST | Severe Thunderstorm Warning | LSX | Adams, Brown, Pike | 35 min |
| Feb 20, 2:49 PM CST | Tornado Warning | ILX | Cass, Mason, Morgan, Scott | 26 min |
| Feb 20, 2:58 PM CST | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin, Montgomery | 47 min |
| Feb 20, 3:25 PM CST | Severe Thunderstorm Warning | LSX | Bond, Macoupin, Madison | 50 min |
| Feb 20, 3:29 PM CST | Severe Thunderstorm Warning | ILX | Christian, Sangamon | 31 min |
| Feb 20, 3:42 PM CST | Severe Thunderstorm Warning | LSX | Macoupin, Montgomery | 48 min |
| Feb 20, 3:49 PM CST | Tornado Warning | ILX | Christian, Sangamon | 26 min |
| Feb 20, 3:55 PM CST | Severe Thunderstorm Warning | LSX | Bond, Fayette | 50 min |
| Feb 20, 4:01 PM CST | Severe Thunderstorm Warning | ILX | Christian, Coles, Douglas, Macon, Moultrie, Piatt and 1 more | 59 min |
| Feb 20, 4:01 PM CST | Severe Thunderstorm Warning | LSX | Clinton, Madison, Saint Clair | 44 min |
| Feb 20, 4:08 PM CST | Tornado Warning | ILX | DeWitt, Logan, Macon, Sangamon | 22 min |
| Feb 20, 4:09 PM CST | Flash Flood Warning | ILX | Sangamon | 5 hr |
| Feb 20, 4:10 PM CST | Tornado Warning | LSX | Fayette, Montgomery | 20 min |
| Feb 20, 4:11 PM CST | Tornado Warning | ILX | Christian, Shelby | 34 min |
| Feb 20, 4:23 PM CST | Severe Thunderstorm Warning | LSX | Fayette | 52 min |
| Feb 20, 4:35 PM CST | Severe Thunderstorm Warning | LSX | Clinton, Marion, Randolph, Washington | 40 min |
| Feb 20, 4:40 PM CST | Tornado Warning | LSX | Fayette | 35 min |
| Feb 20, 5:09 PM CST | Severe Thunderstorm Warning | LSX | Clinton, Fayette, Marion, Washington | 51 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 7.6 hours before the alert went out and 210 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
- 507 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 582 m²/s²
- 0-3 km storm-relative helicity
- 576 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 11:34 AM CST | Mesoscale Discussion | SPC | Brown, Calhoun, Cass, Greene, Jersey, Macoupin and 3 more | 116 min |
| Feb 20, 1:45 PM CST | Mesoscale Discussion | SPC | Alexander, Gallatin, Hardin, Johnson, Massac, Pope and 5 more | 2 hr |
| Feb 20, 2:23 PM CST | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 hr |
| Feb 20, 3:23 PM CST | Mesoscale Discussion | SPC | Bond, Calhoun, Christian, Clark, Clay, Clinton and 25 more | 97 min |
| Feb 20, 3:50 PM CST | Severe Thunderstorm Watch | SPC | Clark, Clay, Coles, Crawford, Cumberland, DeWitt and 11 more | 56 min |
| Feb 20, 4:45 PM CST | Tornado Watch | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 12 more | 3 hr |
| Feb 20, 5:29 PM CST | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more | 46 min |
| Feb 20, 2:43 AM CST | Mesoscale Discussion | SPC | Benton, Camden, Cedar, Cole, Crawford, Dade and 29 more | 3 hr |
| Feb 20, 4:24 AM CST | Mesoscale Discussion | SPC | Andrew, Buchanan, Caldwell, Clay, Clinton, Daviess and 11 more | 2 hr |
| Feb 20, 10:20 AM CST | Mesoscale Discussion | SPC | Adair, Clark, Daviess, Gentry, Grundy, Harrison and 7 more | 85 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2014Severe Thunderstorm Watches in Missouri, 2014Every severe thunderstorm watch in 2014
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.