Alert archive / Illinois / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 588
The Storm Prediction Center issued this severe thunderstorm watch at Jul 3, 2011, 1:15 PM CDT for 28 counties in Illinois; 20 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 3, 2011, 1:15 PM CDT (18:15 UTC)
- Expired
- Jul 3, 2011, 7:11 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 48 counties
Bond County, IL, Calhoun County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence 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, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Pike 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), 20 km from the middle of the area, began a volume at 18:15 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
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
30 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 1:18 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade | 42 min |
| Jul 3, 1:29 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Saint Charles, Saint Louis, Warren | 46 min |
| Jul 3, 1:29 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Washington | 46 min |
| Jul 3, 1:31 PM CDT | Severe Thunderstorm Warning | LSX | Randolph, Saint Clair, Washington | 44 min |
| Jul 3, 1:38 PM CDT | Severe Thunderstorm Warning | PAH | Jefferson | 37 min |
| Jul 3, 1:41 PM CDT | Severe Thunderstorm Warning | LSX | Boone | 49 min |
| Jul 3, 1:45 PM CDT | Severe Thunderstorm Warning | PAH | Jefferson, Wayne | 34 min |
| Jul 3, 1:54 PM CDT | Severe Thunderstorm Warning | LSX | Franklin | 51 min |
| Jul 3, 2:02 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway | 58 min |
| Jul 3, 2:12 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Charles, Saint Louis | 48 min |
| Jul 3, 2:13 PM CDT | Severe Thunderstorm Warning | PAH | Jefferson, Wayne | 28 min |
| Jul 3, 2:13 PM CDT | Severe Thunderstorm Warning | LSX | Franklin | 47 min |
| Jul 3, 2:16 PM CDT | Severe Thunderstorm Warning | LSX | Sainte Genevieve, Saint Francois | 44 min |
| Jul 3, 2:22 PM CDT | Severe Thunderstorm Warning | LSX | Saint Francois | 20 min |
| Jul 3, 2:23 PM CDT | Flash Flood Warning | PAH | Jefferson, Wayne | 2 hr |
| Jul 3, 2:24 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Warren | 51 min |
| Jul 3, 2:29 PM CDT | Severe Thunderstorm Warning | LSX | Cole, Osage | 46 min |
| Jul 3, 2:33 PM CDT | Severe Thunderstorm Warning | LSX | Callaway | 42 min |
| Jul 3, 2:34 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Saint Louis | 26 min |
| Jul 3, 2:39 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Monroe, Randolph, Saint Clair, Washington | 21 min |
| Jul 3, 2:50 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Saint Clair | 40 min |
| Jul 3, 2:51 PM CDT | Severe Thunderstorm Warning | LSX | Callaway, Osage | 24 min |
| Jul 3, 2:52 PM CDT | Severe Thunderstorm Warning | PAH | Hamilton | 23 min |
| Jul 3, 2:55 PM CDT | Severe Thunderstorm Warning | LSX | Callaway, Franklin, Gasconade, Montgomery, Warren | 35 min |
| Jul 3, 3:00 PM CDT | Severe Thunderstorm Warning | LSX | Clinton, Monroe, Randolph, Saint Clair, Washington | 45 min |
| Jul 3, 3:05 PM CDT | Severe Thunderstorm Warning | LSX | Callaway, Gasconade, Montgomery, Osage | 25 min |
| Jul 3, 3:11 PM CDT | Severe Thunderstorm Warning | PAH | White | 34 min |
| Jul 3, 3:26 PM CDT | Severe Thunderstorm Warning | LSX | Callaway, Franklin, Gasconade, Lincoln, Montgomery, Osage and 2 more | 64 min |
| Jul 3, 3:45 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton | 30 min |
| Jul 3, 3:56 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 49 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, 6.3 hours before the alert went out and 221 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
- 1911 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 884 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 12:26 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clay, Clinton, Effingham, Fayette and 11 more | 64 min |
| Jul 3, 3:35 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clark, Clay, Clinton, Crawford and 25 more | 55 min |
| Jul 3, 5:19 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clay, Clinton, Edwards, Fayette and 24 more | 26 min |
| Jul 2, 8:50 PM CDT | Mesoscale Discussion | SPC | Carroll, Clinton, Howard, Tippecanoe, Tipton | 55 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2011Severe Thunderstorm Watches in Missouri, 2011Every severe thunderstorm watch in 2011
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.