Alert archive / Illinois / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 34
The Storm Prediction Center issued this severe thunderstorm watch at Apr 8, 2015, 1:05 PM CDT for 48 counties in Illinois; 47 counties in Indiana; 16 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 8, 2015, 1:05 PM CDT (18:05 UTC)
- Expired
- Apr 8, 2015, 6:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 111 counties
Bond County, IL, Calhoun 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, Franklin 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, McLean 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, Scott County, IL, Shelby County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clark County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Decatur County, IN, Dubois County, IN, Floyd County, IN, Fountain County, IN, Gibson County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Tippecanoe County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Warrick County, IN, Washington County, IN, Callaway County, MO, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln 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 Lincoln radar (KILX), 94 km from the middle of the area, began a volume at 18:08 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
- 10%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
53 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 1:07 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Greene, Jersey, Macoupin, Madison | 38 min |
| Apr 8, 1:11 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade, Montgomery, Osage, Warren | 34 min |
| Apr 8, 1:13 PM CDT | Severe Thunderstorm Warning | LSX | Marion | 28 min |
| Apr 8, 1:27 PM CDT | Severe Thunderstorm Warning | ILX | Clay | 31 min |
| Apr 8, 1:33 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade | 27 min |
| Apr 8, 1:43 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade, Warren, Washington | 47 min |
| Apr 8, 1:48 PM CDT | Severe Thunderstorm Warning | ILX | Lawrence, Richland | 42 min |
| Apr 8, 2:03 PM CDT | Severe Thunderstorm Warning | PAH | Wayne | 27 min |
| Apr 8, 2:23 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade | 52 min |
| Apr 8, 2:25 PM CDT | Severe Thunderstorm Warning | ILX | Lawrence, Richland | 35 min |
| Apr 8, 2:26 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Jefferson, Washington | 49 min |
| Apr 8, 2:30 PM CDT | Severe Thunderstorm Warning | ILX | Champaign, McLean | 26 min |
| Apr 8, 2:35 PM CDT | Severe Thunderstorm Warning | IND | Knox | 40 min |
| Apr 8, 2:42 PM CDT | Severe Thunderstorm Warning | PAH | Edwards | 33 min |
| Apr 8, 2:48 PM CDT | Severe Thunderstorm Warning | IND | Brown, Monroe, Morgan, Owen | 42 min |
| Apr 8, 3:00 PM CDT | Severe Thunderstorm Warning | PAH | Wabash | 30 min |
| Apr 8, 3:01 PM CDT | Severe Thunderstorm Warning | ILX | Lawrence, Richland | 17 min |
| Apr 8, 3:05 PM CDT | Severe Thunderstorm Warning | LSX | Crawford, Franklin, Gasconade, Iron, Jefferson, Washington | 55 min |
| Apr 8, 3:07 PM CDT | Tornado Warning | LSX | Crawford, Washington | 23 min |
| Apr 8, 3:10 PM CDT | Tornado Warning | IND | Brown, Monroe | 35 min |
| Apr 8, 3:16 PM CDT | Severe Thunderstorm Warning | IND | Daviess, Knox | 44 min |
| Apr 8, 3:20 PM CDT | Tornado Warning | LSX | Jefferson, Saint Francois, Washington | 25 min |
| Apr 8, 3:25 PM CDT | Flash Flood Warning | IND | Daviess, Knox | 6 hr |
| Apr 8, 3:27 PM CDT | Severe Thunderstorm Warning | IND | Johnson, Monroe, Morgan | 33 min |
| Apr 8, 3:28 PM CDT | Severe Thunderstorm Warning | IND | Boone, Clinton, Montgomery | 32 min |
| Apr 8, 3:40 PM CDT | Tornado Warning | LSX | Jefferson, Sainte Genevieve, Saint Francois, Washington | 35 min |
| Apr 8, 3:41 PM CDT | Severe Thunderstorm Warning | ILX | Lawrence | 31 min |
| Apr 8, 3:45 PM CDT | Severe Thunderstorm Warning | LMK | Dubois | 40 min |
| Apr 8, 3:47 PM CDT | Severe Thunderstorm Warning | IND | Bartholomew, Brown, Johnson | 28 min |
| Apr 8, 3:51 PM CDT | Tornado Warning | IND | Daviess, Martin | 24 min |
| Apr 8, 3:58 PM CDT | Severe Thunderstorm Warning | IND | Johnson, Marion, Shelby | 32 min |
| Apr 8, 3:59 PM CDT | Tornado Warning | LSX | Sainte Genevieve, Saint Francois | 31 min |
| Apr 8, 4:05 PM CDT | Flash Flood Warning | ILX | Lawrence, Richland | 6 hr |
| Apr 8, 4:06 PM CDT | Severe Thunderstorm Warning | IND | Knox | 22 min |
| Apr 8, 4:10 PM CDT | Severe Thunderstorm Warning | IND | Carroll, Clinton, Howard, Montgomery, Tippecanoe, Tipton | 35 min |
| Apr 8, 4:13 PM CDT | Severe Thunderstorm Warning | IND | Daviess, Lawrence, Martin | 31 min |
| Apr 8, 4:17 PM CDT | Severe Thunderstorm Warning | LMK | Orange | 38 min |
| Apr 8, 4:19 PM CDT | Severe Thunderstorm Warning | LMK | Clark, Scott, Washington | 31 min |
| Apr 8, 4:24 PM CDT | Severe Thunderstorm Warning | IND | Hancock, Marion, Shelby | 36 min |
| Apr 8, 4:26 PM CDT | Tornado Warning | LSX | Sainte Genevieve, Saint Francois | 34 min |
| Apr 8, 4:36 PM CDT | Flash Flood Warning | IND | Boone, Montgomery, Tippecanoe | 6 hr |
| Apr 8, 4:38 PM CDT | Severe Thunderstorm Warning | LMK | Washington | 32 min |
| Apr 8, 4:53 PM CDT | Tornado Warning | LSX | Sainte Genevieve, Saint Francois | 37 min |
| Apr 8, 4:57 PM CDT | Flash Flood Warning | LSX | Sainte Genevieve, Saint Francois, Washington | 4 hr |
| Apr 8, 4:58 PM CDT | Severe Thunderstorm Warning | LMK | Clark, Jefferson, Scott | 32 min |
| Apr 8, 5:05 PM CDT | Tornado Warning | LSX | Madison, Sainte Genevieve, Saint Francois | 25 min |
| Apr 8, 5:12 PM CDT | Flash Flood Warning | LMK | Jefferson, Scott, Washington | 2 hr |
| Apr 8, 5:15 PM CDT | Severe Thunderstorm Warning | LMK | Jefferson, Scott | 30 min |
| Apr 8, 5:25 PM CDT | Severe Thunderstorm Warning | LSX | Sainte Genevieve, Saint Francois, Washington | 22 min |
| Apr 8, 5:28 PM CDT | Severe Thunderstorm Warning | LMK | Jefferson | 32 min |
| Apr 8, 5:28 PM CDT | Severe Thunderstorm Warning | LSX | Madison, Sainte Genevieve, Saint Francois | 47 min |
| Apr 8, 5:46 PM CDT | Severe Thunderstorm Warning | LMK | Jefferson | 29 min |
| Apr 8, 5:50 PM CDT | Flash Flood Warning | LSX | Sainte Genevieve, Saint Francois | 3 hr |
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, 6.1 hours before the alert went out and 92 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
- 195 J/kg
- Mixed-layer CIN
- -238 J/kg
- Mixed-layer LCL
- 839 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 7:41 AM CDT | Mesoscale Discussion | SPC | Clark, Coles, Cumberland | 64 min |
| Apr 8, 12:01 PM CDT | Mesoscale Discussion | SPC | Jackson, Monroe, Perry, Randolph, Saint Clair, Washington | 59 min |
| Apr 8, 12:50 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Champaign, Christian, Clark, Clay and 32 more | 85 min |
| Apr 8, 2:43 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 45 more | 92 min |
| Apr 8, 3:42 PM CDT | Mesoscale Discussion | SPC | Franklin, Gallatin, Hamilton, Jackson, Jefferson, Monroe and 7 more | 63 min |
| Apr 8, 4:07 PM CDT | Tornado Watch | SPC | Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more | 4 hr |
| Apr 8, 9:16 AM CDT | Mesoscale Discussion | SPC | Clark, Dearborn, Jefferson, Jennings, Ohio, Ripley and 2 more | 119 min |
| Apr 8, 9:34 AM CDT | Severe Thunderstorm Watch | SPC | Dearborn, Franklin, Jefferson, Ohio, Ripley, Switzerland | 5 hr |
| Apr 7, 8:24 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Cass, Cedar, Cooper and 13 more | 5 hr |
| Apr 7, 10:13 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Cass, Cedar, Henry and 6 more | 2 hr |
| Apr 8, 6:17 AM CDT | Mesoscale Discussion | SPC | Bates, Benton, Boone, Callaway, Camden, Cass and 19 more | 88 min |
| Apr 8, 6:39 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Audrain, Barton, Bates, Benton, Boone and 54 more | 6 hr |
| Apr 8, 9:33 AM CDT | Mesoscale Discussion | SPC | Adair, Audrain, Benton, Boone, Caldwell, Callaway and 45 more | 57 min |
| Apr 8, 2:21 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cass and 16 more | 114 min |
| Apr 8, 2:47 PM CDT | Severe Thunderstorm Watch | SPC | Barry, Barton, Bates, Benton, Camden, Cass and 29 more | 4 hr |
| Apr 8, 5:45 PM CDT | Mesoscale Discussion | SPC | Audrain, Bates, Benton, Boone, Caldwell, Callaway and 39 more | 60 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2015Severe Thunderstorm Watches in Indiana, 2015Severe Thunderstorm Watches in Missouri, 2015Every severe thunderstorm watch in 2015
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.