Alert archive / Illinois / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 353
The Storm Prediction Center issued this severe thunderstorm watch at Jun 4, 2012, 3:25 PM CDT for 5 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 4, 2012, 3:25 PM CDT (20:25 UTC)
- Expired
- Jun 4, 2012, 10:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 93 counties
Alexander County, IL, Bond County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Montgomery County, IL, Perry County, IL, Pike County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Posey County, IN, Vanderburgh County, IN, Allen County, KY, Ballard County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Warren County, KY, Webster County, KY, Bollinger County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Franklin County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Mississippi County, MO, Perry County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Warren County, MO, Benton County, TN, Cheatham County, TN, Davidson County, TN, Dickson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Montgomery County, TN, Obion County, TN, Robertson County, TN, Stewart County, TN, Sumner County, TN, Weakley County, TN, Wilson County, TN
The radar
The Paducah radar (KPAH), 128 km from the middle of the area, began a volume at 20:23 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
- 80%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 3:33 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun | 42 min |
| Jun 4, 4:08 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Saint Charles, Saint Louis | 37 min |
| Jun 4, 4:38 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 52 min |
| Jun 4, 5:20 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 17 min |
| Jun 4, 8:02 PM CDT | Severe Thunderstorm Warning | PAH | Alexander | 28 min |
| Jun 4, 8:19 PM CDT | Severe Thunderstorm Warning | PAH | Scott | 41 min |
| Jun 4, 8:33 PM CDT | Severe Thunderstorm Warning | PAH | Massac, Pulaski | 42 min |
| Jun 4, 8:43 PM CDT | Tornado Warning | PAH | Mississippi, Scott | 17 min |
| Jun 4, 8:57 PM CDT | Severe Thunderstorm Warning | PAH | Mississippi, New Madrid, Scott | 33 min |
| Jun 4, 9:06 PM CDT | Severe Thunderstorm Warning | PAH | Massac, Pope | 39 min |
| Jun 4, 9:30 PM CDT | Severe Thunderstorm Warning | PAH | Mississippi, New Madrid, Scott | 30 min |
| Jun 4, 9:46 PM CDT | Severe Thunderstorm Warning | PAH | Calloway, Lyon, Marshall, Trigg | 25 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, 8.4 hours before the alert went out and 228 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
- 1375 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 231 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 |
|---|---|---|---|---|
| Jun 4, 2:38 PM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Calhoun, Clinton, Franklin, Gallatin and 24 more | 2 hr |
| Jun 4, 6:27 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 14 more | 93 min |
| Jun 3, 7:09 PM CDT | Tornado Watch | SPC | Dunklin, Pemiscot | 7 hr |
| Jun 3, 7:47 PM CDT | Mesoscale Discussion | SPC | Barry, Barton, Cedar, Dade, Greene, Jasper and 6 more | 58 min |
| Jun 3, 8:34 PM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 56 min |
| Jun 4, 1:51 AM CDT | Mesoscale Discussion | SPC | McDonald | 54 min |
| Jun 3, 11:13 PM CDT | Mesoscale Discussion | SPC | Hardin, McNairy | 62 min |
| Jun 4, 3:14 AM CDT | Mesoscale Discussion | SPC | Fayette, Hardeman, McNairy, Shelby | 91 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2012Severe Thunderstorm Watches in Kentucky, 2012Severe Thunderstorm Watches in Missouri, 2012Every severe thunderstorm watch in 2012
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.