Alert archive / Indiana / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 178
The Storm Prediction Center issued this severe thunderstorm watch at Apr 22, 2011, 1:31 PM CDT for 10 counties in Illinois; 32 counties in Indiana; 12 counties in Kentucky. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2011, 1:31 PM CDT (18:31 UTC)
- Expired
- Apr 22, 2011, 6:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 54 counties
Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Jefferson County, IL, Saline County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Bartholomew County, IN, Brown County, IN, Clark County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Ohio County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Ripley County, IN, Scott County, IN, Spencer County, IN, Sullivan County, IN, Switzerland County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Bullitt County, KY, Carroll County, KY, Franklin County, KY, Gallatin County, KY, Henry County, KY, Jefferson County, KY, Meade County, KY, Oldham County, KY, Owen County, KY, Shelby County, KY, Spencer County, KY, Trimble County, KY
The radar
The Evansville,IN radar (KVWX), 40 km from the middle of the area, began a volume at 18:33 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
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 2:08 PM CDT | Severe Thunderstorm Warning | IND | Clay, Daviess, Greene, Knox, Lawrence, Martin and 2 more | 35 min |
| Apr 22, 3:07 PM CDT | Severe Thunderstorm Warning | LMK | Crawford, Perry | 23 min |
| Apr 22, 4:54 PM CDT | Severe Thunderstorm Warning | LMK | Bullitt, Jefferson, Shelby, Spencer | 36 min |
| Apr 22, 5:01 PM CDT | Tornado Warning | LMK | Anderson, Shelby, Spencer | 29 min |
| Apr 22, 5:25 PM CDT | Tornado Warning | LMK | Anderson, Franklin, Shelby, Spencer, Woodford | 35 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, 6.5 hours before the alert went out and 206 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
- 845 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 585 m²/s²
- 0-3 km storm-relative helicity
- 683 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 |
|---|---|---|---|---|
| Apr 22, 10:09 AM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Calhoun, Clinton, Franklin, Greene and 14 more | 66 min |
| Apr 22, 1:14 PM CDT | Mesoscale Discussion | SPC | Crawford, Edwards, Jasper, Lawrence, Richland, Wabash | 61 min |
| Apr 22, 3:34 PM CDT | Tornado Watch | SPC | Calhoun, Greene, Jersey, Macoupin, Madison, Monroe and 2 more | 6 hr |
| Apr 22, 5:21 PM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Macoupin | 114 min |
| Apr 22, 5:27 PM CDT | Mesoscale Discussion | SPC | Clinton, Edwards, Franklin, Gallatin, Hamilton, Hardin and 18 more | 33 min |
| Apr 22, 5:49 PM CDT | Tornado Watch | SPC | Alexander, Bond, Clay, Clinton, Crawford, Edwards and 26 more | 7 hr |
| Apr 22, 3:48 PM CDT | Mesoscale Discussion | SPC | Clark, Jefferson, Ohio, Switzerland | 87 min |
Nearby
Severe Thunderstorm Watches in Indiana, 2011Severe Thunderstorm Watches in Kentucky, 2011Severe Thunderstorm Watches in Illinois, 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.