Alert archive / Indiana / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 125

April 1, 201217 counties in Indiana; 12 counties in Kentucky; 9 counties in Ohio

The Storm Prediction Center issued this severe thunderstorm watch at Apr 1, 2012, 10:03 PM EDT for 17 counties in Indiana; 12 counties in Kentucky; 9 counties in Ohio. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Apr 1, 2012, 10:03 PM EDT (02:03 UTC)
Expired: Apr 2, 2012, 2:20 AM EDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 38 counties

Bartholomew County, IN, Dearborn County, IN, Decatur County, IN, Fayette County, IN, Franklin County, IN, Hamilton County, IN, Hancock County, IN, Henry County, IN, Jennings County, IN, Madison County, IN, Ohio County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Switzerland County, IN, Union County, IN, Wayne County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Gallatin County, KY, Grant County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Adams County, OH, Brown County, OH, Butler County, OH, Clermont County, OH, Clinton County, OH, Hamilton County, OH, Highland County, OH, Preble County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 91 km from the middle of the area, began a volume at 02:05 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: 20%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Apr 1, 10:14 PM EDT	Severe Thunderstorm Warning	IND	Hancock, Henry, Rush	31 min
Apr 1, 10:16 PM EDT	Severe Thunderstorm Warning	IND	Hamilton, Hancock, Marion, Shelby	29 min
Apr 1, 10:19 PM EDT	Severe Thunderstorm Warning	ILN	Butler, Preble	41 min
Apr 1, 10:44 PM EDT	Severe Thunderstorm Warning	IND	Rush	31 min
Apr 1, 10:45 PM EDT	Severe Thunderstorm Warning	IND	Hancock, Marion, Shelby	30 min
Apr 1, 10:56 PM EDT	Severe Thunderstorm Warning	ILN	Butler, Hamilton, Warren	64 min
Apr 1, 11:04 PM EDT	Severe Thunderstorm Warning	ILN	Dearborn, Franklin, Union	41 min
Apr 1, 11:09 PM EDT	Severe Thunderstorm Warning	IND	Decatur, Rush	36 min
Apr 1, 11:14 PM EDT	Severe Thunderstorm Warning	IND	Bartholomew, Decatur, Shelby	46 min
Apr 1, 11:20 PM EDT	Severe Thunderstorm Warning	ILN	Campbell, Kenton	40 min
Apr 1, 11:31 PM EDT	Severe Thunderstorm Warning	ILN	Dearborn, Franklin, Ohio	32 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 1, 9:23 PM EDT	Mesoscale Discussion	SPC	Dearborn, Decatur, Fayette, Franklin, Hamilton, Hancock and 6 more	67 min
Apr 1, 11:31 PM EDT	Mesoscale Discussion	SPC	Clark, Dearborn, Decatur, Franklin, Jefferson, Jennings and 4 more	59 min
Apr 2, 12:30 AM EDT	Mesoscale Discussion	SPC	Dearborn, Ohio, Ripley, Switzerland	60 min

Nearby

Severe Thunderstorm Watches in Indiana, 2012 Severe Thunderstorm Watches in Kentucky, 2012 Severe Thunderstorm Watches in Ohio, 2012 Every 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; radar from the NEXRAD Level II archive.