Alert archive / Ohio / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 720
The Storm Prediction Center issued this severe thunderstorm watch at Aug 3, 2011, 1:48 AM EDT for 20 counties in Indiana; 28 counties in Ohio. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 3, 2011, 1:48 AM EDT (05:48 UTC)
- Expired
- Aug 3, 2011, 10:00 AM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 48 counties
Boone County, IN, Carroll County, IN, Clinton County, IN, Dearborn County, IN, Delaware County, IN, Fountain County, IN, Hamilton County, IN, Hancock County, IN, Henry County, IN, Howard County, IN, Madison County, IN, Montgomery County, IN, Ohio County, IN, Randolph County, IN, Ripley County, IN, Switzerland County, IN, Tippecanoe County, IN, Tipton County, IN, Warren County, IN, Wayne County, IN, Ashland County, OH, Auglaize County, OH, Champaign County, OH, Clark County, OH, Crawford County, OH, Darke County, OH, Delaware County, OH, Franklin County, OH, Greene County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Preble County, OH, Richland County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Wood County, OH, Wyandot County, OH
The radar
The Northern Indiana radar (KIWX), 105 km from the middle of the area, began a volume at 05:49 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 1:52 AM EDT | Severe Thunderstorm Warning | IND | Carroll, Howard, Tipton | 53 min |
| Aug 3, 2:13 AM EDT | Severe Thunderstorm Warning | IND | Boone, Hamilton | 62 min |
| Aug 3, 4:29 AM EDT | Severe Thunderstorm Warning | IND | Howard, Tipton | 46 min |
| Aug 3, 5:12 AM EDT | Tornado Warning | IND | Hamilton, Madison, Tipton | 18 min |
| Aug 3, 5:31 AM EDT | Severe Thunderstorm Warning | IND | Delaware, Hamilton, Madison, Tipton | 44 min |
| Aug 3, 7:24 AM EDT | Severe Thunderstorm Warning | ILN | Dearborn, Fayette, Franklin, Ripley | 51 min |
| Aug 3, 7:39 AM EDT | Severe Thunderstorm Warning | ILN | Dearborn, Franklin | 51 min |
| Aug 3, 8:00 AM EDT | Severe Thunderstorm Warning | ILN | Dearborn, Ohio, Ripley, Switzerland | 60 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
Cncnati-Daytn, OH (KILN), launched 00:00Z, 5.8 hours before the alert went out and 178 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
- 856 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 1530 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 5.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 9:34 PM EDT | Mesoscale Discussion | SPC | DeKalb, Elkhart, Jasper, Kosciusko, LaGrange, Lake and 9 more | 86 min |
| Aug 3, 12:25 AM EDT | Mesoscale Discussion | SPC | Allen, Benton, Carroll, Cass, DeKalb, Elkhart and 16 more | 95 min |
| Aug 3, 4:28 AM EDT | Mesoscale Discussion | SPC | Adams, Athens, Brown, Butler, Champaign, Clark and 44 more | 92 min |
| Aug 3, 8:21 AM EDT | Mesoscale Discussion | SPC | Adams, Athens, Brown, Butler, Champaign, Clark and 44 more | 84 min |
Nearby
Severe Thunderstorm Watches in Ohio, 2011Severe Thunderstorm Watches in Indiana, 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.