Alert archive / Ohio / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 561
The Storm Prediction Center issued this severe thunderstorm watch at Aug 4, 2012, 7:50 PM EDT for 26 counties in Ohio. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2012, 7:50 PM EDT (23:50 UTC)
- Expired
- Aug 5, 2012, 1:13 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 26 counties
Ashland County, OH, Auglaize County, OH, Champaign County, OH, Crawford County, OH, Darke County, OH, Delaware County, OH, Erie County, OH, Hancock County, OH, Hardin County, OH, Huron County, OH, Knox County, OH, Logan County, OH, Lorain County, OH, Lucas County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Morrow County, OH, Ottawa County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Wood County, OH, Wyandot County, OH
The radar
The Northern Indiana radar (KIWX), 163 km from the middle of the area, began a volume at 23:52 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
- 70%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 8:09 PM EDT | Severe Thunderstorm Warning | CLE | Ottawa, Sandusky | 55 min |
| Aug 4, 8:38 PM EDT | Severe Thunderstorm Warning | ILN | Darke, Mercer | 67 min |
| Aug 4, 9:01 PM EDT | Severe Thunderstorm Warning | ILN | Auglaize, Shelby | 59 min |
| Aug 4, 9:19 PM EDT | Severe Thunderstorm Warning | CLE | Hancock, Lucas, Wood | 71 min |
| Aug 4, 9:31 PM EDT | Severe Thunderstorm Warning | ILN | Auglaize, Hardin, Logan, Shelby | 59 min |
| Aug 4, 10:04 PM EDT | Severe Thunderstorm Warning | CLE | Ottawa, Sandusky, Seneca, Wyandot | 71 min |
| Aug 4, 10:37 PM EDT | Severe Thunderstorm Warning | CLE | Marion | 53 min |
| Aug 4, 10:43 PM EDT | Severe Thunderstorm Warning | CLE | Crawford, Erie, Huron | 62 min |
| Aug 4, 11:30 PM EDT | Severe Thunderstorm Warning | CLE | Ashland, Lorain, Medina | 40 min |
| Aug 4, 11:56 PM EDT | Severe Thunderstorm Warning | CLE | Knox | 47 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
Detroit, MI (KDTX), launched 12:00Z, 11.8 hours before the alert went out and 179 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
- 79 J/kg
- Mixed-layer CIN
- -100 J/kg
- Mixed-layer LCL
- 1364 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- -15 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 |
|---|---|---|---|---|
| Aug 4, 5:35 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Defiance, Fulton, Henry, Paulding, Putnam and 2 more | 5 hr |
| Aug 4, 7:23 PM EDT | Mesoscale Discussion | SPC | Allen, Ashland, Auglaize, Champaign, Clark, Coshocton and 38 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Ohio, 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.