Alert archive / Ohio / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 468
The Storm Prediction Center issued this severe thunderstorm watch at Jul 5, 2012, 6:16 AM EDT for 27 counties in Ohio; 4 counties in Pennsylvania. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 5, 2012, 6:16 AM EDT (10:16 UTC)
- Expired
- Jul 5, 2012, 9:00 AM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 31 counties
Ashland County, OH, Ashtabula County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Lake County, OH, Lorain County, OH, Mahoning County, OH, Medina County, OH, Morrow County, OH, Ottawa County, OH, Portage County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Wayne County, OH, Crawford County, PA, Erie County, PA, Lawrence County, PA, Mercer County, PA
The radar
The Cleveland radar (KCLE), 13 km from the middle of the area, began a volume at 10:16 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
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 6:36 AM EDT | Severe Thunderstorm Warning | CLE | Geauga, Lake | 54 min |
| Jul 5, 6:41 AM EDT | Severe Thunderstorm Warning | CLE | Lorain, Medina, Summit | 79 min |
| Jul 5, 6:53 AM EDT | Severe Thunderstorm Warning | CLE | Huron | 43 min |
| Jul 5, 7:09 AM EDT | Severe Thunderstorm Warning | CLE | Ashland, Wayne | 51 min |
| Jul 5, 7:12 AM EDT | Severe Thunderstorm Warning | CLE | Portage | 63 min |
| Jul 5, 7:50 AM EDT | Severe Thunderstorm Warning | PBZ | Carroll, Columbiana, Coshocton, Harrison, Jefferson, Tuscarawas | 40 min |
| Jul 5, 8:34 AM EDT | Flash Flood Warning | CLE | Morrow | 6 hr |
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 00:00Z, 10.3 hours before the alert went out and 182 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
- 4748 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 1268 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 9.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 9:48 PM EDT | Mesoscale Discussion | SPC | Athens, Belmont, Carroll, Champaign, Clark, Clinton and 35 more | 87 min |
| Jul 4, 10:19 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Athens, Auglaize, Belmont, Brown, Butler and 46 more | 4 hr |
| Jul 5, 4:12 AM EDT | Mesoscale Discussion | SPC | Cuyahoga, Erie, Huron, Lake, Lorain, Lucas and 2 more | 93 min |
| Jul 5, 8:00 AM EDT | Mesoscale Discussion | SPC | Athens, Belmont, Carroll, Columbiana, Coshocton, Fairfield and 18 more | 90 min |
| Jul 5, 11:14 AM EDT | Mesoscale Discussion | SPC | Gallia, Lawrence | 91 min |
| Jul 5, 11:37 AM EDT | Severe Thunderstorm Watch | SPC | Lawrence | 7 hr |
| Jul 5, 3:27 PM EDT | Mesoscale Discussion | SPC | Allen, Auglaize, Defiance, Fulton, Hancock, Hardin and 14 more | 93 min |
| Jul 5, 5:58 PM EDT | Mesoscale Discussion | SPC | Allen, Auglaize, Butler, Champaign, Clark, Clermont and 33 more | 92 min |
| Jul 4, 8:05 PM EDT | Mesoscale Discussion | SPC | Bedford, Fayette, Fulton, Somerset | 55 min |
| Jul 5, 4:37 PM EDT | Mesoscale Discussion | SPC | Adams, Blair, Centre, Cumberland, Dauphin, Franklin and 6 more | 113 min |
Nearby
Severe Thunderstorm Watches in Ohio, 2012Severe Thunderstorm Watches in Pennsylvania, 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.