Alert archive / Ohio / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 466
The Storm Prediction Center issued this severe thunderstorm watch at Jul 4, 2012, 10:19 PM EDT for 52 counties in Ohio; 8 counties in Pennsylvania; 5 counties in West Virginia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2012, 10:19 PM EDT (02:19 UTC)
- Expired
- Jul 5, 2012, 2:00 AM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 65 counties
Adams County, OH, Athens County, OH, Auglaize County, OH, Belmont County, OH, Brown County, OH, Butler County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Hardin County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Jefferson County, OH, Lawrence County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Meigs County, OH, Mercer County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Allegheny County, PA, Beaver County, PA, Butler County, PA, Greene County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV, Wetzel County, WV
The radar
The Cleveland radar (KCLE), 118 km from the middle of the area, began a volume at 02:19 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
- 5%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- 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
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 10:35 PM EDT | Severe Thunderstorm Warning | ILN | Champaign, Logan | 25 min |
| Jul 4, 10:35 PM EDT | Severe Thunderstorm Warning | PBZ | Carroll, Columbiana | 55 min |
| Jul 4, 10:45 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler, Lawrence, Mercer | 25 min |
| Jul 4, 11:08 PM EDT | Severe Thunderstorm Warning | PBZ | Carroll, Columbiana, Jefferson | 52 min |
| Jul 4, 11:36 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler, Clarion, Indiana | 39 min |
| Jul 4, 11:44 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 46 min |
| Jul 4, 11:46 PM EDT | Severe Thunderstorm Warning | RLX | Morgan, Perry | 44 min |
| Jul 5, 12:11 AM EDT | Severe Thunderstorm Warning | PBZ | Belmont, Jefferson | 64 min |
| Jul 5, 1:13 AM EDT | Severe Thunderstorm Warning | PBZ | Belmont | 62 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
Pittsburgh, PA (KPIT), launched 00:00Z, 2.3 hours before the alert went out and 148 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
- 1419 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 2023 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 133 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 |
|---|---|---|---|---|
| Jul 4, 9:48 PM EDT | Mesoscale Discussion | SPC | Athens, Belmont, Carroll, Champaign, Clark, Clinton and 35 more | 87 min |
| Jul 5, 4:12 AM EDT | Mesoscale Discussion | SPC | Cuyahoga, Erie, Huron, Lake, Lorain, Lucas and 2 more | 93 min |
| Jul 5, 6:16 AM EDT | Severe Thunderstorm Watch | SPC | Ashland, Ashtabula, Carroll, Columbiana, Coshocton, Crawford and 21 more | 3 hr |
| 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 |
| Jul 5, 2:57 PM EDT | Mesoscale Discussion | SPC | Greenbrier, McDowell, Mercer, Monroe, Summers | 2 hr |
Nearby
Severe Thunderstorm Watches in Ohio, 2012Severe Thunderstorm Watches in Pennsylvania, 2012Severe Thunderstorm Watches in West Virginia, 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.