Alert archive / Ohio / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 446
The Storm Prediction Center issued this severe thunderstorm watch at Jul 1, 2012, 4:32 PM EDT for 34 counties in Ohio; 24 counties in West Virginia. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 1, 2012, 4:32 PM EDT (20:32 UTC)
- Expired
- Jul 1, 2012, 10:11 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 58 counties
Athens County, OH, Belmont County, OH, Carroll County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Guernsey County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Jefferson County, OH, Lawrence County, OH, Licking County, OH, Madison County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Ross County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Boone County, WV, Brooke County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Gilmer County, WV, Hancock County, WV, Jackson County, WV, Kanawha County, WV, Lincoln County, WV, Logan County, WV, Marshall County, WV, Mason County, WV, Ohio County, WV, Pleasants County, WV, Putnam County, WV, Ritchie County, WV, Roane County, WV, Tyler County, WV, Wayne County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV
The radar
The Cincinnati radar (KILN), 112 km from the middle of the area, began a volume at 20:36 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
- 60%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
30 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 5:29 PM EDT | Severe Thunderstorm Warning | ILN | Champaign, Clark, Greene, Madison | 46 min |
| Jul 1, 5:38 PM EDT | Severe Thunderstorm Warning | ILN | Fayette, Pickaway, Ross | 52 min |
| Jul 1, 5:44 PM EDT | Severe Thunderstorm Warning | ILN | Fayette, Franklin, Madison, Pickaway | 46 min |
| Jul 1, 5:45 PM EDT | Severe Thunderstorm Warning | ILN | Clinton, Fayette, Greene, Madison, Montgomery, Warren | 45 min |
| Jul 1, 6:14 PM EDT | Severe Thunderstorm Warning | ILN | Fayette, Franklin, Madison, Pickaway, Ross | 46 min |
| Jul 1, 6:21 PM EDT | Severe Thunderstorm Warning | ILN | Hocking, Pickaway, Ross | 54 min |
| Jul 1, 6:26 PM EDT | Severe Thunderstorm Warning | ILN | Fairfield, Franklin, Hocking, Licking, Pickaway | 49 min |
| Jul 1, 6:32 PM EDT | Severe Thunderstorm Warning | RLX | Jackson, Vinton | 58 min |
| Jul 1, 6:51 PM EDT | Severe Thunderstorm Warning | ILN | Brown, Butler, Clermont, Hamilton, Warren | 30 min |
| Jul 1, 6:59 PM EDT | Severe Thunderstorm Warning | ILN | Fairfield, Hocking, Licking | 46 min |
| Jul 1, 7:03 PM EDT | Severe Thunderstorm Warning | ILN | Brown, Clinton, Highland, Warren | 42 min |
| Jul 1, 7:06 PM EDT | Severe Thunderstorm Warning | RLX | Athens, Meigs, Morgan, Perry, Vinton, Washington | 39 min |
| Jul 1, 7:07 PM EDT | Severe Thunderstorm Warning | ILN | Hocking, Pickaway, Pike, Ross | 25 min |
| Jul 1, 7:16 PM EDT | Severe Thunderstorm Warning | ILN | Adams, Brown, Clermont, Highland | 44 min |
| Jul 1, 7:26 PM EDT | Severe Thunderstorm Warning | PBZ | Guernsey, Muskingum, Noble | 64 min |
| Jul 1, 7:27 PM EDT | Severe Thunderstorm Warning | RLX | Athens, Gallia, Jackson, Lawrence, Meigs, Vinton | 63 min |
| Jul 1, 7:35 PM EDT | Severe Thunderstorm Warning | ILN | Adams, Highland, Pike, Scioto | 40 min |
| Jul 1, 7:40 PM EDT | Severe Thunderstorm Warning | PBZ | Coshocton, Guernsey, Tuscarawas | 65 min |
| Jul 1, 7:42 PM EDT | Severe Thunderstorm Warning | RLX | Athens, Meigs, Morgan, Perry, Vinton, Washington | 78 min |
| Jul 1, 7:58 PM EDT | Severe Thunderstorm Warning | RLX | Boone, Braxton, Cabell, Calhoun, Clay, Gilmer and 8 more | 62 min |
| Jul 1, 8:10 PM EDT | Severe Thunderstorm Warning | RLX | Lawrence | 65 min |
| Jul 1, 8:12 PM EDT | Severe Thunderstorm Warning | ILN | Adams, Brown, Pike, Scioto | 57 min |
| Jul 1, 8:30 PM EDT | Severe Thunderstorm Warning | PBZ | Carroll, Harrison, Jefferson, Tuscarawas | 60 min |
| Jul 1, 8:34 PM EDT | Severe Thunderstorm Warning | RLX | Washington | 56 min |
| Jul 1, 8:42 PM EDT | Severe Thunderstorm Warning | RLX | Wayne | 48 min |
| Jul 1, 8:44 PM EDT | Severe Thunderstorm Warning | PBZ | Coshocton, Guernsey, Tuscarawas | 29 min |
| Jul 1, 8:55 PM EDT | Severe Thunderstorm Warning | RLX | Boone, Braxton, Calhoun, Clay, Fayette, Gilmer and 8 more | 65 min |
| Jul 1, 9:06 PM EDT | Severe Thunderstorm Warning | PBZ | Belmont, Harrison, Jefferson | 39 min |
| Jul 1, 9:15 PM EDT | Severe Thunderstorm Warning | RLX | Lawrence | 60 min |
| Jul 1, 9:24 PM EDT | Severe Thunderstorm Warning | RLX | Barbour, Braxton, Doddridge, Gilmer, Harrison, Lewis and 2 more | 41 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 12:00Z, 8.5 hours before the alert went out and 110 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
- 2142 J/kg
- Mixed-layer CIN
- -87 J/kg
- Mixed-layer LCL
- 1001 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 5.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 1:16 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Auglaize, Champaign, Clark, Darke, Defiance and 11 more | 6 hr |
| Jul 1, 3:56 PM EDT | Mesoscale Discussion | SPC | Allen, Athens, Auglaize, Champaign, Clark, Clinton and 36 more | 94 min |
| Jul 1, 5:19 PM EDT | Mesoscale Discussion | SPC | Ashland, Crawford, Erie, Fulton, Hancock, Henry and 16 more | 56 min |
| Jul 1, 5:40 PM EDT | Severe Thunderstorm Watch | SPC | Ashland, Crawford, Cuyahoga, Erie, Geauga, Hancock and 19 more | 4 hr |
| Jul 1, 5:45 PM EDT | Mesoscale Discussion | SPC | Athens, Champaign, Clark, Clinton, Darke, Delaware and 20 more | 60 min |
| Jul 1, 5:59 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Butler, Clermont, Hamilton, Scioto | 5 hr |
| Jul 1, 6:47 PM EDT | Mesoscale Discussion | SPC | Ashland, Coshocton, Crawford, Erie, Hancock, Holmes and 14 more | 58 min |
| Jul 1, 7:22 PM EDT | Mesoscale Discussion | SPC | Carroll, Columbiana, Geauga, Harrison, Jefferson, Mahoning and 4 more | 83 min |
| Jul 1, 9:27 AM EDT | Mesoscale Discussion | SPC | McDowell, Mercer, Monroe, Wyoming | 63 min |
| Jul 1, 9:44 AM EDT | Severe Thunderstorm Watch | SPC | McDowell, Mercer | 5 hr |
Nearby
Severe Thunderstorm Watches in Ohio, 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.