Alert archive / Ohio / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 539
The Storm Prediction Center issued this severe thunderstorm watch at Jul 18, 2007, 10:59 PM EDT for 62 counties in Ohio. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2007, 10:59 PM EDT (02:59 UTC)
- Expired
- Jul 19, 2007, 5:07 AM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 62 counties
Allen County, OH, Ashland County, OH, Ashtabula County, OH, Auglaize County, OH, Belmont County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Darke County, OH, Defiance County, OH, Delaware County, OH, Erie County, OH, Fairfield County, OH, Franklin County, OH, Fulton County, OH, Geauga County, OH, Guernsey County, OH, Hancock County, OH, Hardin County, OH, Harrison County, OH, Henry County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Licking County, OH, Logan County, OH, Lorain County, OH, Lucas County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Mercer County, OH, Miami County, OH, Monroe County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Ottawa County, OH, Paulding County, OH, Portage County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Van Wert County, OH, Wayne County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH
The radar
The Cleveland radar (KCLE), 106 km from the middle of the area, began a volume at 03:02 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
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- 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 19, 12:26 AM EDT | Severe Thunderstorm Warning | CLE | Ashtabula | 64 min |
| Jul 19, 1:04 AM EDT | Severe Thunderstorm Warning | CLE | Holmes | 56 min |
| Jul 19, 2:00 AM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 30 min |
| Jul 19, 2:54 AM EDT | Severe Thunderstorm Warning | CLE | Morrow | 51 min |
| Jul 19, 3:06 AM EDT | Severe Thunderstorm Warning | ILN | Darke | 39 min |
| Jul 19, 3:08 AM EDT | Flash Flood Warning | CLE | Holmes | 6 hr |
| Jul 19, 3:21 AM EDT | Flash Flood Warning | PBZ | Coshocton | 6 hr |
| Jul 19, 3:35 AM EDT | Flash Flood Warning | CLE | Knox | 6 hr |
| Jul 19, 3:53 AM EDT | Severe Thunderstorm Warning | ILN | Fairfield | 37 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 00:00Z, 3.0 hours before the alert went out and 183 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
- 1365 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 1274 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 3.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 10:06 PM EDT | Mesoscale Discussion | SPC | Allen, Auglaize, Butler, Champaign, Clark, Clinton and 37 more | 84 min |
| Jul 19, 10:09 AM EDT | Mesoscale Discussion | SPC | Gallia, Lawrence, Meigs | 96 min |
| Jul 19, 12:45 PM EDT | Mesoscale Discussion | SPC | Adams, Brown, Butler, Clermont, Clinton, Gallia and 9 more | 60 min |
| Jul 19, 1:07 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Butler, Clermont, Clinton, Gallia and 10 more | 8 hr |
| Jul 19, 3:54 PM EDT | Mesoscale Discussion | SPC | Crawford, Erie, Fulton, Hancock, Henry, Huron and 7 more | 96 min |
| Jul 19, 7:15 PM EDT | Mesoscale Discussion | SPC | Allen, Ashland, Ashtabula, Auglaize, Carroll, Champaign and 31 more | 90 min |
| Jul 19, 2:07 PM EDT | Severe Thunderstorm Watch | SPC | Grant, Hardy, Pendleton | 8 hr |
| Jul 19, 6:27 PM EDT | Mesoscale Discussion | SPC | Jefferson, Pendleton | 93 min |
| Jul 19, 6:38 PM EDT | Mesoscale Discussion | SPC | Boone, Cabell, Fayette, Kanawha, Lincoln, Logan and 5 more | 97 min |
Nearby
Severe Thunderstorm Watches in Ohio, 2007Every severe thunderstorm watch in 2007
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.