Alert archive / Ohio / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 758

August 9, 201121 counties in Ohio; 4 counties in Pennsylvania

The Storm Prediction Center issued this severe thunderstorm watch at Aug 9, 2011, 6:56 PM EDT for 21 counties in Ohio; 4 counties in Pennsylvania. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Aug 9, 2011, 6:56 PM EDT (22:56 UTC)
Expired: Aug 10, 2011, 12:00 AM EDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1 in
Strongest gust expected: 60 kt

All 25 counties

Ashland County, OH, Ashtabula County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Cuyahoga County, OH, Geauga County, OH, Harrison County, OH, Holmes County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Lorain County, OH, Mahoning County, OH, Medina County, OH, Portage 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), 23 km from the middle of the area, began a volume at 22:59 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: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 5%
Ten or more severe hail reports: 20%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 60%

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
Aug 9, 7:06 PM EDT	Severe Thunderstorm Warning	CLE	Cuyahoga, Lorain	69 min
Aug 9, 7:24 PM EDT	Severe Thunderstorm Warning	CLE	Erie, Huron, Lorain, Medina	36 min
Aug 9, 7:44 PM EDT	Severe Thunderstorm Warning	CLE	Ashland, Crawford, Huron, Richland, Seneca	46 min
Aug 9, 8:13 PM EDT	Severe Thunderstorm Warning	CLE	Cuyahoga, Geauga, Portage, Summit	47 min
Aug 9, 8:23 PM EDT	Severe Thunderstorm Warning	CLE	Ashland, Medina, Summit, Wayne	67 min
Aug 9, 8:45 PM EDT	Severe Thunderstorm Warning	CLE	Stark	75 min
Aug 9, 9:12 PM EDT	Severe Thunderstorm Warning	CLE	Mahoning, Portage, Trumbull	63 min
Aug 9, 9:53 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Harrison, Jefferson, Tuscarawas	52 min
Aug 9, 10:46 PM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Jefferson	44 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 9, 3:28 PM EDT	Severe Thunderstorm Watch	SPC	Allen, Auglaize, Butler, Champaign, Clark, Crawford and 34 more	7 hr
Aug 9, 6:35 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Auglaize, Champaign, Clark, Crawford and 29 more	85 min
Aug 9, 12:48 PM EDT	Mesoscale Discussion	SPC	Bucks, Chester, Delaware, Montgomery, Philadelphia	57 min
Aug 9, 3:05 PM EDT	Mesoscale Discussion	SPC	Adams, Berks, Bradford, Bucks, Carbon, Centre and 31 more	55 min
Aug 9, 4:16 PM EDT	Severe Thunderstorm Watch	SPC	Berks, Bradford, Bucks, Carbon, Chester, Columbia and 19 more	5 hr
Aug 9, 7:07 PM EDT	Mesoscale Discussion	SPC	Bucks, Carbon, Chester, Delaware, Lackawanna, Lehigh and 6 more	83 min

Nearby

Severe Thunderstorm Watches in Ohio, 2011 Severe Thunderstorm Watches in Pennsylvania, 2011 Every severe thunderstorm watch in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.