Alert archive / Ohio / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 695
The Storm Prediction Center issued this severe thunderstorm watch at Jul 28, 2011, 4:03 PM EDT for 36 counties in Ohio; 16 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2011, 4:03 PM EDT (20:03 UTC)
- Expired
- Jul 28, 2011, 10:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 56 counties
Ashland County, OH, Ashtabula County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Guernsey County, OH, Hancock County, OH, Harrison County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Mahoning County, OH, Marion 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, Wood County, OH, Wyandot County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Crawford County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV
The radar
The Cleveland radar (KCLE), 69 km from the middle of the area, began a volume at 20:04 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
- 5%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 80%
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 28, 4:27 PM EDT | Severe Thunderstorm Warning | CLE | Erie, Huron | 28 min |
| Jul 28, 4:28 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana, Westmoreland | 47 min |
| Jul 28, 5:01 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana | 44 min |
| Jul 28, 5:20 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler, Lawrence, Westmoreland | 40 min |
| Jul 28, 5:28 PM EDT | Severe Thunderstorm Warning | PBZ | Columbiana | 32 min |
| Jul 28, 5:59 PM EDT | Severe Thunderstorm Warning | PBZ | Columbiana | 46 min |
| Jul 28, 6:16 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Armstrong, Butler, Indiana, Westmoreland | 59 min |
| Jul 28, 7:12 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 33 min |
| Jul 28, 7:43 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 23 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 12:00Z, 8.1 hours before the alert went out and 155 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
- 62 J/kg
- Mixed-layer CIN
- -115 J/kg
- Mixed-layer LCL
- 1137 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 189 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 3:43 PM EDT | Mesoscale Discussion | SPC | Ashland, Belmont, Carroll, Columbiana, Coshocton, Crawford and 33 more | 62 min |
| Jul 28, 7:02 PM EDT | Mesoscale Discussion | SPC | Carroll, Columbiana, Coshocton, Harrison, Holmes, Jefferson and 6 more | 58 min |
Nearby
Severe Thunderstorm Watches in Ohio, 2011Severe Thunderstorm Watches in Pennsylvania, 2011Severe Thunderstorm Watches in West Virginia, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.