Alert archive / Ohio / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 641
The Storm Prediction Center issued this severe thunderstorm watch at Aug 23, 2007, 2:43 PM EDT for 20 counties in Ohio; 20 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 23, 2007, 2:43 PM EDT (18:43 UTC)
- Expired
- Aug 23, 2007, 9:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 44 counties
Ashland County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Jefferson County, OH, Knox County, OH, Mahoning County, OH, Medina County, OH, Muskingum County, OH, Portage County, OH, Richland County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Wayne County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Clarion County, PA, Clearfield County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Somerset 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 Pittsburgh radar (KPBZ), 46 km from the middle of the area, began a volume at 18:44 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
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 2:43 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler | 62 min |
| Aug 23, 2:59 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 61 min |
| Aug 23, 3:01 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 59 min |
| Aug 23, 3:46 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 29 min |
| Aug 23, 4:05 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 55 min |
| Aug 23, 4:06 PM EDT | Flash Flood Warning | PBZ | Indiana | 3 hr |
| Aug 23, 4:07 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 38 min |
| Aug 23, 4:10 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 35 min |
| Aug 23, 4:16 PM EDT | Flash Flood Warning | PBZ | Armstrong | 3 hr |
| Aug 23, 4:18 PM EDT | Severe Thunderstorm Warning | PBZ | Lawrence | 57 min |
| Aug 23, 4:26 PM EDT | Flash Flood Warning | CTP | Cambria | 3 hr |
| Aug 23, 4:28 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 32 min |
| Aug 23, 4:41 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 34 min |
| Aug 23, 4:46 PM EDT | Severe Thunderstorm Warning | CTP | Cambria | 44 min |
| Aug 23, 5:15 PM EDT | Severe Thunderstorm Warning | PBZ | Columbiana | 23 min |
| Aug 23, 5:19 PM EDT | Severe Thunderstorm Warning | PBZ | Westmoreland | 56 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 (KAGC), launched 12:00Z, 6.7 hours before the alert went out and 62 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
- 1968 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 835 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 49 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 |
|---|---|---|---|---|
| Aug 23, 2:48 AM EDT | Mesoscale Discussion | SPC | Defiance, Fulton, Henry, Lucas, Williams | 27 min |
| Aug 23, 11:17 AM EDT | Mesoscale Discussion | SPC | Carroll, Columbiana, Coshocton, Guernsey, Harrison, Holmes and 6 more | 88 min |
| Aug 23, 3:07 PM EDT | Mesoscale Discussion | SPC | Defiance, Fulton, Hancock, Henry, Lucas, Paulding and 4 more | 83 min |
| Aug 23, 4:09 PM EDT | Severe Thunderstorm Watch | SPC | Defiance, Fulton, Henry, Lucas, Ottawa, Paulding and 3 more | 8 hr |
| Aug 23, 5:30 PM EDT | Mesoscale Discussion | SPC | Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 10 more | 60 min |
| Aug 23, 6:38 PM EDT | Mesoscale Discussion | SPC | Defiance, Fulton, Henry, Lucas, Williams, Wood | 97 min |
Nearby
Severe Thunderstorm Watches in Ohio, 2007Severe Thunderstorm Watches in Pennsylvania, 2007Severe Thunderstorm Watches in West Virginia, 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.