Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 482
The Storm Prediction Center issued this severe thunderstorm watch at Aug 7, 2013, 3:49 PM EDT for 8 counties in Ohio; 23 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 7, 2013, 3:49 PM EDT (19:49 UTC)
- Expired
- Aug 7, 2013, 9:49 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 50 kt
All 35 counties
Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Tuscarawas 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, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon 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), 27 km from the middle of the area, began a volume at 19:52 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
- 2%
- Ten or more severe wind reports
- 30%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 4:03 PM EDT | Severe Thunderstorm Warning | PBZ | Carroll, Columbiana | 42 min |
| Aug 7, 4:22 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 38 min |
| Aug 7, 4:29 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Forest, Jefferson | 46 min |
| Aug 7, 4:40 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield, Elk | 65 min |
| Aug 7, 5:16 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana | 44 min |
| Aug 7, 5:36 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clearfield, Clinton | 54 min |
| Aug 7, 5:55 PM EDT | Severe Thunderstorm Warning | PBZ | Indiana, Westmoreland | 50 min |
| Aug 7, 5:57 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 63 min |
| Aug 7, 6:16 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 59 min |
| Aug 7, 6:23 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton, Huntingdon | 67 min |
| Aug 7, 6:27 PM EDT | Tornado Warning | CTP | Bedford, Blair, Cambria, Somerset | 48 min |
| Aug 7, 7:13 PM EDT | Tornado Warning | CTP | Bedford, Cambria, Somerset | 47 min |
| Aug 7, 7:58 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Cambria, Somerset | 62 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, 7.8 hours before the alert went out and 44 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
- 22 J/kg
- Mixed-layer CIN
- -139 J/kg
- Mixed-layer LCL
- 1075 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 6:37 AM EDT | Mesoscale Discussion | SPC | Williams | 113 min |
| Aug 7, 8:52 AM EDT | Mesoscale Discussion | SPC | Allen, Crawford, Cuyahoga, Defiance, Erie, Fulton and 15 more | 113 min |
| Aug 7, 11:20 AM EDT | Mesoscale Discussion | SPC | Ashland, Ashtabula, Carroll, Columbiana, Crawford, Cuyahoga and 22 more | 85 min |
| Aug 7, 2:46 PM EDT | Mesoscale Discussion | SPC | Defiance, Williams | 119 min |
| Aug 7, 3:24 PM EDT | Mesoscale Discussion | SPC | Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more | 66 min |
| Aug 7, 5:52 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Blair, Centre, Cumberland, Dauphin and 9 more | 83 min |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2013Severe Thunderstorm Watches in Ohio, 2013Severe Thunderstorm Watches in West Virginia, 2013Every severe thunderstorm watch in 2013
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.