Alert archive / Pennsylvania / Tornado Watches in 2010
Tornado Watch 533
The Storm Prediction Center issued this tornado watch at Jul 24, 2010, 6:48 PM EDT for 22 counties in Pennsylvania. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 24, 2010, 6:48 PM EDT (22:48 UTC)
- Expired
- Jul 24, 2010, 10:39 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 22 counties
Bradford County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Elk County, PA, Lackawanna County, PA, Luzerne County, PA, Lycoming County, PA, McKean County, PA, Montour County, PA, Northumberland County, PA, Pike County, PA, Potter County, PA, Schuylkill County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA
The radar
The State College radar (KCCX), 108 km from the middle of the area, began a volume at 22:48 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 6:48 PM EDT | Tornado Warning | CTP | Potter, Tioga | 27 min |
| Jul 24, 7:10 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk | 50 min |
| Jul 24, 7:13 PM EDT | Tornado Warning | CTP | Lycoming, Potter, Tioga | 47 min |
| Jul 24, 7:21 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 33 min |
| Jul 24, 7:31 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Potter, Tioga | 35 min |
| Jul 24, 7:45 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming, Potter, Sullivan, Tioga | 60 min |
| Jul 24, 8:14 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield, Elk | 76 min |
| Jul 24, 8:18 PM EDT | Severe Thunderstorm Warning | CTP | Clinton, Lycoming | 42 min |
| Jul 24, 8:35 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 40 min |
| Jul 24, 8:57 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Columbia, Lycoming, Montour, Northumberland and 2 more | 78 min |
| Jul 24, 9:35 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 55 min |
| Jul 24, 9:45 PM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 29 min |
| Jul 24, 9:59 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 46 min |
| Jul 24, 10:00 PM EDT | Severe Thunderstorm Warning | BGM | Wayne | 32 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
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.8 hours before the alert went out and 209 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
- 696 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 476 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 93 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 |
|---|---|---|---|---|
| Jul 23, 9:06 PM EDT | Mesoscale Discussion | SPC | Armstrong, Blair, Cambria, Cameron, Centre, Clarion and 23 more | 54 min |
| Jul 23, 10:45 PM EDT | Mesoscale Discussion | SPC | Armstrong, Beaver, Butler, Clarion, Clearfield, Crawford and 7 more | 90 min |
| Jul 24, 4:02 PM EDT | Mesoscale Discussion | SPC | Bradford, Erie, McKean, Potter, Susquehanna, Tioga and 2 more | 58 min |
| Jul 24, 4:14 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Cameron, Clinton, Elk, Lycoming, McKean and 7 more | 6 hr |
| Jul 24, 5:34 PM EDT | Mesoscale Discussion | SPC | Beaver, Butler, Crawford, Lawrence, Mercer, Venango | 86 min |
| Jul 24, 6:10 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 9 more | 4 hr |
| Jul 24, 6:22 PM EDT | Mesoscale Discussion | SPC | Bradford, Cameron, Clinton, Columbia, Elk, Lackawanna and 11 more | 53 min |
Nearby
Tornado Watches in Pennsylvania, 2010Every tornado watch in 2010
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.