Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 342
The Storm Prediction Center issued this severe thunderstorm watch at Jun 23, 2015, 10:20 AM EDT for 13 counties in New Jersey; 36 counties in Pennsylvania. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 23, 2015, 10:20 AM EDT (14:20 UTC)
- Expired
- Jun 23, 2015, 5:37 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 49 counties
Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Adams County, PA, Bedford County, PA, Berks County, PA, Blair County, PA, Bucks County, PA, Cambria County, PA, Carbon County, PA, Centre County, PA, Chester County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Lycoming County, PA, Mifflin County, PA, Monroe County, PA, Montgomery County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Philadelphia County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, Union County, PA, York County, PA
The radar
The State College radar (KCCX), 97 km from the middle of the area, began a volume at 14:21 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
- 5%
- Ten or more severe wind reports
- 50%
- 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
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 10:25 AM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland | 10 min |
| Jun 23, 11:24 AM EDT | Severe Thunderstorm Warning | CTP | Clearfield | 66 min |
| Jun 23, 11:50 AM EDT | Severe Thunderstorm Warning | CTP | Centre, Clearfield | 55 min |
| Jun 23, 12:23 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Clinton, Mifflin, Snyder, Union | 37 min |
| Jun 23, 12:50 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Mifflin, Montour, Northumberland, Snyder and 1 more | 55 min |
| Jun 23, 1:37 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Juniata, Northumberland, Perry, Schuylkill, Snyder | 38 min |
| Jun 23, 1:41 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 49 min |
| Jun 23, 1:55 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 54 min |
| Jun 23, 2:29 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex, Warren | 46 min |
| Jun 23, 3:08 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Franklin, Fulton, Huntingdon, Perry | 67 min |
| Jun 23, 3:40 PM EDT | Severe Thunderstorm Warning | CTP | Cumberland, Dauphin, Lancaster, Lebanon, Perry, York | 65 min |
| Jun 23, 3:56 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Somerset | 64 min |
| Jun 23, 4:06 PM EDT | Flash Flood Warning | CTP | Cumberland | 4 hr |
| Jun 23, 4:11 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 24 min |
| Jun 23, 4:15 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Dauphin, Franklin, York | 60 min |
| Jun 23, 4:44 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 61 min |
| Jun 23, 4:49 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Franklin, York | 56 min |
| Jun 23, 4:54 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 48 min |
| Jun 23, 5:05 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Delaware, Montgomery | 40 min |
| Jun 23, 5:22 PM EDT | Tornado Warning | PHI | Chester | 23 min |
| Jun 23, 5:28 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 47 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 2.3 hours before the alert went out and 180 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
- 387 J/kg
- Mixed-layer CIN
- -168 J/kg
- Mixed-layer LCL
- 1544 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 8:57 AM EDT | Mesoscale Discussion | SPC | Sussex | 63 min |
| Jun 23, 10:12 AM EDT | Severe Thunderstorm Watch | SPC | Bergen, Essex, Hudson, Passaic, Union | 6 hr |
| Jun 23, 1:45 PM EDT | Mesoscale Discussion | SPC | Cumberland | 3 hr |
| Jun 23, 3:25 PM EDT | Mesoscale Discussion | SPC | Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 2 more | 95 min |
| Jun 23, 3:35 PM EDT | Severe Thunderstorm Watch | SPC | Bergen, Essex, Hudson, Passaic, Union | 6 hr |
| Jun 23, 4:09 PM EDT | Severe Thunderstorm Watch | SPC | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more | 7 hr |
| Jun 23, 5:47 PM EDT | Mesoscale Discussion | SPC | Atlantic, Burlington, Camden, Cape May, Cumberland, Essex and 14 more | 88 min |
| Jun 23, 7:41 PM EDT | Mesoscale Discussion | SPC | Atlantic, Burlington, Camden, Cape May, Cumberland, Essex and 14 more | 94 min |
| Jun 23, 3:30 AM EDT | Severe Thunderstorm Watch | SPC | Crawford, Erie | 3 hr |
| Jun 23, 4:24 AM EDT | Mesoscale Discussion | SPC | McKean, Potter, Warren | 66 min |
| Jun 23, 5:30 AM EDT | Mesoscale Discussion | SPC | Cameron, Clarion, Crawford, Elk, Erie, Forest and 8 more | 60 min |
| Jun 23, 6:08 AM EDT | Severe Thunderstorm Watch | SPC | Bradford, Cameron, Centre, Clearfield, Clinton, Elk and 11 more | 4 hr |
| Jun 23, 8:39 AM EDT | Mesoscale Discussion | SPC | Cameron, Centre, Clearfield, Clinton, Columbia, Elk and 12 more | 96 min |
| Jun 23, 10:28 AM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Fayette, Greene, Somerset, Washington and 1 more | 2 hr |
| Jun 23, 1:17 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Fayette, Greene and 3 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2015Severe Thunderstorm Watches in New Jersey, 2015Every severe thunderstorm watch in 2015
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.