Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 176
The Storm Prediction Center issued this severe thunderstorm watch at Jun 13, 2018, 6:33 PM EDT for 36 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 13, 2018, 6:33 PM EDT (22:33 UTC)
- Expired
- Jun 13, 2018, 11:00 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 40 counties
Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Elk 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, Juniata County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Snyder County, PA, Somerset County, PA, Sullivan County, PA, Union 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 State College radar (KCCX), 16 km from the middle of the area, began a volume at 22:33 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
- 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
- 70%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 13, 6:48 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver | 42 min |
| Jun 13, 6:53 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Indiana, Jefferson | 52 min |
| Jun 13, 7:00 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Washington | 45 min |
| Jun 13, 7:06 PM EDT | Tornado Warning | PBZ | Armstrong, Clarion, Indiana | 24 min |
| Jun 13, 7:27 PM EDT | Tornado Warning | PBZ | Armstrong, Indiana | 22 min |
| Jun 13, 7:57 PM EDT | Tornado Warning | CTP | Lycoming, Tioga | 33 min |
| Jun 13, 8:20 PM EDT | Flash Flood Warning | PBZ | Allegheny, Washington, Westmoreland | 79 min |
| Jun 13, 8:21 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria | 39 min |
| Jun 13, 8:22 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Lycoming, Sullivan | 68 min |
| Jun 13, 8:28 PM EDT | Tornado Warning | CTP | Blair, Cambria | 32 min |
| Jun 13, 8:45 PM EDT | Flash Flood Warning | PBZ | Armstrong | 2 hr |
| Jun 13, 9:21 PM EDT | Tornado Warning | CTP | Sullivan | 9 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, 10.6 hours before the alert went out and 182 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
- 191 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 496 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 13, 3:30 PM EDT | Mesoscale Discussion | SPC | Elk, Forest, McKean, Potter, Tioga, Warren | 60 min |
| Jun 13, 4:06 PM EDT | Severe Thunderstorm Watch | SPC | Bradford, Lackawanna, Luzerne, McKean, Potter, Susquehanna and 4 more | 7 hr |
| Jun 13, 6:10 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Bedford, Blair, Butler and 31 more | 95 min |
| Jun 13, 7:12 PM EDT | Mesoscale Discussion | SPC | Bradford, Lackawanna, McKean, Potter, Sullivan, Susquehanna and 4 more | 93 min |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2018Severe Thunderstorm Watches in West Virginia, 2018Every severe thunderstorm watch in 2018
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.