Alert archive / Pennsylvania / Tornado Watches in 2013
Tornado Watch 133
The Storm Prediction Center issued this tornado watch at Apr 19, 2013, 3:55 PM EDT for 36 counties in Pennsylvania. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2013, 3:55 PM EDT (19:55 UTC)
- Expired
- Apr 19, 2013, 9:27 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 36 counties
Adams County, PA, Berks County, PA, Bradford County, PA, Carbon County, PA, Centre County, PA, Chester County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Lycoming County, PA, Mifflin County, PA, Monroe County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Pike County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA, York County, PA
The radar
The State College radar (KCCX), 93 km from the middle of the area, began a volume at 19:57 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
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 4:10 PM EDT | Severe Thunderstorm Warning | CTP | Bedford, Blair, Centre, Clearfield, Clinton, Huntingdon and 4 more | 80 min |
| Apr 19, 5:37 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 38 min |
| Apr 19, 6:14 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 46 min |
| Apr 19, 6:22 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Dauphin, Juniata, Lebanon, Lycoming, Montour and 5 more | 83 min |
| Apr 19, 6:27 PM EDT | Tornado Warning | BGM | Bradford, Susquehanna | 33 min |
| Apr 19, 6:39 PM EDT | Severe Thunderstorm Warning | CTP | Adams, Cumberland, Dauphin, Lancaster, Lebanon, York | 81 min |
| Apr 19, 6:50 PM EDT | Severe Thunderstorm Warning | BGM | Bradford, Lackawanna, Luzerne, Susquehanna, Wyoming | 40 min |
| Apr 19, 6:58 PM EDT | Tornado Warning | BGM | Bradford, Susquehanna | 62 min |
| Apr 19, 7:29 PM EDT | Severe Thunderstorm Warning | BGM | Lackawanna, Luzerne, Pike, Susquehanna, Wayne, Wyoming | 61 min |
| Apr 19, 7:45 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 45 min |
| Apr 19, 8:06 PM EDT | Severe Thunderstorm Warning | BGM | Pike, Wayne | 54 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, 7.9 hours before the alert went out and 193 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
- 16 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 705 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 215 m²/s²
- 0-3 km storm-relative helicity
- 226 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 |
|---|---|---|---|---|
| Apr 19, 1:27 PM EDT | Mesoscale Discussion | SPC | Adams, Chester, Lancaster, York | 63 min |
| Apr 19, 3:36 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Carbon, Chester, Columbia and 25 more | 54 min |
| Apr 19, 6:02 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Carbon, Chester, Columbia and 21 more | 58 min |
| Apr 19, 7:12 PM EDT | Mesoscale Discussion | SPC | Bucks, Delaware, Montgomery, Philadelphia | 93 min |
Nearby
Tornado Watches in Pennsylvania, 2013Every tornado 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.