Alert archive / Pennsylvania / Mesoscale Discussions in 2013
Mesoscale Discussion 535
The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2013, 3:36 PM EDT for Warren County, New Jersey; 31 counties in Pennsylvania. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2013, 3:36 PM EDT (19:36 UTC)
- Expired
- Apr 19, 2013, 4:30 PM EDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 32 counties
Warren County, NJ, Adams County, PA, Berks County, PA, Bradford County, PA, Carbon County, PA, Chester County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Juniata County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montgomery 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, Union County, PA, Wayne County, PA, Wyoming County, PA, York County, PA
The radar
The State College radar (KCCX), 151 km from the middle of the area, began a volume at 19:39 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.6 hours before the alert went out and 219 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
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 7:12 PM EDT | Mesoscale Discussion | SPC | Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 15 more | 93 min |
| Apr 19, 1:27 PM EDT | Mesoscale Discussion | SPC | Adams, Chester, Lancaster, York | 63 min |
| Apr 19, 3:55 PM EDT | Tornado Watch | SPC | Adams, Berks, Bradford, Carbon, Centre, Chester and 30 more | 6 hr |
| Apr 19, 6:02 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Bradford, Carbon, Chester, Columbia and 21 more | 58 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2013Mesoscale Discussions in New Jersey, 2013Every mesoscale discussion 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.