Alert archive / Pennsylvania / Mesoscale Discussions in 2011
Mesoscale Discussion 815
The Storm Prediction Center issued this mesoscale discussion at May 19, 2011, 5:02 PM EDT for 15 counties in New Jersey; 12 counties in New York; 18 counties in Pennsylvania. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- May 19, 2011, 5:02 PM EDT (21:02 UTC)
- Expired
- May 19, 2011, 6:00 PM EDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 45 counties
Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Albany County, NY, Chenango County, NY, Delaware County, NY, Greene County, NY, New York County, NY, Orange County, NY, Otsego County, NY, Richmond County, NY, Rockland County, NY, Schoharie County, NY, Sullivan County, NY, Ulster County, NY, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Dauphin County, PA, Delaware County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Pike County, PA, Schuylkill County, PA, Wayne County, PA, York County, PA
The radar
The Philadelphia radar (KDIX), 134 km from the middle of the area, began a volume at 21:03 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 nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.0 hours before the alert went out and 181 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
- 143 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 819 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
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 |
|---|---|---|---|---|
| May 19, 10:47 AM EDT | Mesoscale Discussion | SPC | Bergen, Essex, Hudson, Hunterdon, Mercer, Middlesex and 6 more | 88 min |
| May 19, 12:20 PM EDT | Severe Thunderstorm Watch | SPC | Bergen, Burlington, Camden, Essex, Gloucester, Hudson and 9 more | 8 hr |
| May 19, 2:17 PM EDT | Mesoscale Discussion | SPC | Atlantic, Bergen, Burlington, Camden, Cumberland, Essex and 12 more | 58 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2011Mesoscale Discussions in New Jersey, 2011Mesoscale Discussions in New York, 2011Every mesoscale discussion in 2011
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.