Alert archive / Pennsylvania / Mesoscale Discussions in 2020
Mesoscale Discussion 1632
The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2020, 3:56 PM EDT for 9 counties in New Jersey; Orange County, New York; 27 counties in Pennsylvania. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 29, 2020, 3:56 PM EDT (19:56 UTC)
- Expired
- Aug 29, 2020, 6:00 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
All 37 counties
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, Orange County, NY, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Columbia County, PA, Cumberland County, PA, Dauphin 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, Union County, PA, Wayne County, PA, Wyoming County, PA, York County, PA
The radar
The Philadelphia radar (KDIX), 160 km from the middle of the area, began a volume at 20:00 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.9 hours before the alert went out and 224 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
- 584 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 497 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.6
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 12:08 PM EDT | Mesoscale Discussion | SPC | Atlantic, Cape May, Cumberland, Salem | 3 hr |
| Aug 29, 6:45 PM EDT | Mesoscale Discussion | SPC | Bergen, Essex, Hudson, Hunterdon, Mercer, Middlesex and 6 more | 2 hr |
| Aug 29, 1:36 PM EDT | Mesoscale Discussion | SPC | Albany, Chenango, Columbia, Delaware, Dutchess, Essex and 16 more | 114 min |
| Aug 29, 2:59 PM EDT | Severe Thunderstorm Watch | SPC | Albany, Clinton, Columbia, Delaware, Essex, Franklin and 13 more | 6 hr |
| Aug 29, 4:52 PM EDT | Mesoscale Discussion | SPC | Montgomery, Rensselaer, Saratoga, Schenectady, Washington | 53 min |
| Aug 29, 7:13 PM EDT | Severe Thunderstorm Watch | SPC | Dutchess, Ulster | 3 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2020Mesoscale Discussions in New Jersey, 2020Mesoscale Discussions in New York, 2020Every mesoscale discussion in 2020
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.