Alert archive / Pennsylvania / Mesoscale Discussions in 2007
Mesoscale Discussion 1777
The Storm Prediction Center issued this mesoscale discussion at Aug 17, 2007, 1:13 PM EDT for 8 counties in New Jersey; 27 counties in Pennsylvania. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Aug 17, 2007, 1:13 PM EDT (17:13 UTC)
- Expired
- Aug 17, 2007, 2:45 PM EDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 35 counties
Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ, Warren County, NJ, Adams County, PA, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Delaware County, PA, Franklin County, PA, Huntingdon County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Mifflin County, PA, Montgomery County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Perry County, PA, Philadelphia County, PA, Schuylkill County, PA, Snyder County, PA, Union County, PA, York County, PA
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, 5.2 hours before the alert went out and 197 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
- 352 J/kg
- Mixed-layer CIN
- -115 J/kg
- Mixed-layer LCL
- 1022 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 |
|---|---|---|---|---|
| Aug 17, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more | 6 hr |
| Aug 17, 3:41 PM EDT | Mesoscale Discussion | SPC | Burlington, Camden, Essex, Gloucester, Hunterdon, Mercer and 6 more | 94 min |
| Aug 17, 6:04 PM EDT | Mesoscale Discussion | SPC | Bergen, Essex, Hudson, Hunterdon, Middlesex, Monmouth and 4 more | 116 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2007Mesoscale Discussions in New Jersey, 2007Every mesoscale discussion in 2007
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.