Alert archive / Pennsylvania / Mesoscale Discussions in 2017
Mesoscale Discussion 1135
The Storm Prediction Center issued this mesoscale discussion at Jun 23, 2017, 3:35 PM EDT for 10 counties in New Jersey; 12 counties in Pennsylvania. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Jun 23, 2017, 3:35 PM EDT (19:35 UTC)
- Expired
- Jun 23, 2017, 5:30 PM EDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 22 counties
Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Pike County, PA
The radar
The Philadelphia radar (KDIX), 90 km from the middle of the area, began a volume at 19:37 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
Brookhaven, NY (KOKX), launched 12:00Z, 7.6 hours before the alert went out and 198 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
- 688 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 1159 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
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 |
|---|---|---|---|---|
| Jun 23, 5:09 PM EDT | Severe Thunderstorm Watch | SPC | Bergen, Essex, Hudson, Hunterdon, Mercer, Middlesex and 7 more | 4 hr |
| Jun 23, 1:15 PM EDT | Mesoscale Discussion | SPC | Allegheny, Beaver, Greene, Lawrence, Washington | 2 hr |
| Jun 23, 2:20 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Allegheny, Bedford, Blair, Cambria, Cumberland and 19 more | 8 hr |
| Jun 23, 4:53 PM EDT | Mesoscale Discussion | SPC | Adams, Bedford, Cumberland, Dauphin, Fayette, Franklin and 8 more | 2 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2017Mesoscale Discussions in New Jersey, 2017Every mesoscale discussion in 2017
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.