Alert archive / Pennsylvania / Mesoscale Discussions in 2012
Mesoscale Discussion 909
The Storm Prediction Center issued this mesoscale discussion at May 26, 2012, 2:08 PM EDT for 11 counties in New Jersey; 8 counties in New York; 16 counties in Pennsylvania. It was in force for 37 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2012, 2:08 PM EDT (18:08 UTC)
- Expired
- May 26, 2012, 2:45 PM EDT
- In force
- 37 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 35 counties
Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Middlesex County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Kings County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Richmond County, NY, Rockland County, NY, Westchester County, NY, Berks County, PA, Bucks County, PA, Carbon County, PA, Columbia County, PA, Dauphin 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, Pike County, PA, Schuylkill County, PA
The radar
The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 18:08 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, 6.1 hours before the alert went out and 169 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
- 144 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 659 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 105 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 |
|---|---|---|---|---|
| May 26, 1:17 PM EDT | Mesoscale Discussion | SPC | 88 min | |
| May 26, 2:29 PM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region, Naugatuck Valley Planning Region | 6 hr |
| May 26, 6:04 PM EDT | Mesoscale Discussion | SPC | 56 min | |
| May 25, 9:18 PM EDT | Mesoscale Discussion | SPC | Cayuga, Franklin, Hamilton, Herkimer, Jefferson, Lewis and 5 more | 117 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2012Mesoscale Discussions in New Jersey, 2012Mesoscale Discussions in New York, 2012Every mesoscale discussion in 2012
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.