Alert archive / Pennsylvania / Mesoscale Discussions in 2012
Mesoscale Discussion 1426
The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2012, 1:48 PM EDT for 4 states. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Jul 7, 2012, 1:48 PM EDT (17:48 UTC)
- Expired
- Jul 7, 2012, 2:45 PM EDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 31 counties
Cattaraugus County, NY, Carroll County, OH, Columbiana County, OH, Holmes County, OH, Mahoning County, OH, Medina County, OH, Portage County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Wayne County, OH, Armstrong County, PA, Beaver County, PA, Butler County, PA, Cameron County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Crawford County, PA, Elk County, PA, Forest County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, McKean County, PA, Mercer County, PA, Potter County, PA, Venango County, PA, Warren County, PA, Hancock County, WV
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 5.8 hours before the alert went out and 112 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
- 326 J/kg
- Mixed-layer CIN
- -226 J/kg
- Mixed-layer LCL
- 1593 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
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 |
|---|---|---|---|---|
| Jul 7, 11:19 AM EDT | Mesoscale Discussion | SPC | Bronx, Broome, Delaware, Dutchess, Greene, Kings and 10 more | 86 min |
| Jul 7, 11:41 AM EDT | Severe Thunderstorm Watch | SPC | Bronx, Dutchess, Kings, Nassau, New York, Orange and 8 more | 7 hr |
| Jul 7, 1:36 PM EDT | Mesoscale Discussion | SPC | Bronx, Dutchess, Kings, Nassau, New York, Orange and 8 more | 84 min |
| Jul 7, 3:57 PM EDT | Mesoscale Discussion | SPC | Bronx, Kings, Nassau, New York, Orange, Putnam and 6 more | 2 hr |
| Jul 7, 5:43 PM EDT | Mesoscale Discussion | SPC | Bronx, Kings, Nassau, New York, Queens, Richmond | 62 min |
| Jul 7, 2:16 PM EDT | Severe Thunderstorm Watch | SPC | Ashland, Belmont, Carroll, Columbiana, Coshocton, Guernsey and 13 more | 5 hr |
| Jul 7, 6:59 PM EDT | Severe Thunderstorm Watch | SPC | Belmont, Carroll, Columbiana, Harrison, Jefferson, Tuscarawas | 3 hr |
| Jul 7, 6:14 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bedford, Berks, Blair, Bucks, Cambria and 29 more | 3 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2012Mesoscale Discussions in Ohio, 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.