Alert archive / Pennsylvania / Mesoscale Discussions in 2015
Mesoscale Discussion 1415
The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2015, 3:58 PM EDT for Allegany County, Garrett County, Washington County, Maryland; Allegany County, Cattaraugus County, Steuben County, New York; 16 counties in Pennsylvania. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Jul 14, 2015, 3:58 PM EDT (19:58 UTC)
- Expired
- Jul 14, 2015, 5:00 PM EDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 22 counties
Allegany County, MD, Garrett County, MD, Washington County, MD, Allegany County, NY, Cattaraugus County, NY, Steuben County, NY, Bedford County, PA, Blair County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Elk County, PA, Fulton County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, McKean County, PA, Mifflin County, PA, Potter County, PA, Somerset County, PA
The radar
The State College radar (KCCX), 55 km from the middle of the area, began a volume at 19:57 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
Pittsburgh, PA (KAGC), launched 12:00Z, 8.0 hours before the alert went out and 133 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
- 38 J/kg
- Mixed-layer CIN
- -234 J/kg
- Mixed-layer LCL
- 1071 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 169 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 |
|---|---|---|---|---|
| Jul 14, 12:40 PM EDT | Severe Thunderstorm Watch | SPC | Garrett | 7 hr |
| Jul 14, 6:44 PM EDT | Severe Thunderstorm Watch | SPC | Carroll, Charles, Frederick, Howard, Montgomery, Prince George's and 1 more | 4 hr |
| Jul 14, 11:44 AM EDT | Mesoscale Discussion | SPC | Beaver, Lawrence, Mercer | 61 min |
| Jul 14, 3:12 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 6 more | 93 min |
| Jul 14, 4:37 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 6 more | 83 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2015Mesoscale Discussions in Maryland, 2015Mesoscale Discussions in New York, 2015Every mesoscale discussion in 2015
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.