Alert archive / Pennsylvania / Mesoscale Discussions in 2025
Mesoscale Discussion 482
The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2025, 1:16 PM EDT for 4 counties in New York; 23 counties in Pennsylvania; Hancock County, West Virginia. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2025, 1:16 PM EDT (17:16 UTC)
- Expired
- Apr 19, 2025, 3:15 PM EDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
All 28 counties
Allegany County, NY, Chemung County, NY, Schuyler County, NY, Steuben County, NY, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Cameron County, PA, Centre County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Elk County, PA, Forest County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Montour County, PA, Potter County, PA, Tioga County, PA, Union County, PA, Venango County, PA, Warren County, PA, Hancock County, WV
The radar
The State College radar (KCCX), 82 km from the middle of the area, began a volume at 17:17 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
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.3 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
- 5 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 613 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 276 m²/s²
- 0-3 km storm-relative helicity
- 249 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Apr 19, 6:20 PM EDT | Mesoscale Discussion | SPC | Allegheny, Bedford, Blair, Cambria, Fayette, Franklin and 8 more | 85 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2025Mesoscale Discussions in New York, 2025Mesoscale Discussions in West Virginia, 2025Every mesoscale discussion in 2025
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.