Alert archive / Pennsylvania / Mesoscale Discussions in 2024
Mesoscale Discussion 2249
The Storm Prediction Center issued this mesoscale discussion at Dec 5, 2024, 1:47 AM EST for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 5, 2024, 1:47 AM EST (06:47 UTC)
- Expired
- Dec 5, 2024, 5:45 AM EST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Snow squall
All 40 counties
Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Steuben County, NY, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Jefferson County, OH, Mahoning County, OH, Portage County, OH, Stark County, OH, Trumbull County, OH, Tuscarawas County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Cameron County, PA, Clarion County, PA, Clearfield 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, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Ohio County, WV
The radar
The Pittsburgh radar (KPBZ), 90 km from the middle of the area, began a volume at 06:49 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 (KPIT), launched 00:00Z, 6.8 hours before the alert went out and 100 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1193 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 513 m²/s²
- 0-3 km storm-relative helicity
- 538 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 |
|---|---|---|---|---|
| Dec 5, 9:50 AM EST | Mesoscale Discussion | SPC | Albany, Allegany, Broome, Cattaraugus, Cayuga, Chemung and 25 more | 2 hr |
Nearby
Mesoscale Discussions in Pennsylvania, 2024Mesoscale Discussions in Ohio, 2024Mesoscale Discussions in New York, 2024Every mesoscale discussion in 2024
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.