Alert archive / Pennsylvania / Mesoscale Discussions in 2020
Mesoscale Discussion 798
The Storm Prediction Center issued this mesoscale discussion at Jun 3, 2020, 3:10 PM EDT for 5 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 3, 2020, 3:10 PM EDT (19:10 UTC)
- Expired
- Jun 3, 2020, 5:15 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch possible
- Chance of a watch
- 40%
All 92 counties
Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Frederick County, MD, Garrett County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Washington County, MD, Belmont County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Washington County, OH, Adams County, PA, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Elk County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Juniata County, PA, Lancaster County, PA, Lebanon County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Somerset County, PA, Union County, PA, Washington County, PA, Westmoreland County, PA, York County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Manassas, VA, City of Manassas Park, VA, City of Winchester, VA, Clarke County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Loudoun County, VA, Page County, VA, Rappahannock County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Brooke County, WV, Grant County, WV, Hampshire County, WV, Hancock County, WV, Hardy County, WV, Jefferson County, WV, Marion County, WV, Marshall County, WV, Mineral County, WV, Monongalia County, WV, Morgan County, WV, Ohio County, WV, Pleasants County, WV, Preston County, WV, Tyler County, WV, Wetzel County, WV
The radar
The Pittsburgh radar (KPBZ), 94 km from the middle of the area, began a volume at 19:11 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
Pittsburgh, PA (KPIT), launched 12:00Z, 7.2 hours before the alert went out and 78 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
- 1411 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 192 m²/s²
- 0-3 km storm-relative helicity
- 299 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
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 |
|---|---|---|---|---|
| Jun 3, 10:08 AM EDT | Severe Thunderstorm Watch | SPC | Cecil, Harford | 4 hr |
| Jun 3, 11:34 AM EDT | Mesoscale Discussion | SPC | Baltimore, Carroll, Cecil, Harford, Kent, City of Baltimore | 86 min |
| Jun 3, 3:52 PM EDT | Severe Thunderstorm Watch | SPC | Cecil | 6 hr |
| Jun 3, 5:12 AM EDT | Mesoscale Discussion | SPC | Ashtabula, Geauga, Lake | 2 hr |
| Jun 3, 6:24 PM EDT | Mesoscale Discussion | SPC | Adams, Athens, Brown, Butler, Clermont, Clinton and 17 more | 3 hr |
| Jun 2, 9:26 PM EDT | Mesoscale Discussion | SPC | McKean, Potter, Tioga, Warren | 3 hr |
| Jun 3, 8:32 AM EDT | Mesoscale Discussion | SPC | Adams, Armstrong, Berks, Blair, Bradford, Butler and 38 more | 118 min |
| Jun 3, 6:58 PM EDT | Mesoscale Discussion | SPC | Lackawanna, Monroe, Northampton, Pike, Susquehanna, Wayne and 1 more | 92 min |
| Jun 3, 7:44 PM EDT | Mesoscale Discussion | SPC | Berks, Bucks, Chester, Cumberland, Dauphin, Delaware and 6 more | 91 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2020Mesoscale Discussions in West Virginia, 2020Mesoscale Discussions in Virginia, 2020Every mesoscale discussion in 2020
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.