Alert archive / West Virginia / Mesoscale Discussions in 2017
Mesoscale Discussion 526
The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2017, 2:40 PM EDT for 4 states. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2017, 2:40 PM EDT (18:40 UTC)
- Expired
- Apr 20, 2017, 3:45 PM EDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 81 counties
Allegany County, MD, Garrett County, MD, Washington County, MD, Ashtabula County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Cuyahoga County, OH, Geauga County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Jefferson County, OH, Lake County, OH, Mahoning County, OH, Medina County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Portage County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Washington County, OH, Wayne County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Clarion County, PA, Clearfield County, PA, Crawford County, PA, Elk County, PA, Fayette County, PA, Forest County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Somerset County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Westmoreland County, PA, Barbour County, WV, Berkeley County, WV, Brooke County, WV, Doddridge County, WV, Gilmer County, WV, Grant County, WV, Hampshire County, WV, Hancock County, WV, Harrison County, WV, Jefferson County, WV, Lewis 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, Ritchie County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV
The radar
The Pittsburgh radar (KPBZ), 24 km from the middle of the area, began a volume at 18:43 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, 6.7 hours before the alert went out and 33 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
- 59 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 791 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 186 m²/s²
- 0-3 km storm-relative helicity
- 182 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 20, 1:36 PM EDT | Mesoscale Discussion | SPC | Allen, Ashland, Auglaize, Champaign, Crawford, Darke and 27 more | 84 min |
| Apr 20, 2:08 PM EDT | Severe Thunderstorm Watch | SPC | Allen, Ashland, Auglaize, Crawford, Defiance, Erie and 22 more | 6 hr |
| Apr 20, 4:31 PM EDT | Mesoscale Discussion | SPC | Allen, Auglaize, Champaign, Crawford, Darke, Defiance and 28 more | 119 min |
| Apr 20, 7:01 PM EDT | Mesoscale Discussion | SPC | Allen, Auglaize, Crawford, Defiance, Erie, Fulton and 19 more | 59 min |
Nearby
Mesoscale Discussions in West Virginia, 2017Mesoscale Discussions in Pennsylvania, 2017Mesoscale Discussions in Ohio, 2017Every mesoscale discussion in 2017
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.