Alert archive / West Virginia / Mesoscale Discussions in 2018
Mesoscale Discussion 1332
The Storm Prediction Center issued this mesoscale discussion at Aug 21, 2018, 12:45 PM EDT for 4 counties in Pennsylvania; 36 counties in West Virginia. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 21, 2018, 12:45 PM EDT (16:45 UTC)
- Expired
- Aug 21, 2018, 3:15 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 40 counties
Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA, Barbour County, WV, Boone County, WV, Braxton County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Greenbrier County, WV, Harrison County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Marion County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monongalia County, WV, Nicholas County, WV, Pocahontas County, WV, Preston County, WV, Putnam County, WV, Raleigh County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Summers County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Upshur County, WV, Wayne County, WV, Webster County, WV, Wetzel County, WV, Wyoming County, WV
The radar
The Charleston,WV radar (KRLX), 106 km from the middle of the area, began a volume at 16:47 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 (KAGC), launched 12:00Z, 4.8 hours before the alert went out and 178 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
- 340 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 811 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.5
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 |
|---|---|---|---|---|
| Aug 21, 2:16 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Bedford, Blair, Cambria, Clarion and 7 more | 119 min |
| Aug 21, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Armstrong, Bedford, Blair, Cambria, Centre and 16 more | 7 hr |
| Aug 21, 4:56 PM EDT | Mesoscale Discussion | SPC | Adams, Armstrong, Bedford, Blair, Cambria, Centre and 16 more | 2 hr |
| Aug 21, 7:06 PM EDT | Mesoscale Discussion | SPC | Adams, Berks, Chester, Cumberland, Dauphin, Franklin and 5 more | 84 min |
Nearby
Mesoscale Discussions in West Virginia, 2018Mesoscale Discussions in Pennsylvania, 2018Every mesoscale discussion in 2018
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.