Alert archive / West Virginia / Mesoscale Discussions in 2020
Mesoscale Discussion 321
The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2020, 12:50 AM EDT for 13 counties in Virginia; 14 counties in West Virginia. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Apr 9, 2020, 12:50 AM EDT (04:50 UTC)
- Expired
- Apr 9, 2020, 2:45 AM EDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 27 counties
Alleghany County, VA, Bath County, VA, Bland County, VA, City of Covington, VA, City of Radford, VA, Craig County, VA, Giles County, VA, Highland County, VA, Montgomery County, VA, Pulaski County, VA, Roanoke County, VA, Tazewell County, VA, Wythe County, VA, Barbour County, WV, Doddridge County, WV, Greenbrier County, WV, Harrison County, WV, Lewis County, WV, Mercer County, WV, Monroe County, WV, Pendleton County, WV, Pocahontas County, WV, Randolph County, WV, Summers County, WV, Tucker County, WV, Upshur County, WV, Webster County, WV
The radar
The Charleston,WV radar (KRLX), 99 km from the middle of the area, began a volume at 04:52 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
Roanoke, VA (KRNK), launched 00:00Z, 4.8 hours before the alert went out and 153 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
- 1382 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 268 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 8, 10:14 PM EDT | Mesoscale Discussion | SPC | Buchanan, Dickenson, Wise, City of Norton | 3 hr |
| Apr 8, 10:51 PM EDT | Tornado Watch | SPC | Buchanan, Dickenson | 5 hr |
| Apr 8, 11:16 PM EDT | Severe Thunderstorm Watch | SPC | Lee, Russell, Scott, Washington, Wise, City of Bristol and 1 more | 6 hr |
| Apr 9, 2:03 AM EDT | Severe Thunderstorm Watch | SPC | Albemarle, Alleghany, Amherst, Augusta, Bath, Bedford and 37 more | 3 hr |
| Apr 9, 3:36 AM EDT | Mesoscale Discussion | SPC | Albemarle, Alleghany, Amherst, Augusta, Bath, Bedford and 40 more | 84 min |
| Apr 9, 12:01 PM EDT | Severe Thunderstorm Watch | SPC | Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church | 4 hr |
Nearby
Mesoscale 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.