Alert archive / Virginia / Mesoscale Discussions in 2019
Mesoscale Discussion 111
The Storm Prediction Center issued this mesoscale discussion at Feb 20, 2019, 12:26 AM EST for 29 counties in Virginia; 10 counties in West Virginia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 20, 2019, 12:26 AM EST (05:26 UTC)
- Expired
- Feb 20, 2019, 4:30 AM EST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 39 counties
Alleghany County, VA, Amherst County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Carroll County, VA, City of Buena Vista, VA, City of Covington, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Highland County, VA, Montgomery County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Wythe County, VA, Greenbrier 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 Roanoke radar (KFCX), 79 km from the middle of the area, began a volume at 05:25 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
Washington/Dulle, VA (KIAD), launched 00:00Z, 5.4 hours before the alert went out and 288 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
- 2365 m above ground
- 0-6 km bulk shear
- 89 kt
- 0-1 km storm-relative helicity
- -51 m²/s²
- 0-3 km storm-relative helicity
- 82 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 |
|---|---|---|---|---|
| Feb 20, 5:55 AM EST | Mesoscale Discussion | SPC | Clarke, Frederick, Loudoun, Shenandoah, Warren, City of Winchester | 6 hr |
| Feb 20, 6:32 PM EST | Mesoscale Discussion | SPC | Augusta, Clarke, Fauquier, Frederick, Loudoun, Page and 7 more | 4 hr |
| Feb 20, 3:25 AM EST | Mesoscale Discussion | SPC | Brooke, Hancock, Jackson, Marshall, Mason, Ohio and 2 more | 6 hr |
Nearby
Mesoscale Discussions in Virginia, 2019Mesoscale Discussions in West Virginia, 2019Every mesoscale discussion in 2019
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.