Alert archive / West Virginia / Mesoscale Discussions in 2014
Mesoscale Discussion 495
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2014, 5:01 PM EDT for Greene County, Washington County, Pennsylvania; 5 counties in Virginia; 18 counties in West Virginia. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2014, 5:01 PM EDT (21:01 UTC)
- Expired
- Apr 30, 2014, 6:30 PM EDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
All 25 counties
Greene County, PA, Washington County, PA, Buchanan County, VA, City of Bristol, VA, Russell County, VA, Tazewell County, VA, Washington County, VA, Braxton County, WV, Brooke County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Harrison County, WV, Lewis County, WV, Marion County, WV, Marshall County, WV, McDowell County, WV, Nicholas County, WV, Ohio County, WV, Raleigh County, WV, Tyler County, WV, Wetzel County, WV, Wyoming County, WV
The radar
The Charleston,WV radar (KRLX), 38 km from the middle of the area, began a volume at 21:04 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
Roanoke, VA (KRNK), launched 12:00Z, 9.0 hours before the alert went out and 195 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
- 452 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 292 m²/s²
- 0-3 km storm-relative helicity
- 371 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 5:22 AM EDT | Mesoscale Discussion | SPC | Amelia, Brunswick, Charles City, Chesterfield, Dinwiddie, Greensville and 15 more | 53 min |
| Apr 30, 12:33 PM EDT | Mesoscale Discussion | SPC | Brunswick, Charles City, Chesterfield, Dinwiddie, Gloucester, Greensville and 24 more | 87 min |
| Apr 30, 1:15 PM EDT | Tornado Watch | SPC | Amelia, Brunswick, Caroline, Charles City, Chesterfield, Dinwiddie and 41 more | 5 hr |
| Apr 30, 3:47 PM EDT | Mesoscale Discussion | SPC | Amelia, Brunswick, Caroline, Charles City, Chesterfield, Cumberland and 49 more | 88 min |
Nearby
Mesoscale Discussions in West Virginia, 2014Mesoscale Discussions in Virginia, 2014Mesoscale Discussions in Pennsylvania, 2014Every mesoscale discussion in 2014
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.