Alert archive / Virginia / Mesoscale Discussions in 2014
Mesoscale Discussion 1573
The Storm Prediction Center issued this mesoscale discussion at Aug 18, 2014, 4:19 PM EDT for 10 counties in North Carolina; 29 counties in Virginia. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2014, 4:19 PM EDT (20:19 UTC)
- Expired
- Aug 18, 2014, 5:15 PM EDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 39 counties
Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Gates County, NC, Halifax County, NC, Hertford County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Charles City County, VA, Chesterfield County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Dinwiddie County, VA, Gloucester County, VA, Greensville County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, Mathews County, VA, Northampton County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA
The radar
The Norfolk radar (KAKQ), 17 km from the middle of the area, began a volume at 20:21 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
Newport, NC (KMHX), launched 12:00Z, 8.3 hours before the alert went out and 236 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
- 415 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1414 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.7
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 |
|---|---|---|---|---|
| Aug 18, 12:59 PM EDT | Mesoscale Discussion | SPC | Bertie, Camden, Chowan, Currituck, Gates, Halifax and 6 more | 91 min |
| Aug 18, 2:35 PM EDT | Severe Thunderstorm Watch | SPC | Bertie, Camden, Chowan, Currituck, Gates, Hertford and 3 more | 4 hr |
| Aug 18, 5:49 PM EDT | Mesoscale Discussion | SPC | Alamance, Bertie, Chatham, Davidson, Durham, Edgecombe and 17 more | 56 min |
Nearby
Mesoscale Discussions in Virginia, 2014Mesoscale Discussions in North Carolina, 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.