Alert archive / North Carolina / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 513
The Storm Prediction Center issued this severe thunderstorm watch at Jul 24, 2012, 4:24 PM EDT for 30 counties in North Carolina; 4 counties in South Carolina; 26 counties in Virginia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 24, 2012, 4:24 PM EDT (20:24 UTC)
- Expired
- Jul 24, 2012, 8:35 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 60 counties
Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Camden County, NC, Carteret County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Currituck County, NC, Dare County, NC, Duplin County, NC, Gates County, NC, Greene County, NC, Hertford County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, New Hanover County, NC, Northampton County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Pitt County, NC, Robeson County, NC, Tyrrell County, NC, Washington County, NC, Dillon County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, Accomack County, VA, Brunswick County, VA, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, 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, 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 Raleigh/Durham radar (KRAX), 70 km from the middle of the area, began a volume at 20:26 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 4:30 PM EDT | Severe Thunderstorm Warning | MHX | Duplin, Greene, Lenoir, Martin, Pitt | 60 min |
| Jul 24, 4:44 PM EDT | Severe Thunderstorm Warning | AKQ | Gloucester, James City, Mathews, Surry, York, City of Hampton and 3 more | 46 min |
| Jul 24, 4:46 PM EDT | Severe Thunderstorm Warning | MHX | Beaufort, Craven, Duplin, Greene, Jones, Lenoir and 4 more | 59 min |
| Jul 24, 5:14 PM EDT | Severe Thunderstorm Warning | AKQ | Isle of Wight, City of Hampton, City of Newport News, City of Norfolk | 31 min |
| Jul 24, 5:20 PM EDT | Severe Thunderstorm Warning | AKQ | Bertie, Chowan | 40 min |
| Jul 24, 5:26 PM EDT | Severe Thunderstorm Warning | MHX | Duplin, Onslow | 49 min |
| Jul 24, 5:47 PM EDT | Severe Thunderstorm Warning | MHX | Beaufort, Craven, Dare, Hyde, Jones, Onslow and 3 more | 58 min |
| Jul 24, 5:53 PM EDT | Severe Thunderstorm Warning | AKQ | Chowan, Pasquotank, Perquimans | 52 min |
| Jul 24, 6:04 PM EDT | Severe Thunderstorm Warning | MHX | Carteret | 56 min |
| Jul 24, 6:28 PM EDT | Severe Thunderstorm Warning | MHX | Dare | 32 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Newport, NC (KMHX), launched 12:00Z, 8.4 hours before the alert went out and 108 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
- 1601 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 888 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 199 m²/s²
- 0-3 km storm-relative helicity
- 232 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 1:08 PM EDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more | 6 hr |
| Jul 24, 1:12 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Anson, Avery, Buncombe, Burke and 37 more | 93 min |
| Jul 24, 1:42 PM EDT | Mesoscale Discussion | SPC | Bertie, Camden, Chowan, Currituck, Gates, Halifax and 8 more | 2 hr |
| Jul 24, 2:36 PM EDT | Severe Thunderstorm Watch | SPC | Alamance, Alexander, Anson, Avery, Buncombe, Burke and 53 more | 5 hr |
| Jul 24, 3:46 PM EDT | Mesoscale Discussion | SPC | Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 40 more | 89 min |
| Jul 24, 6:46 PM EDT | Mesoscale Discussion | SPC | Calhoun, Clarendon, Lee, Lexington, Richland, Saluda and 1 more | 89 min |
| Jul 24, 11:43 AM EDT | Mesoscale Discussion | SPC | Buchanan, Dickenson, Wise, City of Norton | 62 min |
| Jul 24, 11:48 AM EDT | Mesoscale Discussion | SPC | Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 22 more | 87 min |
| Jul 24, 12:33 PM EDT | Severe Thunderstorm Watch | SPC | Buchanan, Dickenson, Lee, Russell, Scott, Washington and 3 more | 6 hr |
| Jul 24, 1:52 PM EDT | Mesoscale Discussion | SPC | Buchanan, Dickenson, Wise, City of Norton | 53 min |
| Jul 24, 3:25 PM EDT | Mesoscale Discussion | SPC | Buchanan, Dickenson, Lee, Russell, Scott, Smyth and 5 more | 95 min |
Nearby
Severe Thunderstorm Watches in North Carolina, 2012Severe Thunderstorm Watches in Virginia, 2012Severe Thunderstorm Watches in South Carolina, 2012Every severe thunderstorm watch in 2012
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.