Alert archive / North Carolina / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 483
The Storm Prediction Center issued this severe thunderstorm watch at Jul 9, 2012, 2:59 PM EDT for 51 counties in North Carolina; 27 counties in Virginia. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 9, 2012, 2:59 PM EDT (18:59 UTC)
- Expired
- Jul 9, 2012, 10:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 78 counties
Alamance County, NC, Beaufort County, NC, Bertie County, NC, Bladen County, NC, Camden County, NC, Carteret County, NC, Chatham County, NC, Chowan County, NC, Craven County, NC, Cumberland County, NC, Currituck County, NC, Dare County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Greene County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Hyde County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Moore County, NC, Nash County, NC, Northampton County, NC, Onslow County, NC, Orange County, NC, Pamlico County, NC, Pasquotank County, NC, Pender County, NC, Perquimans County, NC, Person County, NC, Pitt County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Tyrrell County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Amelia County, VA, Brunswick County, VA, Chesterfield County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, Cumberland County, VA, Dinwiddie County, VA, Greensville County, VA, Isle of Wight County, VA, Lunenburg County, VA, Mecklenburg County, VA, Nottoway County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA
The radar
The Raleigh/Durham radar (KRAX), 23 km from the middle of the area, began a volume at 19:00 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
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 3:02 PM EDT | Severe Thunderstorm Warning | RAH | Harnett, Lee | 43 min |
| Jul 9, 3:11 PM EDT | Severe Thunderstorm Warning | RAH | Cumberland, Harnett, Hoke | 34 min |
| Jul 9, 3:43 PM EDT | Severe Thunderstorm Warning | RAH | Cumberland | 33 min |
| Jul 9, 4:09 PM EDT | Severe Thunderstorm Warning | AKQ | Chowan, Gates, Perquimans | 51 min |
| Jul 9, 4:22 PM EDT | Severe Thunderstorm Warning | AKQ | Lunenburg, Prince Edward | 53 min |
| Jul 9, 4:28 PM EDT | Severe Thunderstorm Warning | MHX | Pitt | 62 min |
| Jul 9, 4:30 PM EDT | Severe Thunderstorm Warning | RAH | Durham | 45 min |
| Jul 9, 4:34 PM EDT | Severe Thunderstorm Warning | RAH | Anson, Richmond | 56 min |
| Jul 9, 4:41 PM EDT | Severe Thunderstorm Warning | RAH | Anson, Montgomery, Richmond, Stanly | 49 min |
| Jul 9, 4:56 PM EDT | Severe Thunderstorm Warning | AKQ | Perquimans | 27 min |
| Jul 9, 4:58 PM EDT | Severe Thunderstorm Warning | MHX | Beaufort | 62 min |
| Jul 9, 5:12 PM EDT | Severe Thunderstorm Warning | ILM | Bladen, Columbus, Robeson | 40 min |
| Jul 9, 5:25 PM EDT | Severe Thunderstorm Warning | RAH | Anson, Montgomery, Richmond, Stanly | 50 min |
| Jul 9, 5:31 PM EDT | Severe Thunderstorm Warning | MHX | Tyrrell, Washington | 59 min |
| Jul 9, 5:36 PM EDT | Severe Thunderstorm Warning | AKQ | Lunenburg, Nottoway, Prince Edward | 39 min |
| Jul 9, 5:56 PM EDT | Severe Thunderstorm Warning | RAH | Granville, Person, Vance | 49 min |
| Jul 9, 5:59 PM EDT | Severe Thunderstorm Warning | ILM | Bladen, Columbus, Robeson | 61 min |
| Jul 9, 7:05 PM EDT | Flash Flood Warning | RAH | Granville | 108 min |
| Jul 9, 7:28 PM EDT | Severe Thunderstorm Warning | RAH | Halifax, Warren | 47 min |
| Jul 9, 7:48 PM EDT | Flash Flood Warning | RAH | Alamance, Guilford | 3 hr |
| Jul 9, 8:52 PM EDT | Severe Thunderstorm Warning | AKQ | Gates | 23 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
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.0 hours before the alert went out and 156 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
- 1054 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 1186 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 31 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 9, 1:01 PM EDT | Mesoscale Discussion | SPC | Alexander, Avery, Buncombe, Burke, Caldwell, Catawba and 20 more | 89 min |
| Jul 9, 1:36 PM EDT | Mesoscale Discussion | SPC | Alamance, Beaufort, Bertie, Caswell, Chatham, Chowan and 35 more | 54 min |
| Jul 9, 3:19 PM EDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more | 4 hr |
| Jul 9, 4:48 PM EDT | Mesoscale Discussion | SPC | Anson, Beaufort, Bertie, Bladen, Camden, Chowan and 39 more | 87 min |
| Jul 9, 5:53 PM EDT | Mesoscale Discussion | SPC | Alamance, Alleghany, Caswell, Davie, Forsyth, Guilford and 7 more | 97 min |
| Jul 9, 7:17 PM EDT | Mesoscale Discussion | SPC | Alamance, Beaufort, Bertie, Brunswick, Camden, Carteret and 25 more | 88 min |
| Jul 9, 12:09 AM EDT | Mesoscale Discussion | SPC | Arlington, Caroline, Clarke, Culpeper, Fairfax, Fauquier and 21 more | 96 min |
Nearby
Severe Thunderstorm Watches in North Carolina, 2012Severe Thunderstorm Watches in Virginia, 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.