Alert archive / North Carolina / Severe Thunderstorm Watches in 2010
Severe Thunderstorm Watch 577
The Storm Prediction Center issued this severe thunderstorm watch at Aug 5, 2010, 3:31 PM EDT for 31 counties in North Carolina. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 5, 2010, 3:31 PM EDT (19:31 UTC)
- Expired
- Aug 5, 2010, 8:41 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 31 counties
Alamance County, NC, Anson County, NC, Chatham County, NC, Cumberland County, NC, Davidson County, NC, Durham County, NC, Edgecombe County, NC, Forsyth County, NC, Franklin County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wayne County, NC, Wilson County, NC
The radar
The Roanoke radar (KFCX), 123 km from the middle of the area, began a volume at 19:32 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 4:18 PM EDT | Severe Thunderstorm Warning | RAH | Davidson | 57 min |
| Aug 5, 4:50 PM EDT | Severe Thunderstorm Warning | RAH | Davidson, Forsyth, Guilford | 40 min |
| Aug 5, 5:03 PM EDT | Severe Thunderstorm Warning | RAH | Person | 57 min |
| Aug 5, 5:13 PM EDT | Severe Thunderstorm Warning | RAH | Davidson, Randolph | 47 min |
| Aug 5, 5:28 PM EDT | Severe Thunderstorm Warning | RAH | Granville | 50 min |
| Aug 5, 5:30 PM EDT | Severe Thunderstorm Warning | RAH | Guilford | 43 min |
| Aug 5, 5:47 PM EDT | Severe Thunderstorm Warning | RAH | Alamance, Orange | 58 min |
| Aug 5, 6:06 PM EDT | Severe Thunderstorm Warning | RAH | Alamance, Orange | 39 min |
| Aug 5, 6:40 PM EDT | Severe Thunderstorm Warning | RAH | Durham, Granville, Orange | 50 min |
| Aug 5, 7:13 PM EDT | Severe Thunderstorm Warning | RAH | Wake | 47 min |
| Aug 5, 7:31 PM EDT | Severe Thunderstorm Warning | RAH | Edgecombe, Halifax, Nash, Wilson | 59 min |
| Aug 5, 7:54 PM EDT | Flash Flood Warning | RAH | Wake | 111 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, 7.5 hours before the alert went out and 20 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
- 2373 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 930 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 8:36 PM EDT | Severe Thunderstorm Watch | SPC | Bertie, Camden, Chowan, Currituck, Gates, Hertford and 3 more | 4 hr |
| Aug 4, 9:21 PM EDT | Mesoscale Discussion | SPC | Alamance, Caswell, Durham, Franklin, Granville, Guilford and 8 more | 84 min |
| Aug 5, 1:15 PM EDT | Mesoscale Discussion | SPC | Alexander, Alleghany, Ashe, Avery, Buncombe, Burke and 22 more | 90 min |
| Aug 5, 1:19 PM EDT | Severe Thunderstorm Watch | SPC | Alleghany, Ashe, Bertie, Camden, Caswell, Chowan and 12 more | 9 hr |
| Aug 5, 1:47 PM EDT | Severe Thunderstorm Watch | SPC | Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 23 more | 9 hr |
| Aug 5, 2:42 PM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Bladen, Cabarrus, Chatham, Cumberland and 29 more | 63 min |
| Aug 5, 5:52 PM EDT | Mesoscale Discussion | SPC | Graham, Madison, Mitchell, Swain, Yancey | 53 min |
| Aug 5, 6:23 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Ashe, Burke, Cabarrus and 40 more | 97 min |
| Aug 5, 7:35 PM EDT | Severe Thunderstorm Watch | SPC | Beaufort, Craven, Dare, Duplin, Greene, Hyde and 8 more | 3 hr |
| Aug 5, 8:51 AM EDT | Mesoscale Discussion | SPC | Buchanan, Dickenson, Lee, Russell, Tazewell, Wise and 1 more | 114 min |
| Aug 5, 10:38 AM EDT | Severe Thunderstorm Watch | SPC | Buchanan, Dickenson | 7 hr |
| Aug 5, 12:37 PM EDT | Mesoscale Discussion | SPC | Albemarle, Alleghany, Amelia, Amherst, Appomattox, Arlington and 84 more | 53 min |
| Aug 5, 3:56 PM EDT | Mesoscale Discussion | SPC | Accomack, Albemarle, Alleghany, Amelia, Amherst, Appomattox and 111 more | 64 min |
Nearby
Severe Thunderstorm Watches in North Carolina, 2010Every severe thunderstorm watch in 2010
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.