Alert archive / North Carolina / Mesoscale Discussions in 2007
Mesoscale Discussion 1834
The Storm Prediction Center issued this mesoscale discussion at Aug 21, 2007, 4:56 PM EDT for 22 counties in North Carolina; Chesterfield County, Marlboro County, South Carolina. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 21, 2007, 4:56 PM EDT (20:56 UTC)
- Expired
- Aug 21, 2007, 7:30 PM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 24 counties
Anson County, NC, Bladen County, NC, Cabarrus County, NC, Cleveland County, NC, Cumberland County, NC, Duplin County, NC, Gaston County, NC, Harnett County, NC, Hoke County, NC, Lee County, NC, Lincoln County, NC, Mecklenburg County, NC, Montgomery County, NC, Moore County, NC, Onslow County, NC, Pender County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Union County, NC, Chesterfield County, SC, Marlboro County, SC
The radar
The Raleigh/Durham radar (KRAX), 106 km from the middle of the area, began a volume at 20:56 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 8.9 hours before the alert went out and 146 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
- 424 J/kg
- Mixed-layer CIN
- -155 J/kg
- Mixed-layer LCL
- 1462 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 21, 1:42 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Ashe, Avery, Buncombe and 29 more | 2 hr |
| Aug 21, 2:12 PM EDT | Severe Thunderstorm Watch | SPC | Alamance, Alexander, Alleghany, Ashe, Avery, Buncombe and 21 more | 5 hr |
| Aug 21, 3:51 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Beaufort, Bertie, Cabarrus, Caldwell and 50 more | 114 min |
| Aug 21, 4:23 PM EDT | Severe Thunderstorm Watch | SPC | Bertie, Camden, Chatham, Chowan, Currituck, Durham and 18 more | 7 hr |
| Aug 21, 6:10 PM EDT | Severe Thunderstorm Watch | SPC | Anson, Beaufort, Carteret, Craven, Cumberland, Dare and 18 more | 6 hr |
| Aug 21, 6:12 PM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 49 more | 2 hr |
Nearby
Mesoscale Discussions in North Carolina, 2007Mesoscale Discussions in South Carolina, 2007Every mesoscale discussion in 2007
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.