Alert archive / North Carolina / Mesoscale Discussions in 2008

Mesoscale Discussion 1994

August 2, 200818 counties in North Carolina

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2008, 11:45 AM EDT for 18 counties in North Carolina. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued: Aug 2, 2008, 11:45 AM EDT (15:45 UTC)
Expired: Aug 2, 2008, 12:15 PM EDT
In force: 30 min
Issued by: the Storm Prediction Center

Counties Alamance County, NC, Cabarrus County, NC, Chatham County, NC, Davidson County, NC, Durham County, NC, Guilford County, NC, Harnett County, NC, Hoke County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Orange County, NC, Randolph County, NC, Richmond County, NC, Rockingham County, NC, Rowan County, NC, Stanly County, NC, Wake County, NC

The radar

The Raleigh/Durham radar (KRAX), 111 km from the middle of the area, began a volume at 15:49 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.

Severe Thunderstorm Watch 792Aug 2, 12:00 PM EDT

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 3.8 hours before the alert went out and 60 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 617 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1463 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 2, 12:02 PM EDT	Severe Thunderstorm Watch	SPC	Alamance, Alexander, Alleghany, Anson, Ashe, Burke and 50 more	8 hr
Aug 2, 2:30 PM EDT	Mesoscale Discussion	SPC	Alamance, Alexander, Alleghany, Anson, Ashe, Avery and 55 more	90 min
Aug 2, 6:26 PM EDT	Mesoscale Discussion	SPC	Alamance, Alexander, Alleghany, Anson, Ashe, Avery and 56 more	94 min
Aug 2, 7:22 PM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 25 more	6 hr

Nearby

Mesoscale Discussions in North Carolina, 2008 Every mesoscale discussion in 2008

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.