Alert archive / North Carolina / Mesoscale Discussions in 2008

Mesoscale Discussion 832

May 9, 20088 counties in North Carolina; Halifax County, City of Danville, Virginia

The Storm Prediction Center issued this mesoscale discussion at May 9, 2008, 12:06 AM EDT for 8 counties in North Carolina; Halifax County, City of Danville, Virginia. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 9, 2008, 12:06 AM EDT (04:06 UTC)
Expired: May 9, 2008, 1:00 AM EDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Alamance County, NC, Caswell County, NC, Durham County, NC, Granville County, NC, Guilford County, NC, Orange County, NC, Person County, NC, Rockingham County, NC, City of Danville, VA, Halifax County, VA

The radar

The Raleigh/Durham radar (KRAX), 107 km from the middle of the area, began a volume at 04:08 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.

Tornado Watch 286May 9, 3:00 AM EDT

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 4.1 hours before the alert went out and 64 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: 1104 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 995 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 184 m²/s²
0-3 km storm-relative helicity: 331 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 6.7

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
May 8, 8:38 PM EDT	Tornado Watch	SPC	Durham, Franklin, Granville, Lee, Vance, Wake and 1 more	6 hr
May 8, 9:47 PM EDT	Mesoscale Discussion	SPC	Alamance, Cabarrus, Caswell, Chatham, Davidson, Davie and 20 more	58 min
May 9, 2:32 AM EDT	Mesoscale Discussion	SPC	Alamance, Bertie, Camden, Caswell, Chatham, Chowan and 27 more	88 min
May 9, 3:00 AM EDT	Tornado Watch	SPC	Alamance, Beaufort, Bertie, Camden, Caswell, Chatham and 34 more	8 hr
May 9, 5:04 AM EDT	Mesoscale Discussion	SPC	Bertie, Camden, Chatham, Chowan, Currituck, Durham and 25 more	56 min
May 9, 5:56 AM EDT	Mesoscale Discussion	SPC	Brunswick, Columbus	2 hr
May 9, 6:37 AM EDT	Mesoscale Discussion	SPC	Bertie, Camden, Chowan, Currituck, Edgecombe, Franklin and 11 more	53 min
May 9, 8:29 AM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Camden, Carteret, Chowan, Craven and 18 more	61 min
May 9, 7:18 PM EDT	Mesoscale Discussion	SPC	Dickenson, Lee, Scott, Wise, City of Norton	57 min

Nearby

Mesoscale Discussions in North Carolina, 2008 Mesoscale Discussions in Virginia, 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.