Alert archive / North Carolina / Mesoscale Discussions in 2009

Mesoscale Discussion 732

May 6, 200938 counties in North Carolina; 8 counties in South Carolina; 13 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at May 6, 2009, 11:40 AM EDT for 38 counties in North Carolina; 8 counties in South Carolina; 13 counties in Virginia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2009, 11:40 AM EDT (15:40 UTC)
Expired
May 6, 2009, 1:45 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 59 counties

Alamance County, NC, Anson County, NC, Cabarrus County, NC, Caswell County, NC, Chatham County, NC, Cleveland County, NC, Davidson County, NC, Davie County, NC, Durham County, NC, Edgecombe County, NC, Forsyth County, NC, Franklin County, NC, Gaston County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Johnston County, NC, Lee County, NC, Lincoln County, NC, Martin County, NC, Mecklenburg County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, Northampton County, NC, Orange County, NC, Person County, NC, Randolph County, NC, Richmond County, NC, Rockingham County, NC, Rowan County, NC, Stanly County, NC, Union County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wilson County, NC, Cherokee County, SC, Chester County, SC, Greenville County, SC, Lancaster County, SC, Laurens County, SC, Spartanburg County, SC, Union County, SC, York County, SC, Brunswick County, VA, Charlotte County, VA, City of Danville, VA, City of Emporia, VA, Dinwiddie County, VA, Greensville County, VA, Halifax County, VA, Lunenburg County, VA, Mecklenburg County, VA, Nottoway County, VA, Prince Edward County, VA, Southampton County, VA, Sussex County, VA

The radar

The Raleigh/Durham radar (KRAX), 72 km from the middle of the area, began a volume at 15:40 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, 3.7 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2009-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2009-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
450 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
136 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
May 5, 8:43 PM EDTMesoscale DiscussionSPCAnson, Bertie, Chatham, Chowan, Cumberland, Durham and 30 more62 min
May 6, 8:47 AM EDTMesoscale DiscussionSPCScotland88 min
May 6, 2:16 PM EDTTornado WatchSPCAlamance, Alexander, Anson, Bertie, Buncombe, Burke and 52 more6 hr
May 6, 7:29 PM EDTMesoscale DiscussionSPCAlamance, Anson, Bertie, Cabarrus, Caswell, Chatham and 40 more91 min
May 6, 10:27 AM EDTTornado WatchSPCAnderson, Oconee, Pickens9 hr
May 6, 2:57 PM EDTMesoscale DiscussionSPCAbbeville93 min
May 6, 5:47 PM EDTMesoscale DiscussionSPCAiken, Allendale, Bamberg, Barnwell, Calhoun, Colleton and 9 more58 min

Nearby

Mesoscale Discussions in North Carolina, 2009Mesoscale Discussions in Virginia, 2009Mesoscale Discussions in South Carolina, 2009Every mesoscale discussion in 2009

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.