Alert archive / North Carolina / Mesoscale Discussions in 2006

Mesoscale Discussion 620

April 22, 20067 counties in Georgia; 30 counties in North Carolina; 21 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2006, 5:58 PM EDT for 7 counties in Georgia; 30 counties in North Carolina; 21 counties in South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 22, 2006, 5:58 PM EDT (21:58 UTC)
Expired
Apr 22, 2006, 8:00 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 58 counties

Appling County, GA, Bryan County, GA, Bulloch County, GA, Effingham County, GA, Evans County, GA, Screven County, GA, Tattnall County, GA, Bladen County, NC, Brunswick County, NC, Chatham County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Edgecombe County, NC, Franklin County, NC, Greene County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Moore County, NC, Nash County, NC, New Hanover County, NC, Onslow County, NC, Pender County, NC, Pitt County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Wake County, NC, Wayne County, NC, Wilson County, NC, Allendale County, SC, Bamberg County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Sumter County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 82 km from the middle of the area, began a volume at 21:59 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 nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 10.0 hours before the alert went out and 143 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, Charleston AFB, SC at 12:00Z on 2006-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2168 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, Charleston AFB, SC at 12:00Z on 2006-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 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
2168 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
556 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.4

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
Apr 21, 9:05 PM EDTMesoscale DiscussionSPCBaker, Baldwin, Barrow, Bibb, Butts, Calhoun and 61 more115 min
Apr 21, 9:21 PM EDTSevere Thunderstorm WatchSPCBaker, Banks, Barrow, Bibb, Butts, Calhoun and 61 more7 hr
Apr 22, 3:28 AM EDTMesoscale DiscussionSPCBaker, Ben Hill, Berrien, Bibb, Bleckley, Calhoun and 34 more62 min
Apr 22, 1:07 PM EDTMesoscale DiscussionSPCBaldwin, Barrow, Ben Hill, Bibb, Bleckley, Bulloch and 51 more83 min
Apr 22, 6:35 AM EDTMesoscale DiscussionSPCAlamance, Anson, Caswell, Chatham, Durham, Franklin and 17 more115 min
Apr 22, 8:28 AM EDTMesoscale DiscussionSPCAnson, Bladen, Chatham, Columbus, Cumberland, Harnett and 9 more92 min
Apr 22, 10:29 AM EDTSevere Thunderstorm WatchSPCAnson, Beaufort, Bertie, Bladen, Brunswick, Camden and 43 more8 hr

Nearby

Mesoscale Discussions in North Carolina, 2006Mesoscale Discussions in South Carolina, 2006Mesoscale Discussions in Georgia, 2006Every mesoscale discussion in 2006

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.