Alert archive / South Carolina / Mesoscale Discussions in 2011

Mesoscale Discussion 390

April 9, 201119 counties in North Carolina; 23 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2011, 7:59 PM EDT for 19 counties in North Carolina; 23 counties in South Carolina. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Apr 9, 2011, 7:59 PM EDT (23:59 UTC)
Expired
Apr 9, 2011, 9:00 PM EDT
In force
61 min
Issued by
the Storm Prediction Center
All 42 counties

Anson County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Catawba County, NC, Cleveland County, NC, Columbus County, NC, Gaston County, NC, Henderson County, NC, Lincoln County, NC, McDowell County, NC, Mecklenburg County, NC, Polk County, NC, Richmond County, NC, Robeson County, NC, Rutherford County, NC, Scotland County, NC, Union County, NC, Yancey County, NC, Calhoun County, SC, Cherokee County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Newberry County, SC, Richland County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, Williamsburg County, SC, York County, SC

The radar

The Columbia radar (KCAE), 95 km from the middle of the area, began a volume at 00:02 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, 12.0 hours before the alert went out and 172 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 2011-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 169 square meters per square second.19395878Sfc1 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
704 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
256 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
Apr 8, 9:10 PM EDTMesoscale DiscussionSPCAlamance, Caswell, Chatham, Davidson, Durham, Forsyth and 11 more65 min
Apr 8, 11:07 PM EDTSevere Thunderstorm WatchSPCAlleghany, Ashe, Rockingham, Stokes, Surry, Watauga and 2 more6 hr
Apr 9, 12:42 AM EDTMesoscale DiscussionSPCAlamance, Alexander, Alleghany, Ashe, Avery, Cabarrus and 23 more93 min
Apr 9, 3:23 AM EDTMesoscale DiscussionSPCAlexander, Alleghany, Ashe, Avery, Burke, Cabarrus and 19 more67 min
Apr 9, 12:34 PM EDTSevere Thunderstorm WatchSPCAlleghany, Ashe, Avery, Buncombe, Burke, Caldwell and 17 more4 hr
Apr 9, 2:00 PM EDTTornado WatchSPCAlleghany, Ashe, Avery, Buncombe, Burke, Caldwell and 17 more7 hr
Apr 9, 2:44 PM EDTSevere Thunderstorm WatchSPCAlexander, Anson, Cabarrus, Catawba, Cleveland, Davie and 7 more6 hr
Apr 9, 4:21 PM EDTMesoscale DiscussionSPCAshe, Avery, Buncombe, Burke, Caldwell, Cherokee and 15 more84 min
Apr 9, 5:36 PM EDTMesoscale DiscussionSPCCleveland, Gaston, Lincoln, Mecklenburg, Polk, Rutherford and 1 more54 min
Apr 9, 6:16 PM EDTTornado WatchSPCBuncombe, Burke, Cleveland, Gaston, Haywood, Henderson and 10 more6 hr
Apr 9, 1:34 PM EDTMesoscale DiscussionSPCAbbeville, Aiken, Allendale, Anderson, Bamberg, Barnwell and 17 more86 min

Nearby

Mesoscale Discussions in South Carolina, 2011Mesoscale Discussions in North Carolina, 2011Every mesoscale discussion in 2011

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.