Alert archive / South Carolina / Mesoscale Discussions in 2009

Mesoscale Discussion 443

April 11, 2009Effingham County, Screven County, Georgia; 17 counties in North Carolina; 18 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2009, 1:48 AM EDT for Effingham County, Screven County, Georgia; 17 counties in North Carolina; 18 counties in South Carolina. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2009, 1:48 AM EDT (05:48 UTC)
Expired: Apr 11, 2009, 2:45 AM EDT
In force: 57 min
Issued by: the Storm Prediction Center

All 37 counties

Effingham County, GA, Screven County, GA, Beaufort County, NC, Bladen County, NC, Brunswick County, NC, Columbus County, NC, Craven County, NC, Duplin County, NC, Greene County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pender County, NC, Pitt County, NC, Sampson County, NC, Wayne County, NC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Marion County, SC, Orangeburg County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 120 km from the middle of the area, began a volume at 05:50 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 00:00Z, 5.8 hours before the alert went out and 86 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1295 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 258 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.

Issued	Product	Office	Counties	Lasted
Apr 10, 8:54 PM EDT	Mesoscale Discussion	SPC	Burke, Columbia, Jenkins, Lincoln, McDuffie, Richmond and 1 more	66 min
Apr 10, 9:24 PM EDT	Tornado Watch	SPC	Burke	5 hr
Apr 10, 10:28 PM EDT	Mesoscale Discussion	SPC	Baldwin, Bibb, Bleckley, Butts, Chattahoochee, Clayton and 55 more	92 min
Apr 10, 11:11 PM EDT	Tornado Watch	SPC	Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 22 more	4 hr
Apr 10, 11:20 PM EDT	Severe Thunderstorm Watch	SPC	Bulloch, Candler, Effingham, Evans, Jenkins, Screven and 1 more	6 hr
Apr 11, 12:49 AM EDT	Mesoscale Discussion	SPC	Bibb, Bleckley, Burke, Candler, Crawford, Dodge and 25 more	56 min
Apr 11, 2:44 AM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 16 more	31 min

Nearby

Mesoscale Discussions in South Carolina, 2009 Mesoscale Discussions in North Carolina, 2009 Mesoscale Discussions in Georgia, 2009 Every 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.