Alert archive / South Carolina / Mesoscale Discussions in 2006

Mesoscale Discussion 539

April 17, 20067 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2006, 6:26 PM EDT for 7 counties in South Carolina. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Apr 17, 2006, 6:26 PM EDT (22:26 UTC)
Expired: Apr 17, 2006, 8:00 PM EDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Darlington County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Lee County, SC, Marion County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 34 km from the middle of the area, began a volume at 22:26 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

Newport, NC (KMHX), launched 12:00Z, 10.4 hours before the alert went out and 199 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: 9 J/kg
Mixed-layer CIN: -484 J/kg
Mixed-layer LCL: 1330 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 115 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 17, 1:37 PM EDT	Mesoscale Discussion	SPC	Cherokee, Chester, Chesterfield, Darlington, Dillon, Fairfield and 13 more	113 min
Apr 17, 2:10 PM EDT	Severe Thunderstorm Watch	SPC	Chesterfield, Darlington, Dillon, Florence, Georgetown, Horry and 6 more	5 hr
Apr 17, 4:56 PM EDT	Mesoscale Discussion	SPC	Darlington, Dillon, Florence, Horry, Kershaw, Lancaster and 2 more	64 min

Nearby

Mesoscale Discussions in South Carolina, 2006 Every 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.