Alert archive / South Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 2173

September 6, 2004Richmond County, Georgia; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2004, 1:21 AM EDT for Richmond County, Georgia; 13 counties in South Carolina. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Sep 6, 2004, 1:21 AM EDT (05:21 UTC)
Expired: Sep 6, 2004, 2:45 AM EDT
In force: 84 min
Issued by: the Storm Prediction Center

Counties Richmond County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC, Hampton County, SC, Orangeburg County, SC

The radar

The Charleston,SC radar (KCLX), 89 km from the middle of the area, began a volume at 05:22 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, 5.4 hours before the alert went out and 51 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: 1206 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 493 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 202 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
Sep 5, 8:35 PM EDT	Tornado Watch	SPC	Atkinson, Bacon, Baker, Ben Hill, Berrien, Brantley and 33 more	9 hr
Sep 6, 12:12 AM EDT	Mesoscale Discussion	SPC	Atkinson, Bacon, Baker, Ben Hill, Berrien, Brantley and 33 more	2 hr
Sep 6, 4:06 AM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 39 more	84 min
Sep 6, 4:50 AM EDT	Tornado Watch	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 29 more	9 hr
Sep 6, 12:28 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 57 more	92 min
Sep 6, 1:00 PM EDT	Tornado Watch	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 49 more	7 hr
Sep 6, 3:55 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 43 more	2 hr
Sep 6, 7:12 PM EDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 26 more	2 hr
Sep 6, 7:45 PM EDT	Tornado Watch	SPC	Brantley, Bryan, Bulloch, Camden, Charlton, Chatham and 8 more	9 hr

Nearby

Mesoscale Discussions in South Carolina, 2004 Mesoscale Discussions in Georgia, 2004 Every mesoscale discussion in 2004

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.