Alert archive / South Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 2267

September 27, 2004Bryan County, Chatham County, Effingham County, Georgia; 7 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2004, 7:38 AM EDT for Bryan County, Chatham County, Effingham County, Georgia; 7 counties in South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 27, 2004, 7:38 AM EDT (11:38 UTC)
Expired: Sep 27, 2004, 9:45 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Bryan County, GA, Chatham County, GA, Effingham County, GA, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 41 km from the middle of the area, began a volume at 11:39 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.

Tornado Watch 843Sep 27, 10:40 AM EDT

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 11.6 hours before the alert went out and 61 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: 813 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 454 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 173 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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 27, 12:35 AM EDT	Tornado Watch	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 36 more	8 hr
Sep 27, 4:47 AM EDT	Mesoscale Discussion	SPC	Appling, Ben Hill, Bryan, Bulloch, Candler, Chatham and 15 more	118 min
Sep 27, 10:27 AM EDT	Mesoscale Discussion	SPC	Baldwin, Bryan, Bulloch, Burke, Camden, Candler and 28 more	2 hr
Sep 27, 10:40 AM EDT	Tornado Watch	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 12 more	6 hr
Sep 27, 6:05 PM EDT	Mesoscale Discussion	SPC	Banks, Franklin, Habersham, Hart, Madison, Rabun and 1 more	115 min
Sep 26, 9:53 PM EDT	Mesoscale Discussion	SPC	Beaufort, Berkeley, Charleston, Colleton, Dorchester, Hampton and 1 more	2 hr
Sep 27, 3:24 PM EDT	Mesoscale Discussion	SPC	Bamberg, Berkeley, Calhoun, Chesterfield, Clarendon, Colleton and 15 more	96 min
Sep 27, 3:50 PM EDT	Tornado Watch	SPC	Bamberg, Berkeley, Calhoun, Charleston, Chesterfield, Clarendon and 17 more	6 hr
Sep 27, 6:31 PM EDT	Mesoscale Discussion	SPC	Berkeley, Calhoun, Chester, Chesterfield, Clarendon, Darlington and 16 more	119 min

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.