Alert archive / Georgia / Mesoscale Discussions in 2004

Mesoscale Discussion 2266

September 27, 200421 counties in Georgia; Beaufort County, Jasper County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2004, 4:47 AM EDT for 21 counties in Georgia; Beaufort County, Jasper County, South Carolina. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Sep 27, 2004, 4:47 AM EDT (08:47 UTC)
Expired: Sep 27, 2004, 6:45 AM EDT
In force: 118 min
Issued by: the Storm Prediction Center

All 23 counties

Appling County, GA, Ben Hill County, GA, Bryan County, GA, Bulloch County, GA, Candler County, GA, Chatham County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Jeff Davis County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Montgomery County, GA, Tattnall County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Wayne County, GA, Wheeler County, GA, Beaufort County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 116 km from the middle of the area, began a volume at 08:46 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

Jacksonville, FL (KJAX), launched 00:00Z, 8.8 hours before the alert went out and 159 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: 135 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 465 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 95 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 27, 12:35 AM EDT	Tornado Watch	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 36 more	8 hr
Sep 27, 7:38 AM EDT	Mesoscale Discussion	SPC	Bryan, Chatham, Effingham	2 hr
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 Georgia, 2004 Mesoscale Discussions in South Carolina, 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.