Alert archive / South Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 2180

September 7, 20047 counties in Florida; 14 counties in Georgia; 16 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 7, 2004, 3:22 AM EDT for 7 counties in Florida; 14 counties in Georgia; 16 counties in South Carolina. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Sep 7, 2004, 3:22 AM EDT (07:22 UTC)
Expired
Sep 7, 2004, 4:45 AM EDT
In force
83 min
Issued by
the Storm Prediction Center
All 37 counties

Bradford County, FL, Clay County, FL, Duval County, FL, Flagler County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Screven County, GA, Wayne County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort 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, Jasper County, SC, Orangeburg County, SC, Williamsburg County, SC

The radar

The Jacksonville radar (KJAX), 87 km from the middle of the area, began a volume at 07:25 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 7.4 hours before the alert went out and 85 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-pSkew-T log-p diagram, Jacksonville, FL at 00:00Z on 2004-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 307 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 00:00Z on 2004-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
307 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
785 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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.

IssuedProductOfficeCountiesLasted
Sep 7, 12:30 AM EDTMesoscale DiscussionSPCBradford, Clay, Duval, Flagler, Nassau, Putnam and 1 more2 hr
Sep 7, 4:00 AM EDTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 15 more10 hr
Sep 7, 5:30 AM EDTMesoscale DiscussionSPCFannin, Gilmer, Murray, Rabun, Towns, Union3 hr
Sep 7, 7:34 AM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 15 more116 min
Sep 7, 11:29 AM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Columbia, Effingham and 28 more91 min
Sep 7, 11:55 AM EDTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 12 more7 hr
Sep 7, 3:19 PM EDTMesoscale DiscussionSPCAppling, Bryan, Bulloch, Burke, Candler, Chatham and 28 more116 min
Sep 7, 6:07 PM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Columbia, Effingham, Jenkins and 4 more53 min
Sep 7, 6:40 PM EDTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more6 hr
Sep 7, 1:45 PM EDTTornado WatchSPCHorry5 hr

Nearby

Mesoscale Discussions in South Carolina, 2004Mesoscale Discussions in Georgia, 2004Mesoscale Discussions in Florida, 2004Every 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.