Alert archive / South Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 2229

September 17, 200412 counties in North Carolina; 13 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Sep 17, 2004, 1:51 AM EDT for 12 counties in North Carolina; 13 counties in South Carolina. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Sep 17, 2004, 1:51 AM EDT (05:51 UTC)
Expired
Sep 17, 2004, 3:15 AM EDT
In force
84 min
Issued by
the Storm Prediction Center
All 25 counties

Alexander County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Gaston County, NC, Iredell County, NC, Lincoln County, NC, McDowell County, NC, Mecklenburg County, NC, Polk County, NC, Rutherford County, NC, Aiken County, SC, Cherokee County, SC, Chester County, SC, Edgefield County, SC, Fairfield County, SC, Greenwood County, SC, Laurens County, SC, Lexington County, SC, Newberry County, SC, Saluda County, SC, Spartanburg County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 60 km from the middle of the area, began a volume at 05:52 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, 5.9 hours before the alert went out and 266 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, Charleston AFB, SC at 00:00Z on 2004-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2699 joules per kilogram.LCLEL10008507005003002001001 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, Charleston AFB, SC at 00:00Z on 2004-09-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 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
2699 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
481 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.7
Supercell composite
5.1

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 16, 8:45 PM EDTTornado WatchSPCCabarrus, Cleveland, Gaston, Lincoln, Mecklenburg, Polk and 1 more6 hr
Sep 16, 11:42 PM EDTMesoscale DiscussionSPCGaston, Mecklenburg2 hr
Sep 17, 9:26 AM EDTMesoscale DiscussionSPCAlamance, Anson, Bladen, Caswell, Chatham, Cumberland and 24 more2 hr
Sep 17, 10:10 AM EDTTornado WatchSPCAlamance, Anson, Bladen, Brunswick, Caswell, Chatham and 37 more7 hr
Sep 17, 11:03 AM EDTMesoscale DiscussionSPCAlamance, Bertie, Caswell, Chatham, Cumberland, Durham and 26 more87 min
Sep 17, 12:33 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Camden, Chowan, Craven, Gates and 8 more117 min
Sep 17, 1:15 PM EDTTornado WatchSPCBeaufort, Bertie, Camden, Carteret, Chowan, Craven and 18 more7 hr
Sep 17, 1:37 PM EDTMesoscale DiscussionSPCAlamance, Bladen, Brunswick, Caswell, Chatham, Columbus and 29 more113 min
Sep 17, 3:53 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Camden, Chowan, Craven, Edgecombe and 11 more2 hr
Sep 17, 4:01 PM EDTMesoscale DiscussionSPCBladen, Brunswick, Columbus, Cumberland, Duplin, Franklin and 6 more59 min
Sep 17, 4:35 PM EDTTornado WatchSPCBladen, Brunswick, Columbus, Duplin, Edgecombe, Franklin and 14 more3 hr
Sep 17, 6:19 PM EDTMesoscale DiscussionSPCBeaufort, Bertie, Camden, Chowan, Craven, Currituck and 13 more116 min
Sep 17, 6:50 PM EDTTornado WatchSPCBertie, Camden, Chowan, Currituck, Gates, Hertford and 3 more5 hr
Sep 17, 7:23 PM EDTMesoscale DiscussionSPCDuplin, Edgecombe, Greene, Halifax, Lenoir, Nash and 4 more37 min

Nearby

Mesoscale Discussions in South Carolina, 2004Mesoscale Discussions in North Carolina, 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.