Alert archive / South Carolina / Mesoscale Discussions in 2004

Mesoscale Discussion 2140

August 28, 2004Berkeley County, Georgetown County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2004, 8:57 PM EDT for Berkeley County, Georgetown County, South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 28, 2004, 8:57 PM EDT (00:57 UTC)
Expired
Aug 28, 2004, 11:00 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Berkeley County, SC, Georgetown County, SC

The radar

The Charleston,SC radar (KCLX), 114 km from the middle of the area, began a volume at 00:57 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, 1.0 hours before the alert went out and 25 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 2004-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1442 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 2004-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 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
1442 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
618 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
-19 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.

IssuedProductOfficeCountiesLasted
Aug 29, 2:30 PM EDTTornado WatchSPCChesterfield, Dillon, Horry, Marion, Marlboro8 hr
Aug 29, 6:33 PM EDTMesoscale DiscussionSPCChesterfield, Dillon, Horry, Marion, Marlboro117 min

Nearby

Mesoscale Discussions in South 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.