Alert archive / South Carolina / Mesoscale Discussions in 2012

Mesoscale Discussion 2027

October 7, 2012Columbus County, Pender County, North Carolina; 8 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Oct 7, 2012, 4:25 PM EDT for Columbus County, Pender County, North Carolina; 8 counties in South Carolina. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Oct 7, 2012, 4:25 PM EDT (20:25 UTC)
Expired
Oct 7, 2012, 6:00 PM EDT
In force
95 min
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Columbus County, NC, Pender County, NC, Berkeley County, SC, Calhoun County, SC, Clarendon County, SC, Dorchester County, SC, Georgetown County, SC, Horry County, SC, Orangeburg County, SC, Williamsburg County, SC

The nearest sounding before it

Newport, NC (KMHX), launched 12:00Z, 8.4 hours before the alert went out and 237 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, Newport, NC at 12:00Z on 2012-10-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1104 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, Newport, NC at 12:00Z on 2012-10-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
1104 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
553 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Mesoscale Discussions in South Carolina, 2012Mesoscale Discussions in North Carolina, 2012Every mesoscale discussion in 2012

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.