Alert archive / South Carolina / Mesoscale Discussions in 2017

Mesoscale Discussion 183

February 15, 20176 counties in Georgia; Columbus County, North Carolina; 14 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Feb 15, 2017, 10:19 AM EST for 6 counties in Georgia; Columbus County, North Carolina; 14 counties in South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Feb 15, 2017, 10:19 AM EST (15:19 UTC)
Expired
Feb 15, 2017, 12:45 PM EST
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 21 counties

Bryan County, GA, Bulloch County, GA, Candler County, GA, Effingham County, GA, Evans County, GA, Screven County, GA, Columbus County, NC, Allendale County, SC, Bamberg County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Marion County, SC, Williamsburg County, SC

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 3.3 hours before the alert went out and 48 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 12:00Z on 2017-02-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Charleston AFB, SC at 12:00Z on 2017-02-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1230 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
254 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 15, 11:23 AM ESTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Berrien, Brantley, Brooks and 16 more3 hr

Nearby

Mesoscale Discussions in South Carolina, 2017Mesoscale Discussions in Georgia, 2017Mesoscale Discussions in North Carolina, 2017Every mesoscale discussion in 2017

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.