Alert archive / South Carolina / Areal Flood Advisories in 2012

Areal Flood Advisory 71, NWS Columbia, SC

August 29, 2012Clarendon County, Lee County, Sumter County, South Carolina

NWS Columbia, SC issued this areal flood advisory at Aug 29, 2012, 3:52 PM EDT for Clarendon County, Lee County, Sumter County, South Carolina. It was in force for 53 min.

The area

The counties it named.

The facts

Issued
Aug 29, 2012, 3:52 PM EDT (19:52 UTC)
Expired
Aug 29, 2012, 4:45 PM EDT
In force
53 min
Issued by
NWS Columbia, SC
Area
Storm-based polygon

Counties Clarendon County, SC, Lee County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 77 km from the middle of the area, began a volume at 19:53 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 12:00Z, 7.9 hours before the alert went out and 116 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 2012-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1031 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 2012-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.1939Sfc1 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
1031 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
627 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The office that day

Everything else NWS Columbia, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 29, 1:44 PM EDTAreal Flood AdvisoryCAEFairfield, Newberry2 hr
Aug 29, 2:47 PM EDTAreal Flood AdvisoryCAEKershaw, Lee58 min
Aug 29, 7:12 PM EDTAreal Flood AdvisoryCAERichmond108 min
Aug 29, 7:54 PM EDTSpecial Weather StatementCAERichmond66 min

Nearby

Areal Flood Advisories in South Carolina, 2012Every areal flood advisory 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; radar from the NEXRAD Level II archive.