Alert archive / South Carolina / Heat Advisories in 2011

Heat Advisory 1, NWS Columbia, SC

June 20, 201111 counties in South Carolina; Burke County, Richmond County, Georgia

NWS Columbia, SC issued this heat advisory at Jun 20, 2011, 3:24 AM EDT for 11 counties in South Carolina; Burke County, Richmond County, Georgia. It took effect at Jun 20, 2011, 12:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jun 20, 2011, 3:24 AM EDT (07:24 UTC)
In effect from: Jun 20, 2011, 12:00 PM EDT
Expired: Jun 20, 2011, 8:00 PM EDT
In force: 8 hr
Issued by: NWS Columbia, SC

Counties Burke County, GA, Richmond County, GA, Aiken County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chesterfield County, SC, Clarendon County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, Richland County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 25 km from the middle of the area, began a volume at 07:26 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, 7.4 hours before the alert went out and 131 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3205 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1266 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Columbia, SC wrote its last area forecast discussion before this heat advisory went out at Jun 20, 3:04 AM EDT, 20 minutes earlier.

Area forecast discussion, Jun 20, 3:04 AM EDT, 20 minutes before

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Hazardous weather outlook, Jun 19, 7:16 PM EDT, 8 hours 8 minutes before

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In the hours before

Local storm report, Jun 20, 3:04 AM EDT, 20 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 1:23 AM EDT	Severe Thunderstorm Warning	CAE	Newberry, Saluda	52 min
Jun 20, 2:16 AM EDT	Severe Thunderstorm Warning	CAE	Aiken, Edgefield, Lexington, Saluda	59 min

Nearby

Heat Advisories in South Carolina, 2011 Heat Advisories in Georgia, 2011 Every heat advisory in 2011

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.