Alert archive / South Carolina / Heat Advisories in 2011

Heat Advisory 7, NWS Wilmington, NC

July 20, 20118 counties in South Carolina; 6 counties in North Carolina

NWS Wilmington, NC issued this heat advisory at Jul 20, 2011, 3:00 PM EDT for 8 counties in South Carolina; 6 counties in North Carolina. It took effect at Jul 21, 2011, 11:00 AM EDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Jul 20, 2011, 3:00 PM EDT (19:00 UTC)
In effect from: Jul 21, 2011, 11:00 AM EDT
Expired: Jul 21, 2011, 8:00 PM EDT
In force: 9 hr
Issued by: NWS Wilmington, NC

Counties Bladen County, NC, Brunswick County, NC, Columbus County, NC, New Hanover County, NC, Pender County, NC, Robeson County, NC, Darlington County, SC, Dillon County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Marlboro County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 59 km from the middle of the area, began a volume at 19:04 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, 7.0 hours before the alert went out and 169 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: 834 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1184 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Wilmington, NC wrote its last area forecast discussion before this heat advisory went out at Jul 20, 1:02 PM EDT, 1 hour 58 minutes earlier.

Area forecast discussion, Jul 20, 1:02 PM EDT, 1 hour 58 minutes before

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Hazardous weather outlook, Jul 20, 9:55 AM EDT, 5 hours 5 minutes before

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The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 3:28 AM EDT	Heat Advisory	ILM	Darlington, Dillon, Florence, Georgetown, Marion, Marlboro and 1 more	17 hr
Jul 20, 5:57 PM EDT	Special Weather Statement	ILM	Bladen	63 min
Jul 20, 6:52 PM EDT	Special Weather Statement	ILM	Columbus	53 min

Nearby

Heat Advisories in South Carolina, 2011 Heat Advisories in North Carolina, 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.