Alert archive / North Carolina / Heat Advisories in 2011

Heat Advisory 4, NWS Greenville-Spartanburg, SC

July 20, 201110 counties in North Carolina; 8 counties in South Carolina; Elbert County, Franklin County, Hart County, Georgia

NWS Greenville-Spartanburg, SC issued this heat advisory at Jul 20, 2011, 2:37 PM EDT for 10 counties in North Carolina; 8 counties in South Carolina; Elbert County, Franklin County, Hart County, Georgia. It took effect at Jul 21, 2011, 12:00 PM EDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Jul 20, 2011, 2:37 PM EDT (18:37 UTC)
In effect from
Jul 21, 2011, 12:00 PM EDT
Expired
Jul 21, 2011, 9:00 PM EDT
In force
9 hr
Issued by
NWS Greenville-Spartanburg, SC
All 21 counties

Elbert County, GA, Franklin County, GA, Hart County, GA, Alexander County, NC, Cabarrus County, NC, Catawba County, NC, Davie County, NC, Gaston County, NC, Iredell County, NC, Lincoln County, NC, Mecklenburg County, NC, Rowan County, NC, Union County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Greenwood County, SC, Laurens County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 63 km from the middle of the area, began a volume at 18:38 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, 6.6 hours before the alert went out and 274 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 2011-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 834 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 2011-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
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

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 20, 10:23 AM EDTHeat AdvisoryGSPCabarrus, Mecklenburg, Union11 hr
Jul 20, 2:30 PM EDTSpecial Weather StatementGSPPolk30 min
Jul 20, 2:59 PM EDTSpecial Weather StatementGSPUnion31 min
Jul 20, 3:10 PM EDTSpecial Weather StatementGSPPolk65 min
Jul 20, 4:16 PM EDTSpecial Weather StatementGSPGreenville44 min
Jul 20, 5:14 PM EDTSpecial Weather StatementGSPSpartanburg46 min
Jul 20, 5:51 PM EDTSpecial Weather StatementGSPCherokee39 min
Jul 20, 6:31 PM EDTSpecial Weather StatementGSPLaurens44 min
Jul 20, 6:49 PM EDTSevere Thunderstorm WarningGSPGreenville, Laurens56 min

Nearby

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