Alert archive / North Carolina / Frost Advisories in 2011

Frost Advisory 11, NWS Greenville-Spartanburg, SC

October 21, 201116 counties in North Carolina; 8 counties in South Carolina; 6 counties in Georgia

NWS Greenville-Spartanburg, SC issued this frost advisory at Oct 21, 2011, 2:30 PM EDT for 16 counties in North Carolina; 8 counties in South Carolina; 6 counties in Georgia. It took effect at Oct 22, 2011, 2:00 AM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Oct 21, 2011, 2:30 PM EDT (18:30 UTC)
In effect from: Oct 22, 2011, 2:00 AM EDT
Expired: Oct 22, 2011, 10:00 AM EDT
In force: 8 hr
Issued by: NWS Greenville-Spartanburg, SC

All 30 counties

Elbert County, GA, Franklin County, GA, Habersham County, GA, Hart County, GA, Rabun County, GA, Stephens County, GA, Alexander County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie County, NC, Gaston County, NC, Iredell County, NC, Lincoln County, NC, McDowell County, NC, Mecklenburg County, NC, Polk County, NC, Rowan County, NC, Rutherford 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), 45 km from the middle of the area, began a volume at 18:29 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.5 hours before the alert went out and 204 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1248 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: -10 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 frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Greenville-Spartanburg, SC wrote its last area forecast discussion before this frost advisory went out at Oct 20, 7:58 PM EDT, 18 hours 32 minutes earlier.

Area forecast discussion, Oct 20, 7:58 PM EDT, 18 hours 32 minutes before

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Hazardous weather outlook, Oct 20, 7:01 PM EDT, 19 hours 29 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 21, 2:30 PM EDT	Freeze Warning	GSP	Avery, Buncombe, Graham, Haywood, Henderson, Jackson and 6 more	20 hr

Nearby

Frost Advisories in North Carolina, 2011 Frost Advisories in South Carolina, 2011 Frost Advisories in Georgia, 2011 Every frost 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.