Alert archive / North Carolina / Frost Advisories in 2015

Frost Advisory 6, NWS Greenville-Spartanburg, SC

October 17, 201513 counties in North Carolina; Habersham County, Rabun County, Georgia

NWS Greenville-Spartanburg, SC issued this frost advisory at Oct 17, 2015, 2:22 PM EDT for 13 counties in North Carolina; Habersham County, Rabun County, Georgia. It took effect at Oct 18, 2015, 12:00 AM EDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Oct 17, 2015, 2:22 PM EDT (18:22 UTC)
In effect from
Oct 18, 2015, 12:00 AM EDT
Expired
Oct 18, 2015, 9:00 AM EDT
In force
9 hr
Issued by
NWS Greenville-Spartanburg, SC

Counties Habersham County, GA, Rabun County, GA, Alexander County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie County, NC, Iredell County, NC, Lincoln County, NC, McDowell County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC

The radar

The Greer radar (KGSP), 90 km from the middle of the area, began a volume at 18:20 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, 6.4 hours before the alert went out and 166 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, Greensboro/Hi Pt, NC at 12:00Z on 2015-10-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Greensboro/Hi Pt, NC at 12:00Z on 2015-10-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -141 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2001 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
-141 m²/s²
0-3 km storm-relative helicity
83 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
Oct 17, 3:33 AM EDTFreeze WarningGSPAvery, Buncombe, Burke, Caldwell, Graham, Haywood and 9 more29 hr
Oct 17, 2:22 PM EDTFreeze WatchGSPAlexander, Burke, Cabarrus, Caldwell, Catawba, Cleveland and 7 more24 hr

Nearby

Frost Advisories in North Carolina, 2015Frost Advisories in Georgia, 2015Every frost advisory in 2015

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.