Alert archive / North Carolina / Frost Advisories in 2020

Frost Advisory 14, NWS Greenville-Spartanburg, SC

October 30, 202020 counties in North Carolina; Rabun County, Georgia

NWS Greenville-Spartanburg, SC issued this frost advisory at Oct 30, 2020, 2:46 PM EDT for 20 counties in North Carolina; Rabun County, Georgia. It took effect at Oct 31, 2020, 12:00 AM EDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Oct 30, 2020, 2:46 PM EDT (18:46 UTC)
In effect from: Oct 31, 2020, 12:00 AM EDT
Expired: Oct 31, 2020, 10:00 AM EDT
In force: 10 hr
Issued by: NWS Greenville-Spartanburg, SC

All 21 counties

Rabun County, GA, Alexander County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie County, NC, Gaston County, NC, Graham County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, McDowell County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC

The radar

The Greer radar (KGSP), 70 km from the middle of the area, began a volume at 18:45 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, 6.8 hours before the alert went out and 203 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: 1211 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: -111 m²/s²
0-3 km storm-relative helicity: 102 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 30, 1:51 PM EDT, 55 minutes earlier.

Area forecast discussion, Oct 30, 1:51 PM EDT, 55 minutes before

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Hazardous weather outlook, Oct 30, 12:11 PM EDT, 2 hours 35 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 29, 8:04 PM EDT	Wind Advisory	GSP	Avery, Buncombe, Graham, Haywood, Jackson, Macon and 4 more	16 hr
Oct 29, 8:26 PM EDT	Special Weather Statement	GSP	Lincoln	34 min
Oct 29, 8:28 PM EDT	Special Weather Statement	GSP	Gaston	32 min
Oct 29, 8:57 PM EDT	Special Weather Statement	GSP	Rowan	48 min
Oct 29, 9:04 PM EDT	Special Weather Statement	GSP	Cabarrus, Mecklenburg	41 min
Oct 29, 9:44 PM EDT	Special Weather Statement	GSP	Cabarrus, Mecklenburg, Rowan	46 min
Oct 29, 10:18 PM EDT	Special Weather Statement	GSP	Union	42 min
Oct 29, 10:52 PM EDT	Special Weather Statement	GSP	Union	53 min
Oct 30, 2:07 AM EDT	Areal Flood Advisory	GSP	Burke	3 hr
Oct 30, 5:51 AM EDT	Areal Flood Advisory	GSP	Alexander, Catawba, Iredell	12 hr
Oct 30, 10:12 AM EDT	Freeze Watch	GSP	Haywood, Madison, Mitchell, Yancey	5 hr
Oct 30, 2:46 PM EDT	Freeze Warning	GSP	Haywood, Madison, Mitchell, Yancey	19 hr
Oct 29, 8:00 PM EDT	Special Weather Statement	GSP	Cherokee	30 min
Oct 29, 8:35 PM EDT	Special Weather Statement	GSP	Laurens, Union	40 min
Oct 29, 9:06 PM EDT	Special Weather Statement	GSP	Greenwood	39 min
Oct 29, 9:46 PM EDT	Special Weather Statement	GSP	Chester, York	44 min

Nearby

Frost Advisories in North Carolina, 2020 Frost Advisories in Georgia, 2020 Every frost advisory in 2020

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.