Alert archive / North Carolina / Frost Advisories in 2020

Frost Advisory 1, NWS Greenville-Spartanburg, SC

April 10, 202016 counties in North Carolina; 7 counties in South Carolina

NWS Greenville-Spartanburg, SC issued this frost advisory at Apr 10, 2020, 2:58 PM EDT for 16 counties in North Carolina; 7 counties in South Carolina. It took effect at Apr 11, 2020, 3:00 AM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Apr 10, 2020, 2:58 PM EDT (18:58 UTC)
In effect from: Apr 11, 2020, 3:00 AM EDT
Expired: Apr 11, 2020, 9:00 AM EDT
In force: 6 hr
Issued by: NWS Greenville-Spartanburg, SC

All 23 counties

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, Cherokee County, SC, Chester County, SC, Greenwood County, SC, Laurens County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 87 km from the middle of the area, began a volume at 18:56 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, 7.0 hours before the alert went out and 162 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: 1628 m above ground
0-6 km bulk shear: 121 kt
0-1 km storm-relative helicity: -158 m²/s²
0-3 km storm-relative helicity: -68 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 Apr 10, 1:56 PM EDT, 1 hour 2 minutes earlier.

Area forecast discussion, Apr 10, 1:56 PM EDT, 1 hour 2 minutes before

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Hazardous weather outlook, Apr 10, 11:01 AM EDT, 3 hours 57 minutes before

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In the hours before

Special weather statement, Apr 10, 10:58 AM EDT, 4 hours before

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Local storm report, Apr 10, 11:08 AM EDT, 3 hours 50 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
Apr 9, 8:28 PM EDT	Red Flag Warning	GSP	Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 18 more	24 hr
Apr 9, 9:35 PM EDT	Wind Advisory	GSP	Avery, Buncombe, Burke, Caldwell, Graham, Haywood and 11 more	20 hr

Nearby

Frost Advisories in North Carolina, 2020 Frost Advisories in South Carolina, 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.