Alert archive / North Carolina / Freeze Warnings in 2015

Freeze Warning 5, NWS Greenville-Spartanburg, SC

October 17, 201515 counties in North Carolina

NWS Greenville-Spartanburg, SC issued this freeze warning at Oct 17, 2015, 3:33 AM EDT for 15 counties in North Carolina. It took effect at Oct 18, 2015, 12:00 AM EDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Oct 17, 2015, 3:33 AM EDT (07:33 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 Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Swain County, NC, Transylvania County, NC, Yancey County, NC

The radar

The Greer radar (KGSP), 88 km from the middle of the area, began a volume at 07:37 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

Roanoke, VA (KRNK), launched 00:00Z, 7.6 hours before the alert went out and 329 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, Roanoke, VA at 00:00Z 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, Roanoke, VA at 00:00Z on 2015-10-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 square meters per square second.1939587897117Sfc1 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
2176 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
27 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, 2:22 PM EDTFrost AdvisoryGSPAlexander, Burke, Cabarrus, Caldwell, Catawba, Cleveland and 7 more19 hr
Oct 17, 2:22 PM EDTFreeze WatchGSPAlexander, Burke, Cabarrus, Caldwell, Catawba, Cleveland and 7 more24 hr

Nearby

Freeze Warnings in North Carolina, 2015Every freeze warning 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.