Alert archive / Georgia / Freeze Warnings in 2018

Freeze Warning 1, NWS Greenville-Spartanburg, SC

April 4, 2018Habersham County, Rabun County, Georgia

NWS Greenville-Spartanburg, SC issued this freeze warning at Apr 4, 2018, 3:40 AM EDT for Habersham County, Rabun County, Georgia. It took effect at Apr 5, 2018, 4:00 AM EDT. It was in force for 5 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
Apr 4, 2018, 3:40 AM EDT (07:40 UTC)
In effect from
Apr 5, 2018, 4:00 AM EDT
Expired
Apr 5, 2018, 9:00 AM EDT
In force
5 hr
Issued by
NWS Greenville-Spartanburg, SC

Counties Habersham County, GA, Rabun County, GA

The radar

The Greer radar (KGSP), 115 km from the middle of the area, began a volume at 07:43 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 7.7 hours before the alert went out and 181 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, Peachtre/Fal Fld, GA at 00:00Z on 2018-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 66 joules per kilogram.LCLLFCEL10008507005003002001001 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, Peachtre/Fal Fld, GA at 00:00Z on 2018-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 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
66 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1853 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 4, 2:19 AM EDTSpecial Weather StatementGSPGraham, Swain41 min
Apr 4, 2:37 AM EDTSpecial Weather StatementGSPAvery, Buncombe, Madison, Mitchell, Yancey38 min
Apr 4, 2:41 AM EDTWind AdvisoryGSPAvery, Burke, Caldwell, McDowell, Mitchell, Yancey23 hr
Apr 4, 2:55 AM EDTSpecial Weather StatementGSPGraham, Haywood, Jackson, Macon, Swain50 min
Apr 4, 3:09 AM EDTSpecial Weather StatementGSPAvery, Buncombe, Madison, Mitchell, Yancey51 min
Apr 4, 3:40 AM EDTSpecial Weather StatementGSPHaywood, Jackson, Macon, Transylvania50 min
Apr 4, 3:52 AM EDTSpecial Weather StatementGSPAvery, Buncombe, Burke, Caldwell, McDowell, Mitchell and 1 more38 min
Apr 4, 4:15 AM EDTSpecial Weather StatementGSPBuncombe, Henderson, Jackson, Transylvania45 min
Apr 4, 4:50 AM EDTSpecial Weather StatementGSPBurke, Henderson, McDowell, Polk, Rutherford40 min
Apr 4, 5:30 AM EDTSpecial Weather StatementGSPCatawba, Cleveland, Lincoln45 min
Apr 4, 3:43 AM EDTSpecial Weather StatementGSPOconee47 min
Apr 4, 3:06 AM EDTSpecial Weather StatementGSPHabersham, Rabun, Stephens39 min

Nearby

Freeze Warnings in Georgia, 2018Every freeze warning in 2018

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.