Alert archive / Georgia / Frost Advisories in 2022

Frost Advisory 4, NWS Charleston, SC

October 18, 2022Allendale County, South Carolina; 4 counties in Georgia

NWS Charleston, SC issued this frost advisory at Oct 18, 2022, 3:21 AM EDT for Allendale County, South Carolina; 4 counties in Georgia. It took effect at Oct 19, 2022, 5:00 AM EDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Oct 18, 2022, 3:21 AM EDT (07:21 UTC)
In effect from
Oct 19, 2022, 5:00 AM EDT
Expired
Oct 19, 2022, 9:00 AM EDT
In force
4 hr
Issued by
NWS Charleston, SC

Counties Bulloch County, GA, Candler County, GA, Jenkins County, GA, Screven County, GA, Allendale County, SC

The radar

The Charleston,SC radar (KCLX), 66 km from the middle of the area, began a volume at 07:24 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

Charleston AFB, SC (KCHS), launched 00:00Z, 7.4 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, Charleston AFB, SC at 00:00Z on 2022-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1127 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, Charleston AFB, SC at 00:00Z on 2022-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 195 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
1127 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
1009 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
195 m²/s²
0-3 km storm-relative helicity
176 m²/s²
Significant tornado parameter
1.3
Supercell composite
7.4

Open this sounding in Storm Lab

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 18, 3:46 PM EDTSmall Craft AdvisoryCHS19 hr

Nearby

Frost Advisories in Georgia, 2022Frost Advisories in South Carolina, 2022Every frost advisory in 2022

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.