Alert archive / Georgia / Areal Flood Advisories in 2021

Areal Flood Advisory 2, NWS Charleston, SC

February 18, 2021Bulloch County, Screven County, Georgia

NWS Charleston, SC issued this areal flood advisory at Feb 18, 2021, 3:29 PM EST for Bulloch County, Screven County, Georgia. It was in force for 114 min.

The area

The counties it named.

The facts

Issued
Feb 18, 2021, 3:29 PM EST (20:29 UTC)
Expired
Feb 18, 2021, 5:23 PM EST
In force
114 min
Issued by
NWS Charleston, SC
Area
Storm-based polygon

Counties Bulloch County, GA, Screven County, GA

The radar

The Charleston,SC radar (KCLX), 60 km from the middle of the area, began a volume at 20:28 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

Jacksonville, FL (KJAX), launched 12:00Z, 8.5 hours before the alert went out and 231 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, Jacksonville, FL at 12:00Z on 2021-02-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 286 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, Jacksonville, FL at 12:00Z on 2021-02-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 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
286 J/kg
Mixed-layer CIN
-93 J/kg
Mixed-layer LCL
663 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
151 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.7

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 18, 1:25 AM ESTMarine Dense Fog AdvisoryCHS26 hr
Feb 18, 3:37 AM ESTSmall Craft AdvisoryCHS41 hr
Feb 18, 3:38 AM ESTDense Fog AdvisoryCHS4 hr
Feb 18, 7:15 AM ESTFlash Flood WatchCHSAllendale, Berkeley, Colleton, Dorchester, Hampton20 hr
Feb 18, 10:40 AM ESTRiver Flood WarningCHSAllendale21 days
Feb 18, 4:40 PM ESTAreal Flood AdvisoryCHSAllendale, Colleton, Hampton110 min
Feb 18, 5:17 PM ESTAreal Flood AdvisoryCHSDorchester118 min
Feb 18, 5:44 PM ESTAreal Flood AdvisoryCHSBerkeley2 hr
Feb 17, 9:23 PM ESTRiver Flood WarningCHSBryan, Bulloch, Chatham, Effingham25 days

Nearby

Areal Flood Advisories in Georgia, 2021Every areal flood advisory in 2021

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.