Alert archive / South Carolina / Flash Flood Warnings in 2014

Flash Flood Warning 8, NWS Columbia, SC

July 21, 2014Orangeburg County, South Carolina

NWS Columbia, SC issued this flash flood warning at Jul 21, 2014, 6:37 PM EDT for Orangeburg County, South Carolina. It was in force for 83 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 21, 2014, 6:37 PM EDT (22:37 UTC)
Expired: Jul 21, 2014, 8:00 PM EDT
In force: 83 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Flood severity: None

County Orangeburg County, SC

The radar

The Columbia radar (KCAE), 64 km from the middle of the area, began a volume at 22:37 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.6 hours before the alert went out and 305 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: 1351 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 511 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 8:38 PM EDT	Areal Flood Advisory	CAE	Richland	52 min
Jul 20, 9:12 PM EDT	Flash Flood Warning	CAE	Richland	63 min
Jul 21, 8:48 AM EDT	Areal Flood Advisory	CAE	Lexington, Richland	117 min
Jul 21, 2:54 PM EDT	Areal Flood Advisory	CAE	Clarendon	81 min
Jul 21, 3:46 PM EDT	Areal Flood Advisory	CAE	Fairfield, Kershaw, Lancaster	59 min
Jul 21, 3:47 PM EDT	Areal Flood Advisory	CAE	Chesterfield	58 min
Jul 21, 3:57 PM EDT	Areal Flood Advisory	CAE	Lexington, Richland	63 min
Jul 21, 5:20 PM EDT	Areal Flood Advisory	CAE	Aiken, Bamberg, Barnwell, Orangeburg	55 min
Jul 21, 5:31 PM EDT	Areal Flood Advisory	CAE	Sumter	59 min
Jul 21, 6:26 PM EDT	Areal Flood Advisory	CAE	Bamberg, Calhoun, Orangeburg	49 min
Jul 21, 7:59 PM EDT	Areal Flood Advisory	CAE	Burke	61 min

Nearby

Flash Flood Warnings in South Carolina, 2014 Every flash flood warning in 2014

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.