Alert archive / South Carolina / Flash Flood Watches in 2013

Flash Flood Watch 1, NWS Columbia, SC

July 11, 201316 counties in South Carolina; 5 counties in Georgia

NWS Columbia, SC issued this flash flood watch at Jul 11, 2013, 3:40 AM EDT for 16 counties in South Carolina; 5 counties in Georgia. It took effect at Jul 11, 2013, 2:00 PM EDT. It was in force for 22 hr.

The area

The counties it named.

The facts

Issued: Jul 11, 2013, 3:40 AM EDT (07:40 UTC)
In effect from: Jul 11, 2013, 2:00 PM EDT
Expired: Jul 12, 2013, 12:00 PM EDT
In force: 22 hr
Issued by: NWS Columbia, SC
Flood severity: None

All 21 counties

Burke County, GA, Columbia County, GA, Lincoln County, GA, McDuffie County, GA, Richmond County, GA, Aiken County, SC, Bamberg County, SC, Barnwell County, SC, Calhoun County, SC, Chesterfield County, SC, Clarendon County, SC, Edgefield County, SC, Fairfield County, SC, Kershaw County, SC, Lee County, SC, Lexington County, SC, McCormick County, SC, Newberry County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 28 km from the middle of the area, began a volume at 07:42 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 00:00Z, 7.7 hours before the alert went out and 286 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: 1181 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1044 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Columbia, SC wrote its last area forecast discussion before this flash flood watch went out at Jul 11, 3:26 AM EDT, 14 minutes earlier.

Area forecast discussion, Jul 11, 3:26 AM EDT, 14 minutes before

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Hazardous weather outlook, Jul 11, 12:12 AM EDT, 3 hours 28 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 6:24 AM EDT	Areal Flood Advisory	CAE	McCormick	12 hr
Jul 11, 9:30 AM EDT	River Flood Warning	CAE	Aiken	3 days
Jul 11, 1:52 PM EDT	Areal Flood Advisory	CAE	Lancaster	53 min
Jul 11, 3:25 PM EDT	Areal Flood Advisory	CAE	Lexington, Richland	65 min
Jul 11, 3:31 PM EDT	Areal Flood Advisory	CAE	Chesterfield, Kershaw	59 min
Jul 11, 3:49 PM EDT	Areal Flood Advisory	CAE	Saluda	56 min
Jul 11, 4:16 PM EDT	Areal Flood Advisory	CAE	Richland	59 min
Jul 11, 4:44 PM EDT	Flash Flood Warning	CAE	Richland	61 min
Jul 11, 5:06 PM EDT	Areal Flood Advisory	CAE	Calhoun, Lexington, Richland	54 min
Jul 11, 5:17 PM EDT	Areal Flood Advisory	CAE	Lancaster	58 min
Jul 11, 5:32 PM EDT	Areal Flood Advisory	CAE	Aiken, Edgefield, McCormick	118 min
Jul 11, 5:53 PM EDT	Flash Flood Warning	CAE	Lancaster	112 min
Jul 11, 6:55 PM EDT	Areal Flood Advisory	CAE	Fairfield, Kershaw, Lancaster	110 min
Jul 11, 7:00 PM EDT	Areal Flood Advisory	CAE	Fairfield, Kershaw, Lancaster	105 min
Jul 11, 7:06 PM EDT	Special Weather Statement	CAE	Sumter	24 min
Jul 11, 7:32 PM EDT	Areal Flood Advisory	CAE	Clarendon, Lee, Sumter	118 min
Jul 11, 7:59 PM EDT	Areal Flood Advisory	CAE	Calhoun, Orangeburg	2 hr
Jul 11, 5:53 PM EDT	Flash Flood Warning	CAE	Richmond	82 min
Jul 11, 6:21 PM EDT	Flash Flood Warning	CAE	Columbia	84 min

Nearby

Flash Flood Watches in South Carolina, 2013 Flash Flood Watches in Georgia, 2013 Every flash flood watch in 2013

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.