Alert archive / North Carolina / Flash Flood Watches in 2011

Flash Flood Watch 1, NWS Greenville-Spartanburg, SC

April 26, 201113 counties in North Carolina; Rabun County, Georgia

NWS Greenville-Spartanburg, SC issued this flash flood watch at Apr 26, 2011, 11:31 AM EDT for 13 counties in North Carolina; Rabun County, Georgia. It took effect at Apr 26, 2011, 6:00 PM EDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Apr 26, 2011, 11:31 AM EDT (15:31 UTC)
In effect from: Apr 26, 2011, 6:00 PM EDT
Expired: Apr 26, 2011, 10:06 PM EDT
In force: 4 hr
Issued by: NWS Greenville-Spartanburg, SC
Flood severity: None

Counties Rabun County, GA, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Transylvania County, NC, Yancey County, NC

The radar

The Greer radar (KGSP), 74 km from the middle of the area, began a volume at 15:34 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, 3.5 hours before the alert went out and 233 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: 376 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 85 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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this flash flood watch went out at Apr 26, 6:27 AM EDT, 5 hours 4 minutes earlier.

Area forecast discussion, Apr 26, 6:27 AM EDT, 5 hours 4 minutes before

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Hazardous weather outlook, Apr 26, 4:25 AM EDT, 7 hours 6 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 5:39 PM EDT	Special Weather Statement	GSP	Union	51 min
Apr 26, 5:43 PM EDT	Severe Thunderstorm Warning	GSP	Cabarrus, Mecklenburg, Union	30 min
Apr 26, 5:23 PM EDT	Severe Thunderstorm Warning	GSP	Chester, Laurens, Union	45 min

Nearby

Flash Flood Watches in North Carolina, 2011 Flash Flood Watches in Georgia, 2011 Flash Flood Watches in South Carolina, 2011 Every flash flood watch in 2011

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.