Alert archive / North Carolina / Flood Watches in 2017

Flood Watch 1, NWS Greenville-Spartanburg, SC

April 22, 201728 counties in North Carolina; 8 counties in South Carolina

NWS Greenville-Spartanburg, SC issued this flood watch at Apr 22, 2017, 2:57 PM EDT for 28 counties in North Carolina; 8 counties in South Carolina. It took effect at Apr 23, 2017, 12:00 AM EDT. It was in force for 52 hr.

The area

The counties it named.

The facts

Issued: Apr 22, 2017, 2:57 PM EDT (18:57 UTC)
In effect from: Apr 23, 2017, 12:00 AM EDT
Expired: Apr 25, 2017, 4:00 AM EDT
In force: 52 hr
Issued by: NWS Greenville-Spartanburg, SC
Flood severity: None

All 36 counties

Alexander County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Cabarrus County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie County, NC, Gaston County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Iredell County, NC, Jackson County, NC, Lincoln County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mecklenburg County, NC, Mitchell County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Union County, NC, Yancey County, NC, Abbeville County, SC, Anderson County, SC, Cherokee County, SC, Chester County, SC, Greenwood County, SC, Laurens County, SC, Union County, SC, York County, SC

The radar

The Greer radar (KGSP), 59 km from the middle of the area, began a volume at 18:56 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, 7.0 hours before the alert went out and 198 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: 141 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 1050 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this 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 flood watch went out at Apr 22, 2:55 PM EDT, 2 minutes earlier.

Area forecast discussion, Apr 22, 2:55 PM EDT, 2 minutes before

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Hazardous weather outlook, Apr 22, 9:08 AM EDT, 5 hours 49 minutes before

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In the hours before

Special weather statement, Apr 22, 9:06 AM EDT, 5 hours 51 minutes before

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Special weather statement, Apr 22, 12:25 PM EDT, 2 hours 32 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 22, 5:55 AM EDT	Dense Fog Advisory	GSP	Alexander, Burke, Caldwell, Catawba, Cleveland, Lincoln and 3 more	3 hr
Apr 22, 12:25 PM EDT	Special Weather Statement	GSP	Watauga	20 min
Apr 22, 7:14 PM EDT	Special Weather Statement	GSP	Madison, Yancey	46 min

Nearby

Flood Watches in North Carolina, 2017 Flood Watches in South Carolina, 2017 Every flood watch in 2017

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.