Alert archive / North Carolina / Winter Storm Warnings in 2009

Winter Storm Warning 8, NWS Greenville-Spartanburg, SC

December 17, 200924 counties in North Carolina

NWS Greenville-Spartanburg, SC issued this winter storm warning at Dec 17, 2009, 3:53 PM EST for 24 counties in North Carolina. It took effect at Dec 18, 2009, 6:00 AM EST. It was in force for 58 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 17, 2009, 3:53 PM EST (20:53 UTC)
In effect from: Dec 18, 2009, 6:00 AM EST
Expired: Dec 20, 2009, 4:00 PM EST
In force: 58 hr
Issued by: NWS Greenville-Spartanburg, SC

All 24 counties

Alexander County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Davie 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, Mitchell County, NC, Polk County, NC, Rowan County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Yancey County, NC

The radar

The Greer radar (KGSP), 82 km from the middle of the area, began a volume at 20:58 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, 8.9 hours before the alert went out and 205 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2008 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 6 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 winter storm warning 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 winter storm warning went out at Dec 17, 3:27 PM EST, 26 minutes earlier.

Area forecast discussion, Dec 17, 3:27 PM EST, 26 minutes before

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Hazardous weather outlook, Dec 17, 4:32 AM EST, 11 hours 21 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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
Dec 17, 3:53 PM EST	Winter Weather Advisory	GSP	Cabarrus, Cleveland, Gaston, Lincoln, Mecklenburg	38 hr

Nearby

Winter Storm Warnings in North Carolina, 2009 Winter Storm Warnings in South Carolina, 2009 Every winter storm warning in 2009

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.