Alert archive / North Carolina / Ice Storm Warnings in 2009

Ice Storm Warning 1, NWS Greenville-Spartanburg, SC

December 24, 200916 counties in North Carolina

NWS Greenville-Spartanburg, SC issued this ice storm warning at Dec 24, 2009, 4:05 AM EST for 16 counties in North Carolina. It took effect at Dec 24, 2009, 6:00 PM EST. It was in force for 18 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 24, 2009, 4:05 AM EST (09:05 UTC)
In effect from: Dec 24, 2009, 6:00 PM EST
Expired: Dec 25, 2009, 12:00 PM EST
In force: 18 hr
Issued by: NWS Greenville-Spartanburg, SC

Counties Alexander County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Catawba County, NC, Cleveland County, NC, Henderson County, NC, Iredell County, NC, Lincoln 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), 92 km from the middle of the area, began a volume at 09:07 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

Roanoke, VA (KRNK), launched 00:00Z, 9.1 hours before the alert went out and 272 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: 1365 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 22 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 ice 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 ice storm warning went out at Dec 24, 3:39 AM EST, 26 minutes earlier.

Area forecast discussion, Dec 24, 3:39 AM EST, 26 minutes before

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Hazardous weather outlook, Dec 23, 3:47 PM EST, 12 hours 18 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
Dec 24, 4:05 AM EST	Freezing Rain Advisory	GSP	Buncombe, Catawba, Cleveland, Henderson, Iredell, Polk and 2 more	23 hr
Dec 24, 2:44 PM EST	Lake Wind Advisory	GSP	Cabarrus, Gaston, Mecklenburg, Rowan, Union	21 hr

Nearby

Ice Storm Warnings in North Carolina, 2009 Every ice 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.