Alert archive / North Carolina / Wind Chill Advisories in 2009

Wind Chill Advisory 2, NWS Greenville-Spartanburg, SC

January 20, 2009Avery County, Mitchell County, Yancey County, North Carolina

NWS Greenville-Spartanburg, SC issued this wind chill advisory at Jan 20, 2009, 2:16 PM EST for Avery County, Mitchell County, Yancey County, North Carolina. It took effect at Jan 20, 2009, 6:00 PM EST. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued
Jan 20, 2009, 2:16 PM EST (19:16 UTC)
In effect from
Jan 20, 2009, 6:00 PM EST
Expired
Jan 21, 2009, 9:00 AM EST
In force
15 hr
Issued by
NWS Greenville-Spartanburg, SC

Counties Avery County, NC, Mitchell County, NC, Yancey County, NC

The radar

The Knoxville radar (KMRX), 116 km from the middle of the area, began a volume at 19:21 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 12:00Z, 7.3 hours before the alert went out and 270 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-pSkew-T log-p diagram, Roanoke, VA at 12:00Z on 2009-01-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Roanoke, VA at 12:00Z on 2009-01-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -19 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
980 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
-19 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 20, 2:16 PM ESTWinter Weather AdvisoryGSPAvery, Buncombe, Cabarrus, Graham, Haywood, Henderson and 9 more19 hr

Nearby

Wind Chill Advisories in North Carolina, 2009Every wind chill advisory 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.