Alert archive / North Carolina / Winter Storm Watches in 2011

Winter Storm Watch 2, NWS Greenville-Spartanburg, SC

January 11, 20117 counties in North Carolina

NWS Greenville-Spartanburg, SC issued this winter storm watch at Jan 11, 2011, 3:47 AM EST for 7 counties in North Carolina. It took effect at Jan 11, 2011, 6:00 PM EST. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Jan 11, 2011, 3:47 AM EST (08:47 UTC)
In effect from: Jan 11, 2011, 6:00 PM EST
Expired: Jan 11, 2011, 10:09 PM EST
In force: 4 hr
Issued by: NWS Greenville-Spartanburg, SC

Counties Avery County, NC, Graham County, NC, Haywood County, NC, Madison County, NC, Mitchell County, NC, Swain County, NC, Yancey County, NC

The radar

The Knoxville radar (KMRX), 73 km from the middle of the area, began a volume at 08:51 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 00:00Z, 8.8 hours before the alert went out and 261 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: 594 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 526 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 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 winter storm watch went out at Jan 11, 2:52 AM EST, 55 minutes earlier.

Area forecast discussion, Jan 11, 2:52 AM EST, 55 minutes before

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Hazardous weather outlook, Jan 10, 3:43 PM EST, 12 hours 4 minutes before

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In the hours before

Local storm report, Jan 10, 10:42 PM EST, 5 hours 5 minutes before

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Local storm report, Jan 10, 11:25 PM EST, 4 hours 22 minutes before

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Local storm report, Jan 11, 12:35 AM EST, 3 hours 12 minutes before

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Local storm report, Jan 11, 1:54 AM EST, 1 hour 53 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
Jan 11, 3:47 AM EST	Winter Weather Advisory	GSP	Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 22 more	56 hr
Jan 11, 2:13 PM EST	Winter Weather Advisory	GSP	Avery, Graham, Haywood, Madison, Mitchell, Swain and 1 more	46 hr

Nearby

Winter Storm Watches in North Carolina, 2011 Every winter storm 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.