Alert archive / North Carolina / Winter Storm Watches in 2017

Winter Storm Watch 3, NWS Greenville-Spartanburg, SC

March 10, 20174 counties in North Carolina

NWS Greenville-Spartanburg, SC issued this winter storm watch at Mar 10, 2017, 3:33 PM EST for 4 counties in North Carolina. It took effect at Mar 11, 2017, 7:00 PM EST. It was in force for .

The area

The counties it named.

The facts

Issued: Mar 10, 2017, 3:33 PM EST (20:33 UTC)
In effect from: Mar 11, 2017, 7:00 PM EST
Expired: Mar 11, 2017, 3:56 AM EST
In force
Issued by: NWS Greenville-Spartanburg, SC

Counties Henderson County, NC, Jackson County, NC, Macon County, NC, Transylvania County, NC

The radar

The Greer radar (KGSP), 78 km from the middle of the area, began a volume at 20:31 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

Nashville Metro, TN (KBNA), launched 12:00Z, 8.6 hours before the alert went out and 343 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: 20 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 112 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 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 Mar 10, 3:11 PM EST, 22 minutes earlier.

Area forecast discussion, Mar 10, 3:11 PM EST, 22 minutes before

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Hazardous weather outlook, Mar 10, 10:00 AM EST, 5 hours 33 minutes before

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In the hours before

Special weather statement, Mar 10, 9:43 AM EST, 5 hours 50 minutes before

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Local storm report, Mar 10, 11:59 AM EST, 3 hours 34 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
Mar 10, 3:53 AM EST	Freeze Warning	GSP	Alexander, Burke, Caldwell, Catawba, Cleveland, Davie and 6 more	29 hr
Mar 10, 3:53 AM EST	Wind Advisory	GSP	Avery, Buncombe, Burke, Caldwell, Graham, Haywood and 11 more	17 hr
Mar 10, 3:55 AM EST	Winter Storm Watch	GSP	Avery, Buncombe, Burke, Caldwell, Graham, Haywood and 6 more	12 hr
Mar 10, 3:33 PM EST	Winter Storm Warning	GSP	Avery, Buncombe, Burke, Caldwell, Graham, Haywood and 9 more	36 hr
Mar 10, 3:33 PM EST	Winter Weather Advisory	GSP	Alexander, Avery, Buncombe, Burke, Cabarrus, Caldwell and 22 more	42 hr

Nearby

Winter Storm Watches in North Carolina, 2017 Every winter storm 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.