Alert archive / North Carolina / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 298, NWS Greenville-Spartanburg, SC

August 10, 2020Union County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 10, 2020, 5:41 PM EDT for Union County, North Carolina. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 10, 2020, 5:41 PM EDT (21:41 UTC)
Expired: Aug 10, 2020, 6:10 PM EDT
In force: 29 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Union County, NC

The radar

The Columbia radar (KCAE), 128 km from the middle of the area, began a volume at 21:43 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, 9.7 hours before the alert went out and 134 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: 104 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 30 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 severe thunderstorm 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 severe thunderstorm warning went out at Aug 10, 2:51 PM EDT, 2 hours 50 minutes earlier.

Area forecast discussion, Aug 10, 2:51 PM EDT, 2 hours 50 minutes before

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Hazardous weather outlook, Aug 10, 5:11 AM EDT, 12 hours 30 minutes before

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In the hours before

Special weather statement, Aug 10, 4:12 PM EDT, 1 hour 29 minutes before

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Special weather statement, Aug 10, 4:14 PM EDT, 1 hour 27 minutes before

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Special weather statement, Aug 10, 4:43 PM EDT, 58 minutes before

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Special weather statement, Aug 10, 4:44 PM EDT, 57 minutes before

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Local storm report, Aug 10, 4:49 PM EDT, 52 minutes before

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Special weather statement, Aug 10, 5:34 PM EDT, 7 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
Aug 10, 12:02 PM EDT	Special Weather Statement	GSP	Graham, Swain	28 min
Aug 10, 12:33 PM EDT	Special Weather Statement	GSP	Swain	27 min
Aug 10, 4:44 PM EDT	Special Weather Statement	GSP	Union	31 min
Aug 10, 5:34 PM EDT	Special Weather Statement	GSP	Union	26 min
Aug 10, 5:45 PM EDT	Special Weather Statement	GSP	Cabarrus	30 min
Aug 10, 6:09 PM EDT	Areal Flood Advisory	GSP	Cabarrus, Mecklenburg, Union	2 hr
Aug 10, 2:23 PM EDT	Special Weather Statement	GSP	Greenville	37 min
Aug 10, 2:42 PM EDT	Special Weather Statement	GSP	Union	33 min
Aug 10, 2:47 PM EDT	Special Weather Statement	GSP	Spartanburg	28 min
Aug 10, 3:41 PM EDT	Special Weather Statement	GSP	Chester	34 min
Aug 10, 3:43 PM EDT	Special Weather Statement	GSP	Spartanburg	32 min
Aug 10, 4:12 PM EDT	Special Weather Statement	GSP	Cherokee	33 min
Aug 10, 4:14 PM EDT	Special Weather Statement	GSP	York	31 min
Aug 10, 4:43 PM EDT	Special Weather Statement	GSP	Cherokee	32 min
Aug 10, 2:29 PM EDT	Special Weather Statement	GSP	Franklin, Stephens	31 min
Aug 10, 3:00 PM EDT	Special Weather Statement	GSP	Franklin	30 min
Aug 10, 3:29 PM EDT	Special Weather Statement	GSP	Elbert	31 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2020 Every severe thunderstorm warning in 2020

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.