Alert archive / North Carolina / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 233, NWS Greenville-Spartanburg, SC

July 21, 20204 counties in North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Jul 21, 2020, 2:59 PM EDT for 4 counties in North Carolina. It was in force for 31 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: Jul 21, 2020, 2:59 PM EDT (18:59 UTC)
Expired: Jul 21, 2020, 3:30 PM EDT
In force: 31 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Buncombe County, NC, Henderson County, NC, Polk County, NC, Rutherford County, NC

The radar

The Greer radar (KGSP), 58 km from the middle of the area, began a volume at 18:59 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.0 hours before the alert went out and 305 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: 503 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 1197 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: -10 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 Jul 21, 2:52 PM EDT, 7 minutes earlier.

Area forecast discussion, Jul 21, 2:52 PM EDT, 7 minutes before

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Hazardous weather outlook, Jul 21, 2:56 PM EDT, 3 minutes before

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In the hours before

Special weather statement, Jul 21, 2:14 PM EDT, 45 minutes before

Special Weather Statement
National Weather Service Greenville-Spartanburg SC
214 PM EDT Tue Jul 21 2020

NCZ064-065-SCZ003-211845-
Transylvania NC-Henderson NC-Greenville Mountains SC-
214 PM EDT Tue Jul 21 2020

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN TRANSYLVANIA...
SOUTH CENTRAL HENDERSON AND NORTHWESTERN GREENVILLE COUNTIES UNTIL
245 PM EDT...

At 214 PM EDT, Doppler radar was tracking a strong thunderstorm 4
miles southeast of Brevard, or near Dupont State Forest, moving east
at 5 mph.

Locations to be impacted include...
Brevard, Etowah, Rosman, Pleasant Ridge State Park, Jones Gap State
Park, Dupont State Forest, Caesars Head State Park, Penrose,
Connestee and Crab Creek.

Wind gusts up to 40 mph, pea size hail and very heavy rainfall rates
up to 2 inches per hour will be possible in these areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio and tv
stations, as well as local cable tv outlets for additional
information and possible warnings from the National Weather Service.

&&

LAT...LON 3508 8247 3506 8257 3507 8257 3507 8259
      3506 8259 3507 8260 3506 8264 3506 8270
      3505 8275 3507 8277 3507 8278 3508 8278
      3508 8281 3523 8284 3534 8254
TIME...MOT...LOC 1814Z 266DEG 6KT 3521 8266

MOORE

Special weather statement, Jul 21, 2:25 PM EDT, 34 minutes before

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Special weather statement, Jul 21, 2:29 PM EDT, 30 minutes before

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Special weather statement, Jul 21, 2:32 PM EDT, 27 minutes before

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Special weather statement, Jul 21, 2:43 PM EDT, 16 minutes before

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Special weather statement, Jul 21, 2:54 PM EDT, 5 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
Jul 20, 8:22 PM EDT	Special Weather Statement	GSP	Jackson	38 min
Jul 21, 1:04 PM EDT	Special Weather Statement	GSP	Haywood	26 min
Jul 21, 1:21 PM EDT	Special Weather Statement	GSP	Transylvania	24 min
Jul 21, 1:43 PM EDT	Severe Thunderstorm Warning	GSP	Jackson	47 min
Jul 21, 1:52 PM EDT	Severe Thunderstorm Warning	GSP	Buncombe, Haywood	38 min
Jul 21, 2:14 PM EDT	Special Weather Statement	GSP	Transylvania	31 min
Jul 21, 2:32 PM EDT	Special Weather Statement	GSP	Jackson	28 min
Jul 21, 2:34 PM EDT	Severe Thunderstorm Warning	GSP	Haywood, Jackson	41 min
Jul 21, 2:40 PM EDT	Severe Thunderstorm Warning	GSP	Henderson	50 min
Jul 21, 2:52 PM EDT	Heat Advisory	GSP	Cabarrus, Davie, Iredell, Mecklenburg, Rowan, Union	29 hr
Jul 21, 3:08 PM EDT	Special Weather Statement	GSP	Avery	37 min
Jul 21, 3:16 PM EDT	Special Weather Statement	GSP	Yancey	29 min
Jul 21, 3:31 PM EDT	Special Weather Statement	GSP	Polk	29 min
Jul 21, 3:44 PM EDT	Severe Thunderstorm Warning	GSP	Avery, McDowell, Mitchell, Yancey	31 min
Jul 21, 3:46 PM EDT	Special Weather Statement	GSP	Caldwell	29 min
Jul 21, 4:03 PM EDT	Special Weather Statement	GSP	Lincoln	27 min
Jul 21, 4:09 PM EDT	Severe Thunderstorm Warning	GSP	Avery, Burke, Caldwell, McDowell	51 min
Jul 21, 4:32 PM EDT	Special Weather Statement	GSP	Rutherford	28 min
Jul 21, 4:40 PM EDT	Severe Thunderstorm Warning	GSP	Cleveland, Rutherford	50 min
Jul 21, 4:51 PM EDT	Special Weather Statement	GSP	Cabarrus	24 min
Jul 21, 4:56 PM EDT	Severe Thunderstorm Warning	GSP	Burke, Caldwell	49 min
Jul 21, 5:00 PM EDT	Special Weather Statement	GSP	Mecklenburg	30 min
Jul 21, 5:23 PM EDT	Severe Thunderstorm Warning	GSP	Iredell, Rowan	38 min
Jul 21, 5:28 PM EDT	Special Weather Statement	GSP	Cabarrus	32 min
Jul 21, 5:31 PM EDT	Special Weather Statement	GSP	Gaston, Lincoln	29 min
Jul 21, 5:36 PM EDT	Special Weather Statement	GSP	Cleveland	24 min
Jul 21, 5:42 PM EDT	Severe Thunderstorm Warning	GSP	Mecklenburg	33 min
Jul 21, 5:54 PM EDT	Severe Thunderstorm Warning	GSP	Cabarrus	51 min
Jul 21, 5:56 PM EDT	Severe Thunderstorm Warning	GSP	Alexander, Burke, Caldwell, Catawba	38 min
Jul 21, 6:03 PM EDT	Severe Thunderstorm Warning	GSP	Gaston, Lincoln, Mecklenburg	29 min
Jul 21, 6:30 PM EDT	Special Weather Statement	GSP	Catawba, Lincoln	30 min
Jul 21, 6:33 PM EDT	Special Weather Statement	GSP	Lincoln	27 min
Jul 21, 6:59 PM EDT	Special Weather Statement	GSP	Catawba	31 min
Jul 21, 7:04 PM EDT	Severe Thunderstorm Warning	GSP	Gaston, Mecklenburg	41 min
Jul 21, 7:39 PM EDT	Special Weather Statement	GSP	Cabarrus	36 min
Jul 21, 7:45 PM EDT	Special Weather Statement	GSP	Mecklenburg	30 min
Jul 21, 2:29 PM EDT	Special Weather Statement	GSP	Pickens	31 min
Jul 21, 2:54 PM EDT	Special Weather Statement	GSP	Oconee	36 min
Jul 21, 3:04 PM EDT	Special Weather Statement	GSP	Pickens	26 min
Jul 21, 3:06 PM EDT	Special Weather Statement	GSP	Abbeville	24 min
Jul 21, 3:29 PM EDT	Special Weather Statement	GSP	Greenville, Oconee, Pickens	31 min
Jul 21, 3:40 PM EDT	Severe Thunderstorm Warning	GSP	Greenville	35 min
Jul 21, 3:50 PM EDT	Severe Thunderstorm Warning	GSP	Greenville	25 min
Jul 21, 3:59 PM EDT	Special Weather Statement	GSP	Spartanburg	31 min
Jul 21, 4:11 PM EDT	Special Weather Statement	GSP	Pickens	34 min
Jul 21, 4:15 PM EDT	Severe Thunderstorm Warning	GSP	Anderson, Greenville, Pickens	45 min
Jul 21, 4:18 PM EDT	Special Weather Statement	GSP	Abbeville, Greenwood	27 min
Jul 21, 4:29 PM EDT	Severe Thunderstorm Warning	GSP	Greenville, Spartanburg	46 min
Jul 21, 4:36 PM EDT	Severe Thunderstorm Warning	GSP	Abbeville, Greenwood, Laurens	39 min
Jul 21, 4:43 PM EDT	Special Weather Statement	GSP	Anderson	32 min
Jul 21, 5:05 PM EDT	Special Weather Statement	GSP	Spartanburg	25 min
Jul 21, 5:07 PM EDT	Special Weather Statement	GSP	Cherokee	23 min
Jul 21, 5:17 PM EDT	Special Weather Statement	GSP	Laurens	28 min
Jul 21, 5:38 PM EDT	Special Weather Statement	GSP	Cherokee	37 min
Jul 21, 5:40 PM EDT	Special Weather Statement	GSP	Union	35 min
Jul 21, 5:47 PM EDT	Special Weather Statement	GSP	Laurens	28 min
Jul 21, 5:50 PM EDT	Special Weather Statement	GSP	York	25 min
Jul 21, 5:59 PM EDT	Severe Thunderstorm Warning	GSP	York	46 min
Jul 21, 6:16 PM EDT	Special Weather Statement	GSP	Union	29 min
Jul 21, 6:46 PM EDT	Special Weather Statement	GSP	York	29 min
Jul 21, 6:48 PM EDT	Special Weather Statement	GSP	York	27 min
Jul 21, 7:41 PM EDT	Special Weather Statement	GSP	Chester	34 min
Jul 21, 2:25 PM EDT	Special Weather Statement	GSP	Elbert	35 min
Jul 21, 2:43 PM EDT	Special Weather Statement	GSP	Habersham	32 min
Jul 21, 3:55 PM EDT	Special Weather Statement	GSP	Franklin, Hart, Stephens	35 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.