Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 70, NWS Greenville-Spartanburg, SC

July 17, 2021Buncombe County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Jul 17, 2021, 5:01 PM EDT for Buncombe County, North Carolina. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 17, 2021, 5:01 PM EDT (21:01 UTC)
Expired
Jul 17, 2021, 5:45 PM EDT
In force
44 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Buncombe County, NC

The radar

The Knoxville radar (KMRX), 93 km from the middle of the area, began a volume at 21:00 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, 9.0 hours before the alert went out and 241 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, Greensboro/Hi Pt, NC at 12:00Z on 2021-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 966 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2021-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 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
966 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
843 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
19 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

244 
WUUS52 KGSP 172101
SVRGSP
NCC021-172145-
/O.NEW.KGSP.SV.W.0070.210717T2101Z-210717T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Greenville-Spartanburg SC
501 PM EDT Sat Jul 17 2021

The National Weather Service in Greenville-Spartanburg has issued a

* Severe Thunderstorm Warning for...
  Central Buncombe County in western North Carolina...

* Until 545 PM EDT.

* At 501 PM EDT, a severe thunderstorm was located 5 miles northwest
  of Downtown Asheville, or near Woodfin, moving east at 10 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor hail damage to vehicles is expected. Expect wind 
           damage to trees and power lines.

* Locations impacted include...
  Downtown Asheville, East Asheville, West Asheville, North
  Asheville, Woodfin, Swannanoa, Weaverville, Leicester, B.R.
  Parkway-East Asheville To Craggy Gardens and UNC-Asheville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Scattered trees and power lines will be blown down in the warned
area. Seek shelter inside an interior room.

This storm is also producing extremely heavy rainfall. Flooding of
drainage ditches and low lying areas may occur. Small streams will
rise rapidly. Do not drive through areas where water is flowing over
the road.

Please report damaging winds, hail, or flooding to the National
Weather Service Greenville-Spartanburg by calling toll free, 1, 800,
2 6 7, 8 1 0 1, or by posting on our Facebook page, or Tweet it using
hashtag nwsgsp. Your message should describe the event and the
specific location where it occurred.

&&

LAT...LON 3559 8232 3554 8265 3571 8273 3573 8269
      3573 8267 3574 8267 3580 8252 3580 8247
      3581 8246 3581 8243
TIME...MOT...LOC 2101Z 250DEG 8KT 3565 8261 

HAIL...1.00IN
WIND...60MPH
 
$$

RWH
2 follow-up statements
624 
WWUS52 KGSP 172126
SVSGSP

Severe Weather Statement
National Weather Service Greenville-Spartanburg SC
526 PM EDT Sat Jul 17 2021

NCC021-172145-
/O.CON.KGSP.SV.W.0070.000000T0000Z-210717T2145Z/
Buncombe NC-
526 PM EDT Sat Jul 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR CENTRAL BUNCOMBE COUNTY...

At 526 PM EDT, a severe thunderstorm was located 6 miles east of
Downtown Asheville, or near Warren Wilson College, moving east at 20
mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vehicles is expected. Expect wind 
         damage to trees and power lines.

Locations impacted include...
Downtown Asheville, East Asheville, North Asheville, Woodfin,
Swannanoa, Weaverville, B.R. Parkway-East Asheville To Craggy
Gardens, UNC-Asheville, Warren Wilson College and Barnardsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Scattered trees and power lines will be blown down in the warned
area. Seek shelter inside an interior room.

Please report damaging winds, hail, or flooding to the National
Weather Service Greenville-Spartanburg by calling toll free, 1, 800,
2 6 7, 8 1 0 1, or by posting on our Facebook page, or Tweet it using
hashtag nwsgsp. Your message should describe the event and the
specific location where it occurred.

&&

LAT...LON 3556 8254 3566 8261 3569 8259 3575 8253
      3581 8243 3559 8232
TIME...MOT...LOC 2126Z 256DEG 16KT 3559 8243 

HAIL...1.00IN
WIND...60MPH
 
$$

RWH
919 
WWUS52 KGSP 172140
SVSGSP

Severe Weather Statement
National Weather Service Greenville-Spartanburg SC
540 PM EDT Sat Jul 17 2021

NCC021-172150-
/O.EXP.KGSP.SV.W.0070.000000T0000Z-210717T2145Z/
Buncombe NC-
540 PM EDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BUNCOMBE COUNTY WILL
EXPIRE AT 545 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire. However gusty winds 
and heavy rain are still possible with this thunderstorm.

LAT...LON 3556 8254 3566 8261 3569 8259 3575 8253
      3581 8243 3559 8232
TIME...MOT...LOC 2140Z 250DEG 8KT 3560 8240 

$$

RWH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 8:05 PM EDTSpecial Weather StatementGSPMadison25 min
Jul 16, 8:29 PM EDTSpecial Weather StatementGSPMadison31 min
Jul 16, 11:04 PM EDTSpecial Weather StatementGSPGraham26 min
Jul 17, 1:05 PM EDTSpecial Weather StatementGSPAlexander25 min
Jul 17, 1:30 PM EDTSpecial Weather StatementGSPAlexander30 min
Jul 17, 1:33 PM EDTSevere Thunderstorm WarningGSPAlexander, Catawba, Iredell42 min
Jul 17, 4:01 PM EDTSpecial Weather StatementGSPCaldwell29 min
Jul 17, 4:16 PM EDTSpecial Weather StatementGSPBuncombe29 min
Jul 17, 4:19 PM EDTSpecial Weather StatementGSPTransylvania26 min
Jul 17, 4:24 PM EDTSevere Thunderstorm WarningGSPBurke, Caldwell51 min
Jul 17, 4:58 PM EDTSpecial Weather StatementGSPBuncombe32 min
Jul 17, 5:06 PM EDTSpecial Weather StatementGSPHenderson24 min
Jul 17, 5:36 PM EDTSpecial Weather StatementGSPMcDowell24 min
Jul 17, 5:56 PM EDTSpecial Weather StatementGSPRutherford34 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2021Every severe thunderstorm warning in 2021

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.