Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 103, NWS Greenville-Spartanburg, SC

August 11, 2021Iredell County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 11, 2021, 3:53 PM EDT for Iredell County, North Carolina. It was in force for 52 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 11, 2021, 3:53 PM EDT (19:53 UTC)
Expired
Aug 11, 2021, 4:45 PM EDT
In force
52 min
Issued by
NWS Greenville-Spartanburg, SC
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Iredell County, NC

The radar

The Roanoke radar (KFCX), 128 km from the middle of the area, began a volume at 19:55 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.

What was reported inside it

TimeReportWhereRemark
Aug 11, 4:11 PM EDTTSTM WND DMG3 Ssw Union Grove, NCEMERGENCY MNGR REPORTED TREES DOWN ON TRUMPET BRANCH RD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.9 hours before the alert went out and 90 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 2021-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 653 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 2021-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 square meters per square second.1939Sfc1 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
653 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
1352 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
-21 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

866 
WUUS52 KGSP 111953
SVRGSP
NCC097-112045-
/O.NEW.KGSP.SV.W.0103.210811T1953Z-210811T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Greenville-Spartanburg SC
353 PM EDT Wed Aug 11 2021

The National Weather Service in Greenville-Spartanburg has issued a

* Severe Thunderstorm Warning for...
  Northeastern Iredell County in the Piedmont of North Carolina...

* Until 445 PM EDT.

* At 352 PM EDT, a severe thunderstorm was located 15 miles south of
  Ronda, or near Love Valley, and is nearly stationary.

  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...
  Harmony, Love Valley, Union Grove, Turnersburg and Olin. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Brief damaging winds will blow down trees and power lines over small
areas. A brief period of large hail is also possible. Seek shelter
inside an interior room.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

Please report damaging winds, hail, or flooding to the National
Weather Service 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 3605 8089 3605 8078 3602 8069 3598 8070
      3580 8088 3593 8102 3596 8100 3599 8100
      3601 8102 3606 8097
TIME...MOT...LOC 1952Z 309DEG 4KT 3600 8093 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

TDP
1 follow-up statement
414 
WWUS52 KGSP 112037
SVSGSP

Severe Weather Statement
National Weather Service Greenville-Spartanburg SC
437 PM EDT Wed Aug 11 2021

NCC097-112047-
/O.EXP.KGSP.SV.W.0103.000000T0000Z-210811T2045Z/
Iredell NC-
437 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN IREDELL COUNTY
WILL EXPIRE AT 445 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.

LAT...LON 3605 8089 3605 8078 3602 8069 3598 8070
      3580 8088 3593 8102 3596 8100 3599 8100
      3601 8102 3606 8097
TIME...MOT...LOC 2037Z 309DEG 4KT 3597 8089 

$$

WJM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 12:28 PM EDTSpecial Weather StatementGSPHenderson47 min
Aug 11, 1:47 PM EDTSpecial Weather StatementGSPMcDowell28 min
Aug 11, 2:51 PM EDTSpecial Weather StatementGSPBurke24 min
Aug 11, 3:01 PM EDTSevere Thunderstorm WarningGSPBurke, Catawba44 min
Aug 11, 3:24 PM EDTSpecial Weather StatementGSPPolk36 min
Aug 11, 3:51 PM EDTSevere Thunderstorm WarningGSPBuncombe39 min
Aug 11, 4:01 PM EDTSevere Thunderstorm WarningGSPPolk44 min
Aug 11, 4:03 PM EDTSevere Thunderstorm WarningGSPBurke, Cleveland, Lincoln, Rutherford42 min
Aug 11, 4:24 PM EDTSpecial Weather StatementGSPRutherford36 min
Aug 11, 4:31 PM EDTSpecial Weather StatementGSPIredell29 min
Aug 11, 4:40 PM EDTSevere Thunderstorm WarningGSPCatawba, Iredell50 min
Aug 11, 4:54 PM EDTSpecial Weather StatementGSPRutherford36 min
Aug 11, 5:02 PM EDTSpecial Weather StatementGSPIredell28 min
Aug 11, 5:08 PM EDTSevere Thunderstorm WarningGSPIredell, Rowan34 min
Aug 11, 5:17 PM EDTSevere Thunderstorm WarningGSPCleveland43 min
Aug 11, 5:34 PM EDTSevere Thunderstorm WarningGSPUnion27 min
Aug 11, 5:46 PM EDTSpecial Weather StatementGSPMecklenburg29 min
Aug 11, 5:57 PM EDTSpecial Weather StatementGSPMecklenburg33 min
Aug 11, 6:08 PM EDTSevere Thunderstorm WarningGSPMecklenburg10 min
Aug 11, 6:10 PM EDTSpecial Weather StatementGSPGaston35 min
Aug 11, 6:16 PM EDTSpecial Weather StatementGSPCabarrus29 min
Aug 11, 6:29 PM EDTSevere Thunderstorm WarningGSPCabarrus20 min
Aug 11, 6:47 PM EDTSpecial Weather StatementGSPCabarrus28 min
Aug 11, 6:59 PM EDTAreal Flood AdvisoryGSPCabarrus, Rowan2 hr
Aug 11, 7:28 PM EDTSpecial Weather StatementGSPMecklenburg32 min
Aug 11, 7:31 PM EDTSevere Thunderstorm WarningGSPMecklenburg44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.