Alert archive / North Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 120, NWS Greenville-Spartanburg, SC

August 11, 2021Cabarrus County, North Carolina

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Aug 11, 2021, 6:29 PM EDT for Cabarrus County, North Carolina. It was in force for 20 min. 2 reports 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, 6:29 PM EDT (22:29 UTC)
Expired: Aug 11, 2021, 6:49 PM EDT
In force: 20 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Cabarrus County, NC

The radar

The Greer radar (KGSP), 158 km from the middle of the area, began a volume at 22:29 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

Time	Report	Where	Remark
Aug 11, 6:32 PM EDT	TSTM WND DMG	5 Sw Mount Pleasant, NC	PUBLIC REPORTED TREES DOWN AND A LARGE TREE BRANCH ON HOUSE ON CLUB VIEW DR.
Aug 11, 6:45 PM EDT	TSTM WND DMG	1 Ssw Concord, NC	911 CALL CENTER REPORTED SEVERAL TREES DOWN ACROSS CABARRUS COUNTY.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 3 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 10.5 hours before the alert went out and 100 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: 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.

025 
WUUS52 KGSP 112229
SVRGSP
NCC025-112300-
/O.NEW.KGSP.SV.W.0120.210811T2229Z-210811T2300Z/

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

The National Weather Service in Greenville-Spartanburg has issued a

* Severe Thunderstorm Warning for...
  Central Cabarrus County in the Piedmont of North Carolina...

* Until 700 PM EDT.

* At 629 PM EDT, a severe thunderstorm was located near Downtown
  Concord, moving southeast at 5 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 Concord, West Concord, Mt Pleasant, Charlotte Motor
  Speedway, Harrisburg and Kannapolis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 3537 8069 3548 8059 3542 8042 3526 8056
TIME...MOT...LOC 2229Z 310DEG 5KT 3539 8058 

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

$$

KRENTZ

1 follow-up statement

677 
WWUS52 KGSP 112249
SVSGSP

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

NCC025-112259-
/O.CAN.KGSP.SV.W.0120.000000T0000Z-210811T2300Z/
Cabarrus NC-
649 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CABARRUS COUNTY IS
CANCELLED...
                
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 has been cancelled.

LAT...LON 3537 8069 3548 8059 3542 8042 3526 8056
TIME...MOT...LOC 2248Z 310DEG 5KT 3537 8055 

$$

KRENTZ

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 11, 2:57 PM EDT, 3 hours 32 minutes earlier.

Area forecast discussion, Aug 11, 2:57 PM EDT, 3 hours 32 minutes before

Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
257 PM EDT Wed Aug 11 2021

.SYNOPSIS...
Abundant moisture will wrap around Atlantic high pressure and into
our area through Friday, bringing daily shower and thunderstorm
chances. A cold front will stall over the area this weekend, and the
remnants of Tropical Storm Fred may arrive early next week, possibly
resulting in periods of heavy rainfall Saturday through Monday.

&&

.NEAR TERM /THROUGH THURSDAY/...
As of 240 PM EDT Wednesday: We've already seen some robust cells
fire up over the higher terrain and foothills over the past few
hours, with coverage expected to increase thru the late afternoon
and into the evening with similar (or slightly greater) overall
coverage compared to yesterday. Otherwise, expect little change
in the overall environment today, with the sub-tropical ridge
firmly over the Southeast and an associated Bermuda High sfc
pattern. So expect another hot and muggy day, with scattered
to numerous aftn showers and thunderstorms. A few storms will
likely pulse up to severe levels, with the main threat being
damaging wind gusts. There will also continue to be a non-zero
flash flood threat, given the high PWATs and slow storm motions
expected. Tonight, convection should wane during the early evening
hours, leaving plenty of mid and high clouds that gradually thin
out overnight. Mountain valley fog will likely develop, with some
of it possibly being dense. Lows will be slightly above normal.

&&

.SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/...
As of 215 PM Wed: Mid level ridging will remain in place across the
region Thursday night through Saturday. This will keep temperatures
slightly above normal with highs in the lower to middle 90s in the
Piedmont and mid to upper 80s in the mountain valleys. Scattered
showers and thunderstorms are expected mainly during the afternoon
and evening hours both Friday and Saturday.

&&

.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
As of 215 PM Wed: A seasonably weak cold front will approach the
area from the north on Sunday. This will lead to an increased focus
for showers and thunderstorms on Sunday so pops will be fairly high
especially in the mountains. Based on the latest NHC track for Fred,
expect increased deep moisture to overspread the area on Monday and
Tuesday which may lead to some heavy rainfall especially in the
favored upslope areas. If the forecast for Fred changes, that would
lower the chance for heavy rainfall.

With the increased cloud cover and rainfall from Sunday into early
next week, expect highs to be in the 80s except for the higher
mountains.

&&

.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
At KCLT and elsewhere: Outside of the typical, diurnally-driven
summertime convection, I expect VFR conditions to prevail at most
sites thru the taf period. We've already seen some fairly robust
cells fire up over the higher terrain over the past couple of hours,
and I expect the coverage to increase thru the afternoon and into
the evening with similar (or slightly greater) overall coverage
compared to yesterday. Winds should remain generally light out of
the SW thru the period, except in the vicinity of thunderstorms.
Another round of mountain valley fog and patchy fog elsewhere is
expected again overnight and tomorrow morning, as winds remain light
and skies gradually clear out.

Outlook: Diurnal convection remains in the fcst for the rest of the
week. Fog and low stratus will be possible each morning, especially
over mountain valleys and areas primed by rainfall from the previous
evening.

Confidence Table...

            19-01Z        01-07Z        07-13Z        13-18Z
KCLT       High 100%     High 100%     High 100%     High 100%
KGSP       High 100%     High 100%     High 100%     High 100%
KAVL       High 100%     High  95%     Low   51%     Med   77%
KHKY       High 100%     High 100%     High  80%     High  95%
KGMU       High 100%     High 100%     High 100%     High 100%
KAND       High 100%     High 100%     High  95%     High  95%

The percentage reflects the number of guidance members agreeing
with the scheduled TAF issuance flight rule category. Complete hourly
experimental aviation forecast consistency tables are available at
the following link:

www.weather.gov/gsp/aviation

&&

.GSP WATCHES/WARNINGS/ADVISORIES...
GA...None.
NC...None.
SC...None.

&&

SYNOPSIS...SCW
NEAR TERM...JPT
SHORT TERM...SCW
LONG TERM...SCW
AVIATION...JPT

Hazardous weather outlook, Aug 11, 4:11 PM EDT, 2 hours 18 minutes before

Hazardous Weather Outlook
National Weather Service Greenville-Spartanburg SC
411 PM EDT Wed Aug 11 2021

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-
068>072-082-501>510-SCZ001>014-019-122015-
Rabun-Habersham-Stephens-Franklin-Hart-Elbert-Avery-Alexander-
Iredell-Davie-Madison-Yancey-Mitchell-Swain-Haywood-Buncombe-Catawba-
Rowan-Graham-Northern Jackson-Macon-Southern Jackson-Transylvania-
Henderson-Cleveland-Lincoln-Gaston-Mecklenburg-Cabarrus-Union NC-
Caldwell Mountains-Greater Caldwell-Burke Mountains-Greater Burke-
McDowell Mountains-Eastern McDowell-Rutherford Mountains-
Greater Rutherford-Polk Mountains-Eastern Polk-Oconee Mountains-
Pickens Mountains-Greenville Mountains-Greater Oconee-
Greater Pickens-Greater Greenville-Spartanburg-Cherokee-York-
Anderson-Abbeville-Laurens-Union SC-Chester-Greenwood-
411 PM EDT Wed Aug 11 2021

This Hazardous Weather Outlook is for northeast Georgia, piedmont
North Carolina, western North Carolina and upstate South Carolina.

.DAY ONE...Tonight.

Scattered thunderstorms will continue this afternoon into this
evening across portions of the forecast area. Some of these storms
could become strong to severe. Main impacts are cloud-to-ground
lightning, brief damaging wind gusts, and heavy downpours which may
lead to localized flash flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

None.

In the hours before

Special weather statement, Aug 11, 5:57 PM EDT, 32 minutes before

Special Weather Statement
National Weather Service Greenville-Spartanburg SC
557 PM EDT Wed Aug 11 2021

NCZ071-112230-
Mecklenburg NC-
557 PM EDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of central Mecklenburg
County through 630 PM EDT...

At 557 PM EDT, Doppler radar was tracking a strong thunderstorm near
Uptown Charlotte, or near The Plaza. This storm was nearly
stationary.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Uptown Charlotte, East Charlotte, The Plaza, Hidden Valley, Freedom
Park, Central Charlotte and Northeast Charlotte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3517 8084 3525 8086 3529 8075 3521 8070
TIME...MOT...LOC 2157Z 254DEG 1KT 3524 8078

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

KRENTZ

Local storm report, Aug 11, 6:03 PM EDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
603 PM EDT WED AUG 11 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0549 PM     TSTM WND DMG     MATTHEWS                35.12N 80.72W
08/11/2021                   MECKLENBURG        NC   LAW ENFORCEMENT

            LAW ENFORCEMENT REPORTED LARGE TREE LIMB DOWN ON
            PLEASANT PLAINS RD IN MATTHEWS.

&&

Special weather statement, Aug 11, 6:09 PM EDT, 20 minutes before

Special Weather Statement
National Weather Service Greenville-Spartanburg SC
609 PM EDT Wed Aug 11 2021

SCZ008-112245-
Cherokee SC-
609 PM EDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of central Cherokee
County through 645 PM EDT...

At 608 PM EDT, Doppler radar was tracking a strong thunderstorm 4
miles southeast of Gaffney. This storm was nearly stationary.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Gaffney, Cherokee Falls, Draytonville, Saratt and Kings Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3489 8159 3488 8162 3499 8173 3513 8159
      3506 8141 3505 8141 3505 8147 3503 8149
      3498 8148 3497 8149 3494 8149 3494 8148
      3487 8154
TIME...MOT...LOC 2208Z 308DEG 3KT 3502 8160

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

TDP

Special weather statement, Aug 11, 6:10 PM EDT, 19 minutes before

Special Weather Statement
National Weather Service Greenville-Spartanburg SC
610 PM EDT Wed Aug 11 2021

NCZ070-112245-
Gaston NC-
610 PM EDT Wed Aug 11 2021

...A strong thunderstorm will impact portions of northeastern Gaston
County through 645 PM EDT...

At 610 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Gastonia, or near Stanley. This storm was nearly
stationary.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Mt Holly, Stanley, Ranlo and Lowell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3528 8112 3535 8115 3539 8105 3530 8100
      3529 8103
TIME...MOT...LOC 2210Z 249DEG 1KT 3533 8109

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

KRENTZ

Local storm report, Aug 11, 6:14 PM EDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
614 PM EDT WED AUG 11 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     TSTM WND DMG     ABBEVILLE               34.18N 82.38W
08/11/2021                   ABBEVILLE          SC   LAW ENFORCEMENT

            LAW ENFORCEMENT REPORTED TREE DOWN ON VIENNA ST.

&&

Special weather statement, Aug 11, 6:16 PM EDT, 13 minutes before

Special Weather Statement
National Weather Service Greenville-Spartanburg SC
616 PM EDT Wed Aug 11 2021

NCZ057-072-112245-
Rowan NC-Cabarrus NC-
616 PM EDT Wed Aug 11 2021

...Strong thunderstorms will impact portions of Cabarrus and
southeastern Rowan Counties through 645 PM EDT...

At 616 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 5 miles east of Salisbury to 4 miles southeast
of Downtown Concord to 10 miles northeast of Uptown Charlotte.
Movement was southeast at 25 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Downtown Concord, Salisbury, Harrisburg, Spencer, Granite Quarry,
Rockwell, Mt Pleasant, Faith, Charlotte Motor Speedway and High Rock
Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3550 8030 3520 8050 3527 8067 3535 8070
      3542 8061 3573 8044 3572 8038 3572 8034
      3571 8032 3568 8033 3567 8031 3563 8029
      3562 8025 3558 8021 3555 8021 3551 8018
TIME...MOT...LOC 2216Z 304DEG 21KT 3568 8038 3537 8054 3530 8068

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

KRENTZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 12:28 PM EDT	Special Weather Statement	GSP	Henderson	47 min
Aug 11, 1:47 PM EDT	Special Weather Statement	GSP	McDowell	28 min
Aug 11, 2:51 PM EDT	Special Weather Statement	GSP	Burke	24 min
Aug 11, 3:01 PM EDT	Severe Thunderstorm Warning	GSP	Burke, Catawba	44 min
Aug 11, 3:24 PM EDT	Special Weather Statement	GSP	Polk	36 min
Aug 11, 3:51 PM EDT	Severe Thunderstorm Warning	GSP	Buncombe	39 min
Aug 11, 3:53 PM EDT	Severe Thunderstorm Warning	GSP	Iredell	52 min
Aug 11, 4:01 PM EDT	Severe Thunderstorm Warning	GSP	Polk	44 min
Aug 11, 4:03 PM EDT	Severe Thunderstorm Warning	GSP	Burke, Cleveland, Lincoln, Rutherford	42 min
Aug 11, 4:24 PM EDT	Special Weather Statement	GSP	Rutherford	36 min
Aug 11, 4:31 PM EDT	Special Weather Statement	GSP	Iredell	29 min
Aug 11, 4:40 PM EDT	Severe Thunderstorm Warning	GSP	Catawba, Iredell	50 min
Aug 11, 4:54 PM EDT	Special Weather Statement	GSP	Rutherford	36 min
Aug 11, 5:02 PM EDT	Special Weather Statement	GSP	Iredell	28 min
Aug 11, 5:08 PM EDT	Severe Thunderstorm Warning	GSP	Iredell, Rowan	34 min
Aug 11, 5:17 PM EDT	Severe Thunderstorm Warning	GSP	Cleveland	43 min
Aug 11, 5:34 PM EDT	Severe Thunderstorm Warning	GSP	Union	27 min
Aug 11, 5:46 PM EDT	Special Weather Statement	GSP	Mecklenburg	29 min
Aug 11, 5:57 PM EDT	Special Weather Statement	GSP	Mecklenburg	33 min
Aug 11, 6:08 PM EDT	Severe Thunderstorm Warning	GSP	Mecklenburg	10 min
Aug 11, 6:10 PM EDT	Special Weather Statement	GSP	Gaston	35 min
Aug 11, 6:16 PM EDT	Special Weather Statement	GSP	Cabarrus	29 min
Aug 11, 6:47 PM EDT	Special Weather Statement	GSP	Cabarrus	28 min
Aug 11, 6:59 PM EDT	Areal Flood Advisory	GSP	Cabarrus, Rowan	2 hr
Aug 11, 7:28 PM EDT	Special Weather Statement	GSP	Mecklenburg	32 min
Aug 11, 7:31 PM EDT	Severe Thunderstorm Warning	GSP	Mecklenburg	44 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2021 Every 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.