Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 74, NWS Columbia, SC
NWS Columbia, SC issued this severe thunderstorm warning at Aug 17, 2021, 8:40 PM EDT for Aiken County, South Carolina. It was in force for 50 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 17, 2021, 8:40 PM EDT (00:40 UTC)
- Expired
- Aug 17, 2021, 9:30 PM EDT
- In force
- 50 min
- Issued by
- NWS Columbia, SC
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Aiken County, SC
The radar
The Columbia radar (KCAE), 52 km from the middle of the area, began a volume at 00:41 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 17, 9:01 PM EDT | TSTM WND DMG | 9 N Windsor, SC | SC HIGHWAY PATROL REPORTED TREE DOWN IN ROADWAY AT FLOWING WELL ROAD AND COLEMAN BRIDGE ROAD. TIME ESTIMATED BY RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 00:00Z, 0.7 hours before the alert went out and 164 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.
- Mixed-layer CAPE
- 1990 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 710 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
The text
As transmitted.
512
WUUS52 KCAE 180040
SVRCAE
SCC003-180130-
/O.NEW.KCAE.SV.W.0074.210818T0040Z-210818T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Columbia SC
840 PM EDT Tue Aug 17 2021
The National Weather Service in Columbia has issued a
* Severe Thunderstorm Warning for...
Aiken County in central South Carolina...
* Until 930 PM EDT.
* At 840 PM EDT, a severe thunderstorm was located over New Ellenton,
or near Aiken Mall, moving northeast at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Aiken, Aiken Mall, New Ellenton, USC Aiken, Citizens Park, Aiken
Municipal Airport, Gloverville, Aiken State Park, Graniteville,
Burnettown, Wagener, Perry, Windsor, Perry Airport, Hopeland
Gardens, Savannah River Site Badge Office, Boyd Pond Park, Vaucluse
and New Holland.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of
a building.
&&
LAT...LON 3332 8176 3343 8186 3361 8184 3386 8155
3381 8151 3380 8146 3377 8143 3374 8143
3373 8141 3373 8136 3370 8127 3368 8125
3339 8157
TIME...MOT...LOC 0040Z 219DEG 29KT 3343 8172
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CJR2 follow-up statements
487
WWUS52 KCAE 180121
SVSCAE
Severe Weather Statement
National Weather Service Columbia SC
921 PM EDT Tue Aug 17 2021
SCC003-180130-
/O.CON.KCAE.SV.W.0074.000000T0000Z-210818T0130Z/
Aiken SC-
921 PM EDT Tue Aug 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR NORTHEASTERN AIKEN COUNTY...
At 919 PM EDT, a severe thunderstorm was located 9 miles north of
Aiken State Park, or 15 miles south of Batesburg-Leesville, moving
northeast at 30 mph. SC DOT reports downed trees about 8 miles SW of
Wagener.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Aiken State Park, Wagener, Perry, Perry Airport and New Holland.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of
a building.
&&
LAT...LON 3386 8155 3381 8151 3380 8146 3377 8143
3374 8143 3373 8141 3373 8136 3370 8127
3368 8125 3349 8145 3373 8170
TIME...MOT...LOC 0119Z 220DEG 27KT 3369 8147
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH
$$
CJR603
WWUS52 KCAE 180128
SVSCAE
Severe Weather Statement
National Weather Service Columbia SC
928 PM EDT Tue Aug 17 2021
SCC003-180138-
/O.EXP.KCAE.SV.W.0074.000000T0000Z-210818T0130Z/
Aiken SC-
928 PM EDT Tue Aug 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN AIKEN COUNTY WILL
EXPIRE AT 930 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.
A Tornado Watch remains in effect until 200 AM EDT for central South
Carolina.
LAT...LON 3386 8155 3381 8151 3380 8146 3377 8143
3374 8143 3373 8141 3373 8136 3370 8127
3368 8125 3349 8145 3373 8170
TIME...MOT...LOC 0128Z 219DEG 29KT 3374 8142
$$
CJRThe office that day
Everything else NWS Columbia, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 8:18 PM EDT | Special Weather Statement | CAE | Saluda | 42 min |
| Aug 17, 8:22 PM EDT | Special Weather Statement | CAE | Aiken | 53 min |
| Aug 17, 8:43 PM EDT | Tornado Warning | CAE | Lexington, Saluda | 32 min |
| Aug 17, 9:18 PM EDT | Special Weather Statement | CAE | Fairfield, Lexington | 42 min |
| Aug 17, 10:58 PM EDT | Areal Flood Advisory | CAE | Calhoun, Lexington, Richland | 2 hr |
| Aug 17, 11:45 PM EDT | Flash Flood Warning | CAE | Lexington, Richland | 2 hr |
Nearby
Severe Thunderstorm Warnings in South 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.