Alert archive / South Carolina / Tornado Warnings in 2020

Tornado Warning 18, NWS Charleston, SC

August 24, 2020Colleton County, South Carolina

NWS Charleston, SC issued this tornado warning at Aug 24, 2020, 5:03 PM EDT for Colleton County, South Carolina. It was in force for 42 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 24, 2020, 5:03 PM EDT (21:03 UTC)
Expired: Aug 24, 2020, 5:45 PM EDT
In force: 42 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Colleton County, SC

The radar

The Charleston,SC radar (KCLX), 52 km from the middle of the area, began a volume at 21:03 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 24, 5:25 PM EDT	TSTM WND DMG	Jacksonboro, SC	TREE DOWN ON HWY 17 NEAR HWY 64.

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 12:00Z, 9.1 hours before the alert went out and 49 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: 1107 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

511 
WFUS52 KCHS 242103
TORCHS
SCC029-242145-
/O.NEW.KCHS.TO.W.0018.200824T2103Z-200824T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Charleston SC
503 PM EDT Mon Aug 24 2020

The National Weather Service in Charleston has issued a

* Tornado Warning for portions of...
  Colleton County in southeastern South Carolina...

* Until 545 PM EDT.
    
* At 503 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Ashepoo, moving north at 10 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Jacksonboro, Ashepoo, Green Pond and Ritter. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If you are outdoors, in a mobile
home, or in a vehicle, move to the closest substantial shelter and
protect yourself from flying debris.

&&

LAT...LON 3277 8044 3276 8045 3273 8045 3264 8047
      3263 8058 3282 8073 3287 8041
TIME...MOT...LOC 2103Z 173DEG 7KT 3268 8054 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

2 follow-up statements

504 
WWUS52 KCHS 242111
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
511 PM EDT Mon Aug 24 2020

SCC029-242145-
/O.CON.KCHS.TO.W.0018.000000T0000Z-200824T2145Z/
Colleton SC-
511 PM EDT Mon Aug 24 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM EDT FOR COLLETON
COUNTY...
    
At 511 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Ashepoo, moving northeast at 10 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Jacksonboro and Ashepoo. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Report damage directly to the Charleston National Weather Service at
1-888-383-2024 when it is safe to do so.

&&

LAT...LON 3277 8044 3276 8045 3273 8045 3266 8047
      3265 8055 3283 8064 3287 8041
TIME...MOT...LOC 2111Z 203DEG 9KT 3272 8051 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

122 
WWUS52 KCHS 242115
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
515 PM EDT Mon Aug 24 2020

SCC029-242145-
/O.CON.KCHS.TO.W.0018.000000T0000Z-200824T2145Z/
Colleton SC-
515 PM EDT Mon Aug 24 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM EDT FOR COLLETON
COUNTY...
    
At 514 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Ashepoo and Jacksonboro, moving north at 10 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Jacksonboro and Ashepoo. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Report damage directly to the Charleston National Weather Service at
1-888-383-2024 when it is safe to do so.

&&

LAT...LON 3277 8044 3276 8045 3273 8045 3267 8047
      3267 8053 3284 8060 3287 8041
TIME...MOT...LOC 2114Z 189DEG 7KT 3273 8049 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 24, 1:59 PM EDT	Special Weather Statement	CHS	Allendale	31 min
Aug 24, 4:32 PM EDT	Special Weather Statement	CHS	Colleton	43 min
Aug 24, 5:22 PM EDT	Tornado Warning	CHS	Charleston, Colleton, Dorchester	53 min
Aug 24, 5:28 PM EDT	Special Weather Statement	CHS	Berkeley	32 min
Aug 24, 6:07 PM EDT	Areal Flood Advisory	CHS	Charleston, Colleton	83 min
Aug 24, 6:58 PM EDT	Areal Flood Advisory	CHS	Beaufort, Berkeley, Charleston, Colleton, Dorchester	2 hr
Aug 24, 7:20 PM EDT	Special Weather Statement	CHS	Charleston	25 min
Aug 24, 7:37 PM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston	113 min

Nearby

Tornado Warnings in South Carolina, 2020 Every tornado warning in 2020 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.