Alert archive / South Carolina / Tornado Warnings in 2017

Tornado Warning 25, NWS Columbia, SC

September 11, 2017Bamberg County, Barnwell County, South Carolina

NWS Columbia, SC issued this tornado warning at Sep 11, 2017, 6:56 PM EDT for Bamberg County, Barnwell County, South Carolina. It was in force for 34 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: Sep 11, 2017, 6:56 PM EDT (22:56 UTC)
Expired: Sep 11, 2017, 7:30 PM EDT
In force: 34 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Bamberg County, SC, Barnwell County, SC

The radar

The Charleston,SC radar (KCLX), 72 km from the middle of the area, began a volume at 22:59 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
Sep 11, 7:01 PM EDT	TORNADO	1 Nnw Olar, SC	NWS STORM SURVEY CONFIRMS AN EF0 TORNADO TOUCHED DOWN JUST NORTHWEST OLAR, SC AND DISSIPATED APPROXIMATELY 4 MINUTES LATER NEAR GOVAN, SC. THE TORNADO WAS ASSOCIATED WITH THE REMNANTS OF HURRICANE IRMA.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 11, 1:46 PM EDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 10.9 hours before the alert went out and 124 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 547 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 902 m²/s²
0-3 km storm-relative helicity: 1081 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

825 
WFUS52 KCAE 112256
TORCAE
SCC009-011-112330-
/O.NEW.KCAE.TO.W.0025.170911T2256Z-170911T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Columbia SC
656 PM EDT MON SEP 11 2017

The National Weather Service in Columbia has issued a

* Tornado Warning for...
  Eastern Barnwell County in central South Carolina...
  Southwestern Bamberg County in central South Carolina...

* Until 730 PM EDT
    
* At 656 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Ulmer, or 11 miles south of Denmark, moving
  northwest at 40 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. 

* This dangerous storm will be near...
  Denmark around 710 PM EDT. 
  Barnwell around 715 PM EDT. 
  Blackville around 720 PM EDT. 
  Williston around 730 PM EDT. 

Other locations impacted by this tornadic thunderstorm include Elko,
Olar, Hilda and Govan.

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.

&&

LAT...LON 3312 8119 3311 8127 3336 8155 3349 8136
      3348 8130 3344 8125 3344 8123 3314 8101
      3306 8113
TIME...MOT...LOC 2256Z 142DEG 34KT 3315 8116 

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

$$

fwa

4 follow-up statements

743 
WWUS52 KCAE 112303
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
703 PM EDT MON SEP 11 2017

SCC009-011-112330-
/O.CON.KCAE.TO.W.0025.000000T0000Z-170911T2330Z/
Barnwell SC-Bamberg SC-
703 PM EDT MON SEP 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM EDT FOR EASTERN
BARNWELL AND SOUTHWESTERN BAMBERG COUNTIES...
    
At 701 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Ulmer, or 9 miles south of Denmark, moving northwest
at 40 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. 

This dangerous storm will be near...
  Denmark around 705 PM EDT. 
  Barnwell around 715 PM EDT. 
  Blackville around 720 PM EDT. 
  Williston around 730 PM EDT. 

Other locations impacted by this tornadic thunderstorm include Elko,
Olar, Hilda and Govan.

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.

&&

LAT...LON 3312 8119 3311 8127 3336 8155 3349 8136
      3348 8130 3344 8125 3344 8123 3314 8101
      3306 8113
TIME...MOT...LOC 2301Z 142DEG 34KT 3319 8120 

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

$$

fwa

987 
WWUS52 KCAE 112312
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
712 PM EDT MON SEP 11 2017

SCC009-112322-
/O.CAN.KCAE.TO.W.0025.000000T0000Z-170911T2330Z/
Bamberg SC-
712 PM EDT MON SEP 11 2017

...THE TORNADO WARNING FOR SOUTHWESTERN BAMBERG COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 1000 PM EDT for central South
Carolina.

LAT...LON 3319 8125 3337 8147 3345 8133 3334 8121
      3329 8122 3317 8122 3317 8123
TIME...MOT...LOC 2312Z 142DEG 34KT 3327 8128 

$$

SCC011-112330-
/O.CON.KCAE.TO.W.0025.000000T0000Z-170911T2330Z/
Barnwell SC-
712 PM EDT MON SEP 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM EDT FOR
NORTHEASTERN BARNWELL COUNTY...
    
At 712 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Barnwell, moving northwest at 40 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. 

This dangerous storm will be near...
  Blackville around 720 PM EDT. 
  Williston around 730 PM EDT. 

Other locations impacted by this tornadic thunderstorm include Elko
and Hilda.

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.

&&

LAT...LON 3319 8125 3337 8147 3345 8133 3334 8121
      3329 8122 3317 8122 3317 8123
TIME...MOT...LOC 2312Z 142DEG 34KT 3327 8128 

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

$$

fwa

637 
WWUS52 KCAE 112320
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
720 PM EDT MON SEP 11 2017

SCC011-112330-
/O.CON.KCAE.TO.W.0025.000000T0000Z-170911T2330Z/
Barnwell SC-
720 PM EDT MON SEP 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM EDT FOR
NORTHEASTERN BARNWELL COUNTY...
    
At 720 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Blackville, or 7 miles north of Barnwell, moving
northwest at 40 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. 

This dangerous storm will be near...
  Williston around 730 PM EDT. 

Other locations impacted by this tornadic thunderstorm include Elko.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3330 8135 3337 8147 3345 8133 3333 8128
TIME...MOT...LOC 2320Z 143DEG 35KT 3335 8134 

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

$$

fwa

064 
WWUS52 KCAE 112328
SVSCAE

Severe Weather Statement
National Weather Service Columbia SC
728 PM EDT MON SEP 11 2017

SCC011-112337-
/O.EXP.KCAE.TO.W.0025.000000T0000Z-170911T2330Z/
Barnwell SC-
728 PM EDT MON SEP 11 2017

...THE TORNADO WARNING FOR NORTHEASTERN BARNWELL COUNTY WILL EXPIRE
AT 730 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.

A tornado watch remains in effect until 1000 PM EDT for central South
Carolina.

LAT...LON 3330 8135 3337 8147 3345 8133 3333 8128
TIME...MOT...LOC 2327Z 142DEG 34KT 3340 8139 

$$

fwa

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 6:17 PM EDT	Areal Flood Advisory	CAE	Bamberg, Barnwell, Calhoun, Clarendon, Orangeburg	3 hr

Nearby

Tornado Warnings in South Carolina, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.