Alert archive / South Carolina / Tornado Warnings in 2017

Tornado Warning 29, NWS Charleston, SC

September 11, 2017Beaufort County, Charleston County, Colleton County, South Carolina

NWS Charleston, SC issued this tornado warning at Sep 11, 2017, 12:01 PM EDT for Beaufort County, Charleston County, Colleton County, South Carolina. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 11, 2017, 12:01 PM EDT (16:01 UTC)
Expired
Sep 11, 2017, 12:30 PM EDT
In force
29 min
Issued by
NWS Charleston, SC
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Beaufort County, SC, Charleston County, SC, Colleton County, SC

The radar

The Charleston,SC radar (KCLX), 62 km from the middle of the area, began a volume at 16:03 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Sep 10, 11:50 PM EDTTornado WatchSPC14 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 4.0 hours before the alert went out and 61 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, Charleston AFB, SC at 12:00Z on 2017-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Charleston AFB, SC at 12:00Z on 2017-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 902 square meters per square second.1939587897Sfc1 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
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.

863 
WFUS52 KCHS 111601
TORCHS
SCC013-019-029-111630-
/O.NEW.KCHS.TO.W.0029.170911T1601Z-170911T1630Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Charleston SC
1201 PM EDT MON SEP 11 2017

The National Weather Service in Charleston has issued a

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

* Until 1230 PM EDT
    
* At 1200 PM EDT, a severe thunderstorm capable of producing a
  tornado was located near Edisto Beach, moving northwest at 60 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...
  Beaufort, Edisto Beach, Bennetts Point and Dale. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Tornadoes from tropical storms or hurricanes can form and move very
quickly. TAKE COVER IMMEDIATELY! If you wait until you hear a tornado
it could be too late. Take action now to immediately protect
yourself.

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

&&

LAT...LON 3249 8027 3245 8032 3241 8034 3244 8041
      3241 8040 3237 8040 3252 8077 3270 8061
TIME...MOT...LOC 1600Z 121DEG 50KT 3245 8043 

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

$$

DPB
1 follow-up statement
535 
WWUS52 KCHS 111628
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
1228 PM EDT MON SEP 11 2017

SCC013-019-029-111638-
/O.EXP.KCHS.TO.W.0029.000000T0000Z-170911T1630Z/
Beaufort SC-Charleston SC-Colleton SC-
1228 PM EDT MON SEP 11 2017

...THE TORNADO WARNING FOR BEAUFORT...CHARLESTON AND COLLETON
COUNTIES WILL EXPIRE AT 1230 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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Charleston.

LAT...LON 3249 8027 3245 8032 3241 8034 3244 8041
      3241 8040 3237 8040 3252 8077 3270 8061
TIME...MOT...LOC 1628Z 121DEG 50KT 3265 8083 

$$

DPB

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 11:30 PM EDTHurricane WarningCHS9 hr
Sep 11, 3:12 AM EDTSpecial Marine WarningCHS2 hr
Sep 11, 3:12 AM EDTSpecial Marine WarningCHS63 min
Sep 11, 3:49 AM EDTSpecial Marine WarningCHS56 min
Sep 11, 4:19 AM EDTSpecial Marine WarningCHS86 min
Sep 11, 5:18 AM EDTSpecial Marine WarningCHS117 min
Sep 11, 7:01 AM EDTSpecial Marine WarningCHS119 min
Sep 11, 7:41 AM EDTSpecial Marine WarningCHS2 hr
Sep 11, 7:45 AM EDTSpecial Marine WarningCHS2 hr
Sep 11, 8:16 AM EDTFlash Flood WarningCHSJasper8 hr
Sep 11, 8:36 AM EDTAreal Flood AdvisoryCHSBeaufort, Jasper84 min
Sep 11, 9:22 AM EDTFlash Flood WarningCHSBeaufort, Jasper8 hr
Sep 11, 9:31 AM EDTAreal Flood AdvisoryCHSAllendale, Hampton, Jasper119 min
Sep 11, 9:41 AM EDTSpecial Marine WarningCHS2 hr
Sep 11, 9:50 AM EDTSpecial Marine WarningCHS115 min
Sep 11, 10:31 AM EDTSpecial Marine WarningCHS119 min
Sep 11, 10:44 AM EDTFlash Flood WarningCHSAllendale, Hampton, Jasper7 hr
Sep 11, 10:45 AM EDTRiver Flood WarningCHSBerkeley, Georgetown, Williamsburg24 hr
Sep 11, 11:24 AM EDTFlash Flood Warning EmergencyCHSBerkeley, Charleston, Colleton, Dorchester15 hr
Sep 11, 11:38 AM EDTSpecial Marine WarningCHS2 hr
Sep 11, 11:44 AM EDTAreal Flood AdvisoryCHSAllendale2 hr
Sep 11, 11:51 AM EDTAreal Flood AdvisoryCHSAllendale, Colleton, Dorchester, Hampton114 min
Sep 11, 12:23 PM EDTSpecial Marine WarningCHS2 hr
Sep 11, 12:37 PM EDTTornado WarningCHSCharleston23 min
Sep 11, 12:40 PM EDTSpecial Marine WarningCHS65 min
Sep 11, 12:54 PM EDTFlash Flood WarningCHSAllendale, Colleton, Dorchester, Hampton9 hr
Sep 11, 12:59 PM EDTTornado WarningCHSCharleston, Dorchester31 min
Sep 11, 1:10 PM EDTTornado WarningCHSCharleston, Colleton35 min
Sep 11, 1:49 PM EDTTornado WarningCHSCharleston, Colleton, Dorchester26 min
Sep 11, 1:53 PM EDTTornado WarningCHSCharleston, Dorchester24 min
Sep 11, 2:11 PM EDTSpecial Marine WarningCHS94 min
Sep 11, 2:45 PM EDTTornado WarningCHSBeaufort, Colleton30 min
Sep 11, 2:46 PM EDTTornado WarningCHSBerkeley, Charleston, Dorchester16 min
Sep 11, 3:10 PM EDTFlash Flood WarningCHSBerkeley, Colleton, Dorchester7 hr
Sep 11, 3:58 PM EDTSpecial Marine WarningCHS32 min
Sep 11, 4:43 PM EDTSpecial Marine WarningCHS62 min
Sep 11, 4:48 PM EDTAreal Flood WarningCHSJasper7 hr
Sep 11, 5:16 PM EDTAreal Flood WarningCHSAllendale, Beaufort, Hampton, Jasper7 hr

Nearby

Tornado Warnings in South Carolina, 2017Every tornado warning in 2017Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.