Alert archive / South Carolina / Tornado Warnings in 2017

Tornado Warning 36, NWS Charleston, SC

September 11, 2017Berkeley County, Charleston County, Dorchester County, South Carolina

NWS Charleston, SC issued this tornado warning at Sep 11, 2017, 2:46 PM EDT for Berkeley County, Charleston County, Dorchester County, South Carolina. It was in force for 16 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, 2:46 PM EDT (18:46 UTC)
Expired
Sep 11, 2017, 3:02 PM EDT
In force
16 min
Issued by
NWS Charleston, SC
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Berkeley County, SC, Charleston County, SC, Dorchester County, SC

The radar

The Charleston,SC radar (KCLX), 98 km from the middle of the area, began a volume at 18:45 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

TimeReportWhereRemark
Sep 11, 2:48 PM EDTTORNADO1 Ssw Charleston Airpor, SCEF-0. WIDTH 60 YD. LENGTH 1.47 MI. A TORNADO ASSOCIATED WITH TS IRMA TOUCHED DOWN NEAR JOINT BASE CHARLESTON FLIGHT LINE AND TRAVELED NORTH-NORTHWEST. THE TORNADO PUSHED BACK THE EDGE OF THE ROOF ON THE CONTROL TOWER...DAMAGED FACIA OF A NEARBY BUILDING AND DA

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.

IssuedProductOfficeLasted
Sep 11, 1:46 PM EDTTornado WatchSPC10 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 6.8 hours before the alert went out and 4 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.

871 
WFUS52 KCHS 111846
TORCHS
SCC015-019-035-111915-
/O.NEW.KCHS.TO.W.0036.170911T1846Z-170911T1915Z/

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

The National Weather Service in Charleston has issued a

* Tornado Warning for portions of...
  Charleston County in southeastern South Carolina...
  Berkeley County in southeastern South Carolina...
  Dorchester County in southeastern South Carolina...

* Until 315 PM EDT
    
* At 246 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over I-26/I-526 Interchange, moving northwest at 30
  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...
  Charleston, North Charleston, Summerville, Goose Creek, Hanahan,
  Middleton Place, Archdale and Slands Bridge.

This warning includes...
 I-26 between mile markers 199 and 219.
 I-526 between mile markers 12 and 25.

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 3287 7989 3279 8002 3296 8030 3308 8012
TIME...MOT...LOC 1846Z 134DEG 25KT 3286 8002 

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

$$

DPB
1 follow-up statement
381 
WWUS52 KCHS 111902
SVSCHS

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

SCC015-019-035-111912-
/O.CAN.KCHS.TO.W.0036.000000T0000Z-170911T1915Z/
Charleston SC-Berkeley SC-Dorchester SC-
302 PM EDT MON SEP 11 2017

...THE TORNADO WARNING FOR CHARLESTON...BERKELEY AND DORCHESTER
COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and have exited the warned area. Therefore the warning has
been cancelled.

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

LAT...LON 3287 7989 3279 8002 3296 8030 3308 8012
TIME...MOT...LOC 1900Z 134DEG 25KT 3294 8012 

$$

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, 12:01 PM EDTTornado WarningCHSBeaufort, Charleston, Colleton29 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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.