Alert archive / South Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 152, NWS Charleston, SC

July 17, 2012Colleton County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Jul 17, 2012, 2:52 PM EDT for Colleton County, South Carolina. It was in force for 68 min. 5 reports 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: Jul 17, 2012, 2:52 PM EDT (18:52 UTC)
Expired: Jul 17, 2012, 4:00 PM EDT
In force: 68 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

County Colleton County, SC

The radar

The Charleston,SC radar (KCLX), 36 km from the middle of the area, began a volume at 18:55 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
Jul 17, 2:55 PM EDT	TSTM WND DMG	1 Nne Ruffin, SC	TREE DOWN ON HIGHWAY 21 NEAR SCDOT SHED ACCORDING TO HIGHWAY PATROL.
Jul 17, 3:00 PM EDT	TSTM WND DMG	1 N Ruffin, SC	DISPATCH CENTER REPORTED A TREE DOWN ON HWY 21 AT RISHER RD.
Jul 17, 3:05 PM EDT	TSTM WND DMG	Ruffin, SC	DISPATCH CENTER REPORTED TREES DOWN ON HIGHWAY 21 AT QUARTERS DRIVE.
Jul 17, 3:20 PM EDT	TSTM WND DMG	Walterboro, SC	DISPATCH CENTER REPORTED A CAR HIT A TREE THAT FELL ON JEFFERIES BLVD IN WALTERBORO.
Jul 17, 4:04 PM EDT	TSTM WND DMG	Ruffin, SC	DISPATCH CENTER REPORTED TREES DOWN ON HIGHWAY 21 AT QUARTERS DRIVE.

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, 6.9 hours before the alert went out and 76 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: 2497 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 586 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

920 
WUUS52 KCHS 171852
SVRCHS
SCC029-172000-
/O.NEW.KCHS.SV.W.0152.120717T1852Z-120717T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
252 PM EDT TUE JUL 17 2012

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL COLLETON COUNTY IN SOUTHEAST SOUTH CAROLINA...

* UNTIL 400 PM EDT

* AT 253 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM...NEAR RUFFIN...MOVING SOUTH AT 5 MPH.

  PREPARE NOW FOR THE FOLLOWING HAZARDS...
  DAMAGING WINDS IN EXCESS OF 60 MPH...
  HAIL UP TO QUARTER SIZE...

* SOME LOCATIONS IN THE WARNING INCLUDE...
  RUFFIN...WILLIAMS...WALTERBORO...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE SHELTER AS THUNDERSTORMS APPROACH.

REPORT HAIL...DOWNED TREES...LIMBS...AND POWER LINES DIRECTLY TO THE
CHARLESTON NATIONAL WEATHER SERVICE AT 1-888-383-2024...WHEN IT IS
SAFE TO DO SO.

&&

LAT...LON 3308 8068 3283 8058 3280 8089 3282 8090
      3283 8090 3286 8093 3303 8094
TIME...MOT...LOC 1853Z 347DEG 6KT 3296 8078

$$

2 follow-up statements

749 
WWUS52 KCHS 171930
SVSCHS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
330 PM EDT TUE JUL 17 2012

SCC029-172000-
/O.CON.KCHS.SV.W.0152.000000T0000Z-120717T2000Z/
COLLETON SC-
330 PM EDT TUE JUL 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR CENTRAL COLLETON COUNTY...

AT 330 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM 6 MILES SOUTHWEST OF STOKES...MOVING
SOUTHWEST AT 10 MPH.

PREPARE NOW FOR THE FOLLOWING HAZARDS...
DAMAGING WINDS IN EXCESS OF 60 MPH...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
COLLETON...RUFFIN...WALTERBORO AND WILLIAMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS THUNDERSTORM IS CAPABLE OF PRODUCING VERY HEAVY RAIN...WHICH MAY
FLOOD ROADS...DITCHES AND LOW-LYING AREAS. AVOID FLOOD PRONE AREAS
AND DO NOT DRIVE INTO PLACES WHERE WATER COVERS THE ROAD.

TO REPORT SEVERE WEATHER SUCH AS HAIL...DOWNED TREES...LIMBS...AND
POWER LINES...PLEASE CONTACT THE CHARLESTON NATIONAL WEATHER SERVICE
TOLL FREE AT 1-888-383-2024 OR EMAIL YOUR REPORTS TO
CHS.SKYWARN@NOAA.GOV.

&&

LAT...LON 3308 8068 3283 8058 3280 8089 3282 8090
      3283 8090 3286 8093 3303 8094
TIME...MOT...LOC 1930Z 042DEG 8KT 3287 8079

$$

689 
WWUS52 KCHS 171958
SVSCHS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
358 PM EDT TUE JUL 17 2012

SCC029-172006-
/O.EXP.KCHS.SV.W.0152.000000T0000Z-120717T2000Z/
COLLETON SC-
358 PM EDT TUE JUL 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL COLLETON COUNTY WILL
EXPIRE AT 400 PM EDT...

AT 356 PM EDT...RADAR INDICATED THAT THE THUNDERSTORM WHICH PROMPTED
THE WARNING HAD WEAKENED...THUS THE SEVERE THUNDERSTORM WARNING HAS
BEEN ALLOWED TO EXPIRE.

ALTHOUGH THE SEVERE THUNDERSTORM WARNING HAS EXPIRED...THIS
THUNDERSTORM IS STILL CAPABLE OF PRODUCING GUSTY WINDS...SMALL
HAIL...FREQUENT LIGHTNING AND HEAVY RAINFALL. IF THE STORM
RESTRENGTHENS...ANOTHER SEVERE THUNDERSTORM WARNING MAY BE REQUIRED.

TO REPORT SEVERE WEATHER SUCH AS HAIL...DOWNED TREES...LIMBS...AND
POWER LINES...PLEASE CONTACT THE CHARLESTON NATIONAL WEATHER SERVICE
TOLL FREE AT 1-888-383-2024 OR EMAIL YOUR REPORTS TO
CHS.SKYWARN@NOAA.GOV.

LAT...LON 3308 8068 3283 8058 3280 8089 3282 8090
      3283 8090 3286 8093 3303 8094
TIME...MOT...LOC 1956Z 042DEG 8KT 3283 8084

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 9:03 PM EDT	Special Weather Statement	CHS	Hampton	42 min
Jul 17, 1:10 PM EDT	Severe Thunderstorm Warning	CHS	Allendale	50 min
Jul 17, 2:44 PM EDT	Special Weather Statement	CHS	Colleton	31 min
Jul 17, 3:22 PM EDT	Special Weather Statement	CHS	Hampton	38 min
Jul 17, 4:14 PM EDT	Special Weather Statement	CHS	Beaufort	31 min
Jul 17, 4:39 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Jasper	66 min
Jul 17, 4:47 PM EDT	Special Weather Statement	CHS	Dorchester	28 min
Jul 17, 4:57 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Jasper	63 min
Jul 17, 5:09 PM EDT	Severe Thunderstorm Warning	CHS	Berkeley, Charleston, Dorchester	44 min
Jul 17, 5:38 PM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston, Dorchester	82 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2012 Every severe thunderstorm warning in 2012

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.