Alert archive / South Carolina / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 200, NWS Charleston, SC

July 30, 2012Effingham County, Georgia; 4 counties in South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Jul 30, 2012, 4:27 PM EDT for Effingham County, Georgia; 4 counties in South Carolina. It was in force for 48 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: Jul 30, 2012, 4:27 PM EDT (20:27 UTC)
Expired: Jul 30, 2012, 5:15 PM EDT
In force: 48 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

Counties Effingham County, GA, Beaufort County, SC, Colleton County, SC, Hampton County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 26 km from the middle of the area, began a volume at 20:29 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 30, 4:58 PM EDT	TSTM WND DMG	Ridgeland, SC	LAW ENFORCEMENT REPORTED A POWER LINE DOWN NEAR THE INTERSECTION OF HIGHWAY 278 AND HIGHWAY 17.

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, 8.5 hours before the alert went out and 94 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: 1756 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 663 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 38 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.

343 
WUUS52 KCHS 302027
SVRCHS
GAC103-SCC013-029-049-053-302115-
/O.NEW.KCHS.SV.W.0200.120730T2027Z-120730T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
427 PM EDT MON JUL 30 2012

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL EFFINGHAM COUNTY IN SOUTHEAST GEORGIA...
  NORTHERN BEAUFORT COUNTY IN SOUTHEAST SOUTH CAROLINA...
  SOUTH CENTRAL COLLETON COUNTY IN SOUTHEAST SOUTH CAROLINA...
  EXTREME SOUTHEASTERN HAMPTON COUNTY IN SOUTHEAST SOUTH CAROLINA...
  CENTRAL JASPER COUNTY IN SOUTHEAST SOUTH CAROLINA...

* UNTIL 515 PM EDT

* AT 428 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS...ALONG A LINE EXTENDING FROM 11 MILES WEST OF
  CLYO TO POCOTALIGO...MOVING SOUTH AT 30 MPH.

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

* SOME LOCATIONS IN THE WARNING INCLUDE...
  TARBORO...POCOTALIGO...SHELDON...GARDENS CORNER...TILLMAN...
  RIDGELAND...SWITZERLAND...OLD HOUSE...LAUREL BAY...BEAUFORT MARINE
  CORPS AIR STATION...

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 3262 8085 3267 8089 3270 8083 3266 8070
      3270 8056 3249 8048 3250 8047 3245 8047
      3241 8046 3223 8116 3224 8119 3221 8124
      3218 8132 3245 8148
TIME...MOT...LOC 2028Z 346DEG 24KT 3246 8145 3263 8089

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 8:11 PM EDT	Special Weather Statement	CHS	Bulloch, Candler, Effingham, Evans, Screven	49 min
Jul 29, 8:42 PM EDT	Special Marine Warning	CHS		63 min
Jul 29, 8:59 PM EDT	Special Weather Statement	CHS	Bulloch, Candler, Effingham, Evans, Tattnall	46 min
Jul 29, 9:41 PM EDT	Special Weather Statement	CHS	Candler, Evans, Tattnall	49 min
Jul 29, 10:30 PM EDT	Special Weather Statement	CHS	Bryan, Bulloch, Candler, Evans, Long, Tattnall	45 min
Jul 30, 7:05 AM EDT	Special Marine Warning	CHS		85 min
Jul 30, 8:38 AM EDT	Special Marine Warning	CHS		2 hr
Jul 30, 10:24 AM EDT	Special Marine Warning	CHS		2 hr
Jul 30, 11:58 AM EDT	Special Marine Warning	CHS		2 hr
Jul 30, 2:39 PM EDT	Special Marine Warning	CHS		66 min
Jul 30, 2:48 PM EDT	Special Weather Statement	CHS	Liberty	27 min
Jul 30, 2:52 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Chatham, Liberty	53 min
Jul 30, 3:08 PM EDT	Special Weather Statement	CHS	Jenkins, Screven	52 min
Jul 30, 3:22 PM EDT	Special Weather Statement	CHS	McIntosh	23 min
Jul 30, 3:36 PM EDT	Special Marine Warning	CHS		98 min
Jul 30, 3:50 PM EDT	Special Weather Statement	CHS	McIntosh	25 min
Jul 30, 3:57 PM EDT	Severe Thunderstorm Warning	CHS	Effingham, Screven	63 min
Jul 30, 4:09 PM EDT	Special Weather Statement	CHS	McIntosh	36 min
Jul 30, 4:24 PM EDT	Special Weather Statement	CHS	Bulloch	51 min
Jul 30, 4:52 PM EDT	Special Weather Statement	CHS	Bulloch, Candler	23 min
Jul 30, 5:13 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Bulloch, Chatham, Effingham, Liberty	62 min
Jul 30, 5:23 PM EDT	Special Marine Warning	CHS		2 hr
Jul 30, 5:50 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Chatham, Liberty	55 min
Jul 30, 6:14 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Chatham, Liberty, Long	31 min
Jul 30, 6:32 PM EDT	Special Marine Warning	CHS		58 min
Jul 30, 6:45 PM EDT	Special Weather Statement	CHS	Liberty, Long	45 min
Jul 30, 6:51 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Liberty, Long, McIntosh	54 min
Jul 30, 7:14 PM EDT	Special Weather Statement	CHS	Long	46 min
Jul 30, 7:26 PM EDT	Special Marine Warning	CHS		47 min
Jul 30, 7:56 PM EDT	Special Marine Warning	CHS		55 min
Jul 30, 4:43 PM EDT	Special Weather Statement	CHS	Bamberg	32 min
Jul 30, 4:57 PM EDT	Special Weather Statement	CHS	Berkeley	48 min
Jul 30, 5:24 PM EDT	Severe Thunderstorm Warning	CHS	Berkeley, Colleton, Dorchester	66 min
Jul 30, 6:07 PM EDT	Severe Thunderstorm Warning	CHS	Beaufort, Charleston, Colleton, Dorchester	53 min
Jul 30, 6:35 PM EDT	Special Weather Statement	CHS	Colleton	25 min
Jul 30, 7:58 PM EDT	Special Weather Statement	CHS	Charleston	32 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2012 Severe Thunderstorm Warnings in Georgia, 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.