Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 180, NWS Charleston, SC

July 28, 2012Liberty County, McIntosh County, Georgia

NWS Charleston, SC issued this severe thunderstorm warning at Jul 28, 2012, 6:30 PM EDT for Liberty County, McIntosh County, Georgia. It was in force for 60 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 28, 2012, 6:30 PM EDT (22:30 UTC)
Expired: Jul 28, 2012, 7:30 PM EDT
In force: 60 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon

Counties Liberty County, GA, McIntosh County, GA

The radar

The Jacksonville radar (KJAX), 109 km from the middle of the area, began a volume at 22:32 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 28, 7:15 PM EDT	MARINE TSTM WIND 43	5 Se Valona, GA	SAPELO ISLAND NERRS STATION REPORTED SUSTAINED WIND OF 17 MPH WITH GUST TO 43 MPH.

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

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.5 hours before the alert went out and 107 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: 1585 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 716 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -44 m²/s²
0-3 km storm-relative helicity: -12 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.

721 
WUUS52 KCHS 282230
SVRCHS
GAC179-191-282330-
/O.NEW.KCHS.SV.W.0180.120728T2230Z-120728T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
630 PM EDT SAT JUL 28 2012

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN LIBERTY COUNTY IN SOUTHEAST GEORGIA...
  MCINTOSH COUNTY IN SOUTHEAST GEORGIA...

* UNTIL 730 PM EDT

* AT 630 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM...NEAR SHELLMAN BLUFF...MOVING SOUTHEAST AT 5
  MPH.

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

* SOME LOCATIONS IN THE WARNING INCLUDE...
  SHELLMAN BLUFF...PINE HARBOR...VALONA...BLACKBEARD ISLAND...SAPELO
  ISLAND...

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 3132 8136 3131 8143 3146 8162 3147 8162
      3151 8166 3154 8166 3164 8134 3159 8115
      3148 8119 3140 8125 3137 8125 3137 8127
      3134 8127 3132 8125 3129 8127
TIME...MOT...LOC 2230Z 304DEG 2KT 3155 8128

$$

1 follow-up statement

335 
WWUS52 KCHS 282251
SVSCHS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
651 PM EDT SAT JUL 28 2012

GAC179-191-282330-
/O.CON.KCHS.SV.W.0180.000000T0000Z-120728T2330Z/
LIBERTY GA-MCINTOSH GA-
651 PM EDT SAT JUL 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR MCINTOSH AND EXTREME SOUTHEASTERN LIBERTY COUNTIES...

AT 652 PM EDT...TRAINED WEATHER SPOTTERS REPORTED A LINE OF SEVERE
THUNDERSTORMS ALONG A LINE EXTENDING FROM SHELLMAN BLUFF TO COX...
MOVING SOUTHEAST AT 5 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...BLACKBEARD
ISLAND...CARNIGAN...COX...CRESCENT...DARIEN...EULONIA...MERIDIAN...
PINE HARBOR...RIDGEVILLE...SAPELO ISLAND...SHELLMAN BLUFF...
TOWNSEND...VALONA AND WOLF ISLAND.

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.

EXCESSIVE LIGHTNING IS OCCURRING WITH THIS THUNDERSTORM. IF
OUTDOORS... AVOID OPEN SPACES AND REMAIN LOW...KEEPING YOUR DISTANCE
FROM TALL OBJECTS SUCH AS TREES AND UTILITY POLES. IF INDOORS...STAY
AWAY FROM WINDOWS AND PLUMBING. ELECTRICAL APPLIANCES SHOULD BE
UNPLUGGED UNTIL THE THUNDERSTORM IS NO LONGER A THREAT.

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 3132 8136 3131 8143 3146 8162 3147 8162
      3151 8166 3154 8166 3164 8134 3159 8115
      3148 8119 3140 8125 3137 8125 3137 8127
      3134 8127 3132 8125 3129 8127
TIME...MOT...LOC 2252Z 322DEG 6KT 3158 8127 3141 8153

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 3:28 PM EDT	Special Weather Statement	CHS	Long	32 min
Jul 28, 3:32 PM EDT	Special Weather Statement	CHS	Bryan	28 min
Jul 28, 3:59 PM EDT	Special Weather Statement	CHS	Bryan, Chatham, Liberty	31 min
Jul 28, 4:15 PM EDT	Special Marine Warning	CHS		60 min
Jul 28, 4:18 PM EDT	Special Marine Warning	CHS		87 min
Jul 28, 4:41 PM EDT	Special Weather Statement	CHS	Chatham, Liberty	34 min
Jul 28, 5:01 PM EDT	Areal Flood Advisory	CHS	Chatham	59 min
Jul 28, 5:05 PM EDT	Severe Thunderstorm Warning	CHS	Bryan, Chatham, Liberty	55 min
Jul 28, 5:10 PM EDT	Special Marine Warning	CHS		95 min
Jul 28, 5:16 PM EDT	Special Weather Statement	CHS	Long, McIntosh	59 min
Jul 28, 5:24 PM EDT	Severe Thunderstorm Warning	CHS	Liberty, Long, McIntosh	66 min
Jul 28, 5:42 PM EDT	Special Marine Warning	CHS		2 hr
Jul 28, 5:42 PM EDT	Special Weather Statement	CHS	Chatham	33 min
Jul 28, 6:38 PM EDT	Special Marine Warning	CHS		103 min
Jul 28, 7:44 PM EDT	Special Marine Warning	CHS		2 hr

Nearby

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.