Alert archive / Georgia / Tornado Warnings in 2012

Tornado Warning 23, NWS Jacksonville, FL

July 18, 2012Glynn County, Georgia

NWS Jacksonville, FL issued this tornado warning at Jul 18, 2012, 3:27 PM EDT for Glynn County, Georgia. It was in force for 18 min. 2 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 18, 2012, 3:27 PM EDT (19:27 UTC)
Expired: Jul 18, 2012, 3:45 PM EDT
In force: 18 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Glynn County, GA

The radar

The Jacksonville radar (KJAX), 72 km from the middle of the area, began a volume at 19:28 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 18, 3:42 PM EDT	TORNADO	2 Sse Brunswick, GA	A TORNADO CONTINUED NEAR THE INTRACOASTAL WATERWAY IN THE VICINITY OF THE SIDNEY LANIER BRIDGE. THE TORNADO WAS BECOMING RAINWRAPPED AND WAS OVER MARSH AREAS.
Jul 18, 3:55 PM EDT	TSTM WND DMG	1 Nnw Jekyll Island, GA	THE JEKYLL ISLAND AUTHORITY REPORTED A FEW TREES AND POWER LINES DOWN NEAR THE CAMPGROUND ON THE ISLAND.

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, 7.5 hours before the alert went out and 71 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: 640 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 686 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -8 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.

368 
WFUS52 KJAX 181927
TORJAX
GAC127-181945-
/O.NEW.KJAX.TO.W.0023.120718T1927Z-120718T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
327 PM EDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN GLYNN COUNTY IN SOUTHEAST GEORGIA

* UNTIL 345 PM EDT

* AT 326 PM EDT...TRAINED WEATHER SPOTTERS REPORTED A WATERSPOUT     
  ON THE INTRACOASTAL WATERWAY NEAR BRUNSWICK...MOVING EAST AT 15    
  MPH. THIS WATERSPOUT HAS THE POTENTIAL TO CONTACT LOCAL LAND AREAS
  AT ANY TIME. FOR THAT REASON A TORNADO WARNING HAS BEEN ISSUED FOR
  THE LOCAL AREA.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  JEKYLL ISLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WATERSPOUTS MAY CAUSE LOCALIZED DAMAGE AS THEY MOVE ONSHORE. IF YOU
ARE IN THE PATH OF THIS WATERSPOUT...PLEASE GO TO A SAFE PLACE
IMMEDIATELY.

&&

LAT...LON 3112 8136 3113 8138 3111 8139 3108 8139
      3100 8142 3102 8145 3103 8145 3103 8148
      3106 8152 3119 8147 3117 8135
TIME...MOT...LOC 1926Z 282DEG 14KT 3110 8142

$$

SANDRIK

2 follow-up statements

292 
WWUS52 KJAX 181937
SVSJAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
337 PM EDT WED JUL 18 2012

GAC127-181945-
/O.CON.KJAX.TO.W.0023.000000T0000Z-120718T1945Z/
GLYNN GA-
337 PM EDT WED JUL 18 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM EDT FOR SOUTHERN
GLYNN COUNTY...

AT 336 PM EDT...GLYNN COUNTY EMERGENCY MANAGEMENT REPORTED THE 
WATERSPOUT CONTINUED OVER THE INTRACOASTAL WATERWAY NEAR THE SIDNEY 
LANIER BRIDGE. THIS WATERSPOUT WAS ALSO LOCATED NEAR JEKYLL 
ISLAND...MOVING EAST AT 15 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WATERSPOUTS WHICH CONTACT LAND AREAS ARE TORNADOES AND MAY BE
DANGEROUS. BOATERS AND INDIVIDUALS IN THE WARNING AREA SHOULD SEEK
SHELTER IF THE WATERSPOUT APPROACHES YOUR AREA.

&&

LAT...LON 3112 8136 3113 8138 3111 8139 3108 8139
      3100 8142 3102 8145 3103 8145 3103 8148
      3106 8152 3119 8147 3117 8135
TIME...MOT...LOC 1936Z 282DEG 14KT 3109 8138

$$

SANDRIK

026 
WWUS52 KJAX 181948
SVSJAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
348 PM EDT WED JUL 18 2012

GAC127-181957-
/O.EXP.KJAX.TO.W.0023.000000T0000Z-120718T1945Z/
GLYNN GA-
348 PM EDT WED JUL 18 2012

...THE TORNADO WARNING FOR SOUTHERN GLYNN COUNTY HAS EXPIRED...

ALTHOUGH THE WARNING IS NO LONGER IN EFFECT THE STORM IS BEING 
MONITORED FOR FUTURE INTENSIFICATION AND ADDITIONAL WARNINGS MAY BE 
NECESSARY. EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 
TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

LAT...LON 3112 8136 3113 8138 3111 8139 3108 8139
      3100 8142 3102 8145 3103 8145 3103 8148
      3106 8152 3119 8147 3117 8135
TIME...MOT...LOC 1937Z 282DEG 14KT 3109 8138

$$

SANDRIK

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 18, 3:53 PM EDT	Severe Thunderstorm Warning	JAX	Glynn	22 min
Jul 18, 4:17 PM EDT	Special Weather Statement	JAX	Glynn	28 min
Jul 18, 4:48 PM EDT	Special Weather Statement	JAX	Camden	27 min
Jul 18, 4:56 PM EDT	Special Weather Statement	JAX	Charlton	34 min
Jul 18, 5:39 PM EDT	Areal Flood Advisory	JAX	Camden, Glynn	111 min

Nearby

Tornado Warnings in Georgia, 2012 Every tornado warning in 2012 Tornadoes 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.