Alert archive / Georgia / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 310, NWS Jacksonville, FL

August 27, 2015Echols County, Georgia; Hamilton County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 27, 2015, 6:54 PM EDT for Echols County, Georgia; Hamilton County, Florida. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 27, 2015, 6:54 PM EDT (22:54 UTC)
Expired: Aug 27, 2015, 7:33 PM EDT
In force: 39 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Hamilton County, FL, Echols County, GA

The radar

The Moody AFB radar (KVAX), 38 km from the middle of the area, began a volume at 22:57 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.9 hours before the alert went out and 112 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: 542 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: -7 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.

259 
WUUS52 KJAX 272254
SVRJAX
FLC047-GAC101-272345-
/O.NEW.KJAX.SV.W.0310.150827T2254Z-150827T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
654 PM EDT THU AUG 27 2015

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN HAMILTON COUNTY IN NORTHERN FLORIDA...
  SOUTH CENTRAL ECHOLS COUNTY IN SOUTHEASTERN GEORGIA...

* UNTIL 745 PM EDT

* AT 654 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. THIS STORM WAS LOCATED NEAR JASPER...AND MOVING NORTH AT
  10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  JASPER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY. LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

&&

LAT...LON 3067 8281 3046 8275 3040 8290 3063 8304
TIME...MOT...LOC 2254Z 159DEG 11KT 3052 8287 

$$

PETERSON

1 follow-up statement

631 
WWUS52 KJAX 272333
SVSJAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
733 PM EDT THU AUG 27 2015

FLC047-GAC101-272343-
/O.CAN.KJAX.SV.W.0310.000000T0000Z-150827T2345Z/
HAMILTON FL-ECHOLS GA-
733 PM EDT THU AUG 27 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HAMILTON AND
SOUTH CENTRAL ECHOLS COUNTIES IS CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS
AND EXITED THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.
HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 3067 8281 3046 8275 3040 8290 3063 8304
TIME...MOT...LOC 2330Z 159DEG 11KT 3063 8292 

$$

PETERSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 5:20 PM EDT	Special Weather Statement	JAX	Wayne	40 min
Aug 27, 6:04 PM EDT	Special Weather Statement	JAX	Pierce	41 min
Aug 27, 6:48 PM EDT	Special Weather Statement	JAX	Pierce	42 min
Aug 27, 7:32 PM EDT	Special Weather Statement	JAX	Echols	43 min
Aug 27, 7:45 PM EDT	Special Weather Statement	JAX	Ware	45 min
Aug 26, 8:00 PM EDT	Special Weather Statement	JAX	Baker	45 min
Aug 26, 8:08 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Bradford, Union	37 min
Aug 26, 8:30 PM EDT	Special Marine Warning	JAX		2 hr
Aug 26, 8:41 PM EDT	Special Weather Statement	JAX	Baker	49 min
Aug 26, 8:53 PM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Clay	97 min
Aug 26, 10:05 PM EDT	Areal Flood Advisory	JAX	Alachua, Putnam	85 min
Aug 27, 3:46 PM EDT	Special Weather Statement	JAX	Saint Johns	29 min
Aug 27, 3:54 PM EDT	Special Weather Statement	JAX	Gilchrist	36 min
Aug 27, 4:22 PM EDT	Areal Flood Advisory	JAX	Gilchrist	83 min
Aug 27, 5:00 PM EDT	Special Weather Statement	JAX	Suwannee	45 min
Aug 27, 5:15 PM EDT	Severe Thunderstorm Warning	JAX	Suwannee	30 min
Aug 27, 5:48 PM EDT	Special Weather Statement	JAX	Suwannee	42 min
Aug 27, 6:44 PM EDT	Special Weather Statement	JAX	Hamilton	46 min
Aug 27, 7:58 PM EDT	Special Weather Statement	JAX	Bradford	32 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2015 Severe Thunderstorm Warnings in Florida, 2015 Every severe thunderstorm warning in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.