Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 49, NWS Jacksonville, FL

April 21, 2011Glynn County, Wayne County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 21, 2011, 5:39 PM EDT for Glynn County, Wayne County, Georgia. It was in force for 36 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
Apr 21, 2011, 5:39 PM EDT (21:39 UTC)
Expired
Apr 21, 2011, 6:15 PM EDT
In force
36 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

Counties Glynn County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 96 km from the middle of the area, began a volume at 21:40 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

TimeReportWhereRemark
Apr 21, 5:45 PM EDTHAIL 1.75Everett, GAGOLF BALL SIZE HAIL REPORTED IN EVERETT.

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, 9.7 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-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2011-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 812 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2011-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
812 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
1139 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
30 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.

097 
WUUS52 KJAX 212139
SVRJAX
GAC127-305-212215-
/O.NEW.KJAX.SV.W.0049.110421T2139Z-110421T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
539 PM EDT THU APR 21 2011

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN WAYNE COUNTY IN SOUTHEAST GEORGIA
  NORTHERN GLYNN COUNTY IN SOUTHEAST GEORGIA

* UNTIL 615 PM EDT

* AT 539 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
  LOCATED NEAR EVERETT...OR 11 MILES WEST OF DARIEN...AND MOVING   
  EAST AT 5 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT.

&&

LAT...LON 3115 8165 3142 8176 3148 8161 3145 8161
      3143 8160 3134 8147 3134 8144 3131 8142
      3131 8139 3132 8138 3132 8136
TIME...MOT...LOC 2139Z 335DEG 4KT 3137 8162

$$

CARROLL
1 follow-up statement
230 
WWUS52 KJAX 212158
SVSJAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
558 PM EDT THU APR 21 2011

GAC127-305-212215-
/O.CON.KJAX.SV.W.0049.000000T0000Z-110421T2215Z/
WAYNE GA-GLYNN GA-
558 PM EDT THU APR 21 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHERN GLYNN AND SOUTHEASTERN WAYNE COUNTIES...

AT 556 PM EDT...LOCAL LAW ENFORCEMENT REPORTED A SEVERE THUNDERSTORM 
PRODUCING GOLF BALL SIZE HAIL...AND CAPABLE OF PRODUCING DAMAGING 
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR EVERETT...OR 
11 MILES WEST OF DARIEN...MOVING SOUTHEAST AT 5 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
THALMANN AND BOYS ESTATE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

HAIL UP TO THE SIZE OF GOLF BALLS HAS BEEN REPORTED IN EVERETT WITH 
THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE 
ACTION TO PROTECT LIFE AND PROPERTY.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT.

&&

LAT...LON 3115 8165 3142 8176 3148 8161 3145 8161
      3143 8160 3134 8147 3134 8144 3131 8142
      3131 8139 3132 8138 3132 8136
TIME...MOT...LOC 2156Z 335DEG 4KT 3135 8161

$$

CARROLL

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 21, 5:27 PM EDTSpecial Weather StatementJAXGlynn48 min
Apr 21, 5:52 PM EDTSpecial Weather StatementJAXBrantley38 min
Apr 21, 6:04 PM EDTAreal Flood AdvisoryJAXGlynn, Wayne86 min
Apr 21, 6:17 PM EDTSevere Thunderstorm WarningJAXBrantley, Glynn, Wayne43 min
Apr 21, 6:51 PM EDTSpecial Weather StatementJAXBrantley39 min
Apr 21, 6:58 PM EDTSpecial Weather StatementJAXBrantley47 min
Apr 21, 7:00 PM EDTSevere Thunderstorm WarningJAXBrantley, Camden, Glynn45 min
Apr 21, 7:02 PM EDTSevere Thunderstorm WarningJAXBrantley, Camden, Charlton43 min
Apr 21, 7:45 PM EDTSevere Thunderstorm WarningJAXCamden, Charlton21 min
Apr 21, 7:48 PM EDTSpecial Weather StatementJAXWayne42 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011Every severe thunderstorm warning in 2011

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.