Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 53, NWS Jacksonville, FL

April 21, 2011Camden County, Charlton County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 21, 2011, 7:45 PM EDT for Camden County, Charlton County, Georgia. It was in force for 21 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: Apr 21, 2011, 7:45 PM EDT (23:45 UTC)
Expired: Apr 21, 2011, 8:06 PM EDT
In force: 21 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Camden County, GA, Charlton County, GA

The radar

The Jacksonville radar (KJAX), 48 km from the middle of the area, began a volume at 23:47 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 11.8 hours before the alert went out and 47 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: 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.

166 
WUUS52 KJAX 212345
SVRJAX
GAC039-049-220030-
/O.NEW.KJAX.SV.W.0053.110421T2345Z-110422T0030Z/

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

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CHARLTON COUNTY IN SOUTHEAST GEORGIA
  CENTRAL CAMDEN COUNTY IN SOUTHEAST GEORGIA

* UNTIL 830 PM EDT

* AT 745 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 10 MILES WEST OF WOODBINE...AND MOVING EAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   WOODBINE BY 815 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3079 8164 3092 8197 3109 8192 3103 8157
      3090 8156
TIME...MOT...LOC 2345Z 288DEG 13KT 3098 8186

$$

CARROLL

1 follow-up statement

670 
WWUS52 KJAX 220006
SVSJAX

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

GAC039-049-220016-
/O.CAN.KJAX.SV.W.0053.000000T0000Z-110422T0030Z/
CHARLTON GA-CAMDEN GA-
806 PM EDT THU APR 21 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CAMDEN AND
NORTHEASTERN CHARLTON COUNTIES IS CANCELLED...

ALTHOUGH THE WARNING IS NO LONGER IN EFFECT...SMALL HAIL...
OCCASIONAL CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 30 TO 40 MPH 
CAN BE EXPECTED ALONG.

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

LAT...LON 3079 8164 3092 8197 3109 8192 3103 8157
      3090 8156
TIME...MOT...LOC 0006Z 288DEG 13KT 3096 8178

$$

CARROLL

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 21, 3:04 PM EDT, 4 hours 41 minutes earlier.

Area forecast discussion, Apr 21, 3:04 PM EDT, 4 hours 41 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
304 PM EDT THU APR 21 2011

.SHORT TERM...
THE MID/UPPER RIDGE WILL BUILD OVER THE SOUTHEAST STATES BY
FRIDAY...PUSHING THE FRONTAL BOUNDARY BACK TO THE NORTH. THE
SURFACE BERMUDA RIDGE AXIS WILL BUILD BACK OVER THE REGION INTO
THE WEEKEND. BREEZY ONSHORE FLOW WILL KEEP THE BEACHES COOLER IN
THE LOW/MID 80S WHILE TEMPS INLAND WILL REACH INTO THE UPPER
80S...AND DROP INTO THE 60S TONIGHT. EXPECT SCATTERED STORMS AGAIN
FOR SE GA TOMORROW AS THE FRONT DEPARTS.

SATURDAY SEES A DROP IN POPS...THOUGH ISOLATED AFTERNOON/EVENING
THUNDERSTORMS ARE POSSIBLE CLOSE TO THE I-75 CORRIDOR IN NE FL.
TEMPS SATURDAY WILL CLIMB INTO THE UPPER 80S/LOWER 90S INLAND BUT
WILL STAY IN THE MID 80S ALONG THE COAST. NIGHTTIME LOWS WILL DROP
INTO THE 60S.

.LONG TERM...SUNDAY THROUGH WEDNESDAY...
BERMUDA HIGH PRESSURE WILL BUILD BACK ACROSS THE FORECAST AREA
WITH PERSISTENT SOUTHEASTERLY FLOW. BY EARLY NEXT WEEK...THE
MID/UPPER RIDGE WILL BE OVER THE AREA AND WILL MOVE EAST OVER THE
ATLANTIC AS A STRONG TROUGH PUSHES INTO THE SOUTHERN PLAINS. AS
FOR POPS...POTENTIAL EXISTS FOR LATE DAY SEA BREEZE INTERACTIONS.
POPS INCREASE AS THE FORECAST PERIOD PROGRESSES...LARGELY TO
ACCOUNT FOR INFLUX OF MOISTURE AS THE TROUGH MOVES INTO THE AREA.
MAX TEMPS WILL BE IN THE UPPER 80S INLAND. MIN TEMPS WILL BE IN
THE 60S.

&&

.AVIATION...
MOST OF THE THUNDERSTORM ACTIVITY LATE THIS AFTERNOON INTO THIS
EVENING SHOULD REMAIN WEST AND NORTH OF THE TAF SITES. UPDATES
WILL BE MADE AS THE SITUATION UNFOLDS IF IT APPEARS ONE OF THE
TERMINALS WILL BE DIRECTLY IMPACTED. OTHERWISE VFR CONDITIONS ARE
EXPECTED WITH PERHAPS SOME MVFR CONDITIONS IN PATCHY FOG AT GNV
AND VQQ TONIGHT.

&&

.MARINE...
NO HEADLINES EXPECTED UNTIL POSSIBLY SATURDAY AFTERNOON WHEN
MARGINAL SCEC CONDITIONS COULD BE REALIZED WELL OFFSHORE DUE TO
INCREASING ELY SWELLS WHICH MAY RESULT IN COMBINED SEAS OF NEAR 6
FT.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  63  86  63  88 /  40  40  10  10
SSI  67  78  67  81 /  30  30  10  10
JAX  65  84  65  85 /  20  30  10  10
SGJ  66  82  67  83 /  10  20  10  10
GNV  62  88  63  88 /  10  20  10  20
OCF  62  89  63  88 /  10  20  10  20

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
GA...NONE.
AM...NONE.
&&

PRESNALL/SHULER/KEEGAN

Hazardous weather outlook, Apr 21, 7:00 PM EDT, 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
700 PM EDT THU APR 21 2011

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-220900-
HAMILTON-SUWANNEE-COLUMBIA-BAKER-NASSAU-DUVAL-UNION-BRADFORD-CLAY-
ST JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-COFFEE-
JEFF DAVIS-BACON-APPLING-WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY-
INLAND GLYNN-COASTAL GLYNN-ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN-
COASTAL CAMDEN-
700 PM EDT THU APR 21 2011

THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.

.DAY ONE...TODAY AND TONIGHT...

...ISOLATED STRONG TO SEVERE THUNDERSTORMS THROUGH THE EVENING
ACROSS PORTIONS OF SOUTHEAST GEORGIA...

ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON
AND EVENING. THE FAVORED AREA FOR STORMS WILL BE NORTH OF INTERSTATE
10. SOME OF THESE STORMS MAY BE STRONG TO SEVERE...WIND GUSTS OVER
50 MPH AND HAIL OVER ONE INCH IN DIAMETER.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

ISOLATED THUNDERSTORMS ARE POSSIBLE FRIDAY AFTERNOON AND EVENING.
SCATTERED THUNDERSTORMS WILL BE POSSIBLE ACROSS SOUTHEAST GEORGIA
ON FRIDAY.

A MODERATE RISK OF RIP CURRENTS IS EXPECTED ON FRIDAY. AN
ELEVATED RISK OF RIP CURRENTS WILL CONTINUE INTO THE WEEKEND DUE
TO INCREASING SWELLS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE REQUESTED TO SELF-ACTIVATE IF WARNINGS ARE ISSUED
FOR THEIR AREA.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE
IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX.

MKT/SEC

In the hours before

Special weather statement, Apr 21, 5:27 PM EDT, 2 hours 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
527 PM EDT THU APR 21 2011

GAZ136-153-212215-
INLAND GLYNN-WAYNE-
527 PM EDT THU APR 21 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR SOUTHEASTERN
WAYNE AND NORTHWESTERN GLYNN COUNTIES FOR STRONG WINDS AND SMALL HAIL
VALID UNTIL 615 PM EDT...

AT 527 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED OVER EVERETT...OR 13 MILES SOUTHEAST OF
GARDI...MOVING EAST AT 10 MPH. THIS STRONG THUNDERSTORM WILL AFFECT
AREAS AROUND THALMANN...MOUNT PLEASANT AND EVERETT THROUGH 615 PM
EDT. HAIL UP TO THREE QUARTER INCH IN DIAMETER AND GUSTY WINDS OF 45
TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

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

LAT...LON 3131 8150 3130 8151 3128 8173 3133 8173
      3134 8174 3145 8178 3150 8164 3149 8162
      3147 8161 3145 8161 3140 8158 3134 8148
TIME...MOT...LOC 2127Z 256DEG 7KT 3139 8165

CARROLL

Local storm report, Apr 21, 5:50 PM EDT, 1 hour 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
550 PM EDT THU APR 21 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0545 PM     HAIL             EVERETT                 31.39N 81.64W
04/21/2011  E1.75 INCH       GLYNN              GA   LAW ENFORCEMENT

            GOLF BALL SIZE HAIL REPORTED IN EVERETT.

&&

CARROLL

Special weather statement, Apr 21, 5:52 PM EDT, 1 hour 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
552 PM EDT THU APR 21 2011

GAZ152-165-212230-
BRANTLEY-INLAND CAMDEN-
552 PM EDT THU APR 21 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR EASTERN
BRANTLEY AND NORTHWESTERN CAMDEN COUNTIES FOR STRONG WINDS AND SMALL
HAIL VALID UNTIL 630 PM EDT...

AT 552 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 2 MILES NORTHEAST OF NAHUNTA...MOVING
SOUTHEAST AT 5 MPH. THIS STRONG THUNDERSTORM WILL AFFECT AREAS
AROUND RAYBON...NAHUNTA...HICKOX AND ATKINSON THROUGH 630 PM EDT.
HAIL UP TO THREE QUARTER INCH IN DIAMETER AND GUSTY WINDS OF 45 TO 55
MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

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

LAT...LON 3102 8177 3105 8195 3123 8208 3132 8192
      3119 8177 3117 8178 3116 8176 3115 8176
      3115 8172 3114 8172
TIME...MOT...LOC 2152Z 326DEG 4KT 3122 8195

CARROLL

Local storm report, Apr 21, 6:40 PM EDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
640 PM EDT THU APR 21 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0619 PM     HAIL             5 E NAHUNTA             31.21N 81.89W
04/21/2011  E0.50 INCH       BRANTLEY           GA   PUBLIC

            PUBLIC REPORTED MARBLE SIZE HAIL EAST OF NAHUNTA.

&&

CARROLL

Special weather statement, Apr 21, 6:51 PM EDT, 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
651 PM EDT THU APR 21 2011

GAZ152-153-165-212330-
BRANTLEY-INLAND CAMDEN-INLAND GLYNN-
651 PM EDT THU APR 21 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR NORTHEASTERN
BRANTLEY...WESTERN GLYNN AND NORTHERN CAMDEN COUNTIES FOR STRONG
WINDS AND SMALL HAIL VALID UNTIL 730 PM EDT...

AT 651 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 4 MILES NORTHWEST OF WAYNESVILLE...OR 11
MILES NORTHEAST OF NAHUNTA...MOVING SOUTHEAST AT 10 MPH. THIS STRONG
THUNDERSTORM WILL AFFECT AREAS AROUND ATKINSON AND WAYNESVILLE
THROUGH 730 PM EDT. HAIL UP TO THREE QUARTER INCH IN DIAMETER AND
GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR
DAMAGE. HEAVY RAINFALL WILL PRODUCE PONDING OF WATER ON ROADWAYS AND
MINOR FLOODING OF LOW-LYING AREAS.

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

LAT...LON 3134 8179 3125 8183 3124 8171 3116 8163
      3106 8182 3131 8192 3136 8181
TIME...MOT...LOC 2251Z 335DEG 8KT 3127 8181

CARROLL

Special weather statement, Apr 21, 6:58 PM EDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
658 PM EDT THU APR 21 2011

GAZ152-164-165-212345-
BRANTLEY-CHARLTON-INLAND CAMDEN-
658 PM EDT THU APR 21 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR SOUTHERN
BRANTLEY...NORTHEASTERN CHARLTON AND NORTHWESTERN CAMDEN COUNTIES FOR
STRONG WINDS AND SMALL HAIL VALID UNTIL 745 PM EDT...

AT 658 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
CENTERED 4 MILES NORTHEAST OF WINOKUR...OR 9 MILES SOUTH OF
NAHUNTA...MOVING EAST AT 15 MPH. WILL ALSO AFFECT AREAS AROUND
WINOKUR...HICKOX AND TARBORO THROUGH 745 PM EDT. HAIL UP TO THREE
QUARTER INCH IN DIAMETER AND GUSTY WINDS OF 45 TO 55 MPH CAN BE
EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

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

LAT...LON 3119 8188 3101 8180 3098 8205 3113 8208
TIME...MOT...LOC 2258Z 257DEG 11KT 3108 8196

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 5:27 PM EDT	Special Weather Statement	JAX	Glynn	48 min
Apr 21, 5:39 PM EDT	Severe Thunderstorm Warning	JAX	Glynn, Wayne	36 min
Apr 21, 5:52 PM EDT	Special Weather Statement	JAX	Brantley	38 min
Apr 21, 6:04 PM EDT	Areal Flood Advisory	JAX	Glynn, Wayne	86 min
Apr 21, 6:17 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Glynn, Wayne	43 min
Apr 21, 6:51 PM EDT	Special Weather Statement	JAX	Brantley	39 min
Apr 21, 6:58 PM EDT	Special Weather Statement	JAX	Brantley	47 min
Apr 21, 7:00 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Camden, Glynn	45 min
Apr 21, 7:02 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Camden, Charlton	43 min
Apr 21, 7:48 PM EDT	Special Weather Statement	JAX	Wayne	42 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.