Alert archive / Georgia / Special Weather Statements in 2011

Special Weather Statement, NWS Atlanta, GA

August 21, 2011Wilkes County, Georgia

NWS Atlanta, GA issued this special weather statement at Aug 21, 2011, 10:45 PM EDT for Wilkes County, Georgia. It was in force for 30 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 21, 2011, 10:45 PM EDT (02:45 UTC)
Expired: Aug 21, 2011, 11:15 PM EDT
In force: 30 min
Issued by: NWS Atlanta, GA

County Wilkes County, GA

The radar

The Greer radar (KGSP), 124 km from the middle of the area, began a volume at 02:48 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 2.8 hours before the alert went out and 183 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: 2527 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 1171 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

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

NWS Atlanta, GA wrote its last area forecast discussion before this special weather statement went out at Aug 21, 10:09 PM EDT, 36 minutes earlier.

Area forecast discussion, Aug 21, 10:09 PM EDT, 36 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1009 PM EDT SUN AUG 21 2011

.UPDATE...
COVERAGE OF THUNDERSTORMS HAS BEGUN TO DECREASE THIS
EVENING...STORMS MAY CONTINUE PAST MIDNIGHT THOUGH. QUICK UPDATE
TO DROP POPS ACROSS MOST OF NORTH GEORGIA. LEFT SLIGHT CHANCE
ACROSS THE REST OF THE CWA.

TEMPERATURES WERE A LITTLE COOLER ACROSS THE ATLANTA METRO AREA
DUE TO THE RAIN EARLIER THIS EVENING BUT GENERALLY THINK THE MIN
TEMPS ARE ON TRACK SO JUST MINOR TWEAKS TO HOURLY TEMPS.

11

&&

.PREV DISCUSSION...

SHORT TERM /TONIGHT THROUGH TUESDAY NIGHT/...
/ISSUED 355 PM EDT SUN AUG 21 2011/
MODELS STILL RETROGRADING UPPER RIDGE WESTWARD DURING THE SHORT
TERM FORECAST PERIOD...BUT AS I EXPECTED EARLIER...THEY ARE NOT
PUSHING IT AS FAR WEST AS PREVIOUS RUNS. ULTIMATE EFFECT IS THE
SAME FOR NORTH AND CENTRAL GEORGIA THROUGH THIS PERIOD...WEAK COLD
FRONT IN NORTH GEORGIA CONTINUES TO SINK SOUTH TONIGHT. CURRENTLY
THE CONVECTIVE COVERAGE ACROSS THE FORECAST AREA IS
UNDERWHELMING...BUT I AM NOT COMFORTABLE DROPPING POPS TOO LOW
THIS EVENING. I AM ACTUALLY GOING A BIT ABOVE MOS POPS TONIGHT BUT
NOT ABOVE CHANCE CATEGORY. DRIER AIR FILTERS IN FROM THE NORTH
THROUGH TUESDAY...BUT SOME MARGINAL INSTABILITY AND MOISTURE
LINGERS ALONG OUR SOUTHERN BORDER TO KEEP LOW POPS THERE THROUGH
THE PERIOD.

LONG TERM /WEDNESDAY THROUGH SUNDAY/...
/ISSUED 355 PM EDT SUN AUG 21 2011/
LONG TERM FORECAST PERIOD REMAINS A GOOD BIT UNCERTAIN WITH RESPECT
TO TRACK OF IRENE. MEDIUM RANGE MODELS CONTINUE TO TREND EASTWARD
WITH THE TRACK OF THE SYSTEM...WHICH IS CONSISTENT WITH THE TREND OF
NOT RETROGRADING THE WESTERN U.S. UPPER RIDGE AS FAR WESTWARD. THE GFS
AND ECMWF ARE ALSO BUILDING THIS RIDGE BACK EAST SOONER. 00Z ECMWF
RUN FROM YESTERDAY ACTUALLY BRIDGED THE WESTERN U.S. UPPER RIDGE AND
THE WESTERN ATLANTIC RIDGE CAUSING IRENE TO STOP ITS RE-CURVE AND
VEER WEST INTO CENTRAL GEORGIA BRIEFLY. THANKFULLY THAT TREND WAS
SHORT LIVED...AND THE 12Z GFS AND ECMWF ARE ONCE AGAIN IN QUITE
REMARKABLE AGREEMENT WITH RESPECT TO THIS SYSTEM. GEORGIA IS
CURRENTLY BEYOND THE END OF THE OFFICIAL TRACK FROM THE TPC...BUT
CURRENT GFS/ECMWF SOLUTION WOULD PROVIDE MINIMAL EFFECT FOR ALL BUT
OUR FAR EAST AND SOUTHEAST COUNTIES. FOR NOW I AM MAKING NO CHANGES
TO THE CURRENT EXTENDED GRIDS.

AVIATION...
00Z UPDATE...
/ISSUED 801 PM EDT SUN AUG 21 2011/
CONVECTION WAS LATER THAN EXPECTED BUT TSRA HAS AFFECTED MOST OF
THE ATL AND SURROUNDING TAF SITES THIS EVENING. POTENTIAL EXISTS
FOR THIS TO LINGER FOR ANOTHER 2 TO 3 HOURS BEFORE SHIFTING
SOUTHWARD. ONLY CARRYING CB FOR MCN AND CSG AT THIS TIME BUT
CONVERGENCE ZONE COULD ALLOW DEVELOPMENT INTO THE LATE EVENING AND
WILL NEED TO MONITOR FOR TEMPO INCLUSION. OTHERWISE...DRIER
CONDITIONS TO INFILTRATE THE AREA WITH JUST SCT VFR CLOUDS
EXPECTED FOR MONDAY AFTERNOON.

//ATL CONFIDENCE...00Z UPDATE...
MEDIUM ON TSRA ENDING TIME
HIGH ON REMAINING ELEMENTS

DEESE

&&

.PRELIMINARY POINT TEMPS/POPS...
ATHENS          71  93  67  93 /  20  10  10  10
ATLANTA         74  91  69  90 /  20  10   5  10
BLAIRSVILLE     66  88  62  85 /  10  10   5  10
CARTERSVILLE    69  92  63  90 /  10  10   5  10
COLUMBUS        74  94  71  92 /  20  30  10  10
GAINESVILLE     72  90  68  89 /  20  10   5  10
MACON           72  93  69  92 /  20  30  20  10
ROME            69  92  63  90 /  10  10   5  10
PEACHTREE CITY  69  91  64  90 /  20  10  10  10
VIDALIA         74  94  73  92 /  20  40  30  20

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

Hazardous weather outlook, Aug 21, 4:45 PM EDT, 6 hours before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
445 PM EDT SUN AUG 21 2011

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-221200-
BALDWIN-BANKS-BARROW-BARTOW-BIBB-BLECKLEY-BUTTS-CARROLL-CATOOSA-
CHATTAHOOCHEE-CHATTOOGA-CHEROKEE-CLARKE-CLAYTON-COBB-COWETA-
CRAWFORD-CRISP-DADE-DAWSON-DEKALB-DODGE-DOOLY-DOUGLAS-EMANUEL-
FANNIN-FAYETTE-FLOYD-FORSYTH-GILMER-GLASCOCK-GORDON-GREENE-
GWINNETT-HALL-HANCOCK-HARALSON-HARRIS-HEARD-HENRY-HOUSTON-JACKSON-
JASPER-JEFFERSON-JOHNSON-JONES-LAMAR-LAURENS-LUMPKIN-MACON-
MADISON-MARION-MERIWETHER-MONROE-MONTGOMERY-MORGAN-MURRAY-
MUSCOGEE-NEWTON-NORTH FULTON-OCONEE-OGLETHORPE-PAULDING-PEACH-
PICKENS-PIKE-POLK-PULASKI-PUTNAM-ROCKDALE-SCHLEY-SOUTH FULTON-
SPALDING-STEWART-SUMTER-TALBOT-TALIAFERRO-TAYLOR-TELFAIR-TOOMBS-
TOWNS-TREUTLEN-TROUP-TWIGGS-UNION-UPSON-WALKER-WALTON-WARREN-
WASHINGTON-WEBSTER-WHEELER-WHITE-WHITFIELD-WILCOX-WILKES-
WILKINSON-
445 PM EDT SUN AUG 21 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH AND CENTRAL GEORGIA.

.DAY ONE...THIS EVENING AND TONIGHT
SCATTERED THUNDERSTORMS ARE EXPECTED.

.SYNOPSIS...
A WEAK SURFACE TROUGH WILL PUSH ACROSS NORTH GEORGIA AND INTO
CENTRAL GEORGIA. A SERIES OF UPPER DISTURBANCES WILL INTERACT WITH
THE SURFACE BOUNDARY TO PRODUCE SCATTERED SHOWERS AND THUNDERSTORMS.

.PRIMARY HAZARDS...
WIND GUSTS TO 45 MPH...BRIEF HEAVY RAIN AND FREQUENT CLOUD TO
GROUND LIGHTNING WILL BE THE PRIMARY HAZARDS ASSOCIATED WITH MOST
THUNDERSTORMS THAT DEVELOP TODAY. HOWEVER...THERE IS A SLIGHT
CHANCE A FEW STORMS COULD BECOME SEVERE... WITH WIND GUSTS UP TO 60
MPH.

.DISCUSSION...
A WEAK SURFACE TROUGH OF LOW PRESSURE WILL MEANDER IN CENTRAL
GEORGIA. THE SURFACE TROUGH WILL PROVIDE THE FOCUS FOR THUNDERSTORMS
AS A SERIES OF UPPER DISTURBANCES TRAVERSE THE STATE. CAPE VALUES
BETWEEN 2000 AND 2500 J/KG AND SOME MID LEVEL DRY AIR COULD COMBINE
TO PRODUCE STRONG THUNDERSTORM WIND GUSTS AT TIMES. THE THUNDERSTORM
ACTIVITY IS EXPECTED TO GREATLY DIMINISH BY MIDNIGHT WITH LOSS OF
DAYTIME HEATING. HOWEVER... ISOLATED SHOWERS MAY LINGER OVERNIGHT
ACROSS CENTRAL GEORGIA NEAR THE SURFACE TROUGH.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY
THUNDERSTORMS ARE POSSIBLE ACROSS MAINLY CENTRAL GEORGIA ON
MONDAY AND TUESDAY. THUNDERSTORMS ARE POSSIBLE ACROSS NORTH AND
CENTRAL GEORGIA WEDNESDAY THROUGH SATURDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED THROUGH TONIGHT.

In the hours before

Local storm report, Aug 21, 8:41 PM EDT, 2 hours 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
841 PM EDT SUN AUG 21 2011

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

0730 PM     LIGHTNING        5 WNW CUMMING           34.23N 84.21W
08/21/2011                   FORSYTH            GA   PUBLIC

            LIGHTNING DESTROYED A 3 FOOT DIAMETER POPLAR TREE. TOP
            HALF OF THE TREE EXPLODED.

&&

20

Special weather statement, Aug 21, 8:54 PM EDT, 1 hour 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
854 PM EDT SUN AUG 21 2011

GAZ053-067-220130-
854 PM EDT SUN AUG 21 2011

...SIGNIFICANT WEATHER ADVISORY FOR 35 MPH WINDS IN MERIWETHER AND
COWETA COUNTIES UNTIL 930 PM EDT...

AT 850 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER ROCKY MOUNT...MOVING SOUTHEAST AT 20 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE PEA SIZED HAIL...FREQUENT
CLOUD TO GROUND LIGHTNING AND WIND GUSTS TO 35 MPH AS IT MOVES ACROSS
MERIWETHER AND COWETA COUNTIES THROUGH 930 PM EDT. SOME LOCATIONS IN
THE PATH OF THIS STORM INCLUDE ROCKY MOUNT...ALVATON...WOOSTER...
GAY...IMLAC AND WOODBURY. BRIEF HEAVY DOWNPOURS WILL CAUSE PONDING OF
WATER ON ROADWAYS.

&&

LAT...LON 3327 8468 3315 8451 3310 8453 3309 8452
      3308 8453 3305 8452 3304 8454 3297 8452
      3296 8453 3296 8452 3292 8453 3291 8452
      3288 8455 3314 8483
TIME...MOT...LOC 0054Z 314DEG 17KT 3314 8467

Local storm report, Aug 21, 9:10 PM EDT, 1 hour 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
910 PM EDT SUN AUG 21 2011

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

0759 PM     TSTM WND DMG     3 E NORCROSS            33.94N 84.16W
08/21/2011                   GWINNETT           GA   911 CALL CENTER

            2 TREES DOWN ACROSS THE ROADWAY.

&&

AGIBBS

Special weather statement, Aug 21, 9:29 PM EDT, 1 hour 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
929 PM EDT SUN AUG 21 2011

GAZ027-038-220200-
929 PM EDT SUN AUG 21 2011

...SIGNIFICANT WEATHER ADVISORY FOR 40 MPH WINDS IN OGLETHORPE AND
MADISON COUNTIES UNTIL 1000 PM EDT...

AT 928 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER PAOLI...MOVING EAST AT 20 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE PEA SIZED HAIL...FREQUENT
CLOUD TO GROUND LIGHTNING AND WIND GUSTS TO 40 MPH AS IT MOVES ACROSS
OGLETHORPE AND MADISON COUNTIES THROUGH 1000 PM EDT. SOME LOCATIONS
IN THE PATH OF THIS STORM INCLUDE PAOLI...COMER...WATSON MILL BRIDGE
STATE PARK AND CARLTON. BRIEF HEAVY DOWNPOURS WILL CAUSE PONDING OF
WATER ON ROADWAYS.

&&

LAT...LON 3395 8279 3406 8323 3423 8319 3422 8308
      3417 8309 3415 8305 3406 8299 3401 8293
      3402 8291 3399 8286 3400 8283 3398 8278
      3396 8278
TIME...MOT...LOC 0130Z 282DEG 19KT 3413 8310

Special weather statement, Aug 21, 10:04 PM EDT, 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1004 PM EDT SUN AUG 21 2011

GAZ027-038-039-220245-
1004 PM EDT SUN AUG 21 2011

...SIGNIFICANT WEATHER ADVISORY FOR 40 MPH WINDS IN WILKES...
OGLETHORPE AND MADISON COUNTIES UNTIL 1045 PM EDT...

AT 957 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER PAOLI...MOVING SOUTHEAST AT 15 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE PEA SIZED HAIL...FREQUENT
CLOUD TO GROUND LIGHTNING AND WIND GUSTS TO 40 MPH AS IT MOVES ACROSS
WILKES...OGLETHORPE AND MADISON COUNTIES THROUGH 1045 PM EDT. SOME
LOCATIONS IN THE PATH OF THIS STORM INCLUDE PAOLI...CARLTON...POINT
PETER...JACKSONS CROSSROADS...MALLORYSVILLE...NORMAN AND VESTA. BRIEF
HEAVY DOWNPOURS WILL CAUSE PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 3412 8322 3425 8310 3423 8307 3417 8309
      3401 8293 3402 8291 3399 8286 3400 8283
      3398 8279 3399 8266 3398 8264 3388 8260
      3387 8256 3382 8259 3368 8251
TIME...MOT...LOC 0204Z 308DEG 13KT 3414 8307

Special weather statement, Aug 21, 10:45 PM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1045 PM EDT SUN AUG 21 2011

GAZ039-220315-
1045 PM EDT SUN AUG 21 2011

...SIGNIFICANT WEATHER ADVISORY FOR FREQUENT LIGHTNING IN WILKES
COUNTY UNTIL 1115 PM EDT...

AT 1039 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER DELHI...MOVING SOUTHEAST AT 20 MPH.

THIS STORM HAS THE POTENTIAL TO PRODUCE 35 MPH WINDS. IN
ADDITION...LIGHTNING DETECTION SYSTEMS INDICATE NUMEROUS
CLOUD-TO-GROUND LIGHTNING STRIKES ACROSS WILKES COUNTY...INCLUDING
AREAS AROUND DELHI...TIGNALL...DANBURG...FLORAL HILL...METASVILLE
AND HOLLIDAY PARK. RESIDENTS IN THIS AREA SHOULD STAY INDOORS.
ELECTRICAL APPLIANCES AND TELEPHONES SHOULD NOT BE USED UNLESS IN AN
EMERGENCY.

&&

LAT...LON 3364 8253 3379 8279 3399 8273 3399 8267
      3398 8264 3388 8260 3387 8256 3382 8259
      3366 8249 3365 8249
TIME...MOT...LOC 0244Z 294DEG 18KT 3389 8264

The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 21, 8:08 PM EDT	Special Weather Statement	FFC	Walton	52 min
Aug 21, 8:28 PM EDT	Special Weather Statement	FFC	Gwinnett	32 min
Aug 21, 8:34 PM EDT	Special Weather Statement	FFC	Barrow	26 min
Aug 21, 8:54 PM EDT	Special Weather Statement	FFC	Meriwether	36 min
Aug 21, 9:11 PM EDT	Severe Thunderstorm Warning	FFC	Meriwether, Pike	49 min
Aug 21, 9:29 PM EDT	Special Weather Statement	FFC	Madison	31 min
Aug 21, 10:04 PM EDT	Special Weather Statement	FFC	Madison	41 min
Aug 21, 10:58 PM EDT	Special Weather Statement	FFC	Morgan	32 min
Aug 21, 11:12 PM EDT	Special Weather Statement	FFC	Lamar, Pike	48 min
Aug 21, 11:14 PM EDT	Special Weather Statement	FFC	Wilkes	46 min
Aug 22, 12:00 AM EDT	Special Weather Statement	FFC	Wilkes	45 min
Aug 22, 12:05 AM EDT	Special Weather Statement	FFC	Greene	40 min
Aug 22, 12:37 AM EDT	Special Weather Statement	FFC	Glascock, Hancock, Warren	38 min
Aug 22, 1:01 AM EDT	Special Weather Statement	FFC	Hancock	29 min
Aug 22, 5:39 PM EDT	Special Weather Statement	FFC	Telfair	36 min
Aug 22, 5:55 PM EDT	Special Weather Statement	FFC	Crisp	35 min
Aug 22, 6:06 PM EDT	Special Weather Statement	FFC	Wheeler	39 min
Aug 22, 7:07 PM EDT	Special Weather Statement	FFC	Dodge, Telfair, Wheeler	38 min
Aug 22, 7:50 PM EDT	Special Weather Statement	FFC	Montgomery, Treutlen	40 min

Nearby

Special Weather Statements in Georgia, 2011 Every special weather statement 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.