Alert archive / Georgia / Special Weather Statements in 2013

Special Weather Statement, NWS Atlanta, GA

August 1, 2013Dawson County, Georgia

NWS Atlanta, GA issued this special weather statement at Aug 1, 2013, 12:58 AM EDT for Dawson County, Georgia. It was in force for 32 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 1, 2013, 12:58 AM EDT (04:58 UTC)
Expired: Aug 1, 2013, 1:30 AM EDT
In force: 32 min
Issued by: NWS Atlanta, GA

County Dawson County, GA

The radar

The Atlanta radar (KFFC), 117 km from the middle of the area, began a volume at 05:00 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, 5.0 hours before the alert went out and 115 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: 557 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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 Jul 31, 9:00 PM EDT, 3 hours 58 minutes earlier.

Area forecast discussion, Jul 31, 9:00 PM EDT, 3 hours 58 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
900 PM EDT WED JUL 31 2013

.UPDATE...
MID LEVEL WAVE SEEMS TO BE DRIVING THE CONVECTION OVER EASTERN AL.
THE MOST UNSTABLE PORTION OF THE AIRMASS IS ALONG THE GA/AL
BORDER FROM ABOUT CARROLL COUNTY N. THE FEELING IS ANY
THUNDERSTORMS WILL WEAKEN AS THEY MOVE EAST. BDL

&&

.PREV DISCUSSION... /ISSUED 710 PM EDT WED JUL 31 2013/

SHORT TERM /TONIGHT THROUGH THURSDAY NIGHT/...
INITIAL...MAIN...SHORT WAVE IS TRAVERSING THE REGION THIS
AFTERNOON AND WILL BE EAST OF THE FORECAST AREA BY LATE THIS
EVENING. SATELLITE TRENDS SHOW THE CONVECTION THAT HAS BEEN FIRING
UPSTREAM IN THE NORTHWEST UPPER FLOW HAS NOT BEEN VERY ACTIVE.
HOWEVER THE POTENTIAL FOR WEAK WAVES INHERENT IN THIS TYPE OF
REGIME INDICATES DECENT POPS ARE IN ORDER FOR TONIGHT...ALTHOUGH I
WILL BE LETTING THEM DIMINISH FROM LIKELY TO HIGH CHANCE THROUGH
THE EVENING. WEAK SURFACE BOUNDARY AND DRIER AIRMASS MOVES INTO
THE AREA FROM NORTHWEST TO SOUTHEAST TOMORROW WITH DIMINISHING
RAIN CHANCES. APPEARS DRY AIR INFILTRATES FAR ENOUGH SOUTH TO SHUT
OFF ALL POPS FOR THE FORECAST AREA BY LATE THURSDAY.

RAIN-COOLED ATMOSPHERE SEEMS TO HAVE LIMITED INSTABILITY ENOUGH
ACROSS THE AREA TO KEEP CONVECTION BELOW SEVERE LIMITS...AND I
EXPECT THIS TREND WILL CONTINUE. AS ALWAYS WITH A NORTHWEST FLOW
SET-UP...WE WILL NEED TO KEEP A CLOSE WATCH UPSTREAM FOR ANY
INCREASE IN INTENSITY OR COVERAGE. ALTHOUGH PRECIPITABLE WATER
VALUES ARE WELL ABOVE SEASONAL NORMALS...STEADY MOVEMENT OF THE
HEAVIER PRECIPITATION SHOULD KEEP WIDESPREAD FLOODING POTENTIAL TO
A MINIMUM.

20

LONG TERM /FRIDAY THROUGH WEDNESDAY/...
THE FLOW SORT OF FLATTENS OUT AT THE BEGINNING OF THE PERIOD AS
RIDGING OVER THE SOUTHERN PLAINS PUSHES EAST. THIS WILL LEAD TO AT
LEAST A BRIEF DRYING TREND ACROSS THE AREA FRIDAY INTO SATURDAY.
WILL SEE A SLIGHT INCREASE IN TEMPS BUT GENERALLY STILL REMAINING
NORMAL TO JUST BELOW. ANOTHER SHORTWAVE DIGS DOWN THE FLOW
INCREASING THE AMPLITUDE OF THE OVERALL WAVE TRAIN LATE ON
SATURDAY...PUTTING US FIRMLY INTO NORTHWEST FLOW ALOFT AGAIN ON
SUNDAY. ECMWF IS QUITE A BIT WETTER THAN GFS INTO THE BEGINNING OF
NEXT WEEK BUT OVERALL A GENERALLY UNSETTLED WEATHER PATTERN
REMAINS IN PLACE THROUGH NEXT WEEK. MADE ONLY MINOR CHANGES TO THE
EXTENDED...MAINLY TO REFRESH DATA FOR PERIOD 4 AND TO INCREASE
POPS JUST A TAD FOR THE BEGINNING OF THE WORK WEEK.

TDP

PREV DISCUSSION... /ISSUED 431 AM EDT WED JUL 31 2013/
AT THE BEGINNING OF THE PERIOD A WEAK FRONTAL BOUNDARY WILL BE
MOVING INTO CENTRAL GEORGIA.  CONVECTION ASSOCIATED WITH THIS
BOUNDARY MAY BE ONGOING.  EXPECT THIS CONVECTION TO BE ON A GENERAL
WEAKENING TREND THROUGH THE EVENING.  AT THIS POINT FRIDAY LOOKS TO
BE THE BEST DAY FOR NO POPS ACROSS THE REGION AS WE WAIT FOR
NORTHWEST FLOW TO BRING US ANOTHER IMPULSE AND RAIN TO THE AREA.
MOISTURE ASSOCIATED WITH DORIAN SHOULD HELP IN INCREASE PWATS AND
RAIN CHANCES THIS WEEKEND AND INTO NEXT WEEK. THE MODELS SUGGEST
THAT WE KEEP NORTHWEST FLOW THROUGH AT LEAST MID NEXT WEEK...WHEN
THEY TRY TO BUILD A RIDGE INTO THE SOUTHERN UNITED STATES.  MAY
CONCERN IN THE EXTENDED COULD BE RAINFALL ASSOCIATED WITH THE
SHOWERS AND THUNDERSTORMS THIS WEEKEND AND INTO EARLY NEXT WEEK.
THIS WILL NEED TO BE MONITORED CLOSELY FOR POSSIBLE FLOODING AS WE
APPROACH THIS WEEKEND.

ARG

AVIATION...
00Z UPDATE...
CONCERN FOR THUNDERSTORMS TO DEVELOP OVER THE FORECAST AREA TONIGHT
WITH LOW CONFIDENCE FOR IMPACTS TO THE TAF SITES. OTHERWISE A MIX
OF MVFR TO HIGH VFR CEILINGS TRENDING TO IFR CEILINGS LATE TONIGHT
WITH MVFR AND POSSIBLY IFR VSBYS. SURFACE WINDS SSE-SW 5 KTS OR
LESS OR CALM.

//ATL CONFIDENCE...00Z UPDATE...
LOW CONFIDENCE FOR THUNDERSTORM IMPACTS OVERNIGHT.
MEDIUM CONFIDENCE OTHER ELEMENTS.

BDL

&&

.PRELIMINARY POINT TEMPS/POPS...
ATHENS          81  70  88  69 /  80  50  40  10
ATLANTA         77  71  87  70 /  80  50  40  10
BLAIRSVILLE     78  66  83  63 /  90  50  30  10
CARTERSVILLE    79  69  87  66 /  90  60  40  10
COLUMBUS        78  73  89  72 /  80  50  50  20
GAINESVILLE     80  71  87  70 /  80  50  40  10
MACON           77  73  88  71 / 100  50  50  20
ROME            78  69  87  67 /  90  60  30  10
PEACHTREE CITY  79  70  87  67 /  90  50  40  10
VIDALIA         86  72  88  72 /  80  50  60  20

&&

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

SHORT TERM...BDL
LONG TERM....39
AVIATION...BDL

Hazardous weather outlook, Jul 31, 6:20 PM EDT, 6 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
620 PM EDT WED JUL 31 2013

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-011100-
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-
620 PM EDT WED JUL 31 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH AND CENTRAL
GEORGIA.

.DAY ONE...REST OF TONIGHT...

ISOLATED THUNDERSTORMS REMAIN POSSIBLE OVERNIGHT.

WEATHER HAZARDS EXPECTED...

BRIEF WIND GUSTS TO 40 MPH... OCCASIONAL LIGHTNING AND LOCALIZED
HEAVY RAIN.

DISCUSSION...

A SERIES OF UPPER DISTURBANCES WILL INTERACT WITH MODERATE
INSTABILITY AND AMPLE LOW LEVEL MOISTURE TO PRODUCE SCATTERED
SHOWERS... AND POSSIBLY A FEW THUNDERSTORMS THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

THUNDERSTORMS POSSIBLE EACH DAY ACROSS THE AREA.

DISCUSSION...

ACTIVE WEATHER PATTERN SHOULD LEAD TO THUNDERSTORMS EACH DAY WITH
FRIDAY HAVING THE LOWEST CHANCE. WITH THE ACTIVE WEATHER PATTERN
FLOODING COULD RETURN AS A CONCERN TO THE AREA AS WELL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT REQUESTED BUT SPOTTERS ARE ENCOURAGED
TO SUBMIT REPORTS OF SEVERE WEATHER THROUGH THE WEB BY GOING TO
WEATHER.GOV/ATLANTA.

In the hours before

Special weather statement, Jul 31, 9:09 PM EDT, 3 hours 49 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
909 PM EDT WED JUL 31 2013

GAZ019-030-041-010200-
909 PM EDT WED JUL 31 2013

...SIGNIFICANT WEATHER ADVISORY FOR HEAVY RAIN AND 40 MPH WIND GUSTS
IN POLK...FLOYD AND HARALSON COUNTIES UNTIL 1000 PM EDT...

AT 908 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR ETNA...AND MOVING EAST AT 15 MPH.

WIND GUSTS OF 40 MPH...BRIEF HEAVY RAIN AND OCCASIONAL CLOUD TO
GROUND LIGHTNING ARE LIKELY AS THIS STORM MOVES ACROSS POLK...SOUTH
FLOYD AND NORTH HARALSON COUNTIES THROUGH 1000 PM EDT. SOME
LOCATIONS IN THE PATH OF THE STORM INCLUDE ESOM HILL...ETNA...CAVE
SPRING...FELTON...CEDARTOWN...ANTIOCH...EUBANK LAKE... DRAKETOWN...
SENEY...FISH CREEK...VAN WERT...ROCKMART...ARAGON AND LINDALE.

&&

LAT...LON 3437 8501 3432 8503 3422 8503 3421 8505
      3409 8504 3408 8501 3395 8502 3395 8505
      3391 8505 3390 8503 3382 8504 3383 8538
      3412 8543
TIME...MOT...LOC 0108Z 259DEG 14KT 3399 8539

Special weather statement, Jul 31, 10:18 PM EDT, 2 hours 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1018 PM EDT WED JUL 31 2013

GAZ011-019-010300-
1018 PM EDT WED JUL 31 2013

...SIGNIFICANT WEATHER ADVISORY FOR FREQUENT LIGHTNING AND HEAVY
RAIN IN CHATTOOGA AND FLOYD COUNTIES UNTIL 1100 PM EDT...

AT 1015 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF STRONG THUNDERSTORMS NEAR CHATTOOGAVILLE AND MENLO...AND
MOVING EAST AT 20 MPH.

THESE STORMS HAVE THE POTENTIAL TO PRODUCE FREQUENT CLOUD TO GROUND
LIGHTNING... WIND GUSTS TO 40 MPH AND VERY HEAVY RAIN AS THEY MOVE
ACROSS SOUTH CHATTOOGA AND NORTH FLOYD COUNTIES THROUGH 1100 PM EDT.
SOME LOCATIONS IN THE PATH OF THESE STORMS INCLUDE CHATTOOGAVILLE...
MENLO... LYERLY... HOLLAND... BERRYTON... TIDINGS AND ARMUCHEE.
HEAVY DOWNPOURS WILL CAUSE PONDING OF WATER ON ROADWAYS.

&&

LAT...LON 3459 8507 3455 8506 3454 8509 3447 8509
      3446 8511 3443 8509 3442 8511 3440 8509
      3440 8503 3439 8501 3416 8504 3415 8505
      3416 8544 3459 8553
TIME...MOT...LOC 0213Z 268DEG 18KT 3444 8561 3436 8558
          3428 8565

Special weather statement, Aug 1, 12:58 AM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1258 AM EDT THU AUG 1 2013

GAZ007-013-014-021-022-010530-
1258 AM EDT THU AUG 1 2013

...SIGNIFICANT WEATHER ADVISORY FOR HEAVY RAIN IN PICKENS...
CHEROKEE...DAWSON...FORSYTH AND GILMER COUNTIES UNTIL 130 AM EDT...

AT 1251 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF SHOWERS AND THUNDERSTORMS PRODUCING LOCALLY HEAVY
RAINFALL ALONG AND EAST OF A LINE FROM AMICALOLA FALLS STATE PARK TO
HOLLIS LATHEM RESERVOIR TO HOLBROOK. THIS LINE OF STORMS IS MOVING
EAST VERY SLOWLY AROUND 15 MPH.

RUNOFF FROM THESE STORMS WILL CAUSE MINOR FLOODING OF SMALL CREEKS
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES ACROSS
PICKENS...CHEROKEE...DAWSON...FORSYTH AND GILMER COUNTIES...INCLUDING
AREAS AROUND HIGHTOWER...DUCKTOWN...FREE HOME...REAVIS MOUNTAIN...
HOLLIS LATHEM RESERVOIR...HOLBROOK...LATHEMTOWN...DREW AND MATT.
ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS
AND STREAMS ARE SUBJECT TO MINOR FLOODING.

&&

LAT...LON 3463 8419 3454 8419 3450 8415 3413 8414
      3415 8426 3419 8426 3419 8433 3418 8435
      3464 8434
TIME...MOT...LOC 0455Z 279DEG 12KT 3419 8422

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 9:09 PM EDT	Special Weather Statement	FFC	Polk	51 min
Jul 31, 10:18 PM EDT	Special Weather Statement	FFC	Chattooga, Floyd	42 min
Aug 1, 1:54 AM EDT	Flash Flood Warning	FFC	Cherokee, Dawson, Forsyth, Pickens	6 hr
Aug 1, 6:07 AM EDT	Flash Flood Warning	FFC	Gilmer	6 hr
Aug 1, 7:31 AM EDT	River Flood Warning	FFC	Forsyth	14 hr
Aug 1, 7:44 AM EDT	Areal Flood Warning	FFC	Pickens	6 hr
Aug 1, 9:53 AM EDT	River Flood Warning	FFC	Forsyth, Fulton	37 hr
Aug 1, 12:00 PM EDT	Areal Flood Warning	FFC	Gilmer	6 hr
Aug 1, 6:36 PM EDT	Special Weather Statement	FFC	Wilcox	24 min
Aug 1, 6:59 PM EDT	Special Weather Statement	FFC	Crisp	31 min
Aug 1, 7:35 PM EDT	Special Weather Statement	FFC	Madison	25 min

Nearby

Special Weather Statements in Georgia, 2013 Every special weather statement in 2013

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.