Alert archive / Georgia / Special Weather Statements in 2014

Special Weather Statement, NWS Atlanta, GA

September 6, 2014Harris County, Georgia

NWS Atlanta, GA issued this special weather statement at Sep 6, 2014, 4:13 PM EDT for Harris 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
Sep 6, 2014, 4:13 PM EDT (20:13 UTC)
Expired
Sep 6, 2014, 4:45 PM EDT
In force
32 min
Issued by
NWS Atlanta, GA

County Harris County, GA

The radar

The Atlanta radar (KFFC), 81 km from the middle of the area, began a volume at 20:12 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 12:00Z, 8.2 hours before the alert went out and 85 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, Peachtre/Fal Fld, GA at 12:00Z on 2014-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 805 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2014-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 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
805 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
1022 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-18 m²/s²
0-3 km storm-relative helicity
-8 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.

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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 Sep 6, 2:56 PM EDT, 1 hour 17 minutes earlier.

Area forecast discussion, Sep 6, 2:56 PM EDT, 1 hour 17 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
256 PM EDT SAT SEP 6 2014

.SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...
EXPECT SHOWERS AND THUNDERSTORMS TO INCREASE IN COVERAGE THIS
AFTERNOON...AS TROPICAL AIRMASS REMAINS IN PLACE.

SHORT TERM MODELS IN PRETTY GOOD AGREEMENT WITH OVERALL WEATHER
PATTERN...WITH A FEW DISCREPANCIES NOTED IN TRACK OF THE WEAK UPPER
LEVEL DISTURBANCE AS IT TRACKS ACROSS NORTH FLORIDA OVERNIGHT.  NAM
IS FURTHER NORTH THAN GFS/ECMWF AND THUS WETTER ACROSS CENTRAL
GEORGIA.  MODELS ARE IN BETTER AGREEMENT ON SUNDAY AS THE
DISTURBANCE SLOWLY TRACKS JUST OFF THE SOUTH CAROLINA COAST.  MODELS
ARE IN AGREEMENT BRINGING A WEAK UPPER LEVEL WAVE ACROSS NORTH
GEORGIA BY 06Z TONIGHT...ENHANCING CONVECTION ACROSS NORTH
GEORGIA....THIS IS IN LINE WITH CURRENT RADAR WHICH SHOWS BEST
COVERAGE OVER FAR NORTH AND SOUTH PORTIONS OF FORECAST AREA.  AT THE
SURFACE A WEAK BOUNDARY WILL REMAIN DRAPED ACROSS PORTIONS OF THE
FORECAST AREA THROUGH TOMORROW...WITH ABUNDANT TROPICAL MOISTURE TO
TAP INTO...PRECIPITABLE WATER VALUES WILL REMAIN BETWEEN 1.5 TO 2
INCHES.  THE FOCUS PROVIDED BY THE SURFACE BOUNDARY AND UPPER LEVEL
DISTURBANCES WILL CONTINUE MAINLY DIURNALLY DRIVEN SHOWERS AND
THUNDERSTORMS ACROSS THE AREA...WITH CHANCE POPS LINGERING OVER
CENTRAL GEORGIA THIS EVENING AS SURFACE BOUNDARY SLOWLY SAGS
SOUTHWARD AND ONCE AGAIN ON SUNDAY AFTERNOON. LOCALIZED HEAVY
RAINFALL COULD PRODUCE FLASH FLOODING WITH ANY TRAINING OF
CELLS...AND THERE WILL BE ENOUGH INSTABILITY...MODELS CONTINUE
SHOWING SBCAPES IN THE 1500-2000 J/KG RANGE THIS EVENING AND AGAIN
SUNDAY AFTERNOON...THAT ISOLATED STRONG TO SEVERE STORMS CANNOT BE
RULED OUT WITH HEAVY DOWNPOURS...FREQUENT LIGHTNING AND DAMAGING
WINDS THE MAIN THREATS.

GUIDANCE TEMPERATURES CONTINUE WARMER THAN NORMAL AND ARE PERFORMING
WELL...HAVE GONE WITH A BLEND OF MAV/MET FOR TEMPERATURES.

ATWELL

.LONG TERM /MONDAY THROUGH SATURDAY/...
NO CHANGES TO PREVIOUS FORECAST. SEE PREVIOUS LONG TERM DISCUSSION...

17

LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
REMAINS OF WEAK FRONTAL BOUNDARY OVER CENTRAL GA AND LOW PRESSURE
VICINITY OF THE GA/SC COAST. MODELS WANT TO MOVE THIS LOW SLOWLY
TO THE NORTHEAST. SOMEWHAT DRIER AIR PUSHES INTO THE NORTHWEST
CORNER OF THE STATE. HAVE LOWEST POPS NORTHWEST AND LIKELY ACROSS
EAST CENTRAL INTO THE START OF THE WEEK. AFTER THAT...A BASICALLY
ZONAL FLOW PERSISTS UNTIL THE END OF THE PERIOD. MODELS BRING A
FRONT INTO NORTH GA ON FRIDAY. GFS AND ECMWF DIFFER ON WHEN THE
FRONT WILL MOVE SOUTHWARD INTO THE FORECAST AREA...BUT THIS LOOKS
TO BE BEYOND THIS FORECAST PERIOD. HAVE KEPT A CHANCE OR SLIGHT
CHANCE POPS IN THROUGH FRIDAY.

41

&&

.AVIATION...
18Z UPDATE...
CONVECTION WILL CONTINUE TO INCREASE IN COVERAGE AND INTENSITY
THROUGH THIS EVENING...AIDED BY DAYTIME HEATING. CIGS WILL BE VFR.
DEPENDING UPON WHERE RAINFALL FALLS COULD SEE SOME PATCHY FOG AND
IFR/MVFR VISIBILITIES...CONFIDENCE IN IT DEVELOPING AT ANY TAF
SITE IS TOO LOW TO INCLUDE AT THIS TIME. BEST TIMING FOR
CONVECTION WILL BE 18-00Z THIS AFTERNOON. WINDS ARE LIGHT OUT OF
THE NORTHEAST TO EAST...BUT 5KTS OR LESS. EXPECT ATL COULD SEE NNW
FOR A PERIOD THIS AFTERNOON BEFORE SHIFTING NE THIS EVENING.

//ATL CONFIDENCE...18Z UPDATE...
LOW CONFIDENCE IN WIND DIRECTION AND VISIBILITIES.
MEDIUM TO HIGH CONFIDENCE IN WIND SPEEDS...CIGS...CONVECTION TIMING.

ATWELL

&&

.PRELIMINARY POINT TEMPS/POPS...
ATHENS          69  90  68  85 /  30  50  30  40
ATLANTA         72  87  70  85 /  30  40  30  30
BLAIRSVILLE     64  81  64  82 /  30  50  30  30
CARTERSVILLE    68  87  69  85 /  30  50  30  20
COLUMBUS        72  93  72  89 /  30  40  40  40
GAINESVILLE     69  87  68  84 /  30  50  30  30
MACON           70  93  71  88 /  30  50  40  40
ROME            69  88  68  87 /  30  50  20  20
PEACHTREE CITY  68  89  69  87 /  30  40  30  30
VIDALIA         72  91  72  89 /  50  60  50  60

&&

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

SHORT TERM...ATWELL
LONG TERM....17
AVIATION...ATWELL
Hazardous weather outlook, Sep 6, 4:48 AM EDT, 11 hours 25 minutes before
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In the hours before

Special weather statement, Sep 6, 12:33 PM EDT, 3 hours 40 minutes before
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Special weather statement, Sep 6, 1:49 PM EDT, 2 hours 24 minutes before
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Special weather statement, Sep 6, 2:55 PM EDT, 1 hour 18 minutes before
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Special weather statement, Sep 6, 4:13 PM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 12:33 PM EDTSpecial Weather StatementFFCLumpkin42 min
Sep 6, 1:49 PM EDTSpecial Weather StatementFFCFannin41 min
Sep 6, 2:55 PM EDTSpecial Weather StatementFFCUnion35 min
Sep 6, 4:45 PM EDTSpecial Weather StatementFFCHarris30 min
Sep 6, 5:14 PM EDTSpecial Weather StatementFFCStewart31 min
Sep 6, 5:25 PM EDTSpecial Weather StatementFFCMeriwether35 min
Sep 6, 6:21 PM EDTSpecial Weather StatementFFCMeriwether24 min
Sep 6, 6:38 PM EDTSpecial Weather StatementFFCClayton37 min
Sep 6, 6:45 PM EDTSpecial Weather StatementFFCChattahoochee30 min
Sep 6, 6:47 PM EDTSpecial Weather StatementFFCJackson28 min
Sep 6, 7:02 PM EDTSpecial Weather StatementFFCMeriwether28 min
Sep 6, 7:21 PM EDTSpecial Weather StatementFFCSpalding24 min
Sep 6, 7:42 PM EDTSpecial Weather StatementFFCPike33 min
Sep 6, 7:44 PM EDTSpecial Weather StatementFFCMadison31 min
Sep 6, 7:59 PM EDTSevere Thunderstorm WarningFFCLamar, Monroe, Pike, Spalding30 min

Nearby

Special Weather Statements in Georgia, 2014Every special weather statement in 2014

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.