Alert archive / Georgia / Special Weather Statements in 2013

Special Weather Statement, NWS Atlanta, GA

July 15, 2013DeKalb County, Rockdale County, Georgia

NWS Atlanta, GA issued this special weather statement at Jul 15, 2013, 5:20 PM EDT for DeKalb County, Rockdale County, Georgia. It was in force for 40 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: Jul 15, 2013, 5:20 PM EDT (21:20 UTC)
Expired: Jul 15, 2013, 6:00 PM EDT
In force: 40 min
Issued by: NWS Atlanta, GA

Counties DeKalb County, GA, Rockdale County, GA

The radar

The Atlanta radar (KFFC), 64 km from the middle of the area, began a volume at 21:23 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

Birmingham, AL (KBMX), launched 12:00Z, 9.3 hours before the alert went out and 260 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: 954 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 515 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.4

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 15, 3:46 PM EDT, 1 hour 34 minutes earlier.

Area forecast discussion, Jul 15, 3:46 PM EDT, 1 hour 34 minutes before

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Hazardous weather outlook, Jul 15, 4:33 PM EDT, 47 minutes before

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In the hours before

Special weather statement, Jul 15, 3:15 PM EDT, 2 hours 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
315 PM EDT MON JUL 15 2013

GAZ074-083>085-095>097-151945-
315 PM EDT MON JUL 15 2013

...SIGNIFICANT WEATHER ADVISORY FOR 40 MPH WINDS IN WASHINGTON...
TWIGGS...LAURENS...JOHNSON...WILKINSON...BLECKLEY AND HOUSTON
COUNTIES UNTIL 345 PM EDT...

AT 312 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS FROM SPANN TO COLEY STATION...MOVING NORTHWEST
AT 20 MPH.

THESE STORMS HAVE THE POTENTIAL TO PRODUCE FREQUENT CLOUD TO GROUND
LIGHTNING...HEAVY RAIN AND WIND GUSTS TO 40 MPH AS THEY MOVE ACROSS
WASHINGTON...TWIGGS...LAURENS...JOHNSON...WILKINSON...BLECKLEY AND
HOUSTON COUNTIES THROUGH 345 PM EDT. SOME LOCATIONS IN THE PATH OF
THESE STORMS INCLUDE LOVETT...MONTROSE...DUDLEY...PAULK...
GOLDSBORO...REBIE...ROYAL...PORTER...COLEY STATION...COCHRAN...
SPANN...WRIGHTSVILLE...CARY...DONOVAN AND CHAPPELLS MILL. HEAVY
DOWNPOURS WILL CAUSE PONDING OF WATER ON ROADWAYS.

THE HIGH RAIN TOTALS SEEN THUS FAR THIS SEASON HAS RESULTED IN
PERSISTENT WET SOILS FOR AREA TREES. THIS WILL ALLOW THESE TREES TO
FALL DUE TO WINDS MUCH LOWER THAN IN A TYPICAL SEASON...AS LOW AS 30
MPH IN SOME CASES.

&&

LAT...LON 3264 8254 3256 8299 3233 8341 3253 8367
      3260 8372 3261 8371 3264 8372 3267 8371
      3268 8368 3266 8360 3270 8361 3273 8360
      3285 8339 3293 8292
TIME...MOT...LOC 1914Z 125DEG 18KT 3268 8274 3262 8309
          3244 8342

Special weather statement, Jul 15, 3:44 PM EDT, 1 hour 36 minutes before

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Special weather statement, Jul 15, 4:15 PM EDT, 1 hour 5 minutes before

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Special weather statement, Jul 15, 4:24 PM EDT, 56 minutes before

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Special weather statement, Jul 15, 4:32 PM EDT, 48 minutes before

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Special weather statement, Jul 15, 5:20 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 2:45 PM EDT	Special Weather Statement	FFC	Bleckley	30 min
Jul 15, 3:15 PM EDT	Special Weather Statement	FFC	Bleckley, Johnson, Twiggs, Wilkinson	30 min
Jul 15, 3:25 PM EDT	River Flood Warning	FFC	Montgomery, Treutlen, Wheeler	42 hr
Jul 15, 3:44 PM EDT	Special Weather Statement	FFC	Twiggs, Wilkinson	46 min
Jul 15, 4:15 PM EDT	Special Weather Statement	FFC	Dooly, Macon, Sumter	45 min
Jul 15, 4:24 PM EDT	Special Weather Statement	FFC	Butts, Spalding	51 min
Jul 15, 4:32 PM EDT	Special Weather Statement	FFC	Greene, Taliaferro, Wilkes	43 min
Jul 15, 5:35 PM EDT	Special Weather Statement	FFC	Stewart	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.