Alert archive / Georgia / Special Weather Statements in 2013

Special Weather Statement, NWS Atlanta, GA

August 21, 2013DeKalb County, Georgia

NWS Atlanta, GA issued this special weather statement at Aug 21, 2013, 11:17 AM EDT for DeKalb County, Georgia. It was in force for 58 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, 2013, 11:17 AM EDT (15:17 UTC)
Expired: Aug 21, 2013, 12:15 PM EDT
In force: 58 min
Issued by: NWS Atlanta, GA

County DeKalb County, GA

The radar

The Atlanta radar (KFFC), 63 km from the middle of the area, began a volume at 15:18 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, 3.3 hours before the alert went out and 59 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: 873 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 589 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 118 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 Aug 21, 7:50 AM EDT, 3 hours 27 minutes earlier.

Area forecast discussion, Aug 21, 7:50 AM EDT, 3 hours 27 minutes before

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Hazardous weather outlook, Aug 21, 6:24 AM EDT, 4 hours 53 minutes before

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In the hours before

Special weather statement, Aug 21, 9:26 AM EDT, 1 hour 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
926 AM EDT WED AUG 21 2013

GAZ045-046-211430-
926 AM EDT WED AUG 21 2013

...SIGNIFICANT WEATHER ADVISORY FOR HEAVY RAIN IN ROCKDALE AND
EASTERN DEKALB COUNTIES UNTIL 1030 AM EDT...

AT 925 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SHOWERS AND THUNDERSTORMS WITH HEAVY RAIN FALLING OVER ROCKDALE AND
EASTERN DEKALB COUNTIES.

RAINFALL AMOUNTS OF 1 TO 1.5 INCHES HAVE ALREADY FALLEN IN THE LAST
HOUR AND AN ADDITIONAL INCH OR SO CAN BE EXPECTED THROUGH 1030 AM.
HEAVY RAIN AND MINOR URBAN FLOODING MAY OCCUR IN AREAS AROUND
KLONDIKE...PANOLA MOUNTAIN STATE PARK...RICHARDSON PARK...
MAGNET...LAKEVIEW ESTATES...CONYERS...ARABIA MOUNTAIN...
REDAN...LITHONIA...MILSTEAD AND GEORGIA INTERNATIONAL HORSE PARK.
DRIVERS SHOULD USE CAUTION AS INTENSE RAINFALL WILL REDUCE
VISIBILITIES AND INCREASE THE CHANCE OF HYDROPLANING. ALLOW EXTRA
TIME TO REACH YOUR DESTINATION.

&&

LAT...LON 3380 8410 3376 8403 3376 8401 3371 8392
      3366 8393 3353 8404 3357 8411 3356 8413
      3364 8418 3365 8421
TIME...MOT...LOC 1323Z 225DEG 9KT 3368 8400

Special weather statement, Aug 21, 10:06 AM EDT, 1 hour 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1006 AM EDT WED AUG 21 2013

GAZ045-046-211500-
1006 AM EDT WED AUG 21 2013

...SIGNIFICANT WEATHER ADVISORY FOR HEAVY RAIN AND MINOR FLOODING IN
ROCKDALE AND SOUTHEASTERN DEKALB COUNTIES UNTIL 1100 AM EDT...

AT 1004 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUING TO FALL
OVER ROCKDALE AND EASTERN DEKALB COUNTIES. RAINFALL AMOUNTS OF 2 TO
3 INCHES HAVE ALREADY FALLEN IN THE LAST TWO HOURS. THE RAIN SHOULD
MOVE OUT OF ROCKDALE COUNTIES IN THE NEXT HOUR BUT NOT BEFORE AN
ADDITIONAL ONE HALF TO ONE INCH ACCUMULATES.

RUNOFF FROM THESE STORMS WILL CAUSE MINOR FLOODING OF SMALL CREEKS
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES ACROSS
ROCKDALE AND DEKALB COUNTIES...INCLUDING AREAS AROUND CONYERS...
ARABIA MOUNTAIN...BELMONT...PANTHERSVILLE...LITHONIA...REDAN...PINE
LAKE...MILSTEAD...LAKEVIEW ESTATES...STONE MOUNTAIN AND BIG HAYNES
CREEK PARK. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE
BANKS OF CREEKS AND STREAMS ARE SUBJECT TO MINOR FLOODING.

&&

LAT...LON 3384 8416 3375 8403 3378 8399 3375 8393
      3364 8402 3365 8409 3369 8418 3368 8426
      3369 8430
TIME...MOT...LOC 1403Z 214DEG 6KT 3368 8405

Special weather statement, Aug 21, 11:17 AM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
1117 AM EDT WED AUG 21 2013

GAZ045-211615-
1117 AM EDT WED AUG 21 2013

...SIGNIFICANT WEATHER ADVISORY FOR HEAVY RAIN AND MINOR FLOODING IN
DEKALB COUNTY UNTIL 1215 PM EDT...

AT 1115 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUING TO FALL
OVER DEKALB COUNTY. ONE TO TWO INCHES OF RAIN HAS ALREADY FALLEN IN
THE LAST TWO HOURS AND AN ADDITIONAL 0.5 TO 1.5 INCH OF RAIN IS
EXPECTED THROUGH 1215 PM BEFORE IT MOVES TAPERS OFF.

RUNOFF FROM THESE STORMS WILL CAUSE MINOR FLOODING OF SMALL CREEKS
AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES ACROSS
DEKALB COUNTY...INCLUDING AREAS AROUND PINE LAKE...STONE MOUNTAIN AND
TUCKER. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF
CREEKS AND STREAMS ARE SUBJECT TO MINOR FLOODING. SLOW DOWN AND
ALLOW EXTRA TIME TO REACH YOUR DESTINATION. DO NOT DRIVE INTO
FLOODED AREAS.

&&

LAT...LON 3391 8425 3390 8423 3387 8420 3386 8416
      3380 8410 3376 8414 3377 8425 3382 8434
TIME...MOT...LOC 1514Z 214DEG 6KT 3378 8397

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 8:13 PM EDT	Special Weather Statement	FFC	Chattahoochee, Macon, Marion, Muscogee, Schley, Talbot and 1 more	47 min
Aug 20, 8:24 PM EDT	Special Weather Statement	FFC	Crisp	36 min
Aug 20, 8:39 PM EDT	Severe Thunderstorm Warning	FFC	Crisp, Wilcox	51 min
Aug 20, 8:55 PM EDT	Severe Thunderstorm Warning	FFC	Dooly, Pulaski, Wilcox	50 min
Aug 20, 9:00 PM EDT	Special Weather Statement	FFC	Macon, Talbot, Taylor	30 min
Aug 20, 9:33 PM EDT	Flash Flood Warning	FFC	Crisp, Dooly, Wilcox	6 hr
Aug 20, 9:52 PM EDT	Special Weather Statement	FFC	Crawford, Houston, Peach, Upson	53 min
Aug 20, 11:03 PM EDT	Special Weather Statement	FFC	Dodge	42 min
Aug 20, 11:37 PM EDT	Special Weather Statement	FFC	Laurens, Wheeler	38 min
Aug 20, 11:51 PM EDT	Special Weather Statement	FFC	Newton, Rockdale	24 min
Aug 21, 12:20 AM EDT	Special Weather Statement	FFC	Laurens	40 min
Aug 21, 4:07 AM EDT	Flash Flood Watch	FFC	Baldwin, Bibb, Bleckley, Chattahoochee, Crawford, Crisp and 29 more	17 hr
Aug 21, 9:26 AM EDT	Special Weather Statement	FFC	Rockdale	64 min
Aug 21, 10:06 AM EDT	Special Weather Statement	FFC	Rockdale	54 min
Aug 21, 11:51 AM EDT	Flash Flood Warning	FFC	DeKalb	6 hr
Aug 21, 12:10 PM EDT	Flash Flood Warning	FFC	White	6 hr
Aug 21, 1:24 PM EDT	Special Weather Statement	FFC	Polk	36 min
Aug 21, 3:47 PM EDT	Special Weather Statement	FFC	Telfair, Wheeler	28 min
Aug 21, 4:42 PM EDT	Special Weather Statement	FFC	Chattooga, Dade, Walker	33 min
Aug 21, 4:57 PM EDT	Severe Thunderstorm Warning	FFC	Oglethorpe, Wilkes	48 min
Aug 21, 5:58 PM EDT	Special Weather Statement	FFC	Polk	32 min
Aug 21, 6:22 PM EDT	Special Weather Statement	FFC	Haralson	38 min
Aug 21, 6:58 PM EDT	Special Weather Statement	FFC	Monroe	32 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.