Alert archive / Georgia / Special Weather Statements in 2021

Special Weather Statement, NWS Atlanta, GA

July 12, 20217 counties in Georgia

NWS Atlanta, GA issued this special weather statement at Jul 12, 2021, 8:08 PM EDT for 7 counties in Georgia. It was in force for 37 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 12, 2021, 8:08 PM EDT (00:08 UTC)
Expired: Jul 12, 2021, 8:45 PM EDT
In force: 37 min
Issued by: NWS Atlanta, GA
Hail: 0.25 in
Wind: 40

Counties Barrow County, GA, Clarke County, GA, DeKalb County, GA, Gwinnett County, GA, Madison County, GA, Oconee County, GA, Walton County, GA

The radar

The Atlanta radar (KFFC), 110 km from the middle of the area, began a volume at 00:09 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, 0.1 hours before the alert went out and 105 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: 446 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

357 
WWUS82 KFFC 130008
SPSFFC

Special Weather Statement
National Weather Service Peachtree City GA
808 PM EDT Mon Jul 12 2021
 
GAZ025-027-034>038-045>048-130045-
Madison GA-Jackson GA-Walton GA-Rockdale GA-Barrow GA-DeKalb GA-
Gwinnett GA-Oglethorpe GA-Clarke GA-Oconee GA-Newton GA-
808 PM EDT Mon Jul 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR MADISON...SOUTHERN JACKSON...
WALTON...NORTHEASTERN ROCKDALE...BARROW...DEKALB...GWINNETT...
NORTHWESTERN OGLETHORPE...CLARKE...NORTHERN OCONEE AND NORTHERN
NEWTON COUNTIES UNTIL 845 PM EDT...

At 806 PM EDT...strong thunderstorms extended from near Stone 
Mountain to Walnut Grove and Arnoldsville, moving north at 35 mph.

  HAZARD...Winds up to 40 mph, pea sized hail, frequent lightning 
           and heavy rain.

  IMPACT...Expect minor damage to tree limbs and blowing around of 
           light, unsecured objects. Heavy rain may cause temporary 
           street flooding, especially in poor drainage areas.

Some locations in the path of these storms include
Lawrenceville, Conyers, Winder, Monroe, Jefferson, Watkinsville,
Danielsville, Athens, Duluth, Sugar Hill, Snellville, Suwanee,
Buford, Lilburn, Loganville, Norcross, Clarkston, Braselton, Auburn
and Stone Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3423 8308 3417 8310 3413 8305 3394 8319
      3380 8349 3382 8351 3378 8353 3365 8382
      3371 8428 3400 8422 3399 8420 3403 8417
      3405 8410 3407 8412 3415 8408 3410 8387
      3412 8383 3409 8363 3427 8312
TIME...MOT...LOC 0006Z 200DEG 32KT 3388 8327 3369 8381 3374 8419 

HAIL...0.25IN
WIND...40MPH

$$

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 12, 7:33 PM EDT, 35 minutes earlier.

Area forecast discussion, Jul 12, 7:33 PM EDT, 35 minutes before

Area Forecast Discussion
National Weather Service Peachtree City GA
733 PM EDT Mon Jul 12 2021

...00Z Aviation Forecast Discussion...

.PREV DISCUSSION... /Issued 334 PM EDT Mon Jul 12 2021/

SHORT TERM /Tonight through Tuesday Night/...

As the short term period begins, an upper level low remains stalled
over the Midwest, blocked by the Bermuda High positioned off the mid-
Atlantic coast. Ahead of the upper low, southwesterly flow aloft
remains over the region. Meanwhile, southerly flow has set up at the
low levels on the backside of the Bermuda High. As the high remains
in place and the upper low opens and slowly lifts northeast towards
the Great Lakes overnight and Tuesday, this setup will persist and
allow for the continued advection of moisture from the Gulf of
Mexico over north and central Georgia. Dewpoints will remain in the
low to mid 70s through the period, along with precipitable water
values between 1.7-2.0 inches.

Scattered to numerous showers and thunderstorms are ongoing across
portions of west and north Georgia, primarily in association with a
disturbance traversing the upper level flow. Scattered thunderstorms
are also moving into central Georgia as the sea breeze pushes
further inland. At this time likely PoPs have been maintained for
west and north Georgia and chance PoPs for east and central Georgia.
Considering the high PWAT values, any convection will once again
produce heavy rainfall. In spite of faster boundary layer winds
leading to quicker storm motion, stronger storms training over the
same areas could produce localized flooding concerns. The
abundant atmospheric moisture and warm temperatures are also
contributing to SBCAPE values between 2000-3000 J/kg. With 10-15
kts of low-level wind shear and marginal mid-level lapse rates, an
organized threat for severe weather is not expected. However,
isolated storms may become strong to severe, capable of producing
gusty winds and frequent lightning.

It is possible to see another low stratus deck develop overnight and
persist through the early morning hours on Tuesday, especially in
areas that observe heavy rain this evening. After temperatures warm
and the stratus layer lifts and dissipates, diurnally driven
convection will develop. Scattered showers and thunderstorms are
thus expected across the forecast area once again tomorrow
afternoon. With deep moisture and increased cloud cover, there will
be a smaller diurnal spread of temperatures, with high temperatures
expected to be slightly cooler than average and overnight lows
slightly warmer than average.

King

LONG TERM /Wednesday through Monday/...

To avoid a redundant, monotonous, and repetitive monologue regarding
the long term forecast, the following discussion will be provided
through a series of haikus...

Extended forecast:
It's warm and wet in Georgia,
with no end in sight.

The forecast remains
unchanging, uneventful,
steady everyday.

Insignificant
synoptic influences
planned for the Southeast.

With no real focus,
expect a rinse and repeat
diurnal forecast.

Abundant moisture,
precipitable water
close to two inches.

High temps near ninety,
forty to sixty percent
chance of rain each day.

Scattered thunderstorms
forecast each afternoon with
gusts and heavy rain.

Most storms should be weak,
but isolated severe
cannot be ruled out.

Also possible
is isolated flooding
with persistent rains.

A mid-level ridge
will begin to be displaced
by a trough next week.

How far the trough sinks
is yet to be determined.
Only time will tell.

Thiem

&&

.AVIATION...
00Z Update...
A large area of shra/tsra continues north toward ATL/AHN sites
through 01-02z, diminishing thereafter. Current mainly VFR cigs
will likely lower toward MVFR and IFR after 09-10z, particularly
at ATL/AHN sites. Improvement toward VFR cigs is expected by
16-18z with sct shra/tsra coverage also increasing through the
afternoon. Winds will be largely SW at 4-6kts outside of tsra this
evening before becoming more vrb overnight and light. SW winds
are expected again on Tuesday at 4-8kts.

//ATL Confidence...00Z Update...
Medium confidence on morning cigs wind direction.
High confidence on other elements.

RW

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          69  87  69  89 /  40  60  40  50
Atlanta         70  86  70  88 /  60  60  40  50
Blairsville     64  78  64  82 /  50  70  60  60
Cartersville    69  85  68  88 /  50  60  50  50
Columbus        70  89  70  92 /  50  50  30  50
Gainesville     68  83  68  87 /  50  60  50  50
Macon           70  90  70  92 /  60  50  30  50
Rome            70  86  69  89 /  50  70  50  50
Peachtree City  69  86  68  89 /  60  60  40  50
Vidalia         71  90  71  90 /  40  40  30  50

&&

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

SHORT TERM...King
LONG TERM....Thiem
AVIATION...RW

Hazardous weather outlook, Jul 12, 2:10 PM EDT, 5 hours 58 minutes before

Hazardous Weather Outlook
National Weather Service Peachtree City GA
210 PM EDT Mon Jul 12 2021

GAZ001>009-011>016-019>025-027-030>039-041>062-066>076-078>086-
089>098-102>113-131815-
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-
210 PM EDT Mon Jul 12 2021

This Hazardous Weather Outlook is for portions of North and
Central Georgia.

.DAY ONE...This Afternoon and Tonight...

Scattered thunderstorms capable of producing locally heavy
rainfall are expected this afternoon and evening across north
and central GA. Gusty winds and frequent lightning will also be
possible with any storms.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday...

Scattered to numerous thunderstorms producing locally heavy
rainfall are expected across north and central Georgia through
Sunday, mainly in the afternoon and evening. A few storms may
become strong with gusty winds and frequent lightning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected through tonight.

In the hours before

Special weather statement, Jul 12, 7:33 PM EDT, 35 minutes before

Special Weather Statement
National Weather Service Peachtree City GA
733 PM EDT Mon Jul 12 2021

GAZ085-086-097-098-111>113-130015-
Toombs GA-Wheeler GA-Emanuel GA-Treutlen GA-Johnson GA-Montgomery GA-
Laurens GA-
733 PM EDT Mon Jul 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR TOOMBS...NORTHEASTERN WHEELER...
EMANUEL...TREUTLEN...SOUTHEASTERN JOHNSON...MONTGOMERY AND
SOUTHEASTERN LAURENS COUNTIES UNTIL 815 PM EDT...

At 732 PM EDT...strong thunderstorms extended from near Swainsboro
to Mount Vernon and Uvalde, moving northeast at 30 mph.

  HAZARD...Winds up to 40 mph, pea sized hail, frequent lightning
           and heavy rain.

  IMPACT...Expect minor damage to tree limbs and blowing around of
           light, unsecured objects. Heavy rain may cause temporary
           street flooding, especially in poor drainage areas.

Some locations in the path of these storms include
Swainsboro, Lyons, Soperton, Mount Vernon, Vidalia, Twin City,
Glenwood, Adrian, Uvalda, Stillmore, Oak Park, Ailey, Higgston,
Garfield, Santa Claus, Alston, Nunez, Tarrytown, Kite and Ohoopee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3254 8212 3252 8215 3248 8218 3242 8219
      3235 8225 3219 8219 3198 8224 3200 8259
      3230 8285 3270 8256 3274 8211 3268 8209
TIME...MOT...LOC 2332Z 203DEG 25KT 3246 8244 3203 8255

HAIL...0.25IN
WIND...40MPH

Special weather statement, Jul 12, 7:44 PM EDT, 24 minutes before

Special Weather Statement
National Weather Service Peachtree City GA
744 PM EDT Mon Jul 12 2021

GAZ036>038-045>050-057>060-130030-
Butts GA-Morgan GA-Putnam GA-Walton GA-Rockdale GA-Jasper GA-
Newton GA-Henry GA-DeKalb GA-Oglethorpe GA-Clarke GA-Greene GA-
Oconee GA-
744 PM EDT Mon Jul 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BUTTS...MORGAN...
NORTHWESTERN PUTNAM...SOUTHERN WALTON...ROCKDALE...NORTHERN JASPER...
NEWTON...HENRY...SOUTHEASTERN DEKALB...WESTERN OGLETHORPE...
SOUTHEASTERN CLARKE...NORTHWESTERN GREENE AND OCONEE COUNTIES UNTIL
830 PM EDT...

At 743 PM EDT...strong thunderstorms extended from McDonough to
Mansfield, Madison and Apalachee, moving north at 20 mph.

  HAZARD...Winds up to 40 mph, pea sized hail, frequent lightning
           and heavy rain.

  IMPACT...Expect minor damage to tree limbs and blowing around of
           light, unsecured objects. Heavy rain may cause temporary
           street flooding, especially in poor drainage areas.

Some locations in the path of these storms include
McDonough, Conyers, Covington, Madison, Greensboro, Watkinsville,
Lexington, Stockbridge, Social Circle, Oxford, Lithonia, Porterdale,
Walnut Grove, Winterville, Crawford, Rutledge, Newborn, North High
Shoals, Mansfield and Bostwick.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3341 8335 3332 8382 3339 8421 3373 8425
      3374 8373 3401 8323 3400 8322 3401 8320
      3376 8305
TIME...MOT...LOC 2343Z 185DEG 17KT 3368 8332 3343 8380 3345 8412

HAIL...0.25IN
WIND...40MPH

Local storm report, Jul 12, 7:59 PM EDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
759 PM EDT MON JUL 12 2021

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

0625 PM     TSTM WND DMG     3 WNW WOODBURY          32.99N  84.63W
07/12/2021                   MERIWETHER         GA   911 CALL CENTER

            TREES DOWN

&&

EVENT NUMBER FFC2100437

VSS

Local storm report, Jul 12, 8:02 PM EDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
802 PM EDT MON JUL 12 2021

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

0625 PM     TSTM WND DMG     3 NNW MANCHESTER        32.89N  84.63W
07/12/2021                   MERIWETHER         GA   911 CALL CENTER

            TREES DOWN

&&

EVENT NUMBER FFC2100438

VSS

Local storm report, Jul 12, 8:06 PM EDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
806 PM EDT MON JUL 12 2021

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

0630 PM     TSTM WND DMG     GAY                     33.09N  84.57W
07/12/2021                   MERIWETHER         GA   911 CALL CENTER

            TREE DOWN

&&

EVENT NUMBER FFC2100439

VSS

Special weather statement, Jul 12, 8:08 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Peachtree City GA
808 PM EDT Mon Jul 12 2021

GAZ025-027-034>038-045>048-130045-
Madison GA-Jackson GA-Walton GA-Rockdale GA-Barrow GA-DeKalb GA-
Gwinnett GA-Oglethorpe GA-Clarke GA-Oconee GA-Newton GA-
808 PM EDT Mon Jul 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR MADISON...SOUTHERN JACKSON...
WALTON...NORTHEASTERN ROCKDALE...BARROW...DEKALB...GWINNETT...
NORTHWESTERN OGLETHORPE...CLARKE...NORTHERN OCONEE AND NORTHERN
NEWTON COUNTIES UNTIL 845 PM EDT...

At 806 PM EDT...strong thunderstorms extended from near Stone
Mountain to Walnut Grove and Arnoldsville, moving north at 35 mph.

  HAZARD...Winds up to 40 mph, pea sized hail, frequent lightning
           and heavy rain.

  IMPACT...Expect minor damage to tree limbs and blowing around of
           light, unsecured objects. Heavy rain may cause temporary
           street flooding, especially in poor drainage areas.

Some locations in the path of these storms include
Lawrenceville, Conyers, Winder, Monroe, Jefferson, Watkinsville,
Danielsville, Athens, Duluth, Sugar Hill, Snellville, Suwanee,
Buford, Lilburn, Loganville, Norcross, Clarkston, Braselton, Auburn
and Stone Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3423 8308 3417 8310 3413 8305 3394 8319
      3380 8349 3382 8351 3378 8353 3365 8382
      3371 8428 3400 8422 3399 8420 3403 8417
      3405 8410 3407 8412 3415 8408 3410 8387
      3412 8383 3409 8363 3427 8312
TIME...MOT...LOC 0006Z 200DEG 32KT 3388 8327 3369 8381 3374 8419

HAIL...0.25IN
WIND...40MPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 8:11 PM EDT	Special Weather Statement	FFC	Johnson	49 min
Jul 12, 8:25 PM EDT	Special Weather Statement	FFC	Paulding, Polk	50 min
Jul 12, 8:40 PM EDT	Special Weather Statement	FFC	Montgomery, Toombs	50 min
Jul 12, 8:43 PM EDT	Special Weather Statement	FFC	Clarke, Jackson, Madison, Oglethorpe	47 min
Jul 12, 9:28 PM EDT	Special Weather Statement	FFC	Montgomery, Toombs, Wheeler	47 min
Jul 12, 10:14 PM EDT	Special Weather Statement	FFC	Emanuel, Montgomery, Telfair, Toombs, Treutlen, Wheeler	31 min
Jul 12, 10:59 PM EDT	Special Weather Statement	FFC	Crisp, Dooly, Wilcox	31 min

Nearby

Special Weather Statements in Georgia, 2021 Every special weather statement in 2021

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.