Alpharetta, Georgia 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

337
FXUS62 KFFC 290000 AAA
AFDFFC

Area Forecast Discussion...UPDATED
National Weather Service Peachtree City GA
800 PM EDT Sat Jun 28 2025

...New 00Z Aviation Discussion...

.SHORT TERM...
(This evening through Sunday)
Issued at 357 PM EDT Sat Jun 28 2025

Key Messages:

    - Isolated to scattered thunderstorms are possible each
      afternoon and evening through the weekend.

    - Any storm that forms has the potential to produce nuisance
      flooding and localized flash flooding.

    - Slightly more seasonable (but still hot and muggy)
      conditions to continue.

At the surface, what appears to be a remnant MCV from last
night`s persistent, impactful convection churns across southeast
central Georgia. Lift associated with this feature may locally
enhance convective coverage across the southern and western
portion of the forecast area this afternoon, keeping in mind that
any outflow boundaries and the broader forcing from the lingering
mid-level trough will already support thunderstorm development on
their own. Conversely, the slow-to-dissipate cloud deck associated
with the aforementioned MCV will likely delay convective
initiation between Athens and Macon as opposed to locations
further west -- though not substantially, as we`re still under the
influence of a sufficiently warm and moist airmass. This
morning`s 12Z/FFC sounding analyzed cloud layer shear of just 5kts
(and Corfidi upshear and downshear values of 4-5kts), so expect
any storms that form to be very nearly absent of any steering flow
and some may backbuild. WPC has outlooked much of north and
central Georgia within a Marginal (level 1 out of 4) Risk for
Excessive Rainfall as a result, and any thunderstorms that form
today may be capable of producing more than just nuisance
flooding/ponding of roads and poor drainage areas. With surface-
based instability as high as 2000-3000 J/kg, cannot rule out a few
potent upward pulses that may pack a punch on the way down, but
not expecting widespread or organized severe weather.

For Sunday, rinse and repeat. Very little change is expected
throughout the column (mid-level trough is progged to remain
situated across the Southeast with weak flow at the surface), and
if anything the airmass is likely to be even more moist than
today`s (PWAT exceeding 2" in some locations). As such, yet
another day of diurnally-driven convection to round off the
weekend on Sunday, likely to be focused and perhaps very weakly
organized along any remnant outflow boundaries left behind from
this evening`s storms.

Highs today and tomorrow will be in the upper 80s to lower 90s
for all but the terrain of northeast Georgia which will remain in
the mid-70s to mid-80s. Heat index values will be in the 90s to
lower triple digits areawide, so "cooler" than our first bonafide
heatwave midweek, but not cool by any means. Morning lows will be
in the 60s to lower 70s.

96


&&

.LONG TERM...
(Monday morning through next Friday)
Issued at 357 PM EDT Sat Jun 28 2025

Key Messages:

  - Very moist forecast, with diurnally driven convection every
    day. Some decrease in PoPs on the back end of the week, with
    some questions about where a front will be located.

  - Severe not anticipated at this time, but some uncertainty.

Forecast:

Moist air remains locked in across the southeast at the beginning
of the long term forecast on Monday as the upper level low that
has been over the area finally begins to fully fill and break
down. Another upper level low will get pinched off from a TUTT
over the Atlantic thanks to anticyclonic rossby wave breaking over
the CONUS which will then retrograde towards the SE US. There is
still some uncertainty around the overall position of this system
between the different ensemble suites, but the net effect either
way will be to bring increased rainfall chances to the CWA. By
Wednesday into Thursday, a shortwave embedded within the upper
level jet will move across the midwest into the Northeast US and
drive a quick moving front towards GA. Timing differences are
notable in the different ensemble suites likely in part to
different levels of amplification of the short wave, with the Euro
suite a bit slower than the GFS suite. Frontal system looks like
it will move into the CWA by end of next week and briefly stall,
but all ensembles seem to have big signal for broad coastal low to
develop and move across the southeast into the weekend, bringing
yet more moisture and rainfall to the region.

The net effect of all of this is to keep rain chances fairly high
through Wednesday as anomalously high PWATs lock in place across
the area. Highest rain chances look to be Tuesday where moisture
will begin to stream into the area both ahead of the shortwave
developing in the north and as a byproduct of the upper low to the
east. Will need to monitor that upper low, because if it drifts a
bit further to the west over the CWA, even better lift and
increased lapse rates may spread over the area, which would
increase severe chances. Other than that, severe chances are low
at this time. By Wednesday into Thursday, rain chances may be
dictated by the position of the front and whether or not the
surface low in the SE has been able to develop. For now, Thursday
and Friday have relatively lower PoPs, especially across north GA.

Highs will lower through the middle of the week, thanks to
increased moisture, cloud cover, and rain chances, and the
approach of the frontal boundary. Expect upper 80s to mid 80s. By
the end of the week into the weekend, looks like we will rebound
into the 90s. Overnight lows will remain a bit on the warm side,
in the upper 60s to lower 70s, thanks to the copious moisture
keeping Tds elevated across the region.

Lusk


&&

.AVIATION...
(00Z TAFS)
Issued at 737 PM EDT Sat Jun 28 2025

SHRA and TSRA are occurring across much of metro Atlanta. Outflow
from the convection has generated gusts up to ~40 kts. Expecting
that this activity will diminish by 02z. Like the previous couple
of overnights, patchy low-level clouds (IFR/MVFR) and FG/BR will
be possible tonight into early tomorrow (Sunday) morning.
Confidence in this occurring at any one TAF sites is low, however.
A similar weather pattern will remain in place tomorrow, with
isolated/scattered convection in the afternoon/evening and a SCT
Cu field.

//ATL Confidence...00Z Update...
Medium confidence on evolution of convection this evening and
coverage of patchy low-level clouds/FG/BR overnight/early tomorrow
morning. High confidence on all other elements.

Martin


&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          70  92  70  90 /  30  40  20  60
Atlanta         71  90  72  89 /  30  40  20  70
Blairsville     63  86  65  85 /  30  60  30  80
Cartersville    68  90  70  89 /  30  40  20  70
Columbus        71  92  72  91 /  30  60  20  80
Gainesville     70  90  71  89 /  30  50  30  60
Macon           70  91  71  91 /  30  50  20  70
Rome            69  89  70  89 /  20  50  20  70
Peachtree City  68  90  69  90 /  30  40  20  70
Vidalia         72  92  73  91 /  20  60  30  70

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

SHORT TERM...96
LONG TERM....Lusk
AVIATION...Martin