U.S. Weather Extremes for
Friday, August 17, 2018

High Temperature

109°F at Needles Airport, CA
109°F at Thermal, CA

Low Temperature

36°F at Leadville, CO

High Precipitation

3.46in at Watertown (awos), WI

Data for lower 48 states and courtesy of

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NWS Area Forecast Discussion
AFD issued by the Atlanta/Peachtree City, GA NWS forecast office.

FXUS62 KFFC 181832

Area Forecast Discussion
National Weather Service Peachtree City GA
232 PM EDT Sat Aug 18 2018

.SHORT TERM /Tonight through Sunday Night/...
Scattered to widespread showers and thunderstorms will continue to
develop across the area today as an upper trough axis shifts across
the area. Continued southwest surface flow has kept a moist airmass
in place with PWs remaining near or above two inches for much of the
CWA. Given these elevated PWs, showers and thunderstorms will be
efficient rainfall producers, and locally heavy rainfall can be
expected. While coverage will decrease overnight, at least isolated
activity can be expected to linger.

While the upper trough axis will depart eastward on Sunday, deep
southwest flow will continue at the surface and aloft. Though some
slightly drier air may nose into far north Georgia Sunday (PWs
around 1.5"), PWs will remain at or above two inches elsewhere.
Scattered to widespread showers and thunderstorms will thus again
develop by Sunday afternoon. As has been the case, a few
thunderstorms could become strong with locally gusty winds and
frequent lightning. Highs will remain largely in the 80s given
widespread cloud cover and afternoon convection.


.LONG TERM /Monday through Saturday/...
No major changes needed to the extended portion of the forecast at
this time.

Moist flow off of the Gulf of Mexico will continue ahead of an
approaching frontal boundary on Monday. The front should begin to
cross the Mississippi River late Monday into early Tuesday. By mid-
Tuesday, the front should be crossing the CWFA. This front should
continue to slowly push south through the remainder of Tuesday into
Wednesday and stall out across southern GA for the remainder of the
week into the weekend. Drier air will settle over the area behind
this front.



.AVIATION... 18Z Update... While patches of MVFR ceilings
linger, most ceilings have lifted into the VFR range this
afternoon with this general trend expected into the evening.
Scattered to numerous showers and thunderstorms will continue to
develop this afternoon and evening with coverage becoming more
isolated overnight. IFR ceilings are again expected by early
Sunday morning. Coverage of showers and thunderstorms will
increase by Sunday afternoon. Winds will remain from the SW
through the period 5-10kts.

//ATL Confidence...18Z Update...
High confidence on all elements.



Athens          71  86  71  87 /  60  50  30  60
Atlanta         72  86  72  86 /  60  60  40  60
Blairsville     66  82  66  81 /  60  50  40  60
Cartersville    71  86  71  86 /  60  60  40  60
Columbus        73  87  73  89 /  50  60  30  50
Gainesville     70  84  71  84 /  60  50  40  60
Macon           72  87  72  89 /  50  60  30  40
Rome            71  86  71  86 /  50  50  40  60
Peachtree City  71  86  71  86 /  60  60  40  60
Vidalia         73  89  73  92 /  40  50  20  20




LONG TERM....NListemaa

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