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Area Forecast Discussion (AFD)

Issued by Peachtree City, GA (FFC)

                            
194 
FXUS62 KFFC 201137
AFDFFC

Area Forecast Discussion
National Weather Service Peachtree City GA
637 AM EST Mon Nov 20 2017



.PREV DISCUSSION... /Issued 324 AM EST Mon Nov 20 2017/ 

SHORT TERM /Today through Tuesday/...

Mid and upper level flow pattern will noticeably amplify during the 
short term forecast period as several strong shortwaves dig into the 
middle US from the Pacific NW and southwestern Canada.

After a cold start /Freeze Warning in effect thru 9am for much of 
the area...see NPWFFC for details/ Monday will be a rather 
pleasant day as weak NW flow in the mid levels takes its time 
shifting to the SW. A broad area of high pressure will rule the 
lower levels. Expect nothing more than some passing cirrus 
clouds...gradually increasing as the day progresses. High temps 
upper 50s north to middle 60s central.

Conditions begin to change Monday night as a strong speed max slides 
down the front range of the Rockies. This shortwave...along with 
another digging vort max across the Upper Great Lakes...will help 
amplify a broad area of cyclonic mid level flow into the Southern US 
and Gulf of Mexico. The lower level response to this will be to push 
the sfc high into the western Atlantic. This will quickly lead to an 
increase in Atlantic moisture to the easterly lower level flow 
regime. This will result in decent WAA advection and a rapid 
increase in low level cloud cover from the south by Tuesday morning. 
This also combined with emerging disturbances within mid level 
cyclonic flow should allow for some sporadic light precip across the 
area on Tuesday. Right now NAM12Bufr soundings /which is preferred 
over the GFS given better lower level resolution/ indicate potential 
for drizzle Tuesday morning before becoming more showers through the 
day. Overall have kept just slight chance over the area given weak 
lift and weak lower level ridge influence.

Kovacik

LONG TERM /Tuesday Night through Sunday/...

The long term period begins with another frontal boundary moving
toward the area from the Tennessee Valley. This looks to be a dry
front with very limited moisture associated with it. Precipitable
water across the northern tier is only around a half an inch so no
pop inclusion for the far NW. Further south there is a slightly
better moisture profile but definitely nothing to write home
about. Southern stream energy is quite strong as it rotates
through the lower Mississippi Valley and warrants slight chance to
low end chance pops despite the limited moisture.

Trough scours moisture south of the area for the remainder of
Wednesday with dry northerly cool advective flow. Another light
freeze will be possible across the far northern tier for early
Thanksgiving morning. An additional strong shortwave moves through
the Tennessee Valley and Mississippi Valley with GFS quicker with
the progression than the ECMWF. Moisture does surge ahead of this
feature as a surface low forms over the Gulf. Looks as though it
will only be the SE corner affected by this activity if at all and
will limit chances to 30 percent.

Deese

&&

.AVIATION...
12Z Update...
VFR conditions expected through today as cirrus gradually increase
from the west. The main concern in terms of ceilings will be
overnight tonight into Tuesday. Low clouds are expected to 
rapidly increase from the south and a quick lowering to MVFR and 
possibly IFR is expected. Patchy drizzle and light showers may 
accompany the low clouds but confidence is not high enough on 
coverage to mention in TAFs yet. NW winds this morning should 
shift to the NE in next hour or so then to the SE this afternoon 
and remain there at under 10kts.

//ATL Confidence...12Z Update...
Medium on ceiling trends/timing into Tuesday morning.
High on all other elements.

Kovacik

&&

.PRELIMINARY POINT TEMPS/POPS...
Athens          59  39  57  44 /   0  20  20  20 
Atlanta         60  44  59  45 /   0  20  20  20 
Blairsville     58  36  56  38 /   0  20  20  10 
Cartersville    59  38  58  41 /   0  10  20  10 
Columbus        63  47  65  49 /   0  10  20  20 
Gainesville     58  39  55  44 /   0  20  20  20 
Macon           63  45  65  47 /   0  10  20  20 
Rome            58  37  60  40 /   0  10  10  10 
Peachtree City  61  38  61  44 /   0  20  20  20 
Vidalia         65  47  68  52 /   0   5  40  40 

&&

.FFC WATCHES/WARNINGS/ADVISORIES...
Freeze Warning until 9 AM EST this morning for the following 
zones: Baldwin...Banks...Barrow...Bartow...Bibb...Butts...
Carroll...Catoosa...Chattooga...Cherokee...Clarke...Clayton...
Cobb...Coweta...Crawford...Dade...Dawson...DeKalb...Douglas...
Fannin...Fayette...Floyd...Forsyth...Gilmer...Glascock...
Gordon...Greene...Gwinnett...Hall...Hancock...Haralson...
Harris...Heard...Henry...Jackson...Jasper...Jefferson...Jones...
Lamar...Lumpkin...Madison...Meriwether...Monroe...Morgan...
Murray...Newton...North Fulton...Oconee...Oglethorpe...
Paulding...Peach...Pickens...Pike...Polk...Putnam...Rockdale...
South Fulton...Spalding...Talbot...Taliaferro...Taylor...Towns...
Troup...Twiggs...Union...Upson...Walker...Walton...Warren...
Washington...White...Whitfield...Wilkes...Wilkinson.

&&

$$

SHORT TERM...Kovacik
LONG TERM....Deese
AVIATION...Kovacik