302 
FXUS63 KFSD 280802
AFDFSD

Area Forecast Discussion
National Weather Service Sioux Falls SD
302 AM CDT Mon Aug 28 2017

.SHORT TERM...(Today and Tonight)
Issued at 301 AM CDT Mon Aug 28 2017

Most of the fog has remained at bay very early this morning, though 
there are a couple of sites reporting slightly reduced visibility at 
this time. In light of that, patchy fog wording remains valid 
through the mid morning hours. Otherwise, it looks like a pleasant 
day in store as surface high pressure settles across the region. 
Winds will be relatively light, transitioning to a southerly 
component over our western zones by afternoon as the surface ridge 
axis slides to the east. With that, temperatures will be a touch 
warmer today over south central SD and The western James River 
Valley, topping out in the mid 80s. Back to the east, readings will 
be reminiscent of late, with highs mid and upper 70s.

For tonight, our area remains under the influence of high pressure. 
In the weak gradient, winds will again become nearly calm. With that 
and clear skies cannot rule out patchy fog development, though 
confidence is not high enough to include in the forecast at this 
time. Lows will generally be lower to mid 50s.

.LONG TERM...(Tuesday through Sunday)
Issued at 301 AM CDT Mon Aug 28 2017

Very little in changes for the upcoming week as models are in in 
fairly good agreement through Friday. Upper level troughiness to the 
northeast and a broad ridge across the central and northern Rockies 
will bring light northwest flow aloft to the area. This will keep 
dry conditions with near normal temperatures. A few mornings may end 
up being a bit cooler, especially in low lying areas, as winds will 
be light at times during the overnight hours. Overall, lows from the 
lower 50s to lower 60s and highs from about 75 to 85. 

By Thursday night a strong jet max will collapse the ridge over the 
Rockies and bring a small chance for rain and thunderstorms. 
Soundings are not real supportive of convection so will keep the 
chances about 20 to 30 percent and west of Interstate 29. Along with 
this threat for thunderstorms will come stronger south winds on 
Friday. 

The models are not quite as agreeable on the weekend with the main 
difference the handling of the upper level jet near the Canadian 
border. Overall the main differences would be temperatures as none 
of the scenarios really supports much in the way of showers and 
thunderstorms.

&&

.AVIATION...(For the 06Z TAFS through 06Z Monday night)
Issued at 1138 PM CDT Sun Aug 27 2017

Mainly VFR conditions expected through the TAF period. The
exception will be some patchy fog development overnight which
could affect the TAF sites.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
IA...None.
NE...None.
&&

$$

SHORT TERM...JM
LONG TERM...08
AVIATION...JM