643 
FXUS63 KFSD 190347
AFDFSD

Area Forecast Discussion
National Weather Service Sioux Falls SD
1047 PM CDT Wed Oct 18 2017

.SHORT TERM...(This evening through Thursday)
Issued at 247 PM CDT Wed Oct 18 2017

The cool high pressure that brought the marginally breezy 
conditions to the area will shift into northwest IA late tonight. 
This will allow for light winds most of the night there with an 
increasing south wind in central SD. This will help keep lows 
milder, in the lower to mid 40s, in south central SD with mid 30s 
possible in northwest IA. 

The southerly flow will spread across the area on Thursday with 
another warm day, albeit a little breezier. Northwest IA will be the 
last to see the stronger winds while central SD will average about 
15 to 25 mph from late morning on. Highs will be in the 70s.

.LONG TERM...(Thursday night through Wednesday)
Issued at 247 PM CDT Wed Oct 18 2017

Thursday night through Friday night will see the strongest winds 
with some potential for a wind advisory on Friday. With the strong 
winds at night lows will be in the 50s both Friday morning and 
Saturday morning, with highs in the 70s on Friday. Gusts on Friday 
will be about 35 to 40 mph and likely 20 to 25 mph both Thursday 
night and Friday night.

Upper level troughing will swing a cold front through late Friday 
night into Saturday morning. With broad warm advection ahead of this 
cool front and marginal instability, rain with isolated to scattered 
thunderstorms will be possible. 

Sunday into Monday a west northwest flow aloft will support 
continued mild temperatures, but more than likely highs will be in 
the 60s. Tuesday into Wednesday both the GFS and ECMWF strengthen 
the northwest flow aloft and start digging colder air into the 
region. This should bring afternoon temperatures back into the 50s 
along with a couple of breezy days. Precipitation chances are not 
great but with cold air aloft and northwest flow aloft maybe some 
afternoon instability showers.

&&

.AVIATION...(For the 06Z TAFS through 06Z Thursday night)
Issued at 1026 PM CDT Wed Oct 18 2017

VFR conditions through the TAF period. Gusty southerly winds will
arrive by late morning into Thursday evening. Models suggest LLWS
after 20/04Z at all terminals, but opted not to include for now 
due to low confidence. 

&&

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

$$

SHORT TERM...08
LONG TERM...08
AVIATION...05