Area Forecast Discussion
Issued by NWS Sioux Falls, SD

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FXUS63 KFSD 181948

Area Forecast Discussion
National Weather Service Sioux Falls SD
248 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 18Z TAFS through 18Z Thursday afternoon)
Issued at 131 PM CDT Wed Oct 18 2017

VFR conditions expected through the period. Cold front moving
through the area with gusty conditions concentrated behind the
front. Winds will decrease overnight, but increase once again
during the day on Thursday.




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