Area Forecast Discussion
Issued by NWS Sioux Falls, SD

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FXUS63 KFSD 290752

Area Forecast Discussion
National Weather Service Sioux Falls SD
252 AM CDT Thu Jun 29 2017

.SHORT TERM...(Today and Tonight)
Issued at 225 AM CDT Thu Jun 29 2017

Main wave continues to slide east, while a weaker wave is progged
to move over the area during the day, so expect showers for most
of the day today. Location of the warm front will determine the
northern extent of more significant type of storms/weather. Models
vary greatly with its placement and with the ongoing convection
across Iowa and Nebraska masking its current location. I think
the warm front is currently further south than what the models
depict. All models bring the warm front north during the day, but
right now I`m leaning toward the more southern location
solutions. Storms will still develop along elevated warm front and
hence went with higher pops across southern sections of the CWA,
but feel even higher pops will be to the south of forecast area.
Severe Weather possible today, but the bigger threat will be
south of the area where better shear is forecast to occur per
model soundings.

Storms will be a little slow to exit the area, but expect most of
the activity to be to the east by 12z Friday. Temperatures will be
cooler today than those of yesterday due to influence of the
cooler air behind yesterday`s front, but also because of cloud
cover and precip.

.LONG TERM...(Friday through Wednesday)
Issued at 225 AM CDT Thu Jun 29 2017

Northwest flow takes over on Friday, with cold air advection regime
creating elevated instability. Ongoing convection from the overnight
hours will exit to the east in the morning, with a possible lull in
activity late morning into midday. Elevated front moves through in
the afternoon, and will spark additional scattered showers and non-
severe thunderstorms primarily in the afternoon and early evening.
Activity is expected to diminish around sunset. Highs will be a
degree or two cooler than today, in the 70s.

Saturday will be quite pleasant with dry northwest flow aloft and
relatively light surface winds shifting to the south or southwest.
Skies will be mostly clear to partly cloudy with mild temperatures
in the mid 70s to mid 80s.

Sunday will see highs in the 80s areawide. Shower and thunderstorm
chances increase in the afternoon and evening as a shortwave dives
across the region and a warm front potentially sets up near
northwest Iowa and the Missouri Valley. Secondary wave will keep
unsettle weather into Monday, with additional chance for

Upper ridge begins to rebound on Tuesday and Wednesday, but models
also begin to diverge quickly heading into Wednesday night and
Thursday. Temperatures will be warmer, with the lower 90s returning
to south central SD.


.AVIATION...(For the 06Z TAFS through 06Z Thursday night)
Issued at 1038 PM CDT Wed Jun 28 2017

Spotty showers and isolated thunderstorms will be possible west of
Interstate 29 late tonight into tomorrow morning. Stronger
showers and thunderstorms will be possible tomorrow afternoon and




SHORT TERM...Heitkamp
AVIATION...08 is the U.S. government's official web portal to all federal, state and local government web resources and services.