Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 241937

Area Forecast Discussion
National Weather Service Saint Louis MO
237 PM CDT Sat Jun 24 2017

.SHORT TERM...  (Through Late Sunday Afternoon)
Issued at 235 PM CDT Sat Jun 24 2017

Weak cold front will quickly progress through the CWA overnight
tonight. Slight increase in midlevel cloudiness along with a wind
shift from the southwest ahead of the front back to the northwest
behind the boundary. With a mostly clear sky for most of the area
during a majority of the overnight hours and light winds in close
proximity to the front, lows tonight should be seasonably chilly as
temperatures bottom out in the low to upper 50s.

Sunday will be quite a similar day as today with a sunny or mostly
sunny sky and fairly brisk northwest winds. Expect high temperatures
to be in the upper 70s to low 80s, basically a persistence forecast.


.LONG TERM...  (Sunday Night through Next Saturday)
Issued at 235 PM CDT Sat Jun 24 2017

Somewhat amplified upper pattern that will be over the CONUS on
Sunday night will turn zonal by midweek as trough over the Great
Lakes moves off to the east and the ridge over the west coast
dampens out.  A surface high will move across Missouri on Sunday
night and early Monday causing winds to turn light.  There will be a
chance of showers and thunderstorms over the area late Monday into
Monday night as a shortwave trough moves across the area in
northwesterly flow aloft.  Tuesday through Thursday should be mostly
dry as the GFS/ECMWF are showing a ridge over the the southeast and
the cold front staying mainly north of the area.  By Friday and
Saturday, both models show the front moving slowly south through
Missouri and Illinois which will bring showers and thunderstorms
both days.

Temperatures will be below normal to start the week as 850mb
temperatures start out in the 7-10C range before climbing into
the 15-20C range by the end of the week. This falls in line well
with the GEFS mean values which show temperatures going from
below normal to near-above normal mid-late week.



.AVIATION...  (For the 18z TAFs through 18z Sunday Afternoon)
Issued at 1227 PM CDT Sat Jun 24 2017

Mostly clear sky with just a few diurnal cumulus this afternoon.
Dry/VFR conditions should continue overnight tonight into Sunday
as well. Weak front will move through overnight tonight with NW
winds lightening up, then backing to the southwest ahead of the
front. Behind the front, winds will become predominantly
northwesterly again and increase in speed throughout the morning
hours on Sunday.


Dry/VFR through the period. Northwest winds will slacken this
evening and back to the southwest ahead of a weak cold front.
Behind the boundary, winds will once again become predominantly
northwesterly and increase in speed through early Sunday





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