Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 191859

Area Forecast Discussion
National Weather Service Saint Louis MO
159 PM CDT Tue Sep 19 2017

Issued at 146 PM CDT Tue Sep 19 2017

The weather story the remainder of this week will be the summer
heat and humidity. Afternoon high temperatures are forecast to be
in the lower to middle 90s through Friday with heat index values
around 100 degrees.



.SHORT TERM...  (Through Late Wednesday Afternoon)
Issued at 146 PM CDT Tue Sep 19 2017

Synoptic warm front will slowly move across the area through
tomorrow morning with a light southeast wind becoming southwest.
This favorable wind direction, coupled with increasing heights
should send temperatures into the lower to middle 90s tomorrow
afternoon. A weak cold front will try to enter the far northern
stretches of the CWA by afternon, with an associated slight
chance of showers and thunderstorms. Believe best threat of
rainfall will hold off until Wednesday evening and overnight for
these location.


.LONG TERM...  (Wednesday Night through Next Tuesday)
Issued at 146 PM CDT Tue Sep 19 2017

Heat and humidity will continue through at least Friday as an
impressive upper level ridge builds overhead. Each day
temperatures are expected to top out in the lower to middle 90s
and afternoon heat index values will be near 100 degrees. The
threat of thunderstorms should be confined to Wednesday night and
Thursday morning across northeast Missouri as a cold front
attempts to move into the CWA. Otherwise, dry conditions are
expected into the weekned for the majority of the CWA.

The upper level ridge will slowly begin to shift east by the end
of the weekend with temperatures returning closer to average next
week with at least a chance of some precipitation.



.AVIATION...  (For the 18z TAFs through 18z Wednesday Afternoon)
Issued at 1159 AM CDT Tue Sep 19 2017

Dense fog from this morning has dissipated with a scattered deck
of cumulus taking hold across the area for the afternoon. Could
still see an isolated thunderstorm given proximity to warm front,
but most locations will remain dry. Light southeast wind will
continue until tomorrow when wind direction will become southwest
and increase.

VFR expected with a light southeast wind becoming southwest



Issued at 146 PM CDT Tue Sep 19 2017

Record High Temperatures Through Saturday

              KSTL  KCOU  KUIN
Sept 20     96 (1940)   98 (1893)   95 (1940)
Sept 21     97 (1881)  100 (1893)   95 (1940)
Sept 22     95 (1956)   97 (1937)   96 (1937)
Sept 23     94 (1891)   94 (2007)   95 (1937)




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