Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 192246
AFDLSX

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
546 PM CDT Tue Sep 19 2017

.SYNOPSIS...
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.

CVKING

&&

.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.

CVKING

.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.

CVKING

&&

.AVIATION...  (For the 00z TAFs through 00z Wednesday Evening)
Issued at 525 PM CDT Tue Sep 19 2017

Few cumulus clouds in the St Louis metro area will dissipate
early this evening due to the loss of daytime heating.
Southeasterly surface winds can be expected tonight. The surface
wind may be light enough for some fog to develop late
tonight/early Wednesday morning in SUS and CPS. There may be
scattered diurnal cumulus clouds along with high level cloudiness
mainly for UIN Wednesday afternoon ahead of an approaching cold
front. Southwesterly surface winds can be expected on Wednesday.

SPECIFICS FOR KSTL: Few cumulus clouds in the STL area will
dissipate early this evening due to the loss of daytime heating.
Southeasterly surface winds can be expected tonight with
south-southwesterly surface winds on Wednesday.

GKS

&&

.CLIMATE...
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)


&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...None.
IL...None.
&&

$$

WFO LSX



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