Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 250436
AFDLSX

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
1136 PM CDT Mon Jul 24 2017

.UPDATE...
Issued at 907 PM CDT Mon Jul 24 2017

The stationary front remains south and west of the area at mid
evening. Skies are mostly clear across Missouri and Illinois and
will remain that way. Winds will remain light as high pressure
moves southeast across the Great Lakes. Dewpoints are now in the
60s, so with clear skies and light winds, lows in the mid-upper
60s except in the metro area look good tonight.

Britt

&&

.SHORT TERM...  (Through Late Tuesday Afternoon)
Issued at 247 PM CDT Mon Jul 24 2017

Isolated to scattered thunderstorms are possible through the evening
hours over the southern CWA due to the combined effects of a stalled
frontal boundary, diurnal heating, and orographic lift along the
eastern Ozarks. Overnight lows will be in the mid-60s to around 70
tonight, maintaining some relief from the recent heat wave.

An upper ridge will begin to shift eastward tonight, and the rising
heights will bring gradually increasing temperatures back into
MO/IL. Highs on Tuesday will be a few degrees warmer than Monday,
and the heat index is forecast to reach the upper 90s across parts
of the area. A more significant warming trend is then expected
during the middle of the week (see discussion below).

Kanofsky

.LONG TERM...  (Tuesday Night through Next Monday)
Issued at 247 PM CDT Mon Jul 24 2017

After a brief respite from the heat a new upper level ridge edges
it`s way into the CWA Tues. night into Wed. Temps should once again
reach the upper 90`s Wed with heat index values of 105-110.

An upper low moving from the high plains into the Great Lakes region
late Wed night/early Thurs will bring a cold front through the CWA.
Showers and thunderstorms are possible throughout the day on Thurs
with this frontal passage. Timing of the precip has slowed down over
the past few model runs. Expect northern areas of the CWA to begin
to see precip in the early morning  Thurs, while STL metro will be
after daybreak. The tail end of precip should be out of the southern
CWA by Friday morning.

Beginning Friday a surface high with northerly surface flow and
normal to below normal temps will dominate throughout the weekend.

Walsh

&&

.AVIATION...  (For the 06z TAFs through 06z Tuesday Night)
Issued at 1132 PM CDT Mon Jul 24 2017

Scattered thunderstorms over the eastern Ozarks are expected to
dissipate overnight and stay well south of the terminals.
Otherwise...dry and VFR conditions are expected through the
period. Light winds will veer from north to east as high pressure
moves through the Great Lakes.

SPECIFICS FOR KSTL:

Dry and VFR conditions are expected through the period. Light
winds will veer from north to east as high pressure moves through
the Great Lakes.

Britt

&&

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

$$

WFO LSX



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