Area Forecast Discussion
Issued by NWS St. Louis, MO

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000
FXUS63 KLSX 190458
AFDLSX

AREA FORECAST DISCUSSION...UPDATED AVIATION
NATIONAL WEATHER SERVICE ST LOUIS MO
1158 PM CDT Thu Sep 18 2014

.SHORT TERM:  (Through Late Tonight)
Issued at 321 PM CDT Thu Sep 18 2014

High pressure centered across the Great Lakes continues to advect
dry low level airmass into the region, which along with the
September sun was able to break the stratus up across Illinois and
the eastern half of Missouri.  Expect there could be some valley fog
that develops overnight, but otherwise quiet weather expected with a
light southeast wind.

CVKING

.LONG TERM:  (Friday through Next Thursday)
Issued at 321 PM CDT Thu Sep 18 2014

By Friday, surface ridge to move off to the east allowing warmer
southerly flow to return to the region. Highs on Friday will be in
the mid to upper 70s and in the low to mid 80s on Saturday.

In the meantime, next weather system to move in by Saturday
afternoon with showers and thunderstorms developing and spreading
southeast across region as cold front moves through. Best chances of
precipitation will be Saturday night before tapering off Sunday
morning.

On Sunday after system exits, begin to cool back down as next ridge
of high pressure builds in. Cooler and drier weather to persist
through the middle of next week with highs in the 70s and lows in
the 50s.

Byrd

&&

.AVIATION:  (For the 06z TAFs through 06z Friday Night)
Issued at 1150 PM CDT Thu Sep 18 2014

Radiational fog has already begun developing across portions of
the area and will continue to develop overnight. All of the
terminals expect KSTL should see visibilites drop to at least the
MVFR range with KSUS to LIFR. Fog will lift by 14z with VFR
conditions the remainder of the day on Friday.

Specifics for KSTL:

Patchy fog is expected across the area overnight but the feeling
at this time is that KSTL will remain void of fog with a vsby
greater than 6sm. VFR conditions expected Friday and Friday evening.

Glass

&&

.LSX WATCHES/WARNINGS/ADVISORIES:
MO...NONE.
IL...NONE.
&&

$$

WFO LSX





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