Area Forecast Discussion
Issued by NWS St. Louis, MO

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759
FXUS63 KLSX 250540
AFDLSX

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
1140 PM CST Fri Feb 24 2017

.SHORT TERM...  (Through Late Saturday Afternoon)
Issued at 328 PM CST Fri Feb 24 2017

The cold front is through the area at this time and into eastern
Illinois.  West wind behind the front has already dropped
temperatures into the 40s and 50s across all but southeast Missouri
and south central Illinois.  Wind will shift further to the
northeast this evening which will strengthen the cold advection. The
shortwave driving the front is still back over southeast Iowa into
western Kansas, and as it passes overhead tonight the tail end of
the precip over those areas should scrape western and northern
portions of our CWFA.  Water Vapor loop is indicating that the
deeper moisture associated with the core of the wave will stay
mostly north of the area, but some light rain, or light snow is
still possible.  Temperatures will continue to fall in the
northwest flow...bottoming out right around seasonal normals.  It
will feel pretty cold though since we haven`t seen lows in the 20s
to low 30s in more than a week!

Clouds will clear out on Saturday with high pressure building
overhead.  Seasonal temperatures will continue with highs in the low
to mid 40s along and south of the I-70 corridor cooling to the mid
and upper 30s further north.

Carney

.LONG TERM...  (Saturday Night through Next Friday)
Issued at 328 PM CST Fri Feb 24 2017

A fast moving quick shortwave will approach the area from the west
and bring a chance for rain and perhaps a few flurries very early
Sunday morning. Temperatures behind this feature on the day on
Sunday and Monday will be within seasonal values. A warm front
approaches from the south and west Monday night into early Tuesday
bringing in a good chance for rainfall to the area. This will also
bring the warmest day of the period to the area. A shortwave behind
the front will bring scattered showers over the area on Wednesday
before quickly exiting the area by Wednesday night. Temperatures
from Wednesday night onward will be seasonal for this time of the
year.



Kelly

&&

.AVIATION...  (For the 06z TAFs through 06z Saturday Night)
Issued at 1132 PM CST Fri Feb 24 2017

Area of MVFR cigs will continue to move thru the region overnight.
Have sped up timing of improvement at all sites. Is somewhat difficult
to determine how much lower cigs will impact COU but believe VFR
cigs shud arrive by 09z. Otherwise, strong and gusty nwly winds
will continue thru late afternoon Sat. Winds will then generally
back and become light and vrb Sat eve.

Tilly

&&

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

$$

WFO LSX



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