Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 282326
AFDLSX

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
626 PM CDT Sun May 28 2017

.SHORT TERM...  (Through Late Monday Afternoon)
Issued at 326 PM CDT Sun May 28 2017

Weak cold front was moving southeastward through southeastern MO and
southwestern IL this afternoon.  Still getting isolated showers
along and just behind this front in southeast MO and southwest IL,
and ahead of a northwest flow shortwave dropping southeastward
through our area.  Any showers should dissipate or shift southeast
of the forecast area by early evening with continued clearing of the
sky. Cooler conditions are expected tonight with good radiational
cooling due to a clearing sky, surface winds becoming light, and
relatively low surface dew points late tonight.  Although it will be
cooler tonight, the lows will only be a couple of degrees below
normal for late May.  Another northwest flow shortwave and an
associated weak cold front may bring a few showers or thunderstorms
to parts of our area Monday afternoon.  Despite increasing cloud
cover on Monday, highs will be warmer across southeast MO and
southwest IL ahead of the cold front.

GKS

.LONG TERM...  (Monday Night through Next Sunday)
Issued at 326 PM CDT Sun May 28 2017

The synoptic pattern at the start of the long term period will
feature a broad trough across much of the central CONUS into the
Great Lakes region.  This regime will largely persist through the
period, keeping northwest flow in place through much of the
extended.

Tuesday will be mostly dry during the daylight hours, but a few
showers and thunderstorms may creep into portions of
northern/central MO through the evening and overnight hours as a
warm front attempts to lift northward through the area.

The front should settle to the south of the area on Wednesday,
keeping the region dry.  However, Thursday into the upcoming weekend
will feature the front lifting back north of the region.  This will
allow for warmer and more unstable conditions to return, bringing
with it the chance for scattered showers and thunderstorms.
Temperatures Tuesday and Wednesday will be fairly seasonal (in the
upper 70s to low 80s) with low humidity values, but as the front
lifts back north the humidity will increase on Thursday into the
weekend with highs climbing back into the 80s.

KD

&&

.AVIATION...  (For the 00z TAFs through 00z Monday Evening)
Issued at 624 PM CDT Sun May 28 2017

Few isolated showers south of KUIN should dissipate over the next
couple hours with loss of instability. Rest of night will remain
dry with light west/northwest winds along with a clear to mostly
clear sky. Secondary front moves through the area tomorrow so
cannot rule out isolated showers/storms. Probabilities much too
low at the moment to mention in TAFs however.


SPECIFICS FOR KSTL:

Dry night expected with light west/northwest winds along with a
clear to mostly clear sky. Secondary front moves through the area
tomorrow so cannot rule out isolated showers/storms in the mid-
late afternoon hours. Probabilities much too low at the moment to
mention in TAFs however.

Gosselin

&&

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

$$

WFO LSX


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