Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 270446
AFDLSX

AREA FORECAST DISCUSSION...UPDATED AVIATION
NATIONAL WEATHER SERVICE ST LOUIS MO
1146 PM CDT Thu Mar 26 2015

.SHORT TERM:  (Through Late Tonight)
Issued at 318 PM CDT Thu Mar 26 2015

Clearing skies spread across eastern Missouri and Illinois this
afternoon as the storm system from overnight exited off into the
eastern CONUS. The broad upper level trough that brought shortwave
system and storms overnight will slowly shift east over the next
24 hours, but as that occurs we will have a fleeting chance for
some light precipitation late tonight as cold air sweeps south
across Missouri. Some light forcing on the western side of the
cool surface high tonight might result in some light precipitation
across central Missouri, but otherwise expect overnight lows to
bottom out in the upper 20s to lower 30s.

wfo lsx

.LONG TERM:  (Friday through Next Thursday)
Issued at 318 PM CDT Thu Mar 26 2015

With a large upper level trough still shifting east across the
region Friday, expectations are that the cold weather will persist
with some of the coldest daytime highs of the week likely.
However, the broader progressive northwest flow will keep the
region a bit active into the weekend, and therefore will allow
for a quick return of above normal temperatures by Sunday.
However, between now and Sunday we will have another little
clipper like system slide into Missouri and Illinois early
Saturday morning. Some light precipitation looks possible across
central into southeast Missouri, but with expected forecast
temperatures there are concerns about precipitation type. Have
continued to use a mix of rain and snow for the precipitation type
as a result.

Late in the weekend temperatures will return to more seasonally
normal levels as the large upper level trough and cool surface
ridge slide off to our east. Above normal temperatures will
persist into next work with another chance for thunderstorms
Wednesday into Thursday next week.

wfo lsx

&&

.AVIATION:  (For the 06z TAFs through 06z Friday Night)
Issued at 1145 PM CDT Thu Mar 26 2015

Shortwave is sliding south southeast through western MO as of 04z
Friday with mid cloud deck moving into taf sites. Further north,
vfr sc deck on back side of system is sliding south towards
forecast area. How far south it will make it is hard to pin down.
For now have it moving into KUIN and KCOU over the next several
hours. As for precipitation with this system, light activity
remains west of forecast area so kept all tafs dry including KCOU.
Winds to pickup from the north by mid morning with sct to broken
diurnal sc. By late afternoon/early evening on Friday will see
winds veer to the northeast ahead of next shortwave that will
slide through region late Friday night.

Specifics for KSTL:
Shortwave is sliding south southeast through western MO as of 04z
Friday with mid cloud deck moving into taf sites. Further north,
vfr sc deck on back side of system is sliding south towards
forecast area. How far south it will make it is hard to pin down.
Winds to pickup from the north by 15z Friday with sct to broken diurnal
sc. By 00z Saturday, will see winds veer to the northeast ahead
of next shortwave that will slide through region late Friday
night.

Byrd
&&

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

$$
WFO LSX




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