Area Forecast Discussion
Issued by NWS St. Louis, MO

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FXUS63 KLSX 262329
AFDLSX

AREA FORECAST DISCUSSION...UPDATED AVIATION
NATIONAL WEATHER SERVICE ST LOUIS MO
629 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 00z TAFs through 00z Friday Evening)
Issued at 622 PM CDT Thu Mar 26 2015

Upper level shortwave to slide south through western MO tonight,
bringing in an increase mainly in mid and high clouds. KCOU will
be closer to energy and will see low end vfr cigs later this
evening, but precipitation to remain just west of KCOU. Though
would not be surprised to see some sprinkles there. On Friday,
will see vfr diurnal cu develop on back side of shortwave by mid
morning across region as winds pickup from the north. Then surface
ridge to build in, winds to lighten and cu to diminish towards end
of forecast period.

Specifics for KSTL:
Upper level shortwave to slide south through western MO tonight,
bringing in an increase mainly in mid and high clouds. On Friday,
will see vfr diurnal cu develop on back side of shortwave by 15z
Friday across region as winds pickup from the north. Then surface
ridge to build in, winds to lighten and cu to diminish after 23z Friday.

Byrd
&&

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

$$
WFO LSX




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