Area Forecast Discussion
Issued by NWS Central Illinois

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FXUS63 KILX 082120

Area Forecast Discussion
National Weather Service Lincoln IL
320 PM CST Fri Dec 8 2017

.SHORT TERM...(This evening through Saturday)
ISSUED AT 310 PM CST Fri Dec 8 2017

Ample sunshine and sw breezes helped boost temperatures into the
low to mid 30s by mid afternoon. High pressure over the mid MS and
Ohio river valleys, that provided a fair amount of sunshine to
central IL today, will give way to a clipper low pressure system
over western Ontario and ne MN that dives into central IL by
sunrise Sat and into IN by noon Sat. Latest forecast models
continue to trend slower with arrival of light snow from this
feature, pushing se over central and ne IL during overnight, and
lingering in eastern IL mainly east of I-57 Sat morning. Snowfall
amounts still appear quite light, around a half inch from I-74 ne
with up to 1 inch ne Vermilion county around Hoopeston. Just some
flurries from Springfield sw later tonight into early Sat morning.
Light snow will diminish over eastern IL during late Saturday
morning with CWA dry by noon Sat. Lows tonight in the low to mid
20s. Highs Saturday mostly in the lower 30s, with some upper 20s
ne of I-74 where a light snow cover possible. Brisk nw winds
gusting 20-30 mph will make it feel colder on Saturday.


.LONG TERM...(Saturday night through Friday)
ISSUED AT 310 PM CST Fri Dec 8 2017

A deep upper level trof will persist over the Great Lakes region
and eastern states much of next week, with a few more clipper
systems tracking se and bringing periodic chances of light
precipitation. Though most of the time it should be dry and
temps will stay on the cool side over central and southeast IL.

Another cold night expected Sat night with lows 15-20F as clouds
and winds diminish. The next clipper system takes a further ne
track across the central great lakes during Sunday keeping its
light snow well ne of central IL. Partly to mostly sunny skies
expected Sunday with milder highs in the mid to upper 30s over
east central IL and lower 40s sw of I-74, with mid 40s from
Jacksonville sw.

A 3rd clipper moves se into central Lake MI by sunset Monday,
while our CWA continues to stay dry Sunday night and Monday.
West to SW breezes ahead of that clipper on Monday will moderate
temps into the lower 40s from I-74 ne and upper 40s sw CWA and
likely be the mildest day of next week. Have a slight chances of
light snow showers Monday night ne of I-74 as tail end of clipper
system passes by. Most of our area should remain dry Monday
night. Colder air to arrive behind this clipper on Monday night
and Tue. Lows Monday night of 19-25F with highs Tue upper 20s ne
half and lower 30s sw half of CWA. Dry and chilly wx expected Tue
through Wed as another clipper dives into the western Great Lakes
Wed. Have isolated light snow showers or flurries possible Wed
evening then isolated light mixed pcpn chances Thu and Friday
mainly in the afternoon hours. Highs Wed in the mid to upper 30s,
with some lower 30s ne of I-74. Highs Thu and Fri edge up into
the upper 30s and lower 40s, and mildest sw CWA which is close to
normal for mid Dec.


.AVIATION...(For the 18Z TAFS through 18Z Saturday afternoon)
Issued at 1155 AM CST Fri Dec 8 2017

VFR conditions are expected to continue across the central IL
airports through 08Z as mid and high clouds increase from the nw
after sunset. A clipper system north of MN over western Ontario
will dive into central IL between 09-12Z Sat and bring a chance of
light snow and flurries to areas ne of SPI. Ceilings will drop to
MVFR of 2-3k ft between 08-12Z and linger Sat morning. Upper level
short wave trof to shift east of IL toward 18Z/noon on Saturday.
SW winds of 10-15 kts and gusts near 20 kts early this afternoon
to gradually diminish to around 10 kts by sunset. Winds shift west
early overnight and then NW later tonight into Sat and increase to
12-17 kts and gusts of 18-25 kts late tonight and Sat morning.




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