Winter Storm Warning
Statement as of 3:43 PM CST on December 20, 2013
... Winter Storm Warning in effect from 6 am Saturday to 6 am CST
The National Weather Service in Lincoln has issued a Winter Storm
Warning for significant icing and sleet... which is in effect from
6 am Saturday to 6 am CST Sunday.
* Timing... freezing rain is expected to begin west of the Illinois
River Saturday morning, and continue throughout the day. There
may be brief periods Saturday afternoon where temperatures warm
up enough to change the freezing rain to all rain, but then
colder air will change it back to all freezing rain early
Saturday night. The freezing rain will mix with sleet Saturday
night and then change to all snow early Sunday morning.
* Accumulations... ice accumulations around 0.25 to 0.30 inch will
be common Saturday into Saturday night. Total sleet and snow
accumulations are expected to range from 1 to 2 inches along the
Illinois River... with up to 3 inches around Galesburg.
* Wind... an increasing northeast wind of 10 to 20 mph from
Saturday afternoon into the evening may cause damage to ice
coated tree branches.
* Impacts... travel will become increasingly hazardous west of the
Illinois River Saturday morning through Saturday night as
roadways become icy. Untreated sidewalks and parking lots will
also become icy... creating a hazard for pedestrians. Smaller
tree branches are also expected to be damaged by the ice.
A Winter Storm Warning means significant amounts of ice and
sleet are expected. Gusty winds are also possible. This will make
Statement as of 9:28 AM CST on December 20, 2013
... A major storm system will affect central Illinois this
A combination of heavy rain... freezing rain... and snow continues
to get ready to develop and move toward portions of central
The first wave of precipitation will be associated with a cold
front that has reached northwestern Illinois at mid morning... and
will move southeast across central Illinois today as low pressure
in west central Illinois lift northeast into northern Indiana by
early evening. Scattered rain showers or drizzle will occur along
and head of this front and low pressure system. There is a slight
chance of light freezing rain or freezing drizzle later tonight
northwest of the Illinois River.
The main precipitation will develop early Saturday across the
south and expand northward into central Illinois Saturday
afternoon ahead of an approaching low pressure center. The rain
may be mixed with freezing rain during the day Saturday northwest
of I-55... with heavy rain farther southeast of I-55. The heaviest
rains are expected southeast of I-70... where 2 to 3 inches of total
rainfall will occur by the end of the weekend. Local 3 to 4 inch
amounts are possible near the Wabash River by Lawrenceville where
isolated thunderstorms are possible later Saturday and Saturday
On Saturday night into Sunday... the low center will move across
southern Illinois and then pull to the northeast... dragging colder
air into Illinois. The result will be rain or freezing rain changing
to snow Saturday night and into Sunday. Icing amounts could reach
around a tenth of an inch northwest of the Illinois River.
Snowfall amounts will also be the heaviest northwest of the
Illinois River... with 2 to 4 inches possible.
Details on this winter storm continue to evolve... and therefore
some of the more critical points remain uncertain. Stay alert
for later statements on this developing winter event.
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