Area Forecast Discussion
Issued by NWS Central Illinois

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000
FXUS63 KILX 270927
AFDILX

Area Forecast Discussion
NATIONAL WEATHER SERVICE LINCOLN IL
327 AM CST Tue Jan 27 2015

.SHORT TERM...(Today)
ISSUED AT 326 AM CST TUE JAN 27 2015

What we feared yesterday morning at this time panned out with the
freezing drizzle breaking out late yesterday afternoon and evening
along the tail end of the band of light snow that brought a few
areas a half inch to one inch of snow. The 4km WRF forecast soundings
were showing the ice crystals departing around 400 pm yesterday
afternoon with some weak omega/lift remaining in the low levels of
the atmosphere where moisture was still present, along with just
enough shear in the 950-850mb layer. Radar mosaic showing the last
batch of light snow and freezing drizzle tracking south through east
central Illinois early this morning and based on the present
movement, most of it should push out of our forecast area by 14z.
Based on that, we will continue the Freezing Rain Advisory until
the expiration time of 600 am.

Current surface analysis indicating weak low pressure shifting to
our south with an inverted trof extending north from the low through
central and northern Illinois. The main forecast concern today will
be with temperatures as the extensive cloud cover is expected to hold
over our area as forecast soundings depict most of the low level
moisture trapped beneath a strengthening subsidence inversion thru
the day. We are seeing some breaks in the cloud cover from time to
time early this morning but as our boundary layer winds become more
north to northeast, the large area of low clouds to our north will
filter south across our area today. Coolest readings, generally in
the lower 30s, will be found over our east and northeast counties,
while over far southwest Illinois, look for afternoon temperatures
around 40 degrees.

&&

.LONG TERM...(Tonight through Tuesday)
ISSUED AT 326 AM CST TUE JAN 27 2015

Low clouds to decrease during the evening as 1027 mb high pressure
drifts over IL/IN by overnight. Lows tonight range from upper teens
to near 20F ne counties (where clearing may occur soonest) to mid
20s sw counties. High pressure drifts east into eastern Ohio river
valley by 18Z/noon Wed and get a breezy SSE flow developing over IL
and bringing in milder air with partly to mostly sunny skies. Highs
Wed range from lower 40s eastern IL to the upper 40s to around 50F
from Jacksonville west to the MS river.

Low pressure ejects east from northern Rockies into western Great
Lakes by dawn Thu and pulls cold front east across IL late Wed night
into Thu morning. This to bring chances of light rain overnight Wed
night into Thu morning and possibly lingering over eastern IL Thu
afternoon where light snow could mix in over northern counties
before ending. Lows Wed night of 33-38F with coolest readings in
east central IL. Highs Thu in upper 30s and lower 40s central IL and
mid 40s in southeast IL southeast of I-70.

1040 mb Canadian high pressure moves down into the Midwest Friday
and returns mostly clear to partly cloudy skies and cooler
temperatures Thu night through Fri night. Cooler highs Friday of
30-35F. Most of Saturday now appears dry over central and eastern IL
with chance of light snow/rain moving into west central IL later
Saturday ahead of next storm system. Seasonable highs Saturday in mid
to upper 30s.

00Z extended models show more phasing of southern and northern
stream system this weekend and bring better chances of light snow to
central and southeast IL Sat night into Sunday evening as surface
low deepens ne from southeast Texas into the eastern OH/TN river
valleys. This could bring a few inches of snow accumulations
especially in southeast IL where even a mix of precipitation appears
possible south of Highway 50. Another Canadian high to drift
southeast into IL early next work week bringing colder/below normal
temperatures.

&&

.AVIATION...(For the 06Z TAFS through 06Z Tuesday night)
ISSUED AT 1136 PM CST MON JAN 26 2015

MVFR to LIFR conditions will continue across the TAF sites
overnight. With area remaining in cyclonic flow and a surface
front being over the area through most of the TAF period, believe
clouds will remain over the sites next 24hrs. TAF sites along and north
of this boundary will see cigs below 1kft through most of the
period, and then rising during the evening hours tomorrow. Other
sites like PIA, DEC and SPI will remain MVFR through tomorrow
afternoon. All sites except for SPI have vis of 5SM or less but
will improve during the morning and afternoon hours. Conditions
could improve more during the evening hours, but only become
broken sky cover with cig heights about the same as during the
day, just becoming MVFR for BMI and CMI. Winds will be light from
the southwest and then become northwest in a few hours, then by
morning, northerly with gusts to near 15kts. Then lighter by
afternoon, then light and variable winds return for tomorrow evening.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
FREEZING RAIN ADVISORY until 6 AM CST early this morning FOR
ILZ030-031-038-043>046-053>057-062-063.

&&

$$

SHORT TERM...Smith
LONG TERM...07
AVIATION...Auten



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