Area Forecast Discussion
Issued by NWS Central Illinois

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FXUS63 KILX 212311
AFDILX

Area Forecast Discussion
NATIONAL WEATHER SERVICE LINCOLN IL
611 PM CDT Tue Oct 21 2014

.SHORT TERM...(Tonight)
ISSUED AT 251 PM CDT TUE OCT 21 2014

Deep low over Lake Erie this afternoon, with north-northwesterly
flow over Illinois.  Cool air advecting in and some cloud cover
mostly to the north and the east.  Afternoon cu will clear shortly
before sunset, leaving the more persistent clouds out of ILX
territory.  Clearing overnight with light winds will allow some
pretty efficient radiational cooling and the temps will drop into
the upper 30s.  Forecast lows are in the middle of the MOS guidance
this afternoon. Shallow moisture will further mix out as the
afternoon progresses and will have to monitor for xover temps this
evening with regards to fog development.  Biggest concern will be in
the eastern portion of the CWA with dwpts still in the 40s and slow
to mix out with so many clouds aloft.

&&

.LONG TERM...(Wednesday through Tuesday)
ISSUED AT 251 PM CDT TUE OCT 21 2014

Models continue in good agreement with the mid level ridging
tracking toward the area tomorrow and to the east of IL by Thur
morning. This will keep pleasant and dry weather in the area through
tomorrow night. Then, I mid level trough and associated surface
front will push into the area on Thursday and bring a chance of
showers to the CWA for Thursday through Thursday evening. This front
will push into the sfc high pressure area and pinch it off with some
of the ridging going south. The weather system will also weaken some
as it moves into the area and this will lead to the pcpn diminishing
while moving east. Once this system weakens and moves east of IL,
dry weather will return for the rest of the week.

Temps through the short term will start cool but then warm back to
close to normal for Friday.

A pleasant weekend is in store for central and southeast Illinois as
high pressure returns with dry and warmer conditions. Mid level
ridging will also be in place for the weekend and the beginning of
next week. Unfortunately, this ridge will be short lived and another
weather system is forecast to move toward the are from the west.
Models handle this system similarly and bring pcpn chances into the
area for mainly Monday night. Pops will remain small until models
have a better handle on the moisture return ahead of the system.

Temps will very warm through Monday, for the later part of October,
but then cool-down for Tue as the next system moves through the
area.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
ISSUED AT 611 PM CDT TUE OCT 21 2014

Surface high pressure settling over Illinois will bring light
winds veering to southeasterly over the next 24 hours. Skies
already clear west of KCMI-KLWV, and sct-bkn040 skies to the east
expected to clear by 04Z. Low level moisture indicates fog
possible overnight, however persistent light winds should keep fog
thin, generally no worse than MVFR visibility. Therefore, have
continued temporary MVFR fog from 10Z-12Z in TAFS.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM...HJS
LONG TERM...Auten
AVIATION...Onton






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