Area Forecast Discussion
Issued by NWS Central Illinois

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FXUS63 KILX 221928
AFDILX

Area Forecast Discussion
NATIONAL WEATHER SERVICE LINCOLN IL
228 PM CDT Mon Sep 22 2014

.SHORT TERM...(Tonight)
ISSUED AT 226 PM CDT MON SEP 22 2014

Large area of high pressure settling across the mid-Mississippi
Valley early this afternoon, centered from northern Missouri into
northwest Illinois. This will slowly drift southeast overnight. Dew
points most areas currently in the lower to mid 40s and that gives a
good indication of the overnight temperatures. Lows in the mid 40s
will be common overnight, with some locally cooler readings. Little
in the way of cloud cover will occur through the night.


&&

.LONG TERM...(Tuesday through Monday)
ISSUED AT 226 PM CDT MON SEP 22 2014

High pressure centered near Illinois on Monday will gradually shift
east by Wednesday as a shortwave moves across the Plains toward
Minnesota. Any surface reflection of low pressure with that wave
looks to dissipate across Iowa and N Missouri Wed and Wed night.
Then high pressure re-establishes itself across Illinois as the East
Coast high retrogrades westward. A Rex Block-type pattern seems to
develop for late this week into next weekend, keeping the dry
conditions into Sunday. There are some indications in the GFS and
ECMWF that a Gulf of Mexico low will lift into the ridge toward
southern Illinois on Sunday. By Monday, the low may drift into
Tennessee, with increasing lift and moisture into our far
southeastern counties. Areas SE of I-70 could see a few light
showers develop Monday afternoon as the weakening low passes nearby
to the SE. The All-Blend slight chance PoPs were left in the
forecast for the SE counties.

The thermal ridge will begin to advance eastward from the SW states
into the Plains this week, but Illinois will only see a minor
increase compared to points farther west. Still, a warming trend
looks on track for central Illinois through Thursday, as highs
progress from the lower 70s on Tuesday to the upper 70s-near 80 on
Thursday. Temps will then steady out through the weekend as they
linger near or slightly above normal through next week Monday.


&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon)
ISSUED AT 1225 PM CDT MON SEP 22 2014

VFR conditions should continue across the central IL terminal
airports through Tuesday. Clear skies to generally prevail with
just a few cumulus clouds around 3k ft possible from CMI east.
1027 mb high pressure near the IL/IA border and northern MO will
drift east across central IL tonight and into the Ohio river
valley on Tue. This will continue the fair/dry weather across
central IL, with no fog expected overnight due to dry airmass.
Winds to stay light out of the north near 5 kts today, then light
and variable to calm at times tonight, and light se winds after
14Z/9 am Tue.


&&

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

$$

SHORT TERM...GEELHART
LONG TERM...SHIMON
AVIATION...07






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