Area Forecast Discussion
Issued by NWS Central Illinois

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

FXUS63 KILX 252309

Area Forecast Discussion
National Weather Service Lincoln IL
609 PM CDT MON JUL 25 2016

.SHORT TERM...(This evening through Tuesday)
ISSUED AT 258 PM CDT Mon Jul 25 2016

Despite cold front dropping southward toward the Ohio River Valley,
the airmass remains quite moist across central Illinois this
afternoon, with 18z/1pm surface dewpoints generally in the lower to
middle 70s.  The significantly drier air lags well behind the front
across Iowa and far northern Illinois where dewpoints have mixed
into the lower to middle 60s.  Mid/high clouds currently blanketing
the area will gradually push E/SE and should be largely confined to
locations along and south of the I-70 corridor tonight.  12z Jul 25
models all show scattered showers and thunderstorms across the SE
KILX CWA this afternoon and tonight, while areas further north
gradually clear out.  Have maintained low chance PoPs along/south of
I-70 through tonight accordingly.  Elsewhere around the area, have
gone with a dry forecast with patchy fog developing overnight.

High pressure will build into the Great Lakes on Tuesday, providing
mostly sunny and dry weather across most of the area.  The exception
will be south of I-70, where a few showers and thunderstorms will
remain a possibility in closer proximity to the stalled frontal
boundary near the Ohio River.  High temperatures will reach the
middle to upper 80s.

.LONG TERM...(Tuesday night through Monday)
ISSUED AT 258 PM CDT Mon Jul 25 2016

High pressure will slowly drift east of the area Tuesday night and
allow the frontal system to begin to lift back north and become
oriented northwest to southeast across MO and into southern IL. As
the high pressure continues to move east the front out west will
slowly get closer to the CWA and bring the return of showers and
thunderstorms to the southwest third of the state beginning Wed.
Then more showers and storms will advect northward as the front
lifts further north and then cover the entire CWA Wed night and
Thur. As the associated mid level trough rotates through the area,
somewhat cyclonic flow/northwest flow will setup. This will keep the
sfc boundary near the area through the rest of the week, which will
keep chance of showers and thunderstorms over the CWA through the
rest of the week and into the weekend. Things should improve some
the latter part of the weekend as the chance of showers and
thunderstorms will be limited to the east and southeastern parts of
the CWA.

High pressure will also bring cooler temps for Wed and Thur. And
with cyclonic/northwest flow setting up over the area, slightly
cooler temps will prevail the remainder of the week and into the


.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 604 PM CDT Mon Jul 25 2016

Except for the potential for a brief period of MVFR vsbys in fog
in the 09z-13z time frame, VFR conditions are expected over the
remainder of the forecast period. Light and variable winds tonight
will be light northeasterly on Tuesday.


.ILX Watches/Warnings/Advisories...


AVIATION...Smith is the U.S. government's official web portal to all federal, state and local government web resources and services.