FXUS63 KILX 240208

Area Forecast Discussion
National Weather Service Lincoln IL
908 PM CDT Wed May 23 2018

Issued at 906 PM CDT Wed May 23 2018

Quiet weather is expected across central and southeast Illinois
overnight with high pressure and an associated dry air mass in
place. Going forecast is in good shape and only minor tweaks to
the hourly trends are necessary at this time.


.SHORT TERM...(This evening through Thursday night)
ISSUED AT 300 PM CDT Wed May 23 2018

Fair and dry weather expected to continue across central and
southeast IL through Thursday night. Upper level ridge over the MS
river valley and IL through Thursday along with surface high
pressure ridge spreading across the southern Great Lakes and into
the mid Atlantic States, will keep it dry with fair skies. Few to
scattered cumulus clouds with bases of 4-5k ft from Galesburg to
Springfield west will diminish and/or retreat to the west late
this afternoon and early evening with east winds bringing in drier
air as dewpoints slip into the 50s. Drier air will also limit
patchy shallow ground fog formation toward daybreak and left out
of forecast. Lows overnight in the lower 60s, with some upper 50s
over drier air (dewpoints in the lower 50s) from Bloomington and
Champaign ne. Temps currently in the low to mid 80s across CWA.
Expect temps to rise a few degrees higher tomorrow with highs in
the mid to upper 80s with ample sunshine, warmest in western CWA
where 850 mb temps around 16C. Humidity levels stay fair low yet
on Thu with dewpoints in the mid to upper 50s central and eastern
IL, and lower 60s in western CWA. Lows Thu night of 60-65F, with
coolest readings around 60F in east central IL and mildest western

.LONG TERM...(Friday through Wednesday)
ISSUED AT 300 PM CDT Wed May 23 2018

An upper level trof over the Northwest US and northern Rockies to
open up/weaken as it moves east to WI and the IA/IL border by
sunset Friday. Surface high moves off the mid Atlantic States
Friday with a southerly flow bringing very warm and starting to
bring in more humid air. Highs Friday in the upper 80s with
dewpoints elevating into the low to mid 60s. Isolated showers and
thunderstorms possible from I-55 west Friday afternoon/evening.
Isolated convection possible in eastern IL too overnight Friday
night. Have 20-30% chance of convection on Saturday as weakening
upper level trof moves through, and into the Ohio river valley by
Sat night. Have 30% pops from I-55 east by Sat afternoon with 20%
west of I-55 on Saturday. Highs Sat in the upper 80s to near 90F
with afternoon heat indices of 90-95F.

Isolated convection could linger in southeast IL Sat night and
Sunday with another very warm and rather humid day with highs in
the upper 80s and lower 90s and afternoon heat indices of 90-95F.
Models have trended drier Sunday night through Monday as upper
level ridge builds back over IL. Summerlike heat and humidity to
likely prevail through next Wed with highs in the upper 80s to
near 90F. A weak cutoff upper level low lifting slowly northward
over the gulf of Mexico and into the southeast states by middle of
next week could return isolated convection to southeast IL by Tue
afternoon and over the CWA by next Wed.


.AVIATION...(For the 00Z TAFS through 00Z Thursday evening)
Issued at 655 PM CDT Wed May 23 2018

High pressure will dominate the weather pattern across the central
Illinois terminals through the 00Z TAF valid time. Light/variable
winds tonight will trend southeast on Thursday. Little to no cloud
cover is expected, and any clouds should remain well into the VFR




Back to Main Forecast Discussion Page