Osco, Illinois Weather Forecast Discussion

198
FXUS63 KDVN 261910
AFDDVN
Area Forecast Discussion
National Weather Service Quad Cities IA IL
210 PM CDT Fri Sep 26 2025
.KEY MESSAGES...
- Patchy fog possible Saturday morning, mainly in river valleys and
  low-lying areas.
- The extended period of dry conditions and above-normal
  temperatures continues into early October.
&&
.SHORT TERM /THROUGH SUNDAY/...
Issued at 210 PM CDT Fri Sep 26 2025
Mid-level ridging has taken control of the region this
afternoon in between cutoff energy over the southwest and
southeast CONUS. Abundant sunshine has allowed for quick warming
of temperatures through the day and highs will top out in the
low to mid 80s. Light winds and clear skies will favor at least
some patchy fog development overnight, although increasing low-
level winds may keep the fog potential even less than the past
couple of mornings. Still think river valleys and low-lying
areas could see some patchy fog Saturday morning with any fog
burning off quickly with sunrise. Little change is expected
through the weekend. A shortwave will push a weak surface front
into the area tomorrow afternoon and evening, but ridging
quickly builds back overhead on Sunday. Expect conditions to be
very similar to today this weekend with sunny skies and highs
in the 80s.
&&
.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
Issued at 210 PM CDT Fri Sep 26 2025
The ridge gets squeezed early next week between a shortwave lifting
northeast across the Central Plains and the tropical system as
it moves towards the southeast US. Even so, ensembles favor the
ridge holding strong over the region, keeping conditions warmer
than normal and dry through the majority of next week. Mid and
high cloud cover increases somewhat Tuesday-Wednesday as the
Plains wave ejects into the Upper Midwest, but sunny skies will
dominate. Low humidity will allow for cool mornings and warm
afternoons; highs will hold steady in the 80s with lows in the
50s.
&&
.AVIATION /18Z TAFS THROUGH 18Z SATURDAY/...
Issued at 1203 PM CDT Fri Sep 26 2025
VFR conditions expected. West-southwest winds of 5-10 kts weaken
with sunset this evening before increasing to near 10 kts again
by mid-morning Saturday. There is some potential for fog again
tonight, but confidence in impact to terminals is too low for
inclusion.
&&
.CLIMATE...
Issued at 233 AM CDT Thu Sep 25 2025
The latest 8-14 day temperature outlook from the Climate
Prediction Center shows very high probabilities (70%) of above
normal temperatures for the Oct 2nd to Oct 8th timeframe. Normal
highs for this period are in the upper 60s/lower 70s and normal
lows are in the mid to upper 40s. While above normal
temperatures are likely, the humidity levels will be tolerable.
&&
.DVN WATCHES/WARNINGS/ADVISORIES...
IA...None.
IL...None.
MO...None.
&&
$$
SHORT TERM...Flanagan
LONG TERM...Flanagan
AVIATION...Flanagan
CLIMATE...Gross

NWS DVN Office Area Forecast Discussion