Fox River Grove, Illinois Weather Forecast Discussion

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FXUS63 KLOT 071736
AFDLOT
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1236 PM CDT Sun Sep 7 2025
.KEY MESSAGES...
- Unseasonably cool conditions through Monday morning.
- Low chances (20%-30%) for showers midweek.
- Warming trend to average or above temperatures mid-late week.
&&
.DISCUSSION...
Issued at 240 AM CDT Sun Sep 7 2025
Through Monday:
The main longwave trough and associated embedded shortwave
troughs that have been a persistent feature over the western
Great Lakes over the past few days will shift east today. A
strengthening surface high ahead of modest mid-level height
rises will track from Iowa early this morning to the eastern
Great Lakes by Tuesday morning. This will promote a generally
tranquil period of weather with shallow diurnal cumulus during
the day and clear skies overnight. High temperatures up to
around 70 today will moderate closer to seasonal normals on
Monday with highs in the lower to mid 70s. Expect another
chilly night tonight with mostly calm winds and lows in the
lower 40s inland to around 50 in Chicago. However, with a rather
dry airmass still in place today, typically colder spots may
experience temps into the upper 30s.
Kluber
Monday Night through Saturday:
General trend into mid-week and beyond is for generally dry and
warmer weather conditions, though there is increasing guidance
spread toward and beyond the end of this forecast cycle next
weekend.
An expansive area of surface high pressure is forecast to be
departing the area to the east by Monday evening, though weaker
surface ridging lingers across the lower Ohio Valley through
mid-week. Aloft, ensemble guidance remains in generally good
agreement in tracking a pair of mid-level short waves through
region and loosely phasing them across the area Tuesday into
Wednesday (one tracking east from IA, another digging southeast
across the upper Midwest). In the process, low-level flow turns
more southerly across the region and increases warm/moist
advection especially along an axis from the Plains into the
upper Mississippi Valley and northern Great Lakes. Locally,
this should result in temperatures warming into the mid-upper
70s on Tuesday and into the low-mid 80s Wednesday (away from
Lake Michigan).
With the primary warm/moist advection axis west and northwest
of the forecast area, precipitation chances continue to appear
relatively low for our cwa. Latest ensemble runs continue to
only brush far northwest/northern IL with generally low (

NWS LOT Office Area Forecast Discussion