North Riverside, Illinois Weather Forecast Discussion

104
FXUS63 KLOT 261759
AFDLOT
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1259 PM CDT Fri Sep 26 2025
.KEY MESSAGES...
-  Dry and unseasonably warm daytime conditions through next
   week will lead to worsening drought.
&&
.DISCUSSION...
Issued at 1259 PM CDT Fri Sep 26 2025
Through Next Friday:
There`s virtually no impactful weather in store for the next week
plus, along with unseasonable/summer-like daytime warmth (80s
inland of lake cooling). An omega block will set up between
troughing over the Pacific NW and likely tropical cyclone Imelda
stalling near or over the southeast US and Humberto stalling a bit
farther offshore. At the surface, primarily west-southwest flow
inland of the lake through Saturday will transition to east-
northeast flow Sunday onward as expansive high pressure
establishes over northeastern North America. A weak cold front
Saturday night will take on back door characteristics into Sunday
and then largely wash out. Lake breeze enhancement to synoptic
onshore flow will enable the lake cooling footprint to spread
relatively far inland each day. Anticipate fairly large diurnal
temperature ranges, especially outside of Chicago, as dew points
mix out and support efficient nighttime radiational cooling.
An additional minor item of note overnight tonight into early
Saturday is the potential for patchy shallow ground fog (amidst
any otherwise modest visibility reductions) away from Chicago.
Went closer to MOS guidance for forecast lows (low-mid 50s outside
of the city), which will probably be near to a bit below this
afternoon`s crossover temps, supporting patchy fog development.
However, the very dry profile aloft will likely preclude anything
than more than highly localized dense fog near/over fields and
inland water bodies. Therefore, we`re not planning to message a
limited risk for impactful dense fog in the afternoon HWO.
Castro
&&
.AVIATION /18Z TAFS THROUGH 00Z SUNDAY/...
Issued at 1250 PM CDT Fri Sep 26 2025
There are no significant aviation forecast concerns for the
current TAF period.
A weak frontal boundary sagging southward from southeast
Wisconsin will likely wash out before reaching ORD and RFD this
evening. Some patchy shallow fog may develop near the
stalled/washed out front overnight tonight. Out of our five TAF
sites, RFD stands the best chance to see visibility reductions
from this tonight into early tomorrow morning. That said, the
odds of mist/fog being observed at RFD (or anywhere else) still
appear to be too low to warrant the introduction of any sort of
visibility reductions in the TAFs at this time. VFR conditions
are otherwise expected to prevail through the TAF period.
West-southwesterly winds are expected again during the daytime
tomorrow and should be a touch higher, on average, compared to
today.
Ogorek
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.
&&
$$
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NWS LOT Office Area Forecast Discussion