879
FXUS63 KDVN 212338
AFDDVN

Area Forecast Discussion
National Weather Service Quad Cities IA IL
638 PM CDT Tue Jul 21 2026

.KEY MESSAGES...

- Cooler and less humidity this week, with heat returning this
  weekend with mainly dry conditions through the weekend.

&&

.SHORT TERM /THROUGH TONIGHT/...
Issued at 312 PM CDT Tue Jul 21 2026

Northwest flow aloft and high pressure building into the area.
Skies should clear overnight with drier and cooler air moving
into the forecast area. This should result in low temperatures
tonight into the mid 50s to lower 60s and winds shifting around
to the north to northeast.

&&

.LONG TERM /WEDNESDAY THROUGH MONDAY/...
Issued at 312 PM CDT Tue Jul 21 2026

A northwest flow pattern remains in place through much of the
period with a broad flat ridge building through the
intermountain west through late week. The ridge begins to build
slightly further east into the central US into the weekend. A
weak shortwave will drop southeastward through the area late
Thursday and bring a chance for some showers and thunderstorms,
with mainly dry conditions otherwise across the area.

Much cooler air aloft will keep temperatures cooler and below
the seasonal averages through the end of the week. Thermal
ridging builds eastward into the area with H85 temperatures
increasing back into the mid to upper 20s Celsius by this
weekend with the heat returning to the area. Southerly flow off
the Gulf returns by late Sunday into early next week should
allow the humidity to return as well.

&&

.AVIATION /00Z TAFS THROUGH 00Z THURSDAY/...
Issued at 629 PM CDT Tue Jul 21 2026

Gusty northwest winds will come to an end by 01 UTC as the
atmosphere decouples and high pressure slowly builds into the
area. Winds will be northerly around 5 knots overnight before
turning to the northwest after 15 UTC Wednesday with speeds of 5
to 10 knots. Conditions are forecast to remain VFR through the
period. Diurnal cumulus will redevelop after 15 UTC and continue
through the reminder of the period.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...None.
IL...None.
MO...None.

&&

$$

SHORT TERM...MJB
LONG TERM...MJB
AVIATION...Cousins