Clinton, Iowa 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

342
FXUS63 KDVN 042337
AFDDVN

Area Forecast Discussion
National Weather Service Quad Cities IA IL
637 PM CDT Sat Jul 4 2026

.KEY MESSAGES...

- Isolated to scattered storms can be expected through Sunday.
  Heavy rain, lightning and gusty winds are the primary risks.

- Humid conditions will continue through much of the coming
  week. There will be dry periods the first half of next week
  with mainly isolated to scattered (20-50%) coverage of storms
  the second half of next week.

- Rises are occurring on area rivers. Refer to the hydro section
  for more information.

&&

.SHORT TERM /THROUGH SUNDAY/...
Issued at 220 PM CDT Sat Jul 4 2026

A convectively induced upper level disturbance has developed new
convection mainly east of the Mississippi. This convection will grow
upscale as it moves further east through the afternoon and evening.
Some of the stronger storms will be capable of damaging winds and
possibly hail.

West of the Mississippi downward motion has temporarily suppressed
any diurnal convection but as daytime heating continues, diurnal
convection with a 10-25% coverage will develop through sunset.

The atmosphere has slightly less than 2 inches of water in it but
any storm that develops will be capable of producing heavy rainfall
and high rainfall rates.

With the risk of heavy rain and that various areas have seen heavy
rainfall over the past 48 hours, the flood watch was extended into
the evening hours and also expanded into the I-88 and I-80 corridors
of Illinois.

Once sunset occurs, most convection will dissipate. However, the
models continue to show negative theta e lapse rates through the
night. Thus isolated showers or even a thunderstorm are possible
through sunrise Sunday.

On Sunday isolated showers and some thunderstorms will be possible
through the day as theta e lapse rates remain negative. The key
message is that while there is a risk of storms, there will be many
hours of dry weather. Additionally, progged profiles indicate the
overall atmospheric moisture levels will continue to trend downward
thus lowering the overall risk of locally heavy rainfall.

&&

.LONG TERM /SUNDAY NIGHT THROUGH SATURDAY/...
Issued at 220 PM CDT Sat Jul 4 2026

Sunday night through Wednesday
Assessment..high (>80%) confidence of humid conditions continuing

The models show northwest flow developing across the CONUS which
will bring temperatures down to near normal for the first half of
July. The humid conditions will continue but not to the excessive
conditions of last week.

There will be weak disturbances moving through the flow aloft
through Wednesday. While the model consensus has dry conditions, a
rogue diurnal shower or storm during peak heating each day cannot be
ruled out.

Wednesday night through Saturday
Assessment...high (>80%) confidence of continued humid conditions.
Low (15-25%) confidence regarding rain chances.

The humid conditions will continue the second half of the week with
a potential uptick in the humidity Wednesday night into Thursday.
The various model solutions have a system passing to the north of
the area that will push a cool front through the area. While there
are some timing differences, late Wednesday night into Thursday
evening looks to be the most likely time any rain would be seen.

Not all areas will see rain but overall coverage on the rain looks
to be 30-50 percent.

Beyond Thursday evening, the model consensus has a daily risk of
rain driven by the diurnal cycle. However, overall coverage will be
low at 15-25 percent.

&&

.AVIATION /00Z TAFS THROUGH 00Z MONDAY/...
Issued at 637 PM CDT Sat Jul 4 2026

A few scattered storms around still this evening with some
additional development still possible through late evening.
Therefore maintained the mentions, but overall the greatest
chance at a terminal location looks to be currently at KDBQ
where a more developed complex of storms is moving
south/southeast from northeastern Iowa into the area. Otherwise
winds to remain mainly out of the north to northeast through the
forecast period with mainly high clouds into Sunday, and some
light fog potential into Sunday morning.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...Flood Watch until 10 PM CDT this evening for IAZ040>042-
     051>054-063>068-076>078-087>089.
IL...Flood Watch until 10 PM CDT this evening for ILZ009-015>018-
     024.
MO...None.

&&

$$

SHORT TERM...08
LONG TERM...08
AVIATION...MJB