West Des Moines, Iowa 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

445
FXUS63 KDMX 110350
AFDDMX

Area Forecast Discussion
National Weather Service Des Moines IA
1050 PM CDT Sun Aug 10 2025

 ...Updated for the 06z Aviation Discussion...

.KEY MESSAGES...

- Showers and storms ending by this evening. A few funnel clouds
  remain possible during the diurnal period though the threat
  for tornadoes is low.

- A few storms possible again Monday, mainly south otherwise a
  transition to drier weather the remainder of the week.

&&

.DISCUSSION...
Issued at 237 PM CDT Sun Aug 10 2025

Weak surface boundary, which is still somewhat non-descript from the
morning convection disruption, is extending from near to Decorah and
through the Des Moines metro and the to the southeast of
Omaha/Council Bluffs. A remnant MCV is also moving into central Iowa
from the overnight convection and the combination of the MCV and the
boundary have led to conditions favorable for a few funnel clouds
associated new updrafts with near surface vorticity, light winds and
sufficient 0-3 km CAPE for stretch the vorticity vertically. The
potential for actual tornadoes to occur is low. We have a Special
Weather Statement out for funnel potential. Otherwise, the threat
for heavy rainfall that could produce flash flooding has diminished
therefore, the Flash Flood Watch has been cancelled.

The showers and storms will gradually move off the east and south
this evening and overnight and will lead to a mostly dry period. A
few showers and storms are possible on Monday, especially south as
weak instability lingers. There is a window for more funnel
potential in the afternoon similar to today, over southern Iowa.
Iowa will be in the long wave trough Monday night and transition to
northwest flow Tuesday. This will lead to drier conditions but also
will bring the potential for more wildfire smoke to move over the
state, especially over northern Iowa. The northwest flow will begin
to relax and transition to zonal flow on Wednesday then 500 mb
height rises occur for the end of the week as sub-tropical high
pressure becomes re-established into Gulf Coast region. It is
possible northern Iowa gets caught in the ring of fire MCS tracks
late in the week and into the weekend. Otherwise, typical summer
weather with highs in the mid 80s to low 90s and humid.

&&

.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/...
Issued at 1050 PM CDT Sun Aug 10 2025

Main aviation concerns remain on fog and stratus that will
impact terminals in the next 9 hours or so. The fog is forecast
to begin developing shortly after midnight tonight over eastern
into portions of central Iowa before dissipating about two hours
after sunrise. Visibility restrictions of MVFR/IFR are forecast.
DSM and OTM have been flipping back and forth in whether fog
will reach them or not and have held with a persistence forecast
for those sites given the uncertainty. Then, low ceilings may
develop. Coverage of MVFR ceilings is less than previous
forecast so there is less mention in this cycle. Any ceiling
restrictions will improve through the morning with VFR then
through the end of the period. Light winds will prevail through
the period and have put in prevailing direction vs
VRB03KT/00000KT in most cases.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION...Donavon
AVIATION...Ansorge