Ottumwa Junction Iowa Weather Forecast Discussion

200
FXUS63 KDMX 071755
AFDDMX
Area Forecast Discussion
National Weather Service Des Moines IA
1255 PM CDT Tue Oct 7 2025
.KEY MESSAGES...
- Cool tonight with a chance for some patchy frost in northern
  Iowa.
- Dry with seasonal temperatures the rest of today into
  tomorrow.
- Winds pick up again Thursday with a slight chance (15-25%)
  for rain.
&&
.DISCUSSION...
Issued at 1255 PM CDT Tue Oct 7 2025
Today and Tomorrow... High surface pressure and northwest flow
aloft will advect additional cool air in overnight. With the
high pressure little pressure gradient and therefore light
winds and clear skies. All of this will create a good setup for
radiational cooling tonight. This could result in some frost in
parts of northern Iowa where the coolest temperatures are
expected. The general pattern will hold into tomorrow with a
very similar day expected. Tomorrow night though, the focus of
the coolest air should shift east to eastern Iowa.
Thursday into the Weekend... A change in the pattern arrives on
Thursday with a shortwave moving through. This will provide
enough synoptic forcing and a chance of some rain showers.
Model forecast profiles do not look favorable for instability
and this matches the SPC day 3 outlook with no general thunder
over Iowa. Warmer air moves back in Friday into the weekend with
highs back in the lower 80s once again possible. The low all
these air masses is associated with will also have frontal
passages associated with it. Along these fronts will be our next
chances for rain and gusty winds. Still a fair amount of spread
within global ensemble guidance (as expected). So will be
keeping an eye for future updates on where this trends to hone
in on forecast rainfall timing and amounts.
&&
.AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 1255 PM CDT Tue Oct 7 2025
Clear to mostly clear VFR skies through the period. Northerly
winds will continue through the day today at around 10 knots
with some occasional gusts up to around 20 knots. Winds will
become light and variable tonight into tomorrow morning.
Looking ahead to tomorrow afternoon winds stay light, but from
a southeast to east direction with continued VFR.
&&
.DMX WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION...NC
AVIATION...NC

NWS DMX Office Area Forecast Discussion