Napoleon, North Dakota Weather Forecast Discussion

525
FXUS63 KBIS 201925
AFDBIS
Area Forecast Discussion
National Weather Service Bismarck ND
225 PM CDT Sat Sep 20 2025
.KEY MESSAGES...
- Patchy to areas of fog return early Sunday morning.
- Temperatures warm back into the 70s and low 80s through the
  weekend, then remain mostly in the 70s next week.
- Quiet weather through most of the forecast period.
&&
.DISCUSSION...
Issued at 225 PM CDT Sat Sep 20 2025
Currently the stacked low that gave North Dakota all the rain
this week, is now sitting over southwestern Wisconsin. The other
low that was mentioned yesterday is sitting over the North
Dakota and Canadian Border. This low however does not translate
to the surface. At the surface, a high pressure sits in that
same spot. At the mid-levels the western CONUS is a weak ridge
the extends to western North Dakota where the backside of that
upper level low sits. Clouds across the state continue to erode
as the surface low moves east away from the Northern Plains, and
the surface high exist in the state.
Tonight, with that surface high, calm winds and clear skis will
lead to another morning of patchy to areas of fog. Sunday will
be the warmest day of the forecast period as a shortwave ridge
will be influencing the state. The far west will likely see
highs in the low 80s. Away from the thermal ridge, in the east,
temperatures will warm into the low 70s.
Monday another low could influence North Dakota as it dives
south from Canada into Montana. The CAMs and the NBM have been
taming down the rain chances however the last 36 hours. The
actual low itself will miss the Dakotas, but far southwest North
Dakota will be in positive vorticity for a few hours, so a few
showers could form. The rest of the week looks to be in a Omega
blocking pattern that slowly moves east. So temperatures will
remain in the 70s without any rain chances.
&&
.AVIATION /18Z TAFS THROUGH 18Z SUNDAY/...
Issued at 1220 PM CDT Sat Sep 20 2025
VFR west to MVFR east. Clouds will clear from west to east
through the forecast period. MVFR CIGs will remain in the east
this afternoon before lifting and breaking up later in the day.
Winds will be light and variable before staying from the
southeast at 10kts Sunday afternoon.
&&
.BIS WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION...Smith
AVIATION...Smith

NWS BIS Office Area Forecast Discussion