Nelvik, North Dakota Weather Forecast Discussion

223
FXUS63 KBIS 170017
AFDBIS
Area Forecast Discussion
National Weather Service Bismarck ND
717 PM CDT Tue Sep 16 2025
.KEY MESSAGES...
- Patchy fog is possible across the north early Wednesday
  morning.
- On and off showers and isolated thunderstorms remain in the
  forecast through Friday. The highest chances (40 to 60
  percent) are Thursday through Friday.
- Seasonable temperatures are expected this week, with warmer
  temperatures today and cooler temperatures to finish out the
  second half of the week.
&&
.UPDATE...
Issued at 716 PM CDT Tue Sep 16 2025
Isolated showers with an occasional thunderstorm have developed
along a broad area of low level convergence from around Williston to
Beach to Bismarck to Garrison. This activity is unlikely to persist
more than an hour or two past sunset, and strong storms are not
expected given the lack of shear. The main forecast change for this
update was to align PoPs with observed trends and blend in the
latest ensemble model guidance.
&&
.DISCUSSION...
Issued at 315 PM CDT Tue Sep 16 2025
Currently an upper level low sits over the border of Montana and
Colorado. Southwest flow is over the Dakotas, with a
thunderstorm complex in western Nebraska and southern South
Dakota. As the upper level low pressure system slides to the
east tonight, showers and thunderstorms are possible after
Midnight across the southern half of the state. Shower and
thunderstorm chances will continue through Friday as the upper
level low stalls over the Dakotas. Saturday the low pressure
system gets shoved into Minnesota by a short wave trough from
the Alberta area. Sunday surface high pressure moves in from the
southwest under a quasi-ridging pattern through mid next week.
This will mostly create dry weather. Tonight patchy fog is
possible across the north with high humidity and light winds.
Temperatures through the forecast will cool this week as the
upper level low wraps in cooler air from Canada. As a result of
this, CAPE will lower. This will likely result in a lower
chance of thunder in the otherwise likely chance of showers.
Thursday will be the lowest temperatures with widespread highs
in the upper 50s and lower 60s. Friday that cooler air slides
east ahead of the low, and temperatures warm back into the upper
60s. Thursday and Friday will be the most rainy day, especially
south and central North Dakota. Saturday when the shortwave
moves in, it brings westerly flow aloft, resulting in warm air
advection from the west. This will warm temperatures into the
70s and 80s through early next week as that quasi-ridging flow
continues.
&&
.AVIATION /00Z TAFS THROUGH 00Z THURSDAY/...
Issued at 716 PM CDT Tue Sep 16 2025
Isolated showers and perhaps a thunderstorm or two are possible this
evening. Higher chances for showers and isolated thunderstorms build
in from the south later tonight through Wednesday. VFR conditions
are likely to prevail, though reduced visibility is possible with
heavier showers or storms, and patchy fog could develop across
northern parts of the state late tonight into Wednesday morning.
There is also a potential for MVFR ceilings to develop across north
central North Dakota on Wednesday, but confidence is not yet high
enough to advertise prevailing categorical restrictions at KMOT.
Light and variable winds through tonight will become northeasterly
around 10 kts Wednesday afternoon.
&&
.BIS WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
UPDATE...Hollan
DISCUSSION...Smith
AVIATION...Hollan

NWS BIS Office Area Forecast Discussion