Mandaree, North Dakota Weather Forecast Discussion

817
FXUS63 KBIS 211058
AFDBIS
Area Forecast Discussion
National Weather Service Bismarck ND
558 AM CDT Sun Sep 21 2025
.KEY MESSAGES...
- Areas of fog this morning mainly from the James River Valley
  into the Turtle Mountains.
- High temperatures will be mostly in the 70s this week, with
  occasional readings in the low 80s, including in western ND
  this afternoon.
&&
.UPDATE...
Issued at 558 AM CDT Sun Sep 21 2025
Issued an SPS until 10 am CDT for Rolette, Pierce, and Wells
counties for areas of fog with patchy dense fog. This matches
up with counties to the east that are also in an SPS. Otherwise,
the forecast remains on track.
&&
.DISCUSSION...
Issued at 342 AM CDT Sun Sep 21 2025
Areas of fog have developed early this morning mainly from the
James River Valley (mostly along and north of I94) into the
Turtle Mountains. A few obs are reporting dense fog, though
overall, dense fog seems localized. For example, while the
Jamestown airport has been reporting quarter mile visibility off
and on, webcams along the interstate show fog that is patchy in
nature and possibly shallow. Either way, will continue to
monitor this morning for more widespread deterioration in
visibility. Fog should dissipate by mid to late morning.
All in all, there really isn`t a whole lot to talk about for
this week. Generally dry conditions are expected, while
temperatures are forecast to be a bit above average overall
with highs mostly in the 70s to low 80s. Going along those lines,
highs this afternoon should be mostly in the 70s. However,
western ND is forecast to reach the low 80s as it will be under
the influence of a thermal ridge and southerly surface flow. For
Monday, the pressure gradient will tighten in western ND from
low pressure over southern Canada and high pressure over western
Montana. This should produce breezy conditions for western
parts of the state during the afternoon hours. Otherwise,
expect mostly light winds through the week.
&&
.AVIATION /12Z TAFS THROUGH 12Z MONDAY/...
Issued at 558 AM CDT Sun Sep 21 2025
Areas of fog, along with patchy dense fog, are present in north
central ND. KJMS has also been reporting 1/4 to 1SM of fog most
of the night. However, webcams a couple miles south of the
terminal on I94 have only shown limited patchy fog that appears
mostly shallow in nature. With a lack of ground truth at the
terminal, been using BCFG to address this discrepancy in the
TAFs. Once any fog clears out later this morning, and barring
fog development again tonight (it`s possible, but signals aren`t
the strongest), VFR ceilings and visibility are expected
through the remainder of the period.
&&
.BIS WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
UPDATE...Telken
DISCUSSION...Telken
AVIATION...Telken

NWS BIS Office Area Forecast Discussion