Jamestown, North Dakota 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

852
FXUS63 KBIS 041756
AFDBIS

Area Forecast Discussion
National Weather Service Bismarck ND
1256 PM CDT Mon May 4 2026

.KEY MESSAGES...

- Near critical fire weather conditions today.

- Isolated showers this afternoon.

- Cooler today and Tuesday, followed by a gradual warm-up
  through the rest of the week.

&&

.UPDATE...
Issued at 1256 PM CDT Mon May 4 2026

Low to mid-level stratocu is present across most of the forecast
area. There are some cracks in the sky cover, though it`s
looking less and less likely that any substantial sun will break
through for most areas. With northwesterly winds and lack of
sun, decreased high temperatures a bit across the forecast area.
While this will result in slightly higher minimum relative
humidity values, maintaining near critical fire weather
condition mentions due to gusty winds and still dry conditions.

UPDATE
Issued at 859 AM CDT Mon May 4 2026

The strongest winds associated with a passing cold frontal
boundary have ended across the forecast area for now, and most
sustained winds are currently 15 to 25 mph with gusts up to 35
mph. The Bismarck airport ASOS did report a brief gust of 45
mph the last hour. However, none of surrounding observations
picked up on it so it must have been fairly localized. Still
expect winds to pick up this afternoon with sustained winds of
20 to 30 mph and gusts up to 45 mph possible. However, with the
best pressure rises and strongest CAA having already passed
through, thick low-level stratus advecting south, and a pressure
gradient that should weaken to some degree; confidence is only
medium in regard to winds reaching their peak potential this
afternoon.

UPDATE
Issued at 635 AM CDT Mon May 4 2026

Most of the rain on radar in the southwest does not seem to be
reaching the ground yet. Relative humidity is only around 45
percent and cloud bases are at 8000 feet. The forecast is still
on track for today.

&&

.DISCUSSION...
Issued at 240 AM CDT Mon May 4 2026

Northwest flow continues across the Northern Plains and Upper
Mississippi River Valley from a low pressure system in southern
Canada. There are two cold fronts extending off this low
pressure, one that has already move through the state, and
another currently in central North Dakota. The first front
gusted winds to 50 MPH for a short period, the second has light
rain along the front. Slight chances for rain was added to the
current NBM forecast. The second front is also creating gusty
winds, but only to around 30 MPH.

Today will be cooler, but still breezy. Expect highs in the
post frontal air to be in the mid 40s north to mid 50s far
south. Winds will be from the northwest, gusting near 30 MPH.
Winds will be very close to Advisory criteria, especially in the
southwest. Some models have strong winds gusting near 50 MPH,
and others don`t. Confidence is lower, especially with the cold
front passage happening now, along with the high pressure
bubble. We will wait and see if the winds do end up stronger
than forecast. There is still some fire weather danger today
with the winds and afternoon humidities dropping to 30 percent.
So we will maintain the near-critical wording, pay attention to
your local burn restrictions. Under the cyclonic flow from the
low pressure system, scattered isolated showers are possible
this afternoon. With this, we covered our area in a broad slight
chance (20%) through the afternoon.

The rest of this week we will remain in the northwest flow as a
ridge builds in the western CONUS. This ridge will slowly force
the northwest flow and cooler air to shift east. This in turn
will warm our surface temperatures. By this weekend we will be
back above normal temperatures with highs possibly in the mid
and upper 60s.

&&

.AVIATION /18Z TAFS THROUGH 18Z TUESDAY/...
Issued at 1256 PM CDT Mon May 4 2026

Gusty northwesterly winds will continue through the day today
before rapidly becoming light this evening. Light winds will
remain northwesterly overnight before becoming breezy again
later Tuesday morning. Isolated showers, mostly as rain, but
perhaps with a little light snow mixed in, are possible this
afternoon and evening. For the most part, ceilings should
remain low VFR this afternoon, though can`t rule out pockets of
MVFR ceilings. Especially should any light rain or snow occur.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

UPDATE...Telken
DISCUSSION...Smith
AVIATION...Telken