855 FXUS63 KBIS 271421 AFDBISArea Forecast Discussion National Weather Service Bismarck ND 921 AM CDT Sat Sep 27 2025
.KEY MESSAGES...
- Above average temperatures and occasionally breezy conditions continue through the middle of next week.
- Mostly dry conditions this weekend and into the beginning of next week. Low rain chances return for the latter half of next week.
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.UPDATE... Issued at 921 AM CDT Sat Sep 27 2025
Quiet morning weather-wise. Forecast remains on track for the day.
UPDATE Issued at 621 AM CDT Sat Sep 27 2025
Clear skies and light winds have allowed temperatures to drop a bit more than forecast, especially in the traditionally cooler spots. This means some locations have dipped into the mid 30s. Temperatures will rapidly rebound today as the sun rises. Otherwise, the forecast remains on track.
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.DISCUSSION... Issued at 341 AM CDT Sat Sep 27 2025
Warm, occasionally breezy, and mostly dry conditions are expected to continue for this weekend and into the middle of next week. For this afternoon, breezy conditions are likely for parts of the area as surface high pressure moves across South Dakota, and the western/northern portions of the state remain on the gradient. Southerly surface winds will help maintain high temperatures that, while cooler than previous days, are still seasonably warm and mostly in the 70s with a few 80 degree readings possible. Otherwise, expect mostly sunny skies with some elevated smoke that may lead to at least partially milky skies at times.
For Sunday, breezy conditions are possible again, though this time more so in south central and eastern ND, as aforementioned surface high gradually migrates eastwards. Continued southerly flow at the surface and an amplifying ridge will lead to well above average temperatures in the 80s. As the ridge continues amplifying before finally reaching a peak amplitude over the Great Lakes region by Wednesday, well above average temperatures (upper 70s to mid 80s) will continue through the first half of next week. In addition, occasionally breezy conditions are expected during this timeframe as surface high migrates from south central Canada towards the Great Lakes Region, and surface low simultaneously sets up over the High Plains and gradually propagates northward into south central Canada.
Models have generally backed off low precipitation chances to start the workweek and pushed them more into the middle and especially end of next week. And even then, chances remain relatively low through Thursday as weak shortwave energy rides the western periphery before breaking down the ridge. At this point, what may be most interesting is just outside the traditional 7 day forecast range. The past few runs of both the EC and GFS, and to a lesser extent the latest Canadian, have indicated a potential warm season (snowless) Colorado Low developing and coming through the region. While it`s too early to know details, or if the system will even occur, it definitely falls into the "interesting" category. Regardless of precipitation potential, confidence is increasing in a cooling trend if nothing else that may bring temperatures back down to more seasonable levels.
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.AVIATION /12Z TAFS THROUGH 12Z SUNDAY/... Issued at 621 AM CDT Sat Sep 27 2025
VFR ceilings and visibility are expected through the period.
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.BIS WATCHES/WARNINGS/ADVISORIES... None.
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UPDATE...Smith DISCUSSION...Telken AVIATION...Telken
NWS BIS Office Area Forecast Discussion