424 FXUS63 KBIS 061455 AFDBISArea Forecast Discussion National Weather Service Bismarck ND 955 AM CDT Mon Oct 6 2025
.KEY MESSAGES...
- Freezing temperatures are possible again tonight across western and northern parts of the state.
- Dry with below average temperatures continue for the first half of the week, with highs mostly in the 50s. A slight warm- up with highs in the 60s and 70s is then anticipated to close out the week.
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.UPDATE... Issued at 955 AM CDT Mon Oct 6 2025
Calm and clear conditions are found across western and central North Dakota this morning. With the sunrise, temperatures have begun to rapidly climb to above freezing across the forecast area. Thus, the Freeze Warning will be allowed to expire on time at 10 AM CDT / 9 AM MDT. Have made some slight adjustments to the cloud cover along the ND/SD state line this morning, but otherwise the forecast remain on track at this time.
UPDATE Issued at 621 AM CDT Mon Oct 6 2025
Temperatures continue to drop below freezing across most of the area. The latest surface observations and NBM wind data was loaded into the going forecast.
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.DISCUSSION... Issued at 305 AM CDT Mon Oct 6 2025
Currently there is quasi-zonal flow across North Dakota at the bottom of a large trough. Moving on shore in the Pacific Northwest, is a large ridge. At the surface a strong high pressure center, located in eastern Montana, is influencing the Northern Plains. Temperatures are currently falling into the 20s across the state as the surface high pressure is calming winds and not allowing a blanket of clouds to keep in the radiational heating. The lowest temperatures are occurring in far northwestern North Dakota, but freezing temperatures are possible across the state. For western and central North Dakota, a Freezing Warning is on going. In the eastern third of the state a Freeze Advisory is ongoing.
Today through Friday multiple surface high pressures will slide through the Northern Plains. Aloft, northwest flow will be dominate until Wednesday when a small ridge moves across. This will allow Wednesday to be the warmest day of the work week as slightly warmer 850mb temperatures move in. Wednesday will also be quite breezy in the central and east. A tight surface pressure gradient will create south winds to gust around 35mph. Temperatures will generally remain around the 60s through Friday. Friday night the pattern aloft changes to southwest flow, as a strong low and digging trough exist in the western CONUS. Next weekend as a result could be rainy again. The current NBM run has slight chances (20%) of rain through Monday. Temperatures this weekend could be warmer too, looking at highs possibly in the 70s and lower 80s.
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.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/... Issued at 955 AM CDT Mon Oct 6 2025
VFR CIGs and VIS through the period. Winds will gust near 30kts from the west this afternoon, before calming again at sunset.
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.BIS WATCHES/WARNINGS/ADVISORIES... None.
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UPDATE...Adam/Smith DISCUSSION...Smith AVIATION...Smith
NWS BIS Office Area Forecast Discussion