450 FXUS63 KBIS 061401 AFDBISArea Forecast Discussion National Weather Service Bismarck ND 901 AM CDT Sat Sep 6 2025
.KEY MESSAGES...
- Areas of frost throughout North Dakota late tonight into early Sunday morning.
- Dry until the middle of next week, then precipitation chances return.
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.UPDATE... Issued at 854 AM CDT Sat Sep 6 2025
We have expired the Freeze Warning and Frost Advisory. Temperatures dropped into the upper and even mid 20s over a number of locations in western and central ND early this morning. For today, look for sunny skies west, but with partly to mostly cloudy skies central and into eastern ND. Winds are not expected to be too strong and highs will climb into the upper 50s to mid 60s. Overall, not too bad of a day. We will see another cool morning Sunday, but not as cold as this morning.
UPDATE Issued at 637 AM CDT Sat Sep 6 2025
Cold temperatures continue over the area, with the coldest temperatures over western North Dakota where many locations dipped to or below freezing. So far the coldest reports have been at NDAWN stations near Tioga and near New Hradec where the temperature dipped down to 26. Otherwise, some clouds continue to move through north central North Dakota sliding to the southeast.
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.DISCUSSION... Issued at 153 AM CDT Sat Sep 6 2025
Current surface analysis places deep low centered over James Bay, while high pressure stretches through Saskatchewan into the western Dakotas. Upper level analysis places low over eastern Ontario, with cyclonic flow stretching back into the Northern Plains. Over our area, some clouds continue to slide through central North Dakota on the back side of the cyclonic flow. Otherwise, a quiet and chilly night continues, especially over western North Dakota where lows have dipped into the upper 20s to lower 30s in many locations, with the coldest readings of 29 degrees so far being reported at NDAWN stations near Amidon and Tioga.
For today, cyclonic flow aloft may keep a few clouds over eastern portions of the area, but this will come to an end later today into this evening as ridge over the western CONUS starts its gradual push east. Otherwise, a quiet but cool day is on tap with highs mainly in the upper 50s to mid 60s, which will be about 15 degrees below average. The good part will be the winds should be quite light with the surface high over the region.
For tonight, surface high broadens out and spreads east with very light if any wind expected. This will combine with the clear skies to produce another cold night with areas of frost.
On Monday into Tuesday, upper ridge pushes east resulting in a warming trend. Our pattern becomes more active for the middle and end of the week as an upper low closes off over the Great Basin region and tries to eject some waves up the back side of the ridge before it lifts towards the northeast, bringing precipitation chances to our area.
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.AVIATION /12Z TAFS THROUGH 12Z SUNDAY/... Issued at 637 AM CDT Sat Sep 6 2025
VFR conditions will prevail through the forecast period.
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.BIS WATCHES/WARNINGS/ADVISORIES... None.
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UPDATE...JJS DISCUSSION...JJS AVIATION...JJS
NWS BIS Office Area Forecast Discussion