textproduct: Sioux Falls

KEY MESSAGES

- Additional snow and continued strong winds lead to reduced visibility, a quarter mile or less through the overnight hours across southwestern MN and northwestern IA due to falling and blowing snow. Toward I-29, visibility may drop below a mile.

- Northwest winds will gust to 45 mph tonight gradually taper off through Monday.

- Much colder air will accompany these strong winds, leading to wind chill values of 10 below to 20 below zero into Monday morning.

- After tonight, the probability of impactful systems will be low over the next several days.

DISCUSSION

Issued at 205 PM CST Sun Dec 28 2025

A potent upper level low continues to deepen and rotate southeast, leaving the area with windy conditions into Monday. As this low wraps up, warming aloft pushes temperatures from below the DGZ back into the DGZ and should bring another round of snow to area mainly north of I-90 west of I-29 and south into parts of northwest IA near and east of I-29 this evening. With roughly 1-4 inches of fresh, powdery snow in place and wind gusts continuing at 45 to 55 mph, reduced visibilities will continue into the night, and likely be 1/4 mile or less at times in parts of southwest MN and northwest IA where the higher snowfall amounts are. A brief improvement in visibility is likely this afternoon before coming back down after sunset with this wrap around, thus the blizzard warning will remain in place during this time through 12z Monday morning. The advisory to the west and south of the blizzard warning will be a little more questionable as snow this evening will be lighter or possibly not occur at all, so we will monitor to see if visibilities improve later this afternoon to determine the extent of the advisory in time and areal coverage.

Northwest flow aloft will bring generally dry conditions to the area through the week. Once exception may be Wednesday when a weak wave moves quickly by. For now impacts appear limited with the better chance for a little light snow north of I-90. Will need to keep an eye on the warm layer aloft as a brief period of mixed precipitation may become possible. Otherwise temperatures will be near or below normal through the period.

AVIATION /06Z TAFS THROUGH 06Z TUESDAY/

Issued at 1042 PM CST Sun Dec 28 2025

Snow continues to pivot south/southeast tonight into early Monday, lingering the longest across southwestern MN and northwestern IA. Heaviest accumulations will be in this area. Expect IFR to LIFR visibility and MVFR/IFR stratus with falling snow.

Strong northwesterly winds continue to gust around 40 knots into tonight, slowly tapering down Monday morning into the early afternoon. Expect gusts still around 30 knots east of I-29 into the afternoon. These winds, combined with new and falling snow, will lead to reduced visibility. Outside of falling snow, should see lower end VFR to MVFR visibility, with some IFR blowing snow overnight for areas east of I-29.

MVFR stratus should lift through the morning hours. As winds and blowing snow taper down, VFR conditions by/during Monday afternoon.

FSD WATCHES/WARNINGS/ADVISORIES

SD...Winter Weather Advisory until 6 AM CST Monday for SDZ040-055- 056-061-062-066-067-069>071. Wind Advisory until midnight CST tonight for SDZ040-055-056- 061-062-066-067-069>071. MN...Winter Weather Advisory until 6 AM CST Monday for MNZ098. Wind Advisory until midnight CST tonight for MNZ071-072-080- 081-089-090-097-098. Blizzard Warning until 6 AM CST Monday for MNZ071-072-080-081- 089-090-097. IA...Winter Weather Advisory until 6 AM CST Monday for IAZ001-012- 020>022-031-032. Wind Advisory until midnight CST tonight for IAZ001>003- 012>014-020>022-031-032. Blizzard Warning until 6 AM CST Monday for IAZ002-003-013-014. NE...Winter Weather Advisory until 6 AM CST Monday for NEZ013-014. Wind Advisory until midnight CST tonight for NEZ013-014.