Here is the word from the National Weather Service in Sioux Falls:

...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST
TONIGHT...

* WIND...NORTHWEST WINDS OF 15 TO 25 MPH WILL DECREASE TO 10 TO 20
MPH BY AFTERNOON AND THEN CONTINUE TO DIMINISH TONIGHT.

* WIND CHILL VALUES...WIND CHILL VALUES OF 20 BELOW TO 35 BELOW
ZERO ARE EXPECTED THROUGH THIS EVENING WITH THE COLDEST WIND
CHILLS THIS MORNING.

Today- Mostly sunny, with a high near 2. Wind chill values as low as -30. Northwest wind 10 to 15 mph.

Tonight- Partly cloudy, with a low around -7. Wind chill values as low as -21. Northwest wind 5 to 10 mph becoming light north northwest after midnight.

Tuesday- A chance of snow. Cloudy, with a high near 13. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 50%.

Tuesday Night- Cloudy, then gradually becoming partly cloudy, with a low around 5. Southeast wind around 5 mph becoming calm.

Wednesday- Mostly sunny, with a high near 18. Light north northwest wind becoming north 5 to 10 mph in the morning.

Stay Warm!