The following details are courtesy of the National Weather Service:

 

A STRONG STORM SYSTEM WILL CROSS THE REGION TODAY THROUGH FRIDAY MORNING…BRINGING ACCUMULATING SNOW TO THE AREA. SNOW WILL
DEVELOP ACROSS NORTHEAST WYOMING AND SPREAD EAST ACROSS WESTERN SOUTH DAKOTA THROUGH THE DAY. PRECIPITATION WILL LIKELY START AS RAIN OR A RAIN AND SNOW MIX OVER PARTS OF THE SOUTH DAKOTA PLAINS
TODAY…TRANSITIONING QUICKLY TO ALL SNOW BY THIS EVENING…WITH ALL SNOW EXPECTED IN THE BLACK HILLS.
SNOWFALL TOTALS OVER MUCH OF THE AREA ARE EXPECTED TO BE IN THE 3 TO 6 INCH RANGE…WITH 5 TO 12 INCH AMOUNTS OVER MUCH OF THE NORTHERN BLACK HILLS. FAR NORTHWEST SOUTH DAKOTA WILL SEE THE LEAST SNOWFALL…MOSTLY IN THE 1 TO 3 INCH RANGE. IN ADDITION… NORTHWEST WINDS OF 15 TO 30 MPH WITH GUSTS TO 40 MPH ARE FORECAST
OVER PORTIONS OF WESTERN AND SOUTH CENTRAL SOUTH DAKOTA LATER THIS AFTERNOON…WHICH WOULD SUPPORT SOME AREAS OF BLOWING AND
DRIFTING SNOW THROUGH TONIGHT.

SDZ046-047-049-172315-
/O.UPG.KUNR.WS.A.0004.161117T2100Z-161118T1800Z/
/O.EXB.KUNR.WS.W.0004.161118T0000Z-161118T1800Z/
MELLETTE-TODD-TRIPP-
INCLUDING THE CITIES OF…WHITE RIVER…MISSION…WINNER
416 AM CST THU NOV 17 2016

…WINTER STORM WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON
CST FRIDAY…

THE NATIONAL WEATHER SERVICE IN RAPID CITY HAS ISSUED A WINTER
STORM WARNING FOR SNOW AND BLOWING SNOW…WHICH IS IN EFFECT FROM
6 PM THIS EVENING TO NOON CST FRIDAY. THE WINTER STORM WATCH IS NO
LONGER IN EFFECT.

* SNOW IS LIKELY FROM EARLY THIS EVENING THROUGH EARLY FRIDAY
MORNING.

* TOTAL SNOW ACCUMULATIONS OF 3 TO 6 INCHES WITH LOCALLY HIGHER
AMOUNTS EXPECTED.

* NORTH WINDS OF 15 TO 30 MPH WITH GUSTS TO 40 MPH WOULD LEAD TO
BLOWING AND DRIFTING SNOW.

* SIGNIFICANT REDUCTIONS IN VISIBILITY ARE POSSIBLE.

* PLAN ON DIFFICULT DRIVING CONDITIONS…ESPECIALLY TONIGHT AND
FRIDAY MORNING.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A WINTER STORM WARNING MEANS HEAVY SNOW…STRONG WINDS…FREEZING
PRECIPITATION…AND COLD TEMPERATURES WILL CREATE DANGEROUS
CONDITIONS.