11/24 Forecast Discussion: Dangerous travel across much of the region
Treacherous travel expected; winter storm warnings expanded
Befoer you head out and about, call 511 for updated road conditions. See live road conditions here: www.safetravelusa.com/sd/
TODAY: As a winter storm spins up to the southwest of our region, snow and mixed precipitation will spread into the region, mostly along I-90 and south. Temperatures, especially across the plains will be marginal for snow, especially in the morning and midday. Highs southeast of the Black Hills will reach the mid- to upper 30s, allowing some rain to mix with snow, which will affect snowfall totals. Temperatures will fall in the afternoon, allowing all precipitation to change to snow and wet roads to become icy. Travel is not recommended today and tonight!
Because of the marginal temperatures, models are struggling to determine how much rain will mix with the snow.
Everyone should change over to snow by mid-afternoon. Winds will also increase to 15-25 mph, gusting to 45 mph, which could cause blowing snow and very poor visibility.
TONIGHT: Snow will continue through the first half of the evening, again mostly along I-90 and south. Snow accumulations, especially on the plains, will be highly dependent on how much rain mixes with the snow. However, 3 to 6 inches is likely. With a northeasterly flow, upslope forcing could cause locations like Sturgis and Spearfish to see accumulations in the 4 to 6 inch range. Communities north of I-90 are likely to see one inch or less.
The snow will end by daybreak, but we will wake up to temperatures only in the teens.
SUNDAY: Skies will clear throughout the day, with just a few clouds mixing with the sun. The bigger story will be chilly temps, highs will only reach the mid-30s because of northwest winds courtesy of high pressure from the central Rockies. Not as windy as today.
SUNDAY NIGHT: Quiet, but cold, with overnight lows falling into the mid teens.
MONDAY AND BEYOND: Expect a chilly start to the work week, with highs remaining only in the 30s Monday and Tuesday. Another round of winter weather may affect the region Wednesday into Thursday.