12/1 Forecast Update (5 p.m.): Slippery roads expected tonight

Snow accumulations uncertain; a cold week lays ahead

5 PM UPDATE: Snow is continuing to fall across much of the region, especially in the Black Hills, along Interstate 90 and south of I-90. Snow will end from northeast to southwest during the evening…ending in Rapid City sometime around midnight. Roads are wet, or covered with slush, and temperatures are starting to fall below freezing. Roads will be very slippery this evening and tomorrow morning.

The latest run of the most optimistic model -NAM (United States) has up to 3.4″ of additional snow for Rapid City.

1 PM UPDATE: All winter weather advisories have been canceled for Ziebach County. The Winter Storm Warning for Haakon has been downgraded to a Winter Weather Advisory due to lower than expected snowfall totals because of some drier air.

 

The storm is centered just northeast of Kansas City.

TODAY: Things are frustrating as the National Weather Service radar unit is out-of-service for important maintenance work. However, light to moderate snow showers have overspread much of the region. Roads will be slippery, especially on bridges and overpasses as temperatures will climb to within a few degrees of 32 degrees Fahrenheit. Good news is that winds will be out of the north at 10-15 mph, so blowing snow is not very likely. Model guidance has been reducing the amount of expected snowfall, due to some drier air slipping into the region from North Dakota, as well as the marginal temperatures. Accumulation in Rapid City should be in the 4 inch to 7 inch range, with lesser amounts northeast, and higher amounts southeast. Some Black Hills locations may also see more than 8 inches. Looking forward to the next model guidance this afternoon.

The latest GFS (United States) model shows lower snowfall totals than last night.

TONIGHT: Roads will become slippery as temperatures fall below freezing…overnight lows will get down into the low 20s. Snow will end from northeast to southwest. Some locations may see another 1 inch to 2 inches of snow before the storm is over.

TOMORROW: Cloudy and cold. Highs only in the 20s.

MONDAY AND BEYOND: Mostly to partly cloudy skies will dominate the week. Temperatures will be cold, though, as highs will only be in the 20s to near 30 all week.

Bundle up next week!

Categories: Local News, Weather Daily