We are still on track for a winter system this weekend in much of KELOLAND. As of Friday morning, winter storm watches have been posted for much of western and northern KELOLAND. Many of these will be updated to either advisories or warnings later today.
Low pressure in southern Wyoming and northern Colorado is forecast to strengthen tonight and tomorrow, with snow to the north of the low over western KELOLAND. Snow will likely spread into parts of eastern KELOLAND after midnight.
The challenge tomorrow will be narrowing where the most intense band of snow develops. It appears areas along and north of highway 14 have the best chance of picking up several inches of snow, with areas of blowing snow developing through the day with north winds at 20-35mph.
The low will be quickly exiting Saturday night, but northwest winds and falling temperatures will make for very cold weather into Sunday morning.
Snowfall totals still look heaviest in western KELOLAND, where 6+” may fall in the northern and eastern slopes of the Black Hills. Amounts of 4-7″ will still be possible to Pierre, with an enhanced 3-6″ snowfall extending east through portions of northeastern KELOLAND. There is expected to be a sharp decline in snow accumulation to the south of highway 14. Sioux Falls will be in the trace to 2″ range, with most of the raw data suggesting an inch or less.
If you don’t like all this talk of winter weather, I have good news. A major warming trend is on the way next week just in time for Thanksgiving with highs in the 40s and 50s. The jet stream in retreating well to the north and the polar vortex over Alaska is forecast to remain stationary, which will act to funnel mild, Pacific Air into the northern plains. I wouldn’t be surprised if there were some 60s late next week in spots where this weekend snow is light. Stay tuned!