Chart of the day: DEC-23 second least snowy (December) 1966-2023
Discussion: January 2024 looks like a snowy and cold month across the U.S. However, December 2023 produced the second lowest North America snow cover in the 1966-2023 climatology. The least snowy December was in 1980 which was a brutally cold month across Canada and the Northeast U.S. but moisture starved limiting snowfall.
Medium-range 6-10 Day Forecast Valid January 10-14, 2024
Discussion: The 6-10-day forecast continues to combine the GFS and ECM and the forecast trend since yesterday is colder. Arctic air is vividly projected across the Northern Rockies and the Great Plains trend is colder.
Medium-range 11-15 Day Forecast Valid January 15-19, 2024
Discussion: The 11-15-day forecast is slightly colder mainly due to a stronger arctic air signature in the Alberta to Great Plains stretch. California also trends cooler.
U.S. Medium-range Precipitation Forecast
Discussion: In the 6-10-day period, an impressive heavy snow pattern spreads across the northern half of the U.S. helping to enhance the incoming arctic chill. Heavy rain affects Florida and the Southeast U.S. with heavy snow Interior Northeast and rain on the coast. The 11-15-day forecast emphasizes a West Coast storm track.
Days 16-20 Extended range Temperature Forecast valid January 20-24, 2024
Discussion: The CFS V2 reveals more cold weather in the extended range from the Continental Divide eastward except marginally chilly on the East Coast.