U.S, Medium-range Forecast: Emerging Western U.S. chill ahead. Northeast looks colder in the extended range.
Chart of the day: Climate signals support colder West ahead. Discussion: The Pacific North America (PNA) index trends into a moderate-to-strong negative phase in the 8-14/11-15 day period supporting a colder western U.S. regime. Medium-range 6-10 Day Forecast Valid January 17-21, 2021 Medium-range 11-15 Day Forecast Valid January 22-26, 2021 Discussion: Northern warmth begins to…