A substantial part of the Northern U.S. is affected by a combination of winter storm warnings and watch areas including Lake-effect Snow Warnings valid for today and tomorrow. Jackpot snowfall amounts stretch from North Dakota to Iowa today/tonight (4-6 inches) increasing to 6-14 inches Iowa to Indiana (and centered on Chicago) tomorrow.

In Chicago, colder weather arrives to end November. However, peak intensity of cold settles on Chicago next week. In the extended range, the chill modifies but continues toward mid-December. Snow is on the ground to sustain the cold.

November has been cooler than normal across much of Australia due to a semi-permanent upper trough centered southeast of Australia. The upper trough remains in place well through DEC-25. The upper trough inspires wet risk on the North and East Coast while west of the trough a dry and increasingly hotter-than-normal weather pattern emerges in DEC-25.

Combining equally the GFS and ECM produces a dry and hot forecast across Argentina while East Brazil is wetter than normal. An interruption in this (new) pattern appears in the 6-10-day forecast as widespread rain affects both Argentina and Brazil.