Medium-range models reaching toward middle November with powerful northeast Pacific trough and stretched PNA ridge preventing cold air access to Canada and U.S.
Powerful Pacific jet stream offsets/outweighs any immediate influences from next week's Sudden Stratospheric Warming expectation (thanks to super Niño).
Models have been advertising weaker warmth or cooler variability in 11-15 day, but have struggled to advance that into more skillful 6-10 day, with warmer changes for Midwest, East, and South.
@MikeTFox5 If this had been a Modoki El Niño like 2009...yikes! But this strongest-of-all-time , super east-based event will make it difficult to break through.
Unlike last year at this time, Euro weeklies keep Pacific split flow going into early December, keeping Canada very warm, and probably not warm enough for Lower 48. Powerful El Niño influences seen to continue.
Super El Niño, with a dash of strong -PDO, is deflecting stratospheric warming influences for North America. Strong Pacific jet stream flow undercuts blocking efforts in the North Pacific.
Earliest SSW in recorded history is forecast next week, with near real-time impacts for colder European trends, as Arctic and North Atlantic Oscillations veer negative.
@Snowlover111232@AdamFurey4 Correct- the common warmer areas (Central to East) with -PDO are higher population centers for more bearish U.S. energy demand. Many of our warmest winters (including 23-24 and priors like 11-12 were -PDO). Combined with climate trends, it helps with the warm winter narrative.
Watching unusually early first-of-season stratospheric warming in Northern Hemisphere. But this year's super El Niño could significantly outweigh anything else, such as this factor.
Another late 11-15 day pattern battle between traditional (NWP) models, including the European, and the AI models. Pacific pattern looks warmer/bearish with troughing into the West Coast.
@AntoineLiagre1@AdamFurey4 Yeah in recent years, the warm pool has been so strong in the North Central Pacific that it drives the PDO index very negative w/o the classic "blue horseshoe" in the east.