Polar Vortex February 2025 Predictions. A strong/stable polar vortex usually means strong polar circulation and jet stream. With the polar vortex (pv) playing a crucial role.

In contrast, a weak/disrupted polar vortex creates a weak jet stream pattern. A negative nao is much more common in a la nina year than an el nino year, but especially in a neutral year, which we won’t be far from.