1. Weather conditions that are unpredictable and subject to rapid changes, characterized by variable temperatures, erratic precipitation, and shifting wind patterns
The unstable weather made it difficult to plan the outdoor event.
O tempo instável dificultou o planejamento do evento ao ar livre.
2. Atmospheric conditions prone to sudden shifts between different weather patterns
Unstable weather in spring often leads to severe thunderstorms.
O tempo instável na primavera frequentemente leva a tempestades severas.