storm clouds signifying cold front after heatwave

storm clouds signifying cold front heatwave towering loom ominously landscape dark churning masses signaling arrival sky clear blistering reflects dramatic shift weather approaching hinting powerful refreshing change contrast lingering warmth encroaching chill palpable setting stage climatic transition extreme global warming climate severe ominous atmospheric nature stormy cloudscape overcast rain thunderstorm forecast environment meteorology natural disaster impending threat moody grey turbulent gloomy intense wild unpredictable hazard danger warning unsettled disturbance crisis