Yesterday there was a tornado watch for the Northeastern New England area, including warnings of penny-sized hail and extreme thunderstorms. It was partly sunny in Cambridge until about 3PM, when suddenly within 30 minutes it went from being sunny to so dark that you might mistake it for being night time. Wind gusts were strong and random, going in different directions with every gust. Mother Nature really looked angry; even the air felt electrified, as if the entire Earth would crack open at any moment.
Only 2 minutes after I snapped this picture from my office window, it started pouring and the white sky visible near the chimney stacks turned dark gray. The chimney stacks disappeared when it started pouring, and I couldn't see more than 2 or 3 blocks out.