Watch: Rare shelf cloud seen over Maryland amid severe weather

Video shows the phenomenon floating over the city of Bowie as storms and flooding hit areas across the Northeast US.

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The rare cloud formation that forms along the foremost edge of a thunderstorm's gust front signals intensifying conditions.

An eyewitness captured the striking moment as the sky darkened and winds picked up. Video also shows flash flooding hitting Washington DC and Massachusetts because of storms in the Northeast US.

ShareSave'Their house was swept away. We lost three beautiful friends'The death toll from the flash floods has now climbed to more than 100 people and an unknown number of others are missing.

Watch: Drone footage shows catastrophic flooding in Texas townVideo shows raging floodwaters after the San Gabriel River burst its banks, partially submerging buildings.