Rarest clouds in the world appear over the San Francisco Bay Area
Noctilucent clouds — the rarest clouds in the world — glowed like shimmering cobwebs in the sky over the San Francisco Bay Area early Friday morning.
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Noctilucent clouds — the rarest clouds in the world — glowed like shimmering cobwebs in the sky over the San Francisco Bay Area early Friday morning.
Read MoreBay Area News