On a Valentine’s Day, one might see heart-shaped symbols everywhere, even if they don’t exist. Because love is in the air!
But the red heart cloud below really appeared in July 2015 above Mount Cook National Park in New Zealand.
As explained by Astronomy Picture of the Day:
The cloud’s red color was caused by the Sun rising off the frame to the right.
Lenticular clouds are somewhat rare but can form in air that passes over a mountain.
Then, vertical eddies may form where rising air cools past the dew point causing water carried by the air to condense into droplets.
Here a companion video showing that the lenticular cloud was mostly stationary in the sky but shifted and vibrated with surrounding winds. The love cloud appears @ 1:29: