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Thick fog creates a 'tsunami' of wave clouds on a beach in Florida, US. The phenomenon was snapped by pilot JR Hott
Fallstreak holes are a cloud formation that occurs as gaps in mid or high level cloud layers. In order for a fallstreak hole to form, the cloud layer must be composed of supercooled droplets. When one region of the cloud begins to freeze, the fallstreak hole forms. This begins a chain reaction whereby all the moisture from the supercooled droplets in the nearby area is drawn in and joins the ice crystals. These then grow big enough to fall beneath the hole; it can reach 50 kilometres across.
view of aurora australis from space