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Астронет: Астрономическая картинка дня Трубчатые облака над Саскачеваном http://variable-stars.ru/db/msg/1753596/eng |
Credit & Copyright: Michael F Johnston
Explanation:
When do cloud bottoms appear like bubbles?
Normally,
cloud bottoms are flat.
This is because moist warm air
that rises and cools will condense into water droplets at a specific
temperature,
which usually corresponds to a very specific height.
As water
droplets grow, an opaque cloud forms.
Under some conditions, however, cloud pockets can develop that contain large droplets
of water or ice
that fall into clear air as they evaporate.
Such pockets may occur in
turbulent
air near a thunderstorm.
Resulting mammatus clouds can appear especially
dramatic if
sunlit from the side.
The
mammatus clouds
pictured here, lasting only a few minutes, were photographed over
Regina,
Saskatchewan,
Canada,
just after a storm in 2012.
Meteor Shower Tonight:
Peak
of the Perseids
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.