(Phil
Plait, Slate) People
on the main island of Japan are preparing to get hit by the strongest cyclone
the Western Pacific has seen in the 2014 season: Typhoon Neoguri. It has
already passed over Okinawa, and its 190 kilometer per hour (118 mh) gusts left
widespread damage and at least one person dead.
The
good news is that it’s drawing in dry air, which is weakening the system;
cyclones like this need warm moisture for power. As I write this, its sustained
winds are clocked at about 105 kph (66 mph), still very strong. The size of the
typhoon is incredible; it's easily thousands of kilometers across. Evacuations have
been advised for hundreds of thousands of people in Japan, and tens of
thousands are without power.
Over
the past day astronauts on board the International Space Station have passed
over the typhoon, and they have taken astonishing pictures of the storm system.
As always, pictures like these are amazingly beautiful, but never doubt for a
second that what you are seeing is as destructive and dangerous as it is
awe-inspiring and lovely.
From
a Distance
As
the ISS approaches the storm, Neoguri is seen from thousands of kilometers away
on the limb of the Earth. As astronaut Alexander Gerst exclaimed,
“The Super Typhoon
Neoguri did not even fit in our fisheye lens view. I have never seen anything
like this.”
Feeder
Bands
As
the station passed over the outskirts of the typhoon, the spiral “feeder bands”
were prominent. These are squalls of rain showers fed by warm ocean water, and
can get very well-defined as the storm gets stronger. The long, thin streamers
pointing away from the center are cirrus outflow clouds, well above the spiral
bands and moving outward. Note the Russian spacecraft in the foreground, used
to transport astronauts and supplies to and from the ISS.
Galactic
Cyclone
Another,
slightly different view of the feeder bands shows massive convective storms
along them, where warm air rises to form giant cumulonimbus clouds (towering
columns shaped like cauliflower). Although the physics is very different, the
similarity to the arms of a spiral galaxy is striking.
Down
the Eye
By
an orbital coincidence, the space station passed directly over the eye of the
typhoon, where the air pressure is lowest. Warm air near the ocean surface from
outside the eye wall moves inward and upward, spreading out over the top of the
typhoon. Inside the eye air is dropping down, where it dries out and becomes
clear. It’s relatively calm inside the eye, with the fiercest winds in the eye
wall.
The
Eye of the Storm
A
closer view of the eye shows details and shadows inside. Gerst estimates the
size to be 65 kilometers (40 miles) in diameter.
Oblique
Eye
As
the ISS moved on, astronauts got an oblique view of the eye. This makes depth
more obvious and the vertical structures in the inner feeder bands and eye wall
easier to see.
Overview
NASA’s
Aqua satellite took this jaw-dropping shot of the typhoon on July 8, 2014, at
05:00 UTC. To the left of the eye is the coast of China, and the island of
Taiwan is to the eye's lower left. The sheer size of the typhoon is amazing.
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