Today it is 4th
Aug 2024. Yet it appeared as if we were
in the midst of hot summer in Chennai. Blazing
heat caught up with the city as mercury shot up and people out on roads felt
the heat too much to handle. However,
the weather for the next 24 hours is
expected to be partly cloudy, with a chance of light to moderate rainfall in
several areas of the metropolitan region. At Triplicane, it did rain heavily for half an
hour or so !
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All of us get
fascinated by rain clouds – watching them hover over is really interesting as
we look forward to good rains. Clouds
form through the process of condensation when water vapor, primarily from the
oceans, rises into the atmosphere where it cools and condenses into cloud
formations. If the condensed droplets in a cloud get large enough, they’ll fall
as precipitation. Rain clouds, or nimbus, produce everything from drizzle to
downpours; more violent relatives of theirs may unleash rain as part of intense
thunderstorms.
Rain water does not fall out of a clear, blue sky. You need
clouds. Clouds form from water or ice that has evaporated from Earth’s surface,
or from plants that give off water and oxygen as a product of photosynthesis.
When it evaporates—that is, rises from Earth’s surface into the atmosphere—water
is in the form of a gas, water vapor. Water vapor turns into clouds when it
cools and condenses—that is, turns back into liquid water or ice. In order to
condense, the water vapor must have a solid to glom onto. This solid “seed” may
be a speck of dust or pollen, or a drop of water or crystal of ice. Dew is
water vapor that has condensed back onto Earth’s surface
It's pretty well-known
that most clouds are white, but rain clouds are usually a darker shade of gray.
Ever wondered why rain clouds are so dark?
Unlike atmospheric particles that scatter more blue light than other
colors (making the sky blue), the tiny cloud particles equally scatter all
colors of light, which together make up white light. However, rain clouds are
gray instead of white because of their thickness, or height. That is, a cloud
gets thicker and denser as it gathers more water droplets and ice crystals —
the thicker it gets, the more light it scatters, resulting in less light
penetrating all the way through it. The particles on the underside of the rain
cloud don't have a lot of light to scatter to your eyes, so the base appears
gray as you look on from the ground below.
This effect becomes more pronounced the larger the water droplets get —
such as right before they're large enough to fall from the sky as rain or snow
— because they become more efficient at absorbing light, rather than scattering
it.
Nimbus is an ancient
Latin word meaning “rain storm.” Rain or nimbus clouds tend to appear dark gray because their depth
and/or density of large water droplets obscures sunlight. Depending on temperature, nimbus clouds
may precipitate hail or snow instead of liquid rain. Cumulonimbus clouds are
also called thunderheads. Thunderheads produce rain, thunder, and lightning.
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கார் காலத்து ஆகாசமானது எம்பெருமானுடைய திருமேனி நிறத்தை ஒத்துள்ளது. ஒத்தன. இதோ இங்கே பெரியாழ்வாரின் பாசுரம்:
கருவுடை மேகங்கள் கண்டால்,
உன்னைக் கண்டால் ஒக்கும் கண்கள்*
உருவுடையாய்! உலகேழும் உண்டாக வந்து பிறந்தாய்!*
"நீர் கொண்டெழுந்த காளமேகம் போன்ற வடியையுடையவனே! உலகங்களுக்கு ஸத்தையுண்டாகும்படி இந்நிலத்தில் வந்து பிறந்தவனே!; மல்லிகைப்பூவின் பரிமளம் குன்றுவதற்கு முன்னே இதைச் சூடவா என்பதாம் ‘ஒக்கும்’ என்பதை முற்றாகக் கொண்டு கருவுடை மேகங்களைக் கண்டால் உன்னைக் காண்பதை ஒத்திருக்கும்: (அதுக்குமேலே) கண்கள் உருவுடையதாய் - கண்ணழகையுமுடையவனே!" என்று பாடுகிறார் ஸ்ரீ பட்டர்பிரான்.
Mamandur Veeravalli Srinivasan Sampathkumar
4.8.2024
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