Right now, the Northeast or winter monsoons are sweeping through Tamil Nadu. While we felt the first few thundershowers around Diwali last month, more squally weather is anticipated till the end of this year. The sky often changes colours swiftly from dark grey to clear blue. Here are a few pictures of the sky, taken in the past few days.
|Looming Dark Thunderclouds|
|Next Morning: Clear Skies and A Rainbow|
In summer, while the Asian continent is steadily getting heated, the surrounding giant ocean does not get similarly heated. Reason: land heats up and cools down much faster than water. The difference in heat between the land and water bodies is huge, since on the one hand we have the large Asian continent and on the other, we have an equally vast Indian ocean. As the hot air above the land rises, a low pressure is created. The cooler air from above the ocean rushes in to fill the void. Laden with moisture from the oceans, winds (blowing from the south west to the north east) hit the Indian coast by the end of summer. The date of arrival is around June 1st. This is the summer or Southwest monsoons.
Later in the year when the sun retreats, the land cools rapidly, while the ocean still holds its heat. The result is a high pressure zone over the land, which causes the wind from the Himalayas to sweep down towards the Indian Ocean. These winds pick up moisture from the Bay of Bengal and bring rain to Tamil Nadu and other parts; these are known as the Northeast monsoon or the retreating monsoon.
|Southern Sky at 11 a.m.: Cloudy Turmoil|
|Western Sky at 11 a.m.: Azure Blue Skies|
|Evening Sky at 6 p.m.: A Beautiful Sunset|
|Soft Pink Glow|
Linked to Skywatch