GEOGRAPHY - CLASS 12 - 04.10.2021
Today’s class being a continuation of the last class, started with a brief introduction on – “ Local winds” a) Local winds are winds that blow over a particular region. b) There are a lot of local winds – around 70 to 80. c) Non-periodical local winds can be classified as hot winds and cold winds. HOT WINDS: 1)CHINOOK AND FOEHN a) Chinook and Foehn - warm winds descend from the mountains Rockies and Alps (leeward side) respectively, which increases the temperature of that region. b) Arrival of these winds…
GEOGRAPHY CLASS 11 - 27.09.2021
Today’s class started with an important topic of climatology – “Monsoon”. Monsoons are caused by the annual variation in the temperatures. · Sir Edmund Halley gave a theory on the Monsoon as “the extension of land and sea breeze on a larger scale” . · Flohn stated that monsoon is the result of seasonal migration of planetary winds and pressure belts. · Jet stream theory – causes the onset and withdrawal of monsoons. SUB TROPICAL WESTERLY JET STREAMS(STWJS): i. These STWJS flow f…
GEOGRAPHY CLASS 10 - 22.09.2021
JET STREAMS AND INDIAN MONSOON ORIGIN OF JET STREAM: The term was introduced in 1947 by Swedish-born US meteorologist Carl-Gustaf Rossby It is used to describe a very strong westerly wind blowing at a higher altitude just below the Tropopause. The highest streams occur during winter SALIENT FEATURES OF JET STREAMS: They generally circulate both the hemisphere so they are called Circumpolar winds Since they are higher altitude wind they are estimated to blow at 6-14 km height They are called as High-Altitude Westerly Wind system These stre…
