TOPICS: 4 &
coast of India receives
type of rainfall
1 Cyclonic
iv snowfall
North-West region of Brazil receives heavy rainfall, because
Q. T Select an appropriate option
a) The western
i. Convectional
iii. Orographic
b
i. This region is near to the Equator.
ii. There are dense forests in this region.
ii. This is mountainous region.
iv. Cloud formation is very high in this region.
c) The existence of
takes place on the leeward side of
mountains.
i. Grasslands
Rain-shadow region
ili. Deserts
IV. Dense forests
d) Starting from your holidays after annual examination to next year's
.
annual examination, identify the proper order of seasons in India,
i. Rainy season Winter
Retreat of Monsoon
Summer
ii. Winter Retreat of Monsoon Summer Rainy season
ini. Summer Rainy season Retreat of Monsoon
Winter
iv. Retreat of Monsoon Winter - Rainy season
Summer.
Answers
Answer:
Frequently asked Questions (FAQs) on Monsoon
1. What is the all India monthly and seasonal rainfall?
All India monthly rainfall is the amount of accumulated rainfall received over India
for a particular month. For example, All India monthly rainfall of June 2018 is
155.7mm. Similarly All India seasonal rainfall is the amount of accumulated rainfall
received over India for a particular season. e.g. All India seasonal rainfall of South-
West monsoon (JJAS) of 2018 is 804.1mm. These quantities are not constant; they
vary from year to year.
2. What do we mean by long period average (LPA) of rainfall?
LPA of rainfall is the rainfall recorded over a particular region for a given interval
(like month or season) average over a long period like 30years, 50-years etc. It
acts as a benchmark while forecasting the quantitative rainfall for that region for a
specific month or season. For example, LPA of south west monsoon rainfall over
Kerala for the months June, July, August and September are 556mm, 659mm,
427mm and 252mm respectively. Current LPA of all India south west monsoon
rainfall based on the average rainfall over the period 1961 -2010 is 880.6mm.
3. What is large excess, excess, normal, deficient, large deficient rainfall?
These are categories of rainfall used to describe realised rainfall averaged over
various temporal scales like daily, weekly, monthly etc for spatial scales like
districts, states operationally. Accordingly, when the realised rainfall is ≥60%, 20%
to 59%, -19% to +19%, -59% to -20%, -99% to -60% of long period average (LPA),
the rainfall is categorized as large excess, excess, normal, deficient, large deficient
respectively.
4. What is below normal, normal and above normal rainfall for the country as a
whole?
If ‘m” is the mean and “d” is the standard deviation of a long time series of any
climate variable like rainfall, temperature etc. Assuming the time series is normally
distributed, 68% of the observations fall within +/- 1 standard deviation (d) from the
mean (d). Therefore, when a realised value of the variable falls between m-d to
m+d, it is categories as normal. When the realised value is <(m-d), it is
categorised as below normal and when the realised value is > (m+d), it is
categorised as above normal.
In case of monsoon season (June to September) rainfall over India as a whole, the
long period average (LPA) is 88 cm and standard deviation is 9cm (about 10% of
mean value).Therefore, when the rainfall averaged over the country as a whole is
within ±10% from its long period average (LPA) or 90% to 110% of LPA, the