hot season from March to May
is the traditional
period when the winter pattern of pressure and
winds gets disturbed prior to the establishment of
the summer monsoon and hence, is often referred
to as 'Pre - Monsoon' season. This season is characterised
by heavy dust haze and extremely high temperature over
North India. Land and sea breeze effect is prominant
over the coastal areas during this season. The frequency
of thunderstromes increases progressively over south India
with increased influx of moist air from the sea. As
the season advances, a few tropical cyclones form in the Indian
seas, but they generally move north or northeast and strike
the Bengal, Bengladesh or Burma coasts.
Convective activity is essential for
the occurence of thunder and dust stroms. With the
advance of summer, thunder activity becomes pronounced in
April and May due to ground heating mainly over inland stations.
In Tamil Nadu May is the hottest Month
with the mean daily maximum temperature os 36C in
the plains, hilly region in the west recording about 13C lowest.
The highest temp ever recorded at an
individual station in the plains is 46.3 at Thirupattur
on 4th May 1976 which is 9.6C higher than the normal for
the warmest month. Uthagamandalam a hill station
registered the highest maximum temperature of 28.5C on 29th
april 1986 which was 5.8C higher than the normal for
the warmest month.