Mausam Srsti: Summer talk

Very Severe Heat Wave Conditions Prevail over Andhra, Telangana, North-interior Karnataka:

During summer, the land heats up enormously irrespective of places. The pre-monsoonal heat plays an essential role to develop the Low-pressure void over india, which helps in monsoonal pull. This year, the heat was enormously building up and many places in Andhra and Telangana recording 45 degrees plus temperatures. Even the minimum temperatures getting settled at 30-35 degrees at some places, which gives the clear evidence of heat energy supplied from sun to indian land-mass.

Reason for intense heat:

CASE--1:

Generally the dryness in the atmosphere makes an important role in making up the heat. When the sun heats the dry particles, the heat can be easily transferred from one place to another place. If a place contains rocky hills, more heat is trapped along and leads to 45 degrees plus temperatures (Example--Kurnool, Anathapur, Kadapa). If for suppose a place has green hills which traps the dry winds and makes the air moist, such places get temperatures near 35-40 degrees (Example-kerala, Coastal karnataka). Another case is if the winds from sea, moves away from coast and allowing the dry air in interiors to spread along the coast...then the coastal areas get 40-45 degrees (Example--Bhubaneshwar, Chennai). During April, the sun shines vertically over many places of south india and the places which are under their respective criteria, as mentioned above gets their heat. Even some times, there will a flow of heat from The Great-indian desert( Thar desert). The dry particles accumulate and creates more heat in the surrounding areas, where the heat flows from the desert.

CASE-2:

Places which received less rainfall during their last year monsoon, gets easily more heat. So the rain should materialize heat during their season. Once, a sunny day occurs, heat start building up and the heat and mass transfer take place between the places.

SPECIAL CASE:

The tropical cyclones that form around india, makes some great heat over india, particularly south-india. When suppose a cyclone forms in bay of bengal and comes close to andhra coast and recurves to Burma/Bangladesh, the South side of cyclone pulls moisture from inland and feed it around the eyewall of cyclone. This causes the decrease in moisture levels and create more amount of heat in the inland.

Example:

During 2003, there was a cyclone in Bay of Bengal and it moved northeast wards and crossed the caost of Burma. After its dissipation, the heat started to build in greater amounts over Coastal Tamilnadu and Coastal Andhra. Around May 31 st, Tiruttani of Tamilnadu got 48.3 degrees, Chennai got 45 degrees, Tirupati of Andhra got 45.3 degrees, Nellore got 46 degrees, Arakkonam got 47 degrees....which was a record break heat in the history of Tamilnadu.

Many times the systems that form in Bay of Bengal, moves towards Burma or Bangladesh, triggering heat wave across the states of andhra pradesh and odisha.

Heat waves are the period of time at which, the temperatures are above normal.

Suppose: a place has an average 38 degrees in may...if it gets

40-42 degrees-Mild heat wave

42-45 degrees- Moderate Heat Wave

45-49 degrees-Severe Heat wave

49-51 degrees-Very severe Heat wave

51 and above- Intense Heat wave

Recently many places in Andhra and Telangana recording 45,46,47 even 48 degrees. Average value is generally 40 degrees, but due to Severe Heat wave conditions, the temperatures are notching. The trend is likely to continue for the next 5-6 days. But no relief is expected till second week of May.

The dry north-east winds are the sole responsible for increase in heat. Further, there is very very less moisture available in lower levels, to generate a Thunderstorm. Even some areas getting convergence for building thunderstorms, things are not materializing.

RECENT HEAT WAVE:

PRE-MONSOONAL SHOWERS???

Yes there will be a start of premonsoonal season from next monday....Telangana and parts of north-coastal andhra will get some odd showers