Adisease that occurs suddenly and does not last a long time is considered .

Increase in surface pressure over Australia

Increase in surface pressure over the eastern Pacific

Decrease in surface pressure over Indonesia

Australia, Indonesia, Philippines suffer droughts;

The first signs of an El Nino are an unusual warming of the water in the tropical Pacific Ocean,
In turn, this results in increases in rising warm air, changes in the air pressure patterns and shifts in the high-level winds that direct the movement of weather.