Bomb Cyclone

Recently, the readers might have come across viral photos and videos of homes, cars, roads, lawns etc. covered in four feet of snow near the Great Lakes Region in North America. This snowfall occurred, unexpectedly, in a very short period. The meteorologist attributed this atmospheric event to the Bomb Cyclone. However, most people don’t know the … Read more

Temperate Cyclone

Temperate cyclone is rotating weather system which is formed in mid-latitudes. Frontal Cyclones, mid-latitude depressions, extra-tropical cyclones are all synonyms of temperate cyclone. They derive their name from temperate climates which exist in the mid-latitudinal zone i.e. 30° to 60°latitudes. It is this zone where the warm tropical air mass meets the cold polar Air … Read more

What is a Cold Wave?

The winter season starts to set in after the autumnal solstice (23rd September) in the northern hemisphere. The months of December and January are the coldest months of winter in India. We often hear the news of cold waves. The reporters warn us of the different alerts issued by the Indian Meteorological Department (IMD). However, … Read more

Tropical Cyclones

Cyclones are one of the most hazardous atmospheric events. Therefore, disaster management authorities have to issue early warning to the public, take risk reduction measures, prepare rescue strategies and plan rehabilitation before such events occur. Hence, disaster managers must know the types of cyclones, their origin and characteristics. Cyclones are primarily of two types i.e. … Read more

Why Air Pollution in Delhi Increases During Winters?

Air pollution is a health hazard in most of the large cities in Indian sub-continent. However, the air pollution in Delhi during winter season is most notorious amongst them all. However, the air quality degrades in most of the areas of north India during the winter season. Why does it happen? To understand that, we … Read more

Where is it Six Months of Day and Night?

All of us know that earth rotates around its axis in 24 hours which, generally, contains 12 hours of daylight and 12 hours of night. The length of day and night varies, seasonally. The days become longer during the summer months and shorter during the winter months. However, there are two regions on earth which … Read more

Coriolis Force and Pressure Gradient Force

Coriolis Force and Pressure Gradient Force (PGF) along with Frictional Force are three important forces which determine the direction, speed and curvature of winds both horizontally and vertically. What is Coriolis Force? Coriolis force is the force which is exerted by the rotating Earth on the objects moving on its surface. For example, any moving … Read more

Why Monsoon in India Arrive in Summer?

Monsoon is derived from an Arabic word ‘mausin’ which refers to the seasonal reversal of winds. The Arab traders used to sail their ships to India with the help of these winds. Monsoon in India is an annual phenomena and acts as the rhythm to which most socio-cultural and economic phenomenon align. Definition of Monsoon? … Read more

What is Heat Wave and its types?

Presently, North India is reeling under very hot weather. A common person hears the news of heat wave very often during the months from March to June in India. In this article we will discuss the exact definition of heat waves and the reason of heat waves. What is Heat Wave? We, often, think that … Read more

El Nino and Southern Oscillation

What is El Nino? El Nino is a recurring warm ocean current on the west coast of Ecuador, Peru and Chile. Normally on the western coast of Latin America, a cold current flows from the south pacific ocean towards the  equator. This cold current is known as Humboldt Cold Current (Fig. 1). The Humboldt current … Read more