Timeline of the 2013 North Indian Ocean cyclone season

[3] In November, cyclones Helen and Lehar formed, and they both made landfall in Andhra Pradesh just one week away from each other.

[4] This timeline documents all the events of this season, including the strengthening, weakening, formation, dissipation, and landfall of tropical cyclones in both the Bay of Bengal and the Arabian Sea.

When depressions form in the Bay of Bengal, they receive the prefix BOB by the India Meteorological Department (IMD).

The Joint Typhoon Warning Center (JTWC) also creates advisories on storms in the North Indian Ocean.

Best track data from the IMD and JTWC is utilized in this article, which means that post-storm analyses take precedence over operational advisories and the like.

The track of Cyclone Viyaru over the Bay of Bengal. The cyclone moved northeast for about half its lifespan, and then curved and moved northwest, making landfall on Bangladesh.
Track of Cyclone Viyaru, according to the Saffir–Simpson wind scale
Depression BOB 02 on May 29, 2013. The depression is over northeast India, with another circular area of clouds southeast of it.
Depression BOB 02 on May 29
Cyclone Phailin on October 10. The cyclone is off the coast of eastern India, and is very large. The Andaman and Nicobar Islands can be seen to the right of Phailin. It has a very distinct and clear eye at its center.
Cyclone Phailin on October 10
Deep Depression ARB 01 slightly east of the coast of Somalia on November 10, 2013. The system does not feature an eye and is relatively small.
Deep Depression ARB 01 near the coast of Somalia on November 10
The track of Cyclone Helen. It starts somewhat west of the Andaman and Nicobar Islands. It then continues westward, strengthening as it approaches Odisha and Andhra Pradesh, and weakening once it makes landfall.
Track of Cyclone Helen according to the Saffir–Simpson wind scale
Cyclone Lehar near the Andaman and Nicobar Islands on November 25, 2013. The cyclone does not have an eye and its shape resembles an oval.
Cyclone Lehar on November 25
Cyclone Madi on December 7. It is near the southern coast of India. The inner area of the system looks like a small swirl.
Cyclone Madi on December 7