The second named storm of the 2017 annual cyclone season, Mora developed from an area of low pressure over the southeastern Bay of Bengal on May 28.

Across its path, Mora dropped a large amount of rain, including 225mm of rainfall in Chittagong and northeast India.

Favorable conditions, characterized by low wind shear and warm sea surface temperatures, allowed for the development of rainbands and the beginnings of circulation on May 27.

[6][7][8] That same day, the India Meteorological Department (IMD) noted that there was a high likelihood that the low-pressure area would organize into a tropical depression.

[10] The Joint Typhoon Warning Center classified the disturbance as a tropical cyclone when the storm continued to intensify.

Maritime weather alerts were issued for the Bangladeshi ports of Chittagong, Cox's Bazar, Mongla and Payra, under the anticipation of a 1.2 to 1.5 m (4 to 5 ft) storm surge.

[16] Red Crescent volunteers and medical units were on alert as government offices in coastal zones closed.

A meteorological office issued a warning for Chittagong and Cox's Bazar as the cyclonic storm Mora headed towards Bangladesh.

[17] The India Meteorological Department issued Tropical cyclone warnings and watches for the Indian states of Mizoram, Nagaland, Manipur, West Bengal and Tripura.

The Mizoram government expected that the cyclone could cause landslides and floods, so warnings were issued which advised residents to take precautions and preventive measures.

[18] The Myanmar Red Cross Society placed alerts in Chin, Rakhine, Magway, and Sagaing, and activated emergency response teams.

Strong winds and storm surge battered buildings and destroyed farmlands across Chittagong, Cox's Bazar, and Rangamati.

[27] Cyclone Mora caused severe flooding in the Indian states of Meghalaya, Assam, Manipur and Mizoram in northeast India.

[1] Heavy rains caused by cyclone Mora hit the Indian state of Mizoram, disrupting power and telecommunications.

The World Food Program provided emergency food rations and large quantities of dry biscuits to affected residents, while the United Nations Children's Fund supplied hygiene kits, water purification tablets, and recreation kits for affected refugee children.

The United Nations Population Fund provided high-quality medical care to pregnant women, new mothers and their newborn children in the camps.