Fishermen in Puri, India pull a boat to higher ground ahead of the impact of Tropical Cyclone Fani. Photo: Dibyangshu Sarkar/AFP/Getty Images

Tropical Cyclone Fani, currently a Category 4 storm, is expected to make landfall near the city of Puri on Friday.

The big picture: The Bay of Bengal has a devastating history of deadly storms. The most tragic was the Great Bhola Cyclone in November of 1970 — with an estimated 300k-500k death toll that makes it the deadliest tropical cyclone in history.

Why so many tropical cyclones form in the Bay of Bengal:

  • High sea surface temperatures
  • High availability of moisture
  • Complexes of thunderstorms are frequent from the Indian Monsoon and tropical weather cycles such as the Madden-Julian Oscillation. These can generate cyclones given the right conditions.

Mitigating disaster: Both countries have improved storm preparedness in recent years to decrease death tolls. In Bangladesh, 56,000 volunteers have been enlisted in coastal areas, warnings have been made through loudspeakers and via mobile phone call trees, and hundreds of thousands of pounds of food and supplies have been brought in.

The deadliest tropical cyclones from the Bay of Bengal (via Weather Underground):

  1. Great Bhola Cyclone — Bangladesh — 1970 — 300,000-500,000 deaths
  2. Hooghly River Cyclone — India and Bangladesh — 1737 — 300,000
  3. Coringa — India — 1839 —300,000
  4. Backerganj Cyclone — Bangladesh — 1584 — 200,000
  5. Great Backerganj Cyclone — Bangladesh — 1876 — 200,000
  6. Chittagong — Bangladesh — 1897 — 175,000
  7. Cyclone 02B — Bangladesh — 1991 — 138,866
  8. Cyclone Nargis — Myanmar — 2008 — 138,366
  9. Bangladesh — 1942 — 61,000
  10. India — 1935 — 60,000

Why Bay of Bengal storms are so deadly:

  • The low-lying coastal areas of both countries are densely populated, raising the specter of human loss when a storm hits.
  • The shape of the Bay of Bengal compounds cyclones’ storm surge, often pushing water well inland.

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A satellite image of Hurricane Zeta. Photo: National Hurricane Center/NOAA

Hurricane Zeta has killed at least one person after a downed power line electrocuted a 55-year-old in Louisiana as the storm moved into Alabama overnight.

What's happening: After "battering southeastern Louisiana and southern Mississippi," it began lashing Alabama late Wednesday, per the National Hurricane Center.

Taiwan reaches a record 200 days with no local coronavirus cases

Catholics go through containment protocols including body-temperature measurement and hands-sanitisation before entering the Saint Christopher Parish Church, Taipei City, Taiwan, in July. Photo: Ceng Shou Yi/NurPhoto via Getty Images

Taiwan on Thursday marked no locally transmitted coronavirus cases for 200 days, as the island of 23 million people's total number of infections reported stands at 550 and the COVID-19 death toll at seven.

Why it matters: Nowhere else in the world has reached such a milestone. While COVID-19 cases surge across the U.S. and Europe, Taiwan's last locally transmitted case was on April 12. Experts credit tightly regulated travel, early border closure, "rigorous contact tracing, technology-enforced quarantine and universal mask wearing," along with the island state's previous experience with the SARS virus, per Bloomberg.

Go deeper: As Taiwan's profile rises, so does risk of conflict with China

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