p>In the Pacific and Indian Oceans, the usual targets are Bangladesh, the Philippines, Myanmar, Laos, Vietnam, Japan and India. And we'll get to some of the worst storms in a moment.

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Meteorologists use the term tropical cyclone to describe any rotating system of clouds and thunderstorms that originates over tropical or subtropical waters and which has a closed, low-level circulation.

But only those that form over the Atlantic or eastern Pacific Ocean are hurricanes. The rest are typhoons.

… Like clockwork 

Tropical cyclones are most common during the northern hemisphere's late summer and autumn, so around September and October. 

When the water temperature in the North Atlantic goes over 26-27 degrees Celsius (about 78-80 degrees Fahrenheit), warm, wet air rises, leaving an area of low pressure behind.

That low pressure attracts high pressure air from its surroundings. The new air gets sucked into the mix. And this monster starts to grow: It rises, cools, creates clouds, and begins to swirl because of the Earth's rotation. The young tropical cyclone sucks in more and more hot air, feeding off that energy, making it mightier still.

In the center, it's a windless zone. That's the eye of the storm.  

All that combined can create a rolling beast, hundreds of kilometers in diameter, packing winds of up to 300 kilometers per hour (186 miles per hour), and dumping end-of-the-world like rain storms when it makes landfall.

We know that, and yet we are always struck by the destruction and death these storms cause.

Before records began

Geologists say they can tell that tropical cyclones have been doing their thing for thousands of years. For instance, they think that layers of sediment at the bottom of a lake in Alabama, in the US, were brought there from the nearby Gulf of Mexico by storm surges associated with intense hurricanes about 3,000 years ago.

We've since learned to keep meticulous weather records. It allows us to understand these weather events better, but we still can't control them. With satellite data, we really can "see them from miles off," and that means we can predict and prepare — theoretically, at least, because they still manage to catch and kill us.

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One of the worst in our more recent history hit India 300 years ago.

Hugli River Cyclone

Also known as the Hooghly River or Calcutta Cyclone, it's been described as "one of the deadliest natural disasters of all time."

It made landfall on October 11, 1737, in the Ganges River Delta, causing a storm surge of 10-13 meters (30-40 feet). There are reports of 381 millimeters (15 inches) of rain in a 6-hour period. The storm tracked approximately 330 km inland before dissipating.

Between 300,000 and 350,000 people died.

The Great Hurricane

In the history books the Hugli River Hurricane is often followed by the Great Hurricane of 1780 in Barbados. Records are a bit sketchy, however. It's thought to have formed near the Cape Verde Islands around October 9, before tracking westward. It passed Martinique and St. Lucia, then Puerto Rico and the Dominican Republic.

Barbados reported 4,500 deaths, St. Lucia cited 6,000 dead and about 9,000 in Martinique. The total number of dead is somewhere between 22,000 and 27,000. 

Haiphong Typhoon

Pacific typhoons regularly track over the Gulf of Tonkin and that's exactly what this one did in October 1881. It originated near the Philippines, and wreaked its devastation in Haiphong, Vietnam, and along the local coastline.

It created an almighty storm surge that killed 300,000 people. And that's just the direct death toll. It's thought many more died as a result of ensuing disease and starvation.

Galveston Hurricane

In 1900, a Category 4 Hurricane hit Galveston, Texas. It wouldn't have been the first and it certainly was not the last time. The small town in the Gulf of Mexico also got whipped by Hurricane Alicia in 1983 and Hurricane Ike in 2008.

But the one in 1900 is noted as one of the worst. It left between 8,000 and 12,000 people dead. The population back then was just under 38,000.

A Category 4 storm is not even the worst, so that death toll is staggering.

According to the Saffir/Simpson Hurricane Wind Scale, the categories are ranked like this:

Category 1 – winds speeds of 119-153 kilometers per hour (74-95 miles per hour)       

Category 2 – winds speeds of 154-177 kmh (96-110 mph)

Category 3 (classed as major) – winds speeds of 178-208 kmh (111-129 mph)

Category 4 (major) – wind speeds of 209-251 kmh (130-165 mph)

Category 5 (major) – wind speeds of 252 kmh or higher (157 mph or higher)

The Great Bhola Cyclone

As with Galveston, Bangladesh has been struck more than once. In November 1970, it was the trails of a tropical storm that in a sense re-intensified it.

Satellite images held by the US National Oceanic and Atmospheric Administration (NOAA) show a "well-defined cyclone" with winds of 137-145 kmh on November 11. A day later, its wind speed was over 220 kmh. Meteorologists could see it coming, but it's said there was no way of communicating the danger to those in the cyclone's path. As a result, at least 300,000 people died. Some estimates put the death toll at 500,000.

In 1991, Bangladesh was hit by another major storm. That time, about 138,000 died.

Super Typhoon Nina

It wasn't dubbed "super" for nothing. Super Typhoon Nina was short-lived but intense — and early in the season. At its peak of 185 kmh, Nina passed Taiwan to make landfall at China's coastal city of Hualien. The typhoon caused the Banqiao and Shimantan Dams to collapse, and unprecedented flooding and destruction downstream. Nina dumped 189.5 mm of rain per hour. Estimates put the number of dead at between 171,000 and 229,000.

Hurricane Katrina

One of America's most prominent hurricanes pales somewhat by the number of dead, but that's not to say that Hurricane Katrina was any less devastating for the people of New Orleans.

In 2005, Katrina killed less than 2,000 people. You could say the city got off lightly. But many people were displaced or lost — as is often the case when these tropical cyclones hit. The total cost of all the damage was estimated to be about $108 billion (€92 billion). It's one of the worst cases of natural destruction in world history.

Hurricane Maria

It's since been increased to 2,975. As with Katrina, even one death is too many, but it was a far lower cost to life than at other times. The cost to property, meanwhile, topped $90 billion.

Cyclone Nargis

Finally, the story of Cyclone Nargis in 2008 can remind us just how many people, in how many countries, a storm can affect once it gets going. It was also a bit of a freak event as it formed in late April of that year. It is classified as one of the deadliest cyclones to hit Asia since the 1991 Bangladesh event.

Nargis took in India, Thailand, Myanmar, Sri Lanka, Laos, Bangladesh and others with its category 4 fury. Rough statistics suggest 140,000 people died, but the real number could be closer to 1 million.

However, really final it is not, because we've still to witness the full destruction leveled by the 2018 season of tropical cyclones. Currently Typhoon Jebi has made a nasty start in Japan and Hurricane Florence at the US coast is close behind. ​​​​​​

It should go without saying that this list of tropical cyclones is far from complete or comprehensive. But it tells a very clear story. If you're lucky enough to get a warning in time, heed that warning and advice, and get to safety as fast as you can.