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While both tropical cyclones and tornadoes are atmospheric vortices, they have little in common. Tornadoes have diameters on the scale of hundreds of meters and are produced from a single convective storm (i.e. a thunderstorm or cumulonimbus cloud). A tropical cyclone, however, has a diameter on the scale of hundreds of kilometers and is comprised of several to dozens of convective storms.
Additionally, while tornadoes require substantial vertical shear of the horizontal winds to provide ideal conditions for tornado genesis, tropical cyclones require very low values of tropospheric vertical shear in order to form and grow. Tornadoes are produced in regions of large temperature gradient, while tropical cyclones are generated in regions of near zero horizontal temperature gradient.
Also, tornadoes are primarily an over-land phenomenon, as solar heating of the land surface usually contributes toward the development of the thunderstorm that spawns the vortex, although over-water tornadoes have occurred. But tropical cyclones are purely an oceanic phenomena. They die out over land due to a loss of a moisture source.
Lastly, tropical cyclones have a lifetime that is measured in days, while tornadoes typically last on the scale of minutes.

foxreno.com

Cyclone expected to miss Bangladesh, hit Myanmar
Dhaka (AP): A cyclone brewing in the Bay of Bengal changed path on Friday and was expected to spare Bangladesh and instead hit Myanmar, Bangladesh’s weather office said.
“The cyclone has turned eastward and is now heading to Myanmar,” weather official Sanaul Huq told The Associated Press. “Bangladesh is out of danger.”
Tropical Cyclone Nargis is expected to hit Myanmar late Friday.
The Bangladesh government said it was still taking no chances and was preparing for the storm’s impact, calling for volunteers to assist in evacuating residents from areas at risk.
“Our volunteers will continue to stay alert and take necessary measures,” said Mollah Waheduzzman, an official at the Ministry of Food and Disaster Management.
At 0600 GMT Friday, Nargis was 720 kilometers (450 miles) south off Bangladesh’s southern Chittagong coast, with a maximum sustained wind speed of about 120 kph (75mph), rising to 140 kph (87 mph) in gusts, the Bangladesh Meteorological Department said.
The department warned that the cyclone could trigger a tidal surge. Fishing trawlers have been asked to keep close to the shore.
Bangladesh, a low-lying nation of 145 million people, is prone to natural disasters such as floods and cyclones. A cyclone killed about 148,000 Bangladeshis in 1991.

hindu.com