- Once a tropical storm has reached sustained winds of 73 miles per hour or 64 knots per hour, the storm is classified a typhoon.
- After that, there are only two divisions: severe typhoon and super typhoon.
- A severe typhoon has sustained winds of at least 95 miles per hour or 80 knots and a super typhoon has sustained winds of at least 115 miles per hour or 100 knots.
- Typhoons begin over warm water and in humid air between 10 and 20 degrees latitude north in the Pacific Ocean.
- As warm air rises from the surface of the water, less air is left and a low pressure area develops.
- This area of low pressure pulls in the air around it.
- As the air comes in, it warms up and begins to rise.
- Clouds begin to form as the air cools because of its elevation and soon the system begins to rotate.
- If conditions are favorable, especially the temperature of the water, then the system grows and eventually an eye will form.
- If the water temperature drops below 79 degrees Fahrenheit, the storm will weaken.
- The typhoon will also dissipate if it moves over land.
- Hooghly River, India and Bangladesh: 1737 - 300,000 deaths.
- Coringa, India: 1839 - 300,000 deaths.
- Backerganj, Bangladesh: 1876 - 200,000 deaths.
- Haiphong, West Pacific: 1881 - 300,000 deaths.
- Great Bhola, Bangladesh: 1970 - 500,000 deaths.
An example of a typhoon was Typhoon Songda which reached the Northern Mariana Islands and Japan in 2004 with winds up to 145 miles per hour.
- Some of the countries that experience typhoons: Guam, Marianas Islands, Philippines, Taiwan, southern China, South Korea, southern Japan and Vietnam.
- Before a typhoon hits, there are large waves, falling barometric pressure and a storm surge.
- As it is getting nearer, the winds will get stronger and large numbers of cumulus clouds appear.
- When the typhoon hits, there will be torrential rains and high winds.
- Typhoons and hurricanes in the northern Hemisphere spin in a counter clockwise direction.
- The eye of the storm can be between 5 and 25 miles wide.
Origin of typhoon
- Alteration (influenced by Chinese terms for typhoons, perhaps Cantonese toi2fung1 typhoon, and kindred terms) of earlier English tuffon, tufan deluge from Hindi and Urdu tūfān storm of wind and rain, flood from Arabic ṭūfān deluge from Greek tuphōn Typhon, whirlwind
From American Heritage Dictionary of the English Language, 5th Edition
- Probably ultimately of Sinitic origin, Mandarin å¤§é£Ž (dÃ fÄ“ng, “big wind"), Cantonese å¤§é¢¨ (daai6 fung1, “big wind"), via Arabic Ø·ÙˆÙØ§Ù† (á¹Å«fÄn), Hindi à¤¤à¥‚à¤«à¤¼à¤¾à¤¨ (tÅ«fÄn), and Persian ØªÙˆÙØ§Ù† (tufÃ¢n). Given the location of typhoons as a Pacific Ocean phenomenon, it is more likely it began east and moved west. Ancient Greek Î¤Ï…Ï†á¿¶Î½ (TuphÅn, “Typhon, father of the winds") is unrelated but has secondarily contaminated the word.