what causes a typoon to form?
148092
Wikipedia has a good answer: http://en.wikipedia.org/wiki/Tropical_cyclone\n\nin addition:\n\nhttp://www.britannica.com/eb/article-67118\n\nFormation of tropical cyclones\n\nTropical cyclones represent still another example of sea-air interactions. These storm systems are known as hurricanes in the North Atlantic and eastern North Pacific and as typhoons in the western North Pacific. The winds of such systems revolve around a centre of low pressure in an anticlockwise direction in the Northern Hemisphere and in a clockwise direction in the Southern Hemisphere. The winds attain velocities in excess of 115 kilometres per hour, or 65 knots, in most cases. Tropical cyclones may last from a few hours to as long as two weeks, the average lifetime being six days.\n\nThe oceans provide the source of energy for tropical cyclones both by direct heat transfer from their surface (known as sensible heat) and by the evaporation of water. This water is subsequently condensed within a storm system, thereby releasing latent heat energy. When a tropical cyclone moves over land, this energy is severely depleted and the circulation of the winds is consequently weakened.\n\nSuch storms are truly phenomena of the tropical oceans. They originate in two distinct latitude zones, between 4° and 22° S and between 4° and 35° N. They are absent in the equatorial zone between 4° S and 4° N. Most tropical cyclones are spawned on the poleward side of the region known as the intertropical convergence zone (ITCZ).\n\nMore than two-thirds of observed tropical cyclones originate in the Northern Hemisphere, and roughly the same proportion occur in the Eastern Hemisphere. The North Pacific has more than one-third of all such storms, while the southeast Pacific and South Atlantic are normally devoid of them. Most northern hemispheric tropical cyclones occur between May and November, with peak periods in August and September. The majority of southern hemispheric cyclones occur between December and April, with peaks in January and February.\n\n\n---------------------------------------------\n\nTyphoon is a tropical cyclone located in the western north Pacific basin (between 100E and 180E in the northern hemisphere). The category of a typhoon is decided by the maximum sustained winds, but please note that the typhoon in Japanese standard and the typhoon in international standard is not the same. Finally, among tropical cyclones in the world, the typhoon is the most frequent and the strongest tropical cyclone (http://agora.ex.nii.ac.jp/digital-typhoon/help/world.html.en)\n------------------------------------------------------\n\nhttp://www.taiwanho.com/modules.php?op=modload&name=News&file=article&sid=205\n\nTyphoons (called hurricanes in the Atlantic and East Pacific, and cyclones in the Indian Ocean and around Australia) are the worlds most violent and destructive storm systems. Around 17 typhoons form annually in the West Pacific, of which around one third make landfall. They are giant whirlwinds, with air circulating around an area of low pressure, and high winds extending about 100km from the centre.\n\nMost typhoons form between 5-30 degrees latitude, and 110-180 degrees longitude. Typhoons that form in the east of this region can travel for long distances without being affected by landmasses. This gives them plenty of time to build up their strength. Hence, the very strong and long lasting supertyphoons tend to form closer to the date line. Sea surface temperatures in the Nino 4 region (5S-5N, 160E-150W) affect the longitude at which typhoons tend to form. Warm sea surface temperatures in this region result in more typhoons forming closer to the date line.\n\nSome prerequisites for typhoon formation are listed below:\n\n1. Sea surface temperatures greater than 26C to a depth of 60m. This provides the moisture for the thunderstorm activity in the storm.\n\n2. A large enough drop in temperature with height so that the atmosphere is conditionally unstable to
74957
Drink a lot of water that's what causes this!!
1005699
The same thing that causes prizms in crystals.  It is the colors of light, the rain condenses them just as the crystal does
1174208
There is no known cause; is appears and then diappears seemingly out of nowhere. It should NOT leave any permanent marks. I am not sure if you can get it again later in life.
1099766
It could be an iron deficiency but sometimes it is caused by teh rapid growth of a growth spurt or something you will either grow out of it or need to get more iron in your diet.
827682
where the precipitate is formed you have a chemical reaction because the precipitate signals it, there are also color changes and temp changes that can signal to you that it is a chemical raction.\n\n\nthe other one is a physical reaction
239637
Sounds like you have a virus if its just been recently.  If this occurs often maybe even food poisoning or something you are eating.  You should see a doc if it has occured often
630192
I have never heard of this happening. You should go to your regular dr., who can refer you to a specialist, if needed. I have heard of people being able to tell if it is going to rain due to their arthitis flaring-up and if they get a headache. Something about the barametic pressure. I believe that it would be well worth it for you to find out exactly why this happens to you. Good Luck!
424581
The body needs fiber, water, and exercise to stimulate peristalsis (the wave like contractions that move the fecal matter down) in a healthy manner. If your body was previously used to high fat foods then the peristalsis may have been happening due to the irritation of the lining of the GI tract.\n\nThe best thing you can do...drink more water and either add some fiber to your diet or take a fiber supplement!\n\nGood Luck\n\nPost back if you need additional information
332583
It causes them to combine, seperate, or agglutinate.
585097
Moisture forms on things, whether it's morning dew, or heavy fog, or rain.  If there isn't enough moisture for rain, dew forms.
190192
HEAT MAKES YEAST RISE\nCOLD KEEPS IT
287552
excitement causes it.\nits a lubricant\nyour lubricant porthole is set a little closer to your opening than normal.
397358
when your red blood cells die, they are pooed out of the body. this is what makes your poo brown!
168112
it really depends on the structure of the starch (powder, or glutenous)..it helps if the water is very cold and added to the starch slowly while stirring, you can get the two to "mix" though I believe it is a coloidal in nature.
350047
The first two factors that came to mind when I read this question have already been mentioned (surface tension and viscosity).  However,  I would describe the effect a bit differently.\n\nSurface tension provides the major cause of a liquid dribbling down the side rather than pouring cleanly from a container.  Surface tension is created by a weak bond between the molecules in the liquid and causes the molecules to form a continuous mass of particles.  Imagine water being slowly poured from a near-full glass into a small-mouthed container.  As the glass is tilted, the water slowly rolls over the lip of the glass and tends to roll down the side of the glass.  This is because the surface tension of the water is acting to keep a continous body of water and the slight angle of the glass reduces the effective force of gravity pulling the water away from the surface of the glass.  The forces pulling the liquid away from the glass are not strong enough to overcome the surface tension of the water.  The water adheres to itself, and to the glass, and streams down the side.  \n\nAs the glass is tilted further, the speed of the water exiting the glass increases and effect of gravity is increased due to greater angle of the glass with respect to the ground.  The greater forces pulling the water from the glass cause the surface tension in the water to begin to fail, and some of the water pours away from the glass, while some of the water continues to run down the side.  \n\nWhen the glass is fully inverted, the water exits the glass at maximum speed and the full effect of gravity pulls the water away from the glass.  The surface tension of the water is overcome and the water exits cleanly from the glass.  \n\nThe only effect that viscosity has on this is that high viscosity liquids pour much more slowly and the momentum effect is greatly reduced.  Thus, a greater angle is often needed to increase the gravitational effect and overcome the surface tension.
768691
Could be an infection.