TYPHOON

• Forms when winds blow into areas of the ocean where the water

  is warm?

  Typhoon
• What does PAGASA stand for?


  Philippine Atmospheric Geophysical and Astronomical Services Administration
• From what words does the word typhoon come from?

  Tropical and cyclone
• What does tropical mean?

  Refer to its geographical starting point.
• What does cyclone mean?

  A meteorological term which refers to its cyclonic circulation where the strong winds in the Northern Hemisphere circulate counter-clockwise and clockwise in the Southern Hemisphere.
• What do typhoons start off as?

  Tropical thunderstorms
• What does the strong winds do?

  They pull in moisture from the ocean.
• The thunderstorms convert the moisture into _?

  Heat
• What is low pressure area (LPA)?


  A region on the topographic map where the atmospheric pressure is lower than that of surrounding locations.
• What are the six factors that affects the development of the typhoon?

  Sea surface temperature (SST), unstable atmosphere/vertical motion, relative humidity, pre-existing condition, wind shear, and Coriolis effect
• What is the SST?


  26.5 °C
• What is an unstable atmosphere?

  Defined by one in which warm air continues to rise until it finds itself surrounding by air of an identical temperature.
• What is relative humidity?

  The amount of moisture available in the atmosphere. High values of RH need to be present from the lower to middle portions of the atmosphere.
• What is pre-existing condition?

  It may begin as a simple thunderstorm, but some form of disturbance or an area of lower pressure relative to its surroundings.
• What is wind shear?

  The change in wind speed/direction with height. These changes in wind direction with height must be enough to sustain a counterclockwise flow.
• What is the Coriolis effect?

  A force that results from the Earth's rotation. It induces motion to the right and to the left.
• What are the parts of a typhoon?


  Eye, inner bands, outer bands, and edge
• What is the eye?

  At this part, the weather has no rain but a sunny sky.
• What is the inner band?

  The rain is harder but the wind is weaker.
• What is the outer band?

  The rain is weaker but the wind is stronger.
• What is the edge?


  Both winds and rains have the same power.
• Tropical cyclones __ when they hit land?

  Weaken
• What do tropical cyclones need to keep them going?

  Water vapor
• A tropical cyclone is also called?

  Typhoon or hurricane
• What are the categories of tropical cyclones?

  Tropical depression (TD), tropical storm (TS), severe tropical storm, typhoon (TY), and super typhoon (STY).
• Wind speeds of TD?

  55-64 KPH
• Wind speeds of TS?

  65-119 KPH
• Wind speeds of TY?

  120-170 KPH
• Wind speeds of Severe Typhoon?

  171-220 KPH
• Wind speeds of STY?

  Above 220 KPH
• Signal No. 1?

  30-60 KPH in at least 36 hours
• Signal No. 2?

  61-120 KPH in at least 24 hours
• Signal No. 3?

  121-170 KPH in at least 18 hours
• Signal No. 4?

  171-220 KPH in at least 12 hours
• Signal No. 5?

  Above 220 KPH in at least 12 hours
• What is cold waters?

  The absence of moisture from warm ocean waters. The absence of a typhoon's fuel source.
• What is no water?

  A typhoon will drastically deteriorate once its eye moves over the land. The air over land cools quickly due to the specific heat causing the typhoon to lose intensity.
• What is wind shear?

  Differences between the speed shear or wind speed and its directional shear over a relatively short distance within the atmosphere.
• Where is the lowest air pressure located at?

  Eye of a tropical cyclone
• If the wind speed is low at the eye, the wind speed of the eye wall is?

  Great