Tropical Revolving Storms Flashcards

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1
Q

How is magnitude measured?

A
  • on Saffir Simpson scale (1-5)

- based on: central pressure, wind speed, storm surge, damage potential

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2
Q

Which direction do tropical storms tend to move in?

A

Westwards

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3
Q

What temperatures does the sea need to be?

A

Above 27°C

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4
Q

What does heavy rainfall sometimes exceed?

A

200-300mm

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5
Q

When is the National Guard in the USA called in?

A

To prevent homes and commercial properties from being looted

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6
Q

What type of pressure system are tropical storms?

A

Low-pressure system

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7
Q

Where do they develop?

A

In the tropics

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8
Q

What speed do winds often exceed?

A

150km/hr

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9
Q

What 2 conditions are needed for a tropical storm to exist?

A
  • supply of latent heat

- moisture

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10
Q

What depth must the ocean be and why?

A
  • at least 70m

- moisture provides latent heat to power the storm

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11
Q

How many storms develop yearly, and how many become tropical storms?

A
  • 80-100

- 80%

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12
Q

What is the average lifespan of tropical storms?

A

7-14 days

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13
Q

How much does it cost in USA to evacuate a km of coastline?

A

$1 million per 1km

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14
Q

Why do tropical storms form where they do? (in relation to equator)

A
  • centripetal force is weak near eqauator

- and centripetal force is needed to spin the storm

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15
Q

What is the location of where tropical storms form? (in relation to the equator)

A
  • 5-20 degrees North or South of the equator
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