Stages of Hurricane Development…

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Presentation transcript:

Stages of Hurricane Development… 1. Tropical Disturbance: The first stage is a collection of thunderstorms forming in the easterly flow over warm tropical waters with only slight rotation. 2. Tropical Depression: Next, the storm develops a well-defined centre of low pressure with winds of 37 to 62 km/h. 3. Tropical Storm: Next, the storm becomes an intense centre of low pressure and carries winds of between 63 and 117 km/h. 4. Hurricane: When the wind speeds are 118 km/h and higher, the storm is considered a hurricane.

Features of a Hurricane… Eye: The major feature within a hurricane is the eye, a small region of relatively calm and clear air in the centre, 15 kilometres or so across. Eyewall : The eye is surrounded by clouds that make up the eyewall; here the weather is most severe with high winds and heavy precipitation. Spiral Rain Bands: Feeding into the wall cloud region are spiral bands of clouds, often composed of strong thunderstorms.

Damage from a Hurricane… Hurricanes are especially damaging because of 2 things: 1. Storm Surge: 90% of hurricane deaths are due to high water rather than high winds. Due to the low pressure and strong winds, hurricanes create a huge mound of water called a storm surge (especially in shallow coastal waters) If the surge occurs during a high tide, the increase in water level can be as much as six metres. Large-scale evacuations of people from low-lying areas prevent massive loss of life due to such flooding.

Damage from a Hurricane… 2. Wind Damage: Hurricane winds have been recorded at speeds up to 300 km/h. Beyond the damage caused directly by such winds, wind-driven waves on top of the storm surge compound the flooding problem by battering and eroding coastal features.

Weather Warning Systems… In order to lessen the impact severe weather can have, we have a warning system in place to help people make decisions with respect to weather: Severe Weather Watch: Conditions are present for extreme weather to occur in your area, so you should pay attention to further news updates. Severe Weather Warning: Extreme weather is highly likely to arrive somewhere in your area or may already be happening, so you should take appropriate precautions. Lightening Bolt Calculation: Every 3 seconds is equal to 1 km or 5 seconds is equal to 1 mile.