Weather Weather DisturbancDisturbanc

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IntroductionIntroductionWhat is a weather

disturbance?• A weather disturbance is a

general term that describes any pulse of energy moving through the atmosphere.  

• They are important in that they can act as focusing mechanisms for storm formation, or even to intensify low pressure systems.

• They are typically mid or upper atmospheric troughs of low pressure that are embedded in the general wind flow of the atmosphere.

ThunderstorThunderstormm

What is a What is a Thunderstorm?Thunderstorm?

• It is a small-scale weather system It is a small-scale weather system in which lightning and thunder are in which lightning and thunder are produced by a funnel-shaped produced by a funnel-shaped cumulonimbus cloud.cumulonimbus cloud.

• It is also known as an electrical It is also known as an electrical storm, a lightning storm, storm, a lightning storm, thundershower or simply storm.thundershower or simply storm.

• It usually produces gusty winds, It usually produces gusty winds, heavy rains, and sometimes hail.heavy rains, and sometimes hail.

• A thunderstorm occurs when the skies A thunderstorm occurs when the skies darken, the wind picks up, lightning darken, the wind picks up, lightning flashes, thunder roars, and static is heard flashes, thunder roars, and static is heard on your AM Radio.on your AM Radio.

• May last for about 30 min. or even a hour.May last for about 30 min. or even a hour.• Plays an important role in the hydrologic Plays an important role in the hydrologic

cycle and general circulation.cycle and general circulation.• Are also engines of tropical disturbance Are also engines of tropical disturbance

that bring a large fraction of that bring a large fraction of the annual rainfall to tropicalthe annual rainfall to tropical

coastal regions.coastal regions.

Examples of Examples of ThunderstormsThunderstorms

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Tropical Tropical CycloneCyclone

What is a Tropical What is a Tropical Cyclone?Cyclone?

• A tropical cyclone is a generic term for a A tropical cyclone is a generic term for a storm with an organized system of storm with an organized system of thunderstorms that are not based on a thunderstorms that are not based on a frontal system.frontal system.

• It is a low pressure system that generally It is a low pressure system that generally forms over tropical ocean areas, and forms over tropical ocean areas, and brings wind and thunderstorms.brings wind and thunderstorms.

• Comes from the Greek word “kyklos”,Comes from the Greek word “kyklos”, which means “coiling snake.which means “coiling snake.

• It rushes in a spiral motion and have a low It rushes in a spiral motion and have a low pressure center called “eye of the storm”.pressure center called “eye of the storm”.

• Tropical cyclones with maximum sustained Tropical cyclones with maximum sustained surface winds of less than 62 km/h are surface winds of less than 62 km/h are called called tropical depressions. tropical depressions. When the When the winds reach 62 km/h, it becomes awinds reach 62 km/h, it becomes a tropical tropical storm. storm. Winds that reaches at least 118 Winds that reaches at least 118 km/h, then they are calledkm/h, then they are called hurricanes hurricanes in in the Atlantic andthe Atlantic and typhoons typhoons in the Pacific.in the Pacific.

• Typhoons are strongest over the ocean Typhoons are strongest over the ocean where they get their energy where they get their energy and weakest in the land.and weakest in the land.

Examples of Tropical Examples of Tropical CyclonesCyclones

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MoonsoonMoonsoon

What is a Monsoon?What is a Monsoon?• The term “monsoon” was from the The term “monsoon” was from the

Arabic word “mausim”Arabic word “mausim” which meanswhich means “seasonal wind”.“seasonal wind”.

• It is a seasonal flow of winds It is a seasonal flow of winds between the Northern and Southern between the Northern and Southern Hemispheres.Hemispheres.

• Monsoons are similar to Windflow.Monsoons are similar to Windflow.

• There are two monsoons system that There are two monsoons system that affect the areas such as “Monsoon affect the areas such as “Monsoon Asia” or in particular the Philippines Asia” or in particular the Philippines and Southeast Asia. These are the and Southeast Asia. These are the Southwest Monsoon or “Habagat” Southwest Monsoon or “Habagat” and the Northeast Monsoon or and the Northeast Monsoon or “Amihan”. “Amihan”.

• Most summer monsoons produce Most summer monsoons produce copious amounts of rain; winter copious amounts of rain; winter monsoons monsoons tend to cause drought.tend to cause drought.

The 2 Monsoon The 2 Monsoon SystemsSystems

1.1. Southwest Monsoon (Habagat)-Southwest Monsoon (Habagat)-- felt during the months of - felt during the months of

June and October.June and October.

2.2. Northeast Monsoon (Amihan)Northeast Monsoon (Amihan)- experienced from- experienced from November to February.November to February.

Examples of MonsoonsExamples of Monsoons

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Intertropical Intertropical Convergence Convergence

ZoneZone

What is Intertropical What is Intertropical Convergence Zone?Convergence Zone?

• Intertropical Convergence Zone Intertropical Convergence Zone (ITCZ) is the meeting place of hot (ITCZ) is the meeting place of hot and cold tradewinds in the northern and cold tradewinds in the northern and southern hemisphere.and southern hemisphere.

• The weather system may trigger The weather system may trigger rain showers, even flash floods in rain showers, even flash floods in affected areas.affected areas.

• It is a belt of low pressure that lies It is a belt of low pressure that lies between the trade winds zone of the between the trade winds zone of the northern and southern hemisphere. A northern and southern hemisphere. A snake-like path and generally near snake-like path and generally near the equatorthe equator

• Sailors usually called this doldrums, Sailors usually called this doldrums, where wind speed and direction are where wind speed and direction are weak and irregular.weak and irregular.

• It is located 5It is located 5°North and 5° South.°North and 5° South.

Example of ITCZExample of ITCZ

Thank You!!!!By:

Marigold F. So(Luna Nightmare)