Lightning & thunderstorm (Disaster Risk Reduction-Natural Hazards)

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Thunderstorm

is a localized storm

which is

accompanied

with lightning and

thunder and often

brings heavy

rainfall,

hail as well as

strong

gusty winds.

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12,000 m

9,000 m

6,000 m

3,000 m

• Typical thunderstorm

is 5 km. in diameter

• Lasts an average of

30 minutes; although

some may last longer.

• All thunderstorms are

dangerous!!!

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Air mass - Results from surface heating

Considered self-destructive

The Two Types of Thunderstorms

Steady State- associated with weather systems

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Moisture - to form clouds and rain

The Thunderstorm Recipe

Unstable air - warm air that can rise rapidly

Lift - to form clouds and rain caused by cold or

warm fronts, sea breezes, mountains, or the

sun’s heat

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DEVELOPING STAGE MATURE STAGE DISSIPATING STAGE

The Thunderstorm Life Cycle

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Thunderstorm Warning Levels:

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Thunderstorm Warning Levels:

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PAGASA Thunderstorm Warning Levels:

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Thunderstorm Warning Levels:

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Thunderstorm Warning Levels:

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Thunderstorm

Warning

Thunderstorm is

threatening a specific

area within the next 2

hours.

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Heavy Rainfall

Lightning/Thunder

Tornado

Hail

Microburst

Thunderstorms can produce dangerous

weather conditions:

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Hazards Associated by TSTM:

1) Heavy Rainfall

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Payatas Tragedy

Cherry Hill

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Hazards Associated by TSTM: 2) Lightning and thunder

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Hazards Associated by TSTM: 2) Lightning and thunder

The giant spark of electricity

in lightning makes the air very

hot. When the air bumps into

the cooler air around it, this

causes a cracking sound. This

is called thunder.

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HOW THUNDER OCCURS 2/13/2014 10:05:56 AM

Rapid

expansion/

contraction

of the air

causes

thunder

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What

Causes

Lightning

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STEPPED LEADER

STEPPED LEADER

AND

STREAMER

UNITES

STREAMERS

THE LIGHTNING BOLT!

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T-STORM DANGER

Lightning may

extend out to 4 kms.

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5 Ways Lightning Strike People

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5 Ways Lightning Strike People

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5 Ways Lightning Strike People

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5 Ways Lightning Strike People

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5 Ways Lightning Strike People

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5 Ways Lightning Strike People

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Impacts of Lightning

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Go inside a home or large building, if you can.

Avoid using electrical appliances such as cp’s, telephones, computers, or television sets.

If stuck outside, do not take shelter under a tall, isolated tree.

Stay away from bodies of water.

If you are trapped in an open field and you feel your hair stand on end, lightning is about to strike. Do not lie flat on the ground.

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IF THERE IS NO SHELTER AND YOU ARE

CAUGHT IN A THUNDERSTORM . . .

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IF THERE IS NO SHELTER AND YOU ARE

CAUGHT IN A THUNDERSTORM . . .

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3) Tornado - is a localized windstorm characterized

by a visible funnel-shaped, rapidly whirling cloud that

extends from the base of a dark –cumulonimbus cloud.

• Whirling winds are estimated to exceed 450 km/hr and may last for a few

minutes

• Can strike at any time of the day and can leave a mark of destruction.

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What are the signs of impending Tornado?

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HOW

TORNADOES

FORM

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Formation of Tornadoes

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Historical Tornado

Occurrences in the

Philippines (1994-2005)

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UNROOFED HOUSES WITH TOTALLY DAMAGED

HIGH RISK HOUSES UNROOFED SCHOOL BUILDING CAUSED BY

STRONG WINDS OF THE TORNADO SCHOOL BUILDING SLASHED INTO HALF

BY THE TORNADO

DAMAGES DUE TO TORNADO

OCCURRENCE OVER KALIBO CITY

(August 15, 1998)

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A waterspout is just a weak tornado that forms over water.

What is a waterspout?

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What is a waterspout?

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A waterspout is just a weak tornado that forms over water.

What is a waterspout?

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Fair Weather Water Spout

Tornadic Water Spout

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What is a waterspout?

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What is a waterspout?

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What is a waterspout?

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4) Hail Chunks of ICE from the sky

Hazards Associated by TSTM:

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4) Hail

Hazards Associated by TSTM:

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small balls of ice and

hardened snow that

fall like rain

Hailstorm

A storm that includes

the downpour of hail.

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Hail Formation

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Hazards Associated by TSTM:

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MICROBURST

A microburst

is a very localized

column of sinking

air, producing

damaging

divergent and

straight-line winds

at the surface.

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MICROBURST

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