grade 8 typhoons
TRANSCRIPT
Understanding TyphoonsRain, rain go away….NOT!
tropical cyclonesevery year
20
What is a cyclone?an area of low
atmospheric pressure surrounded by a wind system blowing, in the northern hemisphere, in a counterclockwise
direction.
Northern Hemisphere
What is a cyclone?
HIGH
LOW
What is a cyclone?
What is a cyclone?
Counterclockwise
Tropical Cyclone Categories
Category Maximum Wind Speed in kph
Tropical Depression 64Tropical Storm 118
Tropical Cyclone Categories
Category Maximum Wind Speed in kph
Tropical Depression 64Tropical Storm 118
Typhoon 200Supertyphoon Greater than 200
OMG END OF THE WORLD!!!
1,000,000,000,000,000,000
The PARNear, PAR, wherever you are.
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Where is the PAR?
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Plotting the PAR
Points Latitude Longitudea 5°N 115°Eb 15°N 115°Ec 21°N 120°Ed 25°N 120°Ee 25°N 135°Ef 5°N 135°E
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Activity 1 Questions
Q1. If a typhoon is located at 15o N, 138o E, is it within the PAR?
Q2. How about if the typhoon is at 19o N, 117o E, is it inside the PAR?
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Activity 2 Questions
1. Where did Sendong form?
2. When did Sendong enter the PAR?
3. When did Sendong leave the PAR?
4. In what direction did Sendong move?
Under what conditions do
tropical cyclones form?
Where did the tropical cyclones form? On land or in the ocean?
What can you say about the temperature of the bodies of water in the vicinity of the
Philippines? Is the water warm or cold?
In what direction did the tropical cyclones move?
Which part of the Philippines was hit by the four tropical cyclones?
In the case of Agaton, Yoyong, and Huaning, where did they die out? Near land or in the
middle of the ocean?
Over bodies of water, near the
equator!BUT, Why?
Typhoons need water vapour in
order to form.
ZONE of greatest heating produces LOW PRESSURE
ZONE of least heating produces HIGH PRESSURE
ZONE of least heating produces HIGH PRESSUREHIGH
HIGH
LOW
Temperature of ocean water for
cyclones to develop
26.5°C
Tropical cyclones move in a NORTHWEST direction.
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Tropical Cyclone-
Prone Areas
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Where should a cyclone form so it would hit the Mindanao
area?
jpmartizanohttp://weather.unisys.com/hurricane/w_pacific/2011H/index.php
Why do cyclones die out when they reach
land?
The typhoon has affected some
338,000 people across 13 provinces.
43,000 are seeking refuge in
evacuation centres.
On Friday 16 December Typhoon
Sendong (Washi) hit the southern
Philippines island of Mindanao,
causing flooding that killed nearly
1,000 people.
Typhoon Hits Philippines
Let’s dissect the cyclone!
Parts of a Cyclone
•Eye•Eyewall•Rainbands
Parts of a Cyclone
Eye - lowest air pressure; lowest wind speed;
Parts of a Cyclone
Eyewall – greatest wind speed
Parts of a CycloneRainbands – bring rain showers; pressure increases as it goes farther from the eye
Air pressure in millibars980 930 990 960
930 mb 960 mb 980 mb
990 mb
Wind Speed in km/h10 200
10 km/h 200 km/h
Storm Surge
Are You Prepared?
http://gawker.com/5834445/how-to-prepare-for-a-hurricane
PUBLIC STORM WARNING SIGNALS
A tropical cyclone
will affect
the locality
Winds of 30-60 kph may be expected in at least 36 hours or
irregular rains may be expected within 36
hours
PSWS #1
PUBLIC STORM WARNING SIGNALS
A tropical cyclone
will affect
the locality
Winds of greater
than 60 kph up to 100 kph may be expected
in at least 24 hours
PSWS #2
PUBLIC STORM WARNING SIGNALS
A tropical cyclone
will affect
the locality
Winds of greater than 100 kph to 185
kph may be expected in at least 18 hours
PSWS #3
PUBLIC STORM WARNING SIGNALS
The locality is very
likely to be hit
directly by the eye of
the typhoo
n
Very strong winds of more than 185 kph may be expected in at
least 12 hours
PSWS #4
EMERGENCY KIT
bottled water
ready to eat food
flashlight
EMERGENCY KIT
battery-operated radio
Extra batteries
clothes and towels
EMERGENCY KIT
medicines
toiletries
Cell phone
Useful WebsitesFor added info, YAY!
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nasa.gov
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noaa.gov
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nhc.noaa.gov