WS 1 P.2-7 Flashcards
what kind of pressure system does a typhoon belong to?
a low-pressure system.
what are the conditions required for the development of a typhoon?
warm ocean water of ≤ 26.5°C
still, smooth surface
abundant supply of water
what makes a typhoon die down?
insufficient water
friction with building and mountains on land
what is the effect of how a typhoon rotates around their centres called?
Coriolis effect.
Why does a typhoon rotate around its centre?
This is because of the Earth’s rotation.
What is the centre of a typhoon called?
an eye
The pressure is the _______________ in the eye.
lowest
typhoons rotate ________________/________________ in the ________________/________________ hemisphere.
clockwise, southern; anti-clockwise, northern
what are the stages of a typhoon?
origin—>mature—>dissipation
how were our daily lives affected when Typhoon Hato stroke Hong Kong? —losses —flight —suspension —disrupted —triggered —caused —disrupted —caused
losses of major sectors flight cancellations suspension of public transport disrupted power supplies triggered secondary hazard caused trees to fall, which blocked roads and stopped traffic disrupted economic activities caused death and injuried
warning signals that may be issued under a typhoon’s influence: — — — — — —
typhoon no. 1/3/8/9/10
special announcement of flooding in the northern New Territories
thunderstorm warning signal
landslip warning signal
rainstorm warning signals (amber/ red/ black)
Typhoons are a type of ________________ natural hazard.
climatic
negative impacts of rainstorms:
—
—
—
traffic congestion (disrupts traffic)
causes flooding
landslides
negative impact of typhoons: — — — —
disrupts economic activity;
transport and people’s daily lives
causes injuries, and loss of life and property
triggers other natural hazards
‘weather’ refers to ________________ ________________, while ‘climate’ refers to ________________ ________________, like ________________
shorter periods
longer periods, seasons’
please name the key elements of weather and climate. (10 in total)
relative humidity amount of sunlight air pressure wind direction wind speed precipitation type precipitation amount temperature extras: air quality UV index
what does the Hong Kong Observatory do?
- provide
- issue
- monitor
- educate
—the public, the government, the airport and the harbour with accurate information about weather conditions.
—warning signals under extreme weather conditions
—and record the weather conditions
—the public on weather related issues
Why is it necessary to set up the Hong Kong Observatory?
—
—
to safeguard our life and property
to minimise disruptions to economic and social activities during inclement weather
name the 9 common warning signals issued by the Hong Kong Observatory.
thunderstorm warning signal, landslip warning signal, special announcement on flooding in the northern new territories, very hot weather warning, cold weather warning, red rainstorm warning signal, typhoon signal number 8, yellow fire danger warning signal, strong monsoon warning signal
action to be taken in the presence of the thunderstorm warning signal:
avoid or cancel outdoor water sports.
action to be taken in the presence of the landslip warning signal:
people should avoid walking or driving close to steep slopes
action to be taken in the presence of the special announcement on flooding in the northern new territories:
stay away from low-lying areas.
action to be taken in the presence of the very hot weather warning:
avoid exposure under the sun for too long.
action to be taken in the presence of the cold weather warning:
put on more clothes.
