3.1.1.3 Weather Hazards Flashcards
what is global atmospheric circulation
movement of air across the planet which occurs in a specific pattern
high-pressure system way to remember
happy weather
low-pressure system way to remember
lashing down
high-pressure features
cool air descends
reduces cloud formation
light wind and settled weather
air moves clockwise
low-pressure features
hot air rises
the air evaporates and condenses to form cumulonimbus clouds
rain
air moves anti-clockwise
ferrel cell
30-60
hadley cell
0-30
polar cell
60-90
which directions do trade winds move
towards areas of low pressure/away from areas of high pressure
how are low-pressure areas caused
air is rising from the ground so the weather is unsettled
how are high-pressure areas caused
air is descending so the weather will be settled
three names for tropical storms
cyclones, typhoons and hurricanes
countries affected by a cyclone
india, madagascar, australie
countries affected by a typhoon
japan, south-east asia, phillippines
countries affected by a hurricane
carribean, usa
where do hurricanes get their energy from
warm seas
what temperature do seas need to be for hurricanes to develop
27+
what degrees north of the equator do hurricanes form
8+20
three areas of the tropical storm
eye, eye wall, banks of clouds
eye conditions
small area in the middle of the storm
cool air sinks and warms up
no clouds
calm conditions
eyewall conditions
tall bank of clouds
strong wind, heavy rain, thunder and lightning
bank of cloud conditions
either side of the storm
banks of clouds with thunderstorms
strong gusty winds and heavy rain
how do tropical storms form
strong upward movement of air draws water vapour up from the ocean
air condenses and releases heat which draws up more water
storm develops an eye where air descends rapidly
evaporated air cools as it rises to form thunderstorm clouds
several thunderstorms join together
when winds are 75mph+ it is a tropical storm
carried across the sea by prevailing winds
monitoring +prediction advantages and disadvantages
warning to evacuate
technology is better so predictions are more accurate
not always accurate
future track is uncertain
ways to monitor and predict
hurricane watch
hurricane warning
protection advantages and disadvantages
reduces flood effects
people feel safer
expensive
have to travel far to a cyclone centre
ways to protect
storm drains
sea walls to protect storm surges
cyclone shelter
houses on stilts
planning advantages and disadvantages
people know how to respond
responsibility is your own
some people may not leave
storm path may change
ways to plan
bangladesh have early warning systems
rural areas can be reached by bike messenger
hurricane preparedness week
weather definition
atmospheric conditions over a short period of time
climate definition
average weather conditions over a long period of time
examples of weather hazards
strong winds, thunderstorm, drought, heavy snow, prolonged rainfall
prolonged rainfall
rainfall over a long period of time can lead to floods, common when snow melts
thunderstorms
electrical storms with lightening strikes and/or torrential rainfall
strong winds
can occur due to the remains of hurricanes in the Caribbean travelling over the Atlantic due to prevailing winds
heavy snow
freezing temperatures lead to snow and ice cover, lowers visibility and makes roads dangerous
