Transcript weather - ＊保良局何壽南教育服務中心＊

dictionary
– Typhoon
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–
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Lightning
Rainstorm
Tsunamis
Tornadoes
Blizzards
Hurricane
Spring
Summer
Windy
Cloudy
Sunny
– Waterspout
– Snowy
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Hot
Cool
Cold
Warm
Rainy
Dry
Autumn
Winner
Wet
Fog
• Cumulonimbus
Typhoon
Tropical cyclones normally occur during the months of May to November, and
are particularly prevalent during September.
Tropical cyclone advisory bulletins and/or warnings are issued by the Hong Kong
observatory whenever a tropical cyclone centres within 800 km of Hong Kong
poses a threat to the territory.
These advisory bulletins include the tropical cyclone warning signal issued and
its significance, the latest position and expected movement of the centre of the
tropical cyclone, information on the wind strength, rainfall and sea level in the
territory and advice on precautionary measures.
• Lightning is the
working project
name for an
extension to tightly
integrate calendar
functionality
(scheduling, tasks,
etc.) into
Thunderbird.
• Rainstorm Warning Signals
• When the Amber Rainstorm Warning
Signal is issued, it gives alert about
potential heavy rain that may develop
into Red or Black Rainstorm Warning
Signal situations. There will be
flooding in some low-lying and poorly
drained areas.
• The Red signal means that heavy rain
could cause serious road flooding and
traffic congestion, and may affect
schools and public examinations.
• The Black signal means that there are
major disruptions and inclement
weather. The public will be given clear
advice on the appropriate actions to
take.
• Tsunamis, also called
seismic sea waves or,
incorrectly, tidal waves,
generally are caused by
earthquakes, less commonly
by submarine landslides,
infrequently by submarine
volcanic eruptions and very
rarely by a large meteorite
impact in the ocean.
Submarine volcanic
eruptions have the potential
to produce truly awesome
tsunami waves.
Tornadoes are one of nature's most violent
storms. In an average year, about 1,000
tornadoes are reported across the United
States, resulting in 80 deaths and over 1,500
injuries. A tornado is a violently rotating column
of air extending from a thunderstorm to the
ground. The most violent tornadoes are capable
of tremendous destruction with wind speeds of
250 mph or more. Damage paths can be in
excess of one mile wide and 50 miles long.
• Blizzards are characterized
by low temperatures
(usually below 20°F)
and accompanied by winds
that are at least 35 mph or
greater, there must also be
sufficient falling and/or
blowing snow in the air that
will frequently reduce
visibility to 1/4 mile or less
for a duration of at least 3
hours.
A hurricane is a severe tropical storm that forms in the North Atlantic Ocean, the
Northeast Pacific Ocean east of the dateline, or the South Pacific Ocean east of
160E. Hurricanes need warm tropical oceans, moisture and light winds above
them. If the right conditions last long enough, a hurricane can produce violent
winds, incredible waves, torrential rains and floods.
When hurricanes move onto land, the heavy rain, strong winds and heavy
waves can damage buildings, trees and cars. The heavy waves are called a
storm surge. Storm surge is very dangerous and a major reason why you MUST
stay away from the ocean during a hurricane.
A waterspout is a fast rotating
column of air (made visible by
water droplets in the cloud)
extending from the base of a
convective cloud to the water
surface. It is equivalent to a
tornado, which occurs
over land. A rotating column of air
which does not touch the surface
(water or land surface) is called a
funnel cloud.