Transcript Chapter 15: Weather

15 Weather
How to read and understand weather maps and
their symbols
How to identify jobs that rely on weather maps
How to identify weather systems displayed on
weather maps
Wind radar charts and rose diagrams
Chapter 15: Weather
 Weather maps are used by various
people and are produced for different
purposes:
 Daily and simplified weather maps are
available in the papers and on television.
These help people to prepare for the days
ahead
 Detailed forecasts are available and are
crucial for people working on ships and for
pilots
 Farmers also use weather forecasts to help
them prepare work for the next day as
harvesting cannot be attempted unless a
dry spell is forecasted
Chapter 15: Weather
Meteorology
 The study of the atmosphere, especially weather conditions
 Synoptic charts:
 Front:
 Air mass:
 Barometric pressure:
 Isobars:
 Millibars:
 High pressure:
 Low pressure:
Weather map or chart
Boundary between two air masses
(Warm front and cold front)
Body of air with same
temperature/conditions
Same as atmospheric pressure – the
state of the atmosphere
temp/air/movement etc.
Lines that join areas of equal
pressure
Unit of measurement of pressure
AKA Anticyclone or Highs ***
AKA depression or Lows ***
Warm front:
• Warm air is lighter so it rises =
light drizzle / rain
Cold front:
• Cold air forces its way
under warm air forcing it
to rise quickly =
• Bursts of heavy rain
Occluded front:
• A cold front travels
quickly and forces a
warm front to rise =
• Cloud cover and rain
The symbol of a front tells you
what direction the front is
passing and its name tells you
of the air mass behind the line
of the symbol
Low atmospheric pressure:
• Unsettled weather
• Cloud cover
• Precipitation
• Strong winds
High atmospheric pressure:
• Settled weather
• Clear, cloudless skies
• Light winds
• Cold, frosty nights in winter
The colours show the
wind strength /speed
The ‘arms’ show the
direction the wind was
blowing from……