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Isobar
 Hurricane – The central eye region and spiralling clouds show well from space. Notice how the central region (where the air is rising most strongly) has some of the tallest clouds.
 Hurricane – Infra-red and false-colour satellite images help reveal a pattern of weather that cannot be seen by eye. Here the intensity of rainfall is shown in colour, with yellows and reds indicating places where intensity is greatest.
Ice crystals
Also known as snowflakes, they are small particles of ice that usually form in clouds when temperatures in the cloud drop too low for water to remain liquid. The temperature at which ice crystals form depends on the air pressure. High up in a cloud, temperatures are well below 0°C.
Icelandic low
The part of the atmosphere between Iceland and Greenland, in the North Atlantic Ocean, where low pressure systems, or depressions, are formed, or where they grow stronger. It is strongest in winter.
Indian summer
Used in the mid-latitudes to
describe an autumn interlude of good, warm, summer-like weather. The expression is borrowed from the climate of the Indian subcontinent, where sunny, warm weather in September and October follows a period of heavy rain.
Inversion
The opposite of the normal way in which air gets cooler with height. In an inversion the coolest air is near the ground, and the warmer air is higher up.
Isobar
A line drawn on a weather
chart (see: Synoptic chart) to represent places having the same atmospheric pressure.
You can think of isobars as invisible shapes in the air. The
closer together the isobars are, the steeper the slope of pressure in the air, and the faster the air will flow from high pressure to low pressure. The faster the air flows across isobars, the stronger the wind will be. As a result, isobars can help predict where regions of strong winds will occur.
 Isobar – Isobars are lines of equal pressure on synoptic charts marking areas of highs and lows.
LOW
LOW
Sydney
HIGH
500 km
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