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Weather Maps


Lea

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es How is weather shown on a map?

What are synoptic charts?

What do satellite images show us?


What’s the weather like?


Weather maps


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Pressure is shown in millibars.

Isobars are lines joining areas of equal pressure.

LOW

Pressure is decreasing towards the middle. This is a low pressure system.

Synoptic charts are charts of surface pressure. They help meteorologists predict the weather.

Synoptic charts


What type of pressure system is shown on this chart?isobars

HIGH

This is a high pressure system. The pressure is increasing towards the centre.

Synoptic charts


Wind Speed (mph)

Cloud Cover (oktas)

Precipitation

Weather Symbols


1. Is this a low or high pressure system?2. Describe the weather at A, B and C.

AB

C

Synoptic charts


Weather symbols


Match the statements to the correct letter/s.

Low Pressure

High Pressure

Clear Sky

A

B

C

D

E

F

Rain Shower

Drizzle

Northerly winds

Overcast North westerly winds

Wind speed 8-12 mph

Wind speed 18-22 mph

G


Build your own weather map


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High pressure system 2nd May 1990 midday

Satellite cameras detect heat and light from the Earth.

Visible satellite images record light from the sun, reflected back to the satellite by cloud tops and land and sea surfaces. They are equivalent to a black and white photograph from space.

Visible satellite images can only be taken during the day.Why is this?

Satellite images


The infrared satellite images record the heat that is given off by an object. The coldest objects such as fronts and high clouds show up the whitest.

Both of these satellite images were taken at midday.

Satellite images


high clouds around the Equator (cold therefore shown as white)

cloud-free Sahara (warm therefore shown as dark)

Infrared satellite images


Satellite images are used to predict and track the weather.Look at the satellite image of a depression in January 1990.

25th Jan 1990 03.29 GMT

The centre of the depression can be recognised by a swirl of cloud.

The line of continuous cloud from this centre marks the line of the fronts.

The white dots at the rear of the depression mark the shower clouds.

Depression – January 1990


Depression – January 1990

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