How do we measure and forecast the

weather?

Radar images can detect areas of rainfall and how heavy it is.

RAINFALL

The heaviest rainfall is shown in red, green, yellow with blue

being the lightest.

RAINFALL

AIR PRESSURE

Warm Front

Isobars

Wind blows from high to low pressure

WIND DIRECTION AND STRENGTH

Moderate south easterly winds bringing warm, dry air

TEMPERATURE

WEATHER SUMMARY

A

B

C

D

E

Ridge of High

Pressure

Trough of Low Pressure

Warm Front

Cold Front

Occluded Front

•These images come from geostationary satellites. •They record visible 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. •However, visible pictures can only be made during daylight hours.

Satellite Imagery

•The infrared image shows the invisible infrared radiation emitted directly by cloud tops and land or ocean surfaces. •The warmer an object is, the more intensely it emits radiation, thus allowing us to determine its temperature. •Cooler temperatures show as lighter tones and warmer as darker.•Lighter areas of cloud show where the cloud tops are cooler and therefore where weather features like fronts and shower clouds are. •The advantage of infrared images is that they can be recorded 24 hours a day.

Infra Red Imagery