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Monday, 24 November 2014
  
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  Home - General Forecasting Division - Data Collection - Space Based

 

General Forecasting Division

Data Collection - Space Based
SATELLITE
Visible Satellite


This visible satellite image measures the sunlight reflected by the Earth’s surface and clouds. Clouds and snow reflect a lot of light and are bright; the oceans absorb almost all incoming light and are dark; thin or low clouds and land have variable reflectivity’s or albedos, and are varying shades of grey. The earth is scanned every 15minutes by the new MSG geostationary satellite which is located over the Equator at 0 degrees W. Images are available here at 1200 all year round, and also at 0600 and 1800 from Spring to Autumn. VISIBLE SATELLITE IMAGE

Infra-red Image
The infra red satellite image measures the temperature or radiance of the ground and clouds. Light shades represent low temperatures and dark shades high temperatures. The Earth is scanned every 30 minutes by the MSG geostationary satellite which is located over the Equator at 0 degrees W. Images are available here at 0000, 0600, 1200 and 1800. INFRA-RED SATELLITE IMAGE

RADAR
Radar
There are currently operational radars at Dublin and Shannon Airports and also one in Belfast. Electromagnetic pulses of wavelength 5.6cm are sent out and the time taken for them to return is measured. They are reflected by precipitation. A composite picture of the precipitation over Ireland is created every 15 minutes. RADAR IMAGE


 
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