![]() ![]() ![]() Ranges can be difficult and you should take great care in using these images. As a result, the radar image will not show any rainĮven though at the ground level it may be raining at the time.ĭue to the reasons described above, interpreting the radar images at extended In winter especially, the rain clouds can be below the radar beam at aĭistance of more than 200 kilometres from the radar, and hence the radar beam Raindrops at a height of 3 kilometres from rain that is 200 kilometres away, andĪt a height of around 7 kilometres at a distance of 500 kilometres from the Surface from rain that is 100 kilometres away from the radar. Radar beam detects raindrops at a height of 1 kilometre above the Earth's Of the Earth's curvature, and partly because the beam is angled upwards by aįraction of a degree), thereby missing the lower parts of the rain. The intensity of echoes tends to decrease with increasing distance from theĪ) The radar beam broadens with distance, thus decreasing the proportion of theīeam which is filled with rain, which reduces the echo intensity ī) The radar beam becomes further from the ground with distance (partly because ![]() The effects of the curvature of the earth on weather radar.ġ. The Images Why is the radar showing no rain when it is raining where I am? ![]()
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