When it did come, it was very good but for some reason others produced not a sausage.
Most likely there was no rain in them. Weather radar can only detect water droplets. If there's no water droplets in a cloud pattern, there's no return. Wx Radar isn't magic, it has to be used actively and the results interpreted, but sometimes you just don't get the data you expect.
On one occasion I was called to an aircraft departing in heavy tropical rain that returned to the stand with a weather radar defect. The pilot complained that his display was completely red. I turned the range up to 130 miles and it showed the presence of a heavy rain cell extending out to about 60 miles from the coast.
After he'd been gone the regulation thirty minutes I was able to go home for a change of clothes.
