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kemp90 said..
We had a hail storm a few weeks ago. On the radar it was black in the center. I never seen black be for.
+1 for black on the radar, also dark red but the weather radar has limitations.
They tend to beam out towards the horizon, rather than up. So closer in they give radar images of rain as it get close to the ground, and then because of the curvature of the earth as you get further out up to 250km or so it will only show higher altitude rain or moisture up in the clouds (neither of which might hit the ground).
Another limitation for us is the ten minute lag on the radar images on the BoM website.
So net result, a big 'ole storm close to you circulating around hail in the upper reaches of the cloud might not show up on radar until the hail is released and gets close to the ground, and if it does appear on radar it might not be for another ten minutes after hits the ground.