Roger Brugge wrote:

Norman Lynagh wrote:
In message , Rodney Blackall
writes
Does anyone here know why, when an area of rain is projected to move
across
the country on BBC TV presentations, it does so rather like a worm? (The
leading edge moves on leaving the trailing edge in place, then the
trailing
edge catches up while the leading edge is stopped.)

I would have expected it to be more difficult to program this effect
than the more realistic whole-body translation.


Morphing between 3-hourly time-steps?


Yes, that's right Norman. I asked a BBC forecaster why fronts kept
splitting as they crossed the UK and that was the answer. A case of the
using the wrong interpolation algorithm.

Why don't they use the hourly data from the model?

--
Graham Davis
Bracknell