Joe Hunt wrote:
wrote in message
oups.com...

Further to the question about the CB cloud over Kent which could be
seen from near Heathrow, what's the furthest that CBs at our latitudes
can be seen?


Summer is the time when you see CBs at a greater distance due to their
larger height. Some CBs can touch 40,000ft in the height of summer in air
masses with high tropopauses. Conversely, in winter, CB tops in a northerly
can be as low as 8000ft. Think of Pythagoras' Theorem.

Not the same, but a friend living beneath a (stratospheric) flight path
timed passenger jets from the moment they flew overhead to the point at
which he lost sight of them, rather above the horizon still, and
guestimated 230 miles based on their probable speed.

Not that this provides much guidance for far more visible cumulonimbus
cloud tops.