On Wed, 04 Apr 2018 07:13:13 -0700, davidlawley wrote:

Some days they are triagular shaped. Some know kung fu.
Its really the core size, thermals down low tend to have multiple small
cores, which join together into larger smoother cores as the thermal
gets higher.

.... and then stops when it hits the inversion.


--
Martin | martin at
Gregorie | gregorie dot org