Our Company SOPs...remain 3NM clear of any CB on final approach.
Have graded avoid distances at medium and high levels (20NMs from a return at 30,000' plus). This is talking about DOWNWIND distances though. A TS notionally moves in the direction of the 10,000' wind and upwind clearance (from a turb and hail clearance point of view) is much less.
As someone said as you get closer you will see more red (the gains are artificially increased from NASA et als datum gains). Long story related to product liability claims and does not indicate a rapid increase in activity in the last minute.