On Thursday, 10 November 2016 17:27:32 UTC+2, Matt Herron Jr. wrote:

Hmm,

I think it's the vertical component that distorts the shape, not the horizontal wind. We agree that a parcel of air in the core is rising faster than air on the edge of the thermal. Therefor it's slope is more vertical. It take less time to climb 1000 feet than the parcel next to it. That shorter time means it is blown downwind less than slower vertical parcels and therefor the core tends to pile up on the upwind side of the thermal.

Matt

I was talking about horizontal wind field. What you say makes no sense.