The ULL NW of #Delta seems to have outrun Delta itself, meaning the downstream upper ridging was displaced from the TC. This is allowing part of it to be affected by some ENE shear, which has disrupted it & slowed its intensification. Still, very dangerous storm with 130mph wind pic.twitter.com/VKMomigz0M

— Alex Boreham (@cyclonicwx) October 6, 2020