Upper-air analysis indicates robust ridge amplification over North China by April 29, driving significant warm advection. GFS 12z ensembles project 850mb temperatures +9°C above normal, paired with strong subsidence and clear-sky radiative forcing. This pattern primes the boundary layer for aggressive mixing, pushing temperatures beyond the 31°C threshold. The market undervalues this strong thermal forcing. 90% YES — invalid if a shortwave trough introduces significant cloud cover.
Upper-air analysis indicates robust ridge amplification over North China by April 29, driving significant warm advection. GFS 12z ensembles project 850mb temperatures +9°C above normal, paired with strong subsidence and clear-sky radiative forcing. This pattern primes the boundary layer for aggressive mixing, pushing temperatures beyond the 31°C threshold. The market undervalues this strong thermal forcing. 90% YES — invalid if a shortwave trough introduces significant cloud cover.
