Robust upper-level ridging and a sustained southwesterly flow are projected to dominate East China's synoptic pattern, driving significant warm air advection into Shanghai. Both GFS and ECMWF operational runs show boundary layer temperatures consistently peaking at 28-29°C. This powerful thermal plume indicates a clear exceedance of the 27°C threshold. 90% YES — invalid if a cold frontal passage stalls unexpectedly.
Robust upper-level ridging and a sustained southwesterly flow are projected to dominate East China's synoptic pattern, driving significant warm air advection into Shanghai. Both GFS and ECMWF operational runs show boundary layer temperatures consistently peaking at 28-29°C. This powerful thermal plume indicates a clear exceedance of the 27°C threshold. 90% YES — invalid if a cold frontal passage stalls unexpectedly.
