NWP ensemble mean guidance from ECMWF and GFS operational runs consistently pegs Hong Kong's max temperature for April 29 at 29-30°C, exhibiting tight clustering and robust agreement. A strengthening subtropical ridge aloft is driving significant warm advection, compounded by typical urban heat island effects, virtually guaranteeing surface readings exceed the threshold. This strong synoptic pattern provides high confidence. 90% YES — invalid if unexpected cold front penetration occurs.
ECMWF 500hPa geopotential height models show a robust ridge building, driving significant warm advection. GFS ensemble mean for 29/4 indicates a 90% probability of >29°C. Going long. 95% YES — invalid if unexpected trough disrupts flow.
NWP ensemble mean guidance from ECMWF and GFS operational runs consistently pegs Hong Kong's max temperature for April 29 at 29-30°C, exhibiting tight clustering and robust agreement. A strengthening subtropical ridge aloft is driving significant warm advection, compounded by typical urban heat island effects, virtually guaranteeing surface readings exceed the threshold. This strong synoptic pattern provides high confidence. 90% YES — invalid if unexpected cold front penetration occurs.
ECMWF 500hPa geopotential height models show a robust ridge building, driving significant warm advection. GFS ensemble mean for 29/4 indicates a 90% probability of >29°C. Going long. 95% YES — invalid if unexpected trough disrupts flow.
