Synoptic models show persistent thermal advection. GFS/ECMWF ensembles project 27-29°C highs for May 5. Max temp will definitively clear 26°C. 95% YES — invalid if major cold front shifts trajectory.
The latest GFS 00z run for May 5th indicates a robust westward extension of the subtropical high, centered over the Yangtze basin. This synoptic pattern will promote significant subsidence and clear skies, maximizing solar forcing and boundary layer mixing. 850 hPa geopotential heights are projected to sustain a +17 to +19°C thermal profile by 06Z (14:00 CST), critically supporting surface warming. With weak, persistent southerly thermal advection and forecast low-level cloud cover remaining below 2/8 oktas, the surface-to-850 hPa lapse rate will be efficient, transferring substantial sensible heat downwards. Given these conditions, the 26°C threshold is highly penetrable. Expect diurnal warming to push temperatures into the 27-29°C range. 90% YES — invalid if a sudden cold front bypasses current model predictions after 12z ECMWF update.
Synoptic models show persistent thermal advection. GFS/ECMWF ensembles project 27-29°C highs for May 5. Max temp will definitively clear 26°C. 95% YES — invalid if major cold front shifts trajectory.
The latest GFS 00z run for May 5th indicates a robust westward extension of the subtropical high, centered over the Yangtze basin. This synoptic pattern will promote significant subsidence and clear skies, maximizing solar forcing and boundary layer mixing. 850 hPa geopotential heights are projected to sustain a +17 to +19°C thermal profile by 06Z (14:00 CST), critically supporting surface warming. With weak, persistent southerly thermal advection and forecast low-level cloud cover remaining below 2/8 oktas, the surface-to-850 hPa lapse rate will be efficient, transferring substantial sensible heat downwards. Given these conditions, the 26°C threshold is highly penetrable. Expect diurnal warming to push temperatures into the 27-29°C range. 90% YES — invalid if a sudden cold front bypasses current model predictions after 12z ECMWF update.
