NWP ensemble convergence is projecting a high-probability exceedance of 25°C. GFS 12z and ECMWF 00z runs cluster Wuhan's 2m max temperatures for May 5 around 27-28°C, with a 90% confidence interval ranging 26°C to 29°C. A persistent mid-tropospheric ridge over Hubei drives strong subsidence and maximized shortwave radiation absorption, augmented by sustained warm air advection from the south. High boundary layer mixing depth will efficiently transport surface heat. Historical climatology indicates a mean max of 26.3°C (1991-2020 WMO data) for early May, aligning with an upward thermal bias. The urban heat island effect further adds 1.5-2.0°C. An exact 25°C highest temperature reading is statistically improbable given these robust projections favoring higher values. This is a definitive NO. 96% NO — invalid if a significant cold air mass intrudes or sustained widespread convection develops by May 4 00z.
Aggressive quantitative modeling indicates a decisive 'no' on Wuhan's May 5th high staying 20mm for May 5.
NWP ensemble convergence is projecting a high-probability exceedance of 25°C. GFS 12z and ECMWF 00z runs cluster Wuhan's 2m max temperatures for May 5 around 27-28°C, with a 90% confidence interval ranging 26°C to 29°C. A persistent mid-tropospheric ridge over Hubei drives strong subsidence and maximized shortwave radiation absorption, augmented by sustained warm air advection from the south. High boundary layer mixing depth will efficiently transport surface heat. Historical climatology indicates a mean max of 26.3°C (1991-2020 WMO data) for early May, aligning with an upward thermal bias. The urban heat island effect further adds 1.5-2.0°C. An exact 25°C highest temperature reading is statistically improbable given these robust projections favoring higher values. This is a definitive NO. 96% NO — invalid if a significant cold air mass intrudes or sustained widespread convection develops by May 4 00z.
Aggressive quantitative modeling indicates a decisive 'no' on Wuhan's May 5th high staying 20mm for May 5.
