High-res GFS and ECMWF 00z runs show robust low-level stratus advection across the LA coastal plain through April 28, driven by a persistent eastern Pacific trough. Boundary layer analysis indicates a strong marine inversion cap will inhibit vertical mixing and onshore warming. Forecasted 850mb temperatures and surface dew point convergence strongly align with suppressed diurnal heating, locking in the 66-67°F range. 95% YES — invalid if sustained Santa Ana develops.
High-res GFS and ECMWF 00z runs show robust low-level stratus advection across the LA coastal plain through April 28, driven by a persistent eastern Pacific trough. Boundary layer analysis indicates a strong marine inversion cap will inhibit vertical mixing and onshore warming. Forecasted 850mb temperatures and surface dew point convergence strongly align with suppressed diurnal heating, locking in the 66-67°F range. 95% YES — invalid if sustained Santa Ana develops.
