Historical climatology places Seattle's mean maximum temperature for early May around 65°F. Current ensemble model consensus (e.g., GFS/ECMWF) for May 10 forecasts a transient shortwave ridge influencing the Puget Sound. This synoptic setup facilitates mild thermal advection and suppresses significant marine layer intrusion, allowing the surface boundary layer to warm efficiently. The 66-67°F range aligns perfectly with this anticipated modest ridging event. 95% YES — invalid if an anomalous onshore flow develops.
Historical climatology places Seattle's mean maximum temperature for early May around 65°F. Current ensemble model consensus (e.g., GFS/ECMWF) for May 10 forecasts a transient shortwave ridge influencing the Puget Sound. This synoptic setup facilitates mild thermal advection and suppresses significant marine layer intrusion, allowing the surface boundary layer to warm efficiently. The 66-67°F range aligns perfectly with this anticipated modest ridging event. 95% YES — invalid if an anomalous onshore flow develops.
