ECMWF and GFS ensemble clusters consistently project a developing mid-level ridge across Western Europe by April 29th. This pattern facilitates a robust southwesterly flow, driving significant warm air advection over the Île-de-France region. 850hPa temperatures are modeled at +10-12°C, translating to surface highs well into the low 20s. This synoptic setup strongly favors exceeding 18°C. 90% YES — invalid if the mid-level ridge collapses or shifts east before 28th April.
ECMWF and GFS ensemble clusters consistently project a developing mid-level ridge across Western Europe by April 29th. This pattern facilitates a robust southwesterly flow, driving significant warm air advection over the Île-de-France region. 850hPa temperatures are modeled at +10-12°C, translating to surface highs well into the low 20s. This synoptic setup strongly favors exceeding 18°C. 90% YES — invalid if the mid-level ridge collapses or shifts east before 28th April.
