ECMWF ensemble mean for Paris on April 27 indicates a 75% probability cone exceeding 22°C, with the 850 hPa anomaly projecting significant warm advection from the southwest. GFS runs consistently align, clustering around 23-24°C due to persistent high-pressure ridging. This robust synoptic pattern practically guarantees a breach of the 21°C threshold. Expect strong insolation and minimal cloud cover driving surface temperatures higher. 90% YES — invalid if major trough development by April 25.
ECMWF ensemble mean for Paris on April 27 indicates a 75% probability cone exceeding 22°C, with the 850 hPa anomaly projecting significant warm advection from the southwest. GFS runs consistently align, clustering around 23-24°C due to persistent high-pressure ridging. This robust synoptic pattern practically guarantees a breach of the 21°C threshold. Expect strong insolation and minimal cloud cover driving surface temperatures higher. 90% YES — invalid if major trough development by April 25.
