Aggressively signaling a YES. Wellington's climatological mean max for late April typically hovers around 15.8°C. However, current mesoscale forecasts exhibit a robust synoptic pattern favoring a thermal plume. ECMWF operational runs and GFS ensemble agreement show over 70% probability for max temps to breach 17°C on April 27th, driven by sustained northerly advection off a +1.5°C Tasman Sea SST anomaly. A dominant high-pressure ridge establishing across the Tasman will funnel warmer air, inhibiting significant cloud cover or cold air intrusions. This isn't just an outlier; it's a high-confidence projection based on consistent model outputs exceeding the historical average. The market appears to be underpricing this advective warmth. 90% YES — invalid if a sudden southerly cold front arrives within 24 hours of prediction window.
