Trader consensus has locked in 29°C or higher as virtually certain for Buenos Aires' highest temperature on March 18, driven by official forecasts from Argentina's Servicio Meteorológico Nacional and international models like GFS and ECMWF, which converge on peaks of 32–35°C amid a persistent subtropical high-pressure ridge fueling a regional heatwave. Recent observations confirm this pattern, with preceding days exceeding 30°C under clear skies and low humidity, aligning with historical March extremes during similar blocking highs. Scenarios challenging this include an unforeseen southerly gale introducing cooler maritime air or unmodeled convective showers increasing cloud cover, though ensemble probabilities assign these under 5% likelihood based on current upper-air analyses.