Extreme-range precipitation probability across global weather systems

Source: PubMed Central Open Access, NCBI / U.S. National Library of Medicine

Precipitating weather systems are major contributors to hazardous extreme rain, yet weather and climate models struggle to capture their dynamics and relative impacts. Using high-resolution observations, we examine precipitation probability distributions at hourly timescale linked to major system types across the globe. We show that the high-intensity tails of these distributions share a typical shape, which can be characterized by an intensity scale. Dynamic processes largely govern this universal shape, while thermodynamic factors modulate its magnitude. We find that intensity scales of major contributing systems largely match those of total precipitation due to shared thermodynamic environments, dominance of intense systems, and modest variations in dynamic scales. This universality of various system types’ precipitation probability tail supports risk assessment without overly depending on weather-type identification for most regions. We identify exceptions where intense tropical low-pressure systems or mesoscale convective system co-occurrences disproportionately affect extremes, yielding gray-swan-prone distributions. Diverse global weather systems share precipitation probability tail properties, facilitating risk assessment. teaser