Investigating a Derecho in a Future Warmer Climate

Derechos are extensive swaths of damaging winds produced by some long-lived, widespread mesoscale convective systems. Little research has been conducted concerning how derecho mechanisms might change in a future, warmer climate. In this study, the pseudo–global warming method is utilized to evaluate...

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Vydané v:Bulletin of the American Meteorological Society Ročník 104; číslo 10; s. E1831 - E1852
Hlavní autori: Lasher-Trapp, Sonia, Orendorf, Sophie A., Trapp, Robert J.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Boston American Meteorological Society 01.10.2023
Predmet:
Climate change
Climate change scenarios
Climate models
Cold
Derechos
Evaporative cooling
Global warming
Inflow
Mesoscale convective systems
Precipitation
Relative humidity
Simulation
Storms
Swaths
Thunderstorms
Vortices
Wind
Winds
United States > US
ISSN:0003-0007, 1520-0477
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Shrnutí:Derechos are extensive swaths of damaging winds produced by some long-lived, widespread mesoscale convective systems. Little research has been conducted concerning how derecho mechanisms might change in a future, warmer climate. In this study, the pseudo–global warming method is utilized to evaluate how the 10 August 2020 midwestern U.S. derecho, the costliest thunderstorm event in U.S. history to date, might differ if it instead occurred in a warmer climate at the end of this century. The 10 August derecho event is first simulated in its observed environment, and then resimulated in environments altered according to projections from different climate models using a high-emissions climate change scenario. Results suggest that near the end of this century, a similar derecho event may not necessarily have more intense winds but could possibly impact a geographical area 50% to 100% larger. The physical chain of events leading to this greater geographical impact result from the derecho winds beginning earlier in the storm lifetime, due to increased precipitation combined with decreased relative humidity right above the ground, and derecho winds extending northward due to a strengthening of the parent storm from increased instability there. All these factors enhance the area of evaporative cooling and thus the cold pool, which in turn extends the area covered by the rear-inflow jet within the storm, the likely main mechanism for most of the damaging winds at the ground in the historical event. More study of other cases is required to evaluate the generality of this result.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0003-0007
1520-0477
DOI:10.1175/BAMS-D-22-0173.1