What is it about?
Repeated MCSs at night can produce heavy rainfall in morning. This paper explains how MCSs responds to large-scale circulation shifting from warm to cold conditions. We examine the connection of nocturnal MCSs to wind diurnal variations and how this connection changes as the synoptic conditions change.
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Why is it important?
Our results show that large-scale circulation like subtropical high can regulate MCSs growth at night through modulating diurnal cycles. From a dynamic perspective, the subtropical high can modulate both the strength and extending direction of wind diurnal variations. From a thermodynamic perspective, it is conducive to a daytime charge of moist static energy in southern regions and a nighttime discharge downstream. Such a downscaling process may change under shifting atmospheric conditions. The results help to improve our understanding of multiscale processes in heavy rain events.
Perspectives
It has been well recognized that the subtropical high can influence rainfall on seasonal and daily time scales. At shorter time scale (diurnal cycle), we may see the multi-scale processes inspired by subtropical high that control the location and timing of heavy rains. I hope you find this article thought-provoking.
Guixing Chen
Sun Yat-Sen University
Read the Original
This page is a summary of: Diurnal Variations of Low-Level Winds and Precipitation Response to Large-Scale Circulations during a Heavy Rainfall Event, Monthly Weather Review, November 2019, American Meteorological Society,
DOI: 10.1175/mwr-d-19-0131.1.
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