Spatial and temporal variations of thunderstorm activities over Sri Lanka

Sonnadara, D. U. J.

doi:10.1007/s00704-015-1442-x

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…The database includes all types of thunderstorms, namely convective, orographic, and seasonal. The changes in observation methods and relocation of stations affect the trends (Sonnadara, 2015). However, no changes in observation methods and relocation of these 294 stations have been observed during these periods.…”

Section: Methodsmentioning

confidence: 99%

Spatial and temporal analysis of thunderstorm and rainfall activity over India

Bhardwaj

Singh

2018

Atm

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RESUMENLas tormentas eléctricas son uno de los fenómenos meteorológicos severos de mesoescala más devastadores, y desempeñan un papel relevante en la incidencia de precipitación en una región. Por ello, en el presente estudio se trató de identificar la relación entre días de tormenta (Thn), días de lluvia (Thr) y cantidad de la precipitación (Trr) en 294 estaciones meteorológicas distribuidas a lo largo de la India por medio de datos (normales climatológicas) publicados por el Departamento Meteorológico de la India (IMD, por sus siglas en inglés) para cuatro periodos: 1951-1980, 1961-1990, 1971-2000 y 1981-2010. El análisis mostró la existencia de una reducción drástica en la frecuencia de Thn, mientras que Thr y Trr mostraron un descenso leve. Se observó una correlación significativa entre las tres variables. El análisis mensual mostró un pico doble en la ocurrencia de Thn y un pico sencillo en la precipitación; sin embargo, se advirtió un intervalo de un mes entre la presentación de estos picos. Estos resultados demuestran que el monzón de verano de la India afecta de manera significativa la actividad de las tormentas eléctricas. El análisis estacional sugiere que Thn, Thr y Trr alcanzaron sus máximos durante la estación del monzón y sus mínimos durante el invierno. Por otra parte, se ha demostrado la existencia de una relación negativa entre Thn y Thr, y Thn y Trr durante el monzón, anomalía que puede deberse a la temperatura decreciente en la India durante dicha estación. Adicionalmente, el patrón espacial mensual y estacional de la ocurrencia de Thn, Thr y Trr permanece casi inalterado en el periodo . No obstante, se observó una disminución drástica en la frecuencia de Thn en los periodos subsiguientes en todo el país. De manera similar, se percibió una leve disminución en la frecuencia de Thr y Trr sobre la India, excepto en el noreste, que exhibe una tendencia al alza en la precipitación. Se ha encontrado que el índice Thn/Thr (R) alcanza su máximo en la temporada previa al monzón, mientras que el índice Trr/Thn alcanza su máximo durante la temporada del monzón. El análisis regional de Thn, Thr y Trr muestra una amplia gama de variaciones en la ocurrencia de estos patrones a lo largo del año. Se considera que los resultados de este estudio serán de utilidad para los meteorólogos, pilotos aviadores, agricultores y planificadores. ABSTRACTThunderstorms are one of the most devastating mesoscale severe weather phenomena, which play an important role in the occurrence of rainfall activity over a region. Therefore, in the present study an attempt has been made to identify the relationship between thunderstorm days (Thn), rainy days (Thr) and rainfall amounts (Trr) for 294 meteorological stations spreading over India, by means of published data (climatological normals) from the India Meteorological Department (IMD) for four periods, 1951-1980, 1961-1990, 1971-2000, and 1981-2010. The analysis has revealed a sharp decrease in the frequency of Thn, while Thr and Trr showed a slight decline. A significant correlat...

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Section: Methodsmentioning

confidence: 99%

Spatial and temporal analysis of thunderstorm and rainfall activity over India

Bhardwaj

Singh

2018

Atm

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“…During the same period of time, the inland plains ground stations showed a decrease in thunder day frequency during the summer. In Southern Asia, the Island of Sri Lanka has shown a predominantly increasing long-term trend in thunder days annually (Sonnadara, 2016). This study, which made use of nine ground-based stations across the country during the years of 1961-2010, showed that five stations had a significant increase in annual thunder days, while four showed no significant trends.…”

Section: Introductionmentioning

confidence: 78%

“…Various localized studies have been conducted on the frequency of thunder days, and other severe weather phenomena, using ground station data on the annual and seasonal time scales. In Southern Asia, the Island of Sri Lanka has shown a predominantly increasing long-term trend in thunder days annually (Sonnadara, 2016). In Asia, Lin-Lin et al (2010) and Zhang et al (2017) presented that the occurrence of weather events such as thunderstorms and hail have been decreasing in China in the past 50 years.…”

Section: Introductionmentioning

confidence: 99%

How Does the Trend in Thunder Days Relate to the Variation of Lightning Flash Density?

Lavigne

Liu

2019

JGR Atmospheres

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A longstanding question for scientists has been whether or not any observable trends or shifts in global lightning activity have occurred since the Industrial Revolution. This study utilized over 8,000 certified ground‐based stations over a 43‐year period, as well as 16 years of Tropical Rainfall Measuring Mission (TRMM) Lightning Imaging Sensor (LIS) data, to provide a better understanding of the processes behind these trends. Ground station results show that many global regions have observed significant increases or decreases in thunder day occurrence. The Amazon, Maritime Continent, India, Congo, Central America, and Argentina display increases in annual thunder days since the 1970s, whereas China, Australia, and the Sahel among others observe decreases in the number of thunder days. The corresponding change in lightning flash density from the TRMM‐LIS, as well as the number of thunderstorm features and lightning flashes per thunderstorm feature, is compared to the thunder day trends during the TRMM lifespan. Results show a positive correlation between the changes of thunder day occurrence and flash density over most regions of the TRMM domain, including the Maritime Continent, China, South Africa, and Argentina. However, there are several regions with disagreements between the flash density and thunder day trends, such as India and Western Africa. The disagreements are related to the changes in the number of flashes per thunderstorm, which suggest other reasons to interpret the long term trends in thunder day occurrence over various regions. Understanding these regional trends in lightning activity is important in understanding the changes of precipitation systems under a varying climate.

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“…In some countries, a ground lightning detection network has been installed (Qie et al 2003), but there is no such network in Iran. (Sonnadara 2016) investigated the temporal and spatial changes of days with lightning in Sri Lanka and concluded that there is no signi cant increase or decrease in the frequency of lightning events in Sri Lanka. Also, thunderstorms events in humid areas (Southwest) are more than in dry areas.…”

Section: Introductionmentioning

confidence: 99%

Spatial-statistical analysis of lightning events in Iran

mahmoudabadi,

Sadeghi

2023

Preprint

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The purpose of this study is to investigate the phenomenon of lightning in Iran in an eleven-year statistical period (2006–2016). For this purpose, precipitation data which included days with lightning (codes 92, 94, 95, 96, 97, 98), were extracted from other atmospheric phenomena and their spatial and temporal distribution was investigated on a monthly and yearly scale. Then, Iran was divided into 5 regions including: North and Northwest, West and Southwest, Centre, East and Northeast, South and Southeast. The obtained results showed that the highest rate of lightning activity is in stations in the north and northwest. In this region, the highest number of lightning events occur in the months of April to July and the least are in January to March. In the western and southwestern and eastern and southeastern regions, the frequency of lightning is higher in the months of March to June. But the lowest incidence is in the west and southwest region in June to September and in the east and northeast in July to December. In the central region, the spring season has the highest and September and December have the lowest occurrence of lightning. In the south and southeast region, autumn and spring have the most and June to September have the least occurrence of lightning. In general, the frequency of lightning events in the north and northwest stations is higher than in other regions of Iran. The lowest incidence of lightning phenomenon is also seen in the central parts and southeast of Iran.

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Spatial and temporal variations of thunderstorm activities over Sri Lanka

Cited by 6 publications

References 13 publications

Spatial and temporal analysis of thunderstorm and rainfall activity over India

Spatial and temporal analysis of thunderstorm and rainfall activity over India

How Does the Trend in Thunder Days Relate to the Variation of Lightning Flash Density?

Spatial-statistical analysis of lightning events in Iran

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