Are hotspots and frequencies of heat waves changing over time? Exploring causes of heat waves in a tropical country.

It showed that a positive trend is very dominant throughout Bangladesh. 3.4 Variation of heat waves days in the most affected stations Fig 5 shows the variation of frequency of days of Tmax≥36°C for the three different decades, 1991–2000, 2001–2010, and 2011–2021, based on decadal variation.

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The frequency of days (Tmax≥36°C) is an increasing trend in the south-western part of Bangladesh.

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The frequency of days with Tmax ≥ 36°C has a decreasing trend at Mymensingh, Rajshahi and Rangpur, and the rates are -0.105, -0.214 and -0.076 day/year respectively. 3.3 Frequency of days of mild, moderate, and severe heat waves Fig 4(A) shows the variation of frequency of days of mild heat wave (MHW) for the duration of 1991–2021 in 32 stations during Pre-monsoon across Bangladesh.

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