In this issue of Weather

We start the September 2016 Weather with an examination of the separation of rainfall events in relation to their significance and number in ‘Relationship between minimum inter‐event time and the number of rainfall events in Peninsular Malaysia’ on p. 213. Authors R. J. Chin, S. H. Lai, K. B. Chang, W. Z. W. Jaafar and F. Othman clearly demonstrate the differences in these variables with position, climatology and the choice of minimum inter‐event time (MIT). Importantly, they clearly indicate the need for care in researchers’ choice of MIT, according to sensitivity and weather regime or system. Next, we move on to a timely re‐examination of tropical revolving storms. Roger Smith and Michael Montgomery outline the results of recent research into these mesoscale weather systems in ‘Understanding hurricanes’ on p. 219. Many factors affect the concentration of greenhouse gases in the Earth's atmosphere, including its uptake by plants, which varies by season. Significantly, James and Samuel Curran show that a long‐term trend is evident in this variation in ‘An estimate of the climate change significance of the decline in the Northern Hemisphere's uptake of carbon dioxide in biomass’ on p. 226, demonstrated by readings taken at Mauna Loa observatory. The regular feature on Scottish snow patches by Iain Cameron, Adam Watson and John Pottie appears on p. 228. The survival of seventy‐four patches of snow is high, reflecting the climatology of 2015 (rather than any lack of warmth) and forms the latest part of one of the most fascinating climatological studies published in the journal. Finally, Bill Pike examines a thunder event using continuity of upper‐air and surface analyses in ‘A travelling cold pool causes thundery re‐invigoration of a dormant frontal system during the early hours of 28 July 2014’ on p. 231. The value of on‐line resources in clear from his paper and he shows that the amateur can readily carry out analyses of such events.