Mumbai: After two consecutive days of unseasonal rainfall, May 7 was recorded as the second wettest May Day in a decade with IMD Colaba and Santacruz observatories recording 12.4mm and 24.8mm rainfall, respectively, in the 12 hours ending 8.30pm Wednesday. For IMD Santacruz, it was the second highest, 24-hour May rainfall in a decade. Previously, on May 18, 2021, it had logged a massive 230mm rainfall in a single day due to cyclonic storm ‘Tauktae’. A late-night downpour with lightning and thunder on Tuesday was followed by another spell on Wednesday morning and again in the early evening hours. The BMC received 15 tree fall complaints from city area in the 24-hour period. For Mumbai, a yellow alert was issued for both May 7 and 8, indicating thunderstorms with lightning, light to moderate rainfall, and gusty winds.Weather experts attributed this unusual system to a rare, strong low-latitude Western Disturbance currently stationed over north Gujarat, along with a mid-level trough extending to the north Arabian Sea. “It is very rare for a Western Disturbance to dip this far south in May,,” said independent meteorologist Athreya Shetty. Weather enthusiast Rushikesh Agre said cooler days for Mumbai and surrounding areas will continue until around May 9-10. Meanwhile, Abhijit Modak, who runs the Konkan Weather blog, said this unique May weather setup is leading to an unusual and welcome change in weather conditions during what is typically the peak of summer.