New Delhi Apr 20 PTI A heatwave scorched parts of Delhi on Wednesday while cloudy weather and gusty winds are predicted to bring the mercury down by a few notches on Thursday The maximum temperature at the Safdarjung Observatory -- the capitals base station -- settled at 412 degrees Celsius as against426 degrees Celsius on Tuesday Sports Complex was the warmest place in the capital with a high of 443 degrees Celsius The weather stations at Ridge Mungeshpur Najafgarh and Pitampura recorded their maximum temperature above the 43-degree mark On Tuesday 8 out of the 12 weather stations in Delhi had witnessed a heatwave to severe heat conditions recording a maximum temperature of more than 43 degrees Celsius making it the warmest day of the season The MeT Office has predicted a drizzle and thunderstorm over the capital on Thursday with winds gusting up to 40 kilometers per hour The heatwave conditions may abate but the maximum temperature will remain above normal The mercury will rise again to 42 degrees Celsius by next week an official said The capital has recorded eight heatwavedays in April this year the maximum since 11 such days witnessed in the month in 2010 For the plains a heatwave is declared when the maximum temperature is over 40 degrees Celsius and at least 45 notches above normal A severe heatwave is declared if the departure from normal temperature is more than 64 notches according to the IMD The capital had recorded a maximum temperature of 432 degrees Celsius on April 21 2017 The all-time high maximum temperature for the month was 456 degrees Celsius on April 29 1941 The weather department had earlier said northwest India and adjoining parts of central India are likely to see more intense and frequent heatwave conditions in April PTI GVS CK