<p>A heatwave sent the mercury soaring to 47 degrees Celsius in parts of the national capital on Saturday with no immediate relief in sight. </p>.<p>At the Safdarjung Observatory, Delhi's base station, the maximum temperature settled at 43.9 degrees as against 42.9 degrees Celsius on Friday and 42 degrees Celsius on Thursday.</p>.<p>The maximum temperature jumped to 47.1 degrees at Mungeshpur, making it the hottest place in the city. </p>.<p>Sports Complex, Pitampura, Najafgarh, Jafarpur and Ridge recorded a high of 46.9 degrees Celsius, 46.5 degrees Celsius, 46.2 degrees Celsius, 45.7 degrees Celsius and 45.5 degrees Celsius, respectively. </p>.<p>The Met office has issued a yellow alert, warning of heatwave at isolated places in Delhi on Sunday. </p>.<p>The IMD uses four colour codes for weather warnings -- green (no action needed), yellow (watch and stay updated), orange (be prepared) and red (take action).</p>.<p>The temperature may rise further as the India Meteorological Department (IMD) has forecast a mainly clear sky over the next four to five days.</p>.<p>A heatwave is declared when the maximum temperature is over 40 degrees Celsius and at least 4.5 notches above normal. A severe heatwave is declared if the departure from normal temperature is more than 6.4 notches, according to the IMD. Based on absolute recorded temperatures, a heatwave is declared when an area logs a maximum temperature of 45 degrees Celsius.</p>.<p>A severe heatwave is declared if the maximum temperature crosses the 47-degree Celsius mark.</p>
<p>A heatwave sent the mercury soaring to 47 degrees Celsius in parts of the national capital on Saturday with no immediate relief in sight. </p>.<p>At the Safdarjung Observatory, Delhi's base station, the maximum temperature settled at 43.9 degrees as against 42.9 degrees Celsius on Friday and 42 degrees Celsius on Thursday.</p>.<p>The maximum temperature jumped to 47.1 degrees at Mungeshpur, making it the hottest place in the city. </p>.<p>Sports Complex, Pitampura, Najafgarh, Jafarpur and Ridge recorded a high of 46.9 degrees Celsius, 46.5 degrees Celsius, 46.2 degrees Celsius, 45.7 degrees Celsius and 45.5 degrees Celsius, respectively. </p>.<p>The Met office has issued a yellow alert, warning of heatwave at isolated places in Delhi on Sunday. </p>.<p>The IMD uses four colour codes for weather warnings -- green (no action needed), yellow (watch and stay updated), orange (be prepared) and red (take action).</p>.<p>The temperature may rise further as the India Meteorological Department (IMD) has forecast a mainly clear sky over the next four to five days.</p>.<p>A heatwave is declared when the maximum temperature is over 40 degrees Celsius and at least 4.5 notches above normal. A severe heatwave is declared if the departure from normal temperature is more than 6.4 notches, according to the IMD. Based on absolute recorded temperatures, a heatwave is declared when an area logs a maximum temperature of 45 degrees Celsius.</p>.<p>A severe heatwave is declared if the maximum temperature crosses the 47-degree Celsius mark.</p>