A downpour is a localized but intense rainfall activity. Short periods of very heavy rainfall over a small geographical area can cause widespread destruction, especially in hilly regions where this phenomenon is most common.
However, not all cases of very heavy precipitation are showers. A shower has a very precise definition: rain of 10 cm or more in one hour over an area of approximately 10 km x 10 km is classified as a shower. Under this definition, 5 cm of rain over a half-hour period over the same area would also be classified as a downpour.
In recent cloud bursts and flash floods reported in Himachal Pradesh and Uttarakhand, more than 20 people were killed in the destruction. Isolated areas of these two states reported heavy rains during this period, causing landslides and flash floods that disrupted rail and road traffic, and led to the collapse of houses and walls.
Delhi experienced a partly cloudy morning on Tuesday even as the weather bureau forecast light rain in the city during the day. According to the IMD, the city’s minimum temperature was recorded at 27.2 degrees Celsius, a notch above normal.
In Gujarat, several villages in Vadodara, Anand, Narmada and Bharuch districts have been put on flood alert as several dams in central Gujarat, including the Sardar Sarovar dam in Narmada, have started to release water, to following heavy rains.
The Sardar Sarovar dam recorded a water level of 135.68 meters – three meters below its full reservoir level – on Tuesday evening even as Sardar Sarovar Narmada Nigam Ltd. (SSNNL) released 5 lakh cusecs of water from 23 gates of the dam.
In Kerala, tIndia’s meteorological service has issued an ‘orange’ alert in Idukki, Thrissur, Malappuram and Kasargod districts indicating the possibility of isolated heavy to very heavy rains. A yellow alert has been issued for all other districts except Thiruvananthapuram and Kollam.