The Department of Hydrology and Meteorology has warned of flash floods in Bishnumati and Dhobikhola rivers in Kathmandu Valley Wednesday evening due to heavy rainfall.
"Heavy downpour along with cumulonimbus clouds has started at the northern Shivapuri area of Kathmandu. There are chances of flash floods in Bishnumati and Dhobikhola rivers. Do remain alert along the banks after five in the evening," the department warned in a tweet.
Cumulonimbus clouds are a very dense vertical accumulation of clouds over a small area that bring heavy rainfall in the area beneath which can result in flash-floods.