The southwest monsoon, which had weakened over Jharkhand, is expected to be revived after 48 hours, weathermen said on Monday with the state's northern, central and southern regions expected to experience heavy rainfall between Wednesday and Friday.

"Monsoon which had become weak over Jharkhand due to the shifting of the trough towards the north is expected to revive around mid-week. Most districts would get a good spell of rain after 48 hours. We have also issued an alert of heavy rain in isolated areas from Wednesday, " said Abhishek Anand, head of Ranchi Meteorological Centre.

Weathermen said a monsoon trough at mean sea level was running from northwest Uttar Pradesh to Tripura across east Uttar Pradesh,

Bihar, Sub-Himalayan West Bengal and Assam. Another north-south trough from northeast Bihar to south coastal Odisha across northeast Jharkhand and Gangetic West Bengal, at 1.5 km above mean sea level, would assist in rainfall activity.

The southwest monsoon had weakened over Jharkhand for over a week.

The Met department also issued a lightning alert for northern and south-eastern parts of Jharkhand during the next two days.

Lightning was reports from several parts of the state on Monday afternoon, including Ramgarh, Hazaribagh, northern Ranchi, Chatra and Latehar.

Light to moderate rain was also reported at a few places in the last 24 hours.

Due to a weakened monsoon, several districts have been experiencing sultry weather, which in turned pushed up the discomfort index.

The average discomfort index, measured on the basis of temperature, humidity and wind patterns, was 60 degrees, five notches above normal, in Jharkhand on Monday.

A climate analyst at IMD’s Ranchi office said the weather would be slightly warm and humid for the next two days.

Statistics of monsoon rain revealed that so far Jharkhand has received 300.1mm against a normal of 246mm, a surplus of 22 per cent.