The rain gained strength after the formation of low pressure over the Bay of Bengal on Sunday morning.
Karnataka State Natural Disaster Monitoring Centre (KSNDMC) has predicted scattered to moderate rains over coastal, manland and north interior regions.
The weather bureau said that the sea condition will be very rough and advised fishermen not to venture into the sea till June 4.
Severe heat conditions prevailed at isolated places in coastal and Rayalaseema districts on Sunday.
The new protocol will mandate coastal States to initiate emergency response measures before a weather system is declared as ‘’cyclonic storm”.