The districts concerned have been asked to remain prepared to deal with any situation.
Heavy rainfall is likely to occur at isolated places, especially in Kumaon region, over next 24 hours, the MeT department said.
It has also warned of heavy to very heavy rainfall at isolated places in Garhwal region tomorrow.
C S Jeena, officer on special duty in State Emergency Operation Centre, has written to district magistrates to keep theirdisaster response mechanism fully ready to deal with any emergency in view of the alert.