The PDMA said the ongoing heatwave is likely to persist for the next few days, while thundershowers are expected in upper regions from the evening and night of June 4.

Officials warned that the combination of rapid glacier melt and rainfall could increase river flow and raise the risk of flash floods and glacial lake outburst events.

The alert covers sensitive mountainous districts including Swat, Chitral, Kohistan, Dir and Mansehra, where risks of landslides, mudslides, rockfalls and disruption of communication routes have also been identified.

Lower Chitral, Lower Dir, Swat, Upper Kohistan and Mansehra have been placed on alert.

The PDMA said a sudden overflow of rivers and streams could trigger flooding in low-lying areas.

It has directed local administrations to closely monitor vulnerable locations and maintain readiness for any emergency situation.