Northern Andhra Pradesh and its southern coastal regions would experience a heat wave for three days from Monday to Wednesday, the Meteorological department said in a statement on Monday. Warnings are out especially for the districts of Srikakulam, Vizianagaram, Visakhapatnam, Anakapalle, Kakinada, Konaseema, Krishna, NTR, Bapatla, Gunturu and Palnadu.