The Met Department issued a yellow alert and forecast heavy rains for three coastal districts and 12 more in the south interior Karnataka, an official said on Tuesday. "Thunderstorm with lightning is likely to occur at isolated places over south interior Karnataka from Tuesday to Wednesday," said a Met official. Coastal Karnataka — Dakshina Kannada, Udupi and Uttara Kannada districts have been issued a yellow alert for the next two days with thundershowers and gusty winds. Winds blowing at speed of 40-50 km per hour are expected on the coast and the Met department warned fishermen against venturing into the sea. Meanwhile, heavy showers on Sunday night in Vijayapura district gave rise to flash floods in the Doni river and Sogali stream. An overflowing Doni river submerged Talikote - Hadaginal bridge, an old one from the British times, and also some agricultural lands. Only recently, the agricultural lands were sown with tur. (IANS)