The IMD has forecast heavy rainfall and thunderstorms across Kerala until November 12, issuing yellow alerts for multiple districts. These wet weather conditions are driven by an upper-air. THIRUVANANTHAPURAM: The India Meteorological Department (IMD) has forecast heavy rainfall in Kerala today and tomorrow. The India Meteorological Department has issued a yellow alert for heavy rains in Thiruvananthapuram, Kollam, Pathanamthitta, and Alappuzha due to cyclonic circulation influences.