The Portuguese Institute for Sea and Atmosphere (Instituto Português do Mar e da Atmosfera or IPMA) has warned that Storm Therese (Depressão Therese) will affect the mainland and Madeira through Saturday. Residents should expect intense rain, thunderstorms, and strong winds, with snow possible at high altitudes in Madeira. Sea conditions will also worsen, particularly along the southern coast and in mountainous regions. Residents should check local weather updates before traveling.