Find out what to do in case of extreme weather according to Civil Defense. Starting this Friday (17), Rio Grande do Sul faces a sequence of days with instability. The severe weather episode will include strong winds and heavy rain until early next week. The forecast indicates wind gusts of up to 90 km/h, hail and rainfall that can exceed 100 millimeters in a few hours, increasing the risk of flooding. On Thursday (16), instability already caused hail to fall in Santa Vitória do Palmar, in the south of the state, and a tree to fall on a house in Uruguaiana, on the West Border. ? Access the g1 RS channel on WhatsApp This Friday, the highlight is the intensification of the north wind, driven by a low-level jet that transports heat and humidity to the state. Areas of the Western Border, Campaign, Central Region, Missions and part of the West should record gusts between 70 km/h and 90 km/h. There is a risk of falling branches and trees, roofing and occasional interruptions in the power supply. In the Metropolitan Region and in the Valleys, the wind also blows strong, but with less intensity. Biggest gusts of wind until 6am this Friday (17): Faxinal do Soturno: 69.5 km/h Dona Francisca: 63 km/h Santa Maria: 58 km/h Herval: 55.1 km/h Dom Pedrito: 52.6 km/h Aceguá: 49.7 km/h Bagé: 49.3 km/h Quaraí: 49 km/h Palmeira das Missões: 48 km/h Pinheiro Machado: 46.8 km/h Uruguaiana: 46.8 km/h This Friday's rain will be isolated, occurring mainly between the afternoon and evening. In Porto Alegre, the weather is muggy, with sun between many clouds and strong wind, but with little chance of rain. Saturday (18) will be a day with high meteorological risk due to the advance of a cold front. The instability begins at dawn along the Western Border and Campaign, advancing towards the center of the state throughout the day. Storms can bring intense rain, medium to large hail, frequent electrical discharges and strong winds. The highest rainfall accumulations are predicted for the Campaign, Western Border and Central Region, reaching more than 100 millimeters. In the North, Northeast, Serra, Vales and Metropolitan Region, including Porto Alegre, rain showers are forecast between the afternoon and evening. On Sunday (19), the cold front remains practically stationary over the state, causing persistent rain. Western Border, Campaign, Central Region, Missions and part of the Valleys concentrate the largest volumes. Throughout the day, instability advances to the northern half, leaving the weather closed and rainy in the Serra, the Planalto and the Metropolitan Region. Monday (20) continues with frequent rain in practically all regions. The intensity of the storms gradually decreases, but the waterlogged ground maintains the danger of disturbances. Winds lose strength in most of the state, and temperatures become mild. READ ALSO: Wind knocks down tree on house in Uruguaiana Hail hits the city of Santa Vitória do Palmar What to do in case of hail, gales, floods and landslides City that recorded 2ºC a week ago has heat of 34ºC RS has Civil Defense warning for severe storms and risk of tornado Instability has already caused hail and tree falls in RS Reproduction/RBS TV VIDEOS: Everything about RS