The National Weather Service offices in Chicago, Milwaukee, Sacramento, Boulder, and the Twin Cities have issued forecasts indicating ongoing and upcoming thunderstorms across multiple regions in the United States. In northern Illinois and northwest Indiana, scattered to numerous thunderstorms are expected through Saturday, with the strongest storms capable of producing damaging winds up to 60 mph, frequent lightning, pea-sized hail, and torrential rainfall leading to localized flooding. Similar storm activity with gusty winds up to 50 mph is forecasted over the mountains in Colorado, spreading eastward. Northern California is also expected to experience chances of thunderstorms and rain showers over the northern Sacramento Valley, Coastal Range, southern Cascades, and Burney Basin through the weekend, with a 15-35% probability in some areas. Heavy rain and pea-sized hail have been reported in east central Minnesota, including parts of the southern Twin Cities metro area. Southern Wisconsin is forecasted to see repeated rounds of storms and heavy downpours through the weekend, raising the possibility of locally heavy rainfall. Residents in these areas are advised to stay updated with the latest forecasts due to the potential for hazardous weather conditions.