Strong to severe storms were expected to arrive out west in the afternoon, with damaging winds, hail and tornadoes all possible. Localized flooding is also a threat. The Twin Cities will see those storms later in the evening, likely after 9 p.m.

Hurricane Iona formed on Monday after undergoing rapid intensification. Shortly after Iona formed, Tropical Storm Keli also took shape. Both storms are considered part of the Central Pacific season. Meanwhile, two more named storms could join them in the coming days as NHC meteorologists monitor two disturbances in the Eastern Pacific.

Tropical Storm Iona formed in the central Pacific and is expected to continue trekking toward the west over warm, open waters well south of Hawaii.

The National Hurricane Center said it was expected to move steadily westward over the next several days, staying well south of Hawaii.

Severe thunderstorms were expected Monday over parts of the Northern Plains as forecasters warned of hurricane-force winds associated with a likely derecho — a fast-moving, long-lasting line of viole...