Storms possibly cause two fires in Eagan, Minn.

Three firefighters have been injured and several families displaced after thunderstorms are thought to have caused two fires in Eagan, Minn.

The first call came at the Shannon Glen condos at 1:25 a.m. Saturday. While there, firefighters received a second call for a fire at a four-plex just two blocks away.

In a statement, the Eagan fire department said three firefighters were treated for exhaustion at the site of the first fire, where the Red Cross helped six displaced families.

Eagan fire officials called the fires "significant." Crews were on the scene until 5 a.m.

The department said the Eagan Fire marshal is investigating, but both fires were likely caused by storm activity.

Thunderstorms dropped softball-size hail and generated tornado warnings in southeastern South Dakota but didn't appear to cause much significant damage.

The National Weather Service's Katie Ewy said the 4-inch hail was reported Saturday afternoon about 11 miles southwest of Mitchell, S.D. Farther south, hail nearly 3 inches in diameter was reported near Tyndall, S.D.

But Mitchell Police spokesman Paul Paulson said the largest hail reported in Mitchell was marble-size.

Ewy said the storm generated rotation in its clouds as it moved east of Mitchell, but no tornadoes were reported.

The storm moved off into Minnesota by midafternoon Saturday, so the tornado warnings were allowed to expire.

A tornado watch was in effect until 10 p.m. Saturday for central, east central, south central and southeastern Minnesota and for northwestern and west central Wisconsin.

In the Grand Forks area, showers and thunderstorms are expected to taper off by tonight.

A mostly dry week is expected, with mostly sunny to partly cloudy skies today through Thursday and again Saturday, with a slight chance of showers and thunderstorms Friday and Saturday.

Highs are expected to be mostly in the 80s, but Wednesday may see highs in the lower 90s, forecasters said.