The week is shaping up to be warm and stormy, with a chance of thunderstorms in the forecast every day and the possibility of heavy downpours at times.

In the Midwest, quarter-sized hail and an isolated tornado cannot be ruled out, while in the South, flood alerts are in effect for areas that were devastated by flash floods last week.

Even with advances in technology, it’s difficult to pinpoint exactly where and when some of the most severe weather will occur until just before it happens.

Thunderstorms moving through Colorado’s mountains could bring heavy rain, large hail and wind gusts to parts of the south metro and Interstate 25 corridor.

A series of scattered thunderstorms and rising temperatures are forecast for New Jersey on Saturday night and again Sunday afternoon with potential for localized heavy rainfall. Widely scattered thunderstorms are possible Saturday evening, with the highest chance of precipitation west of the I-95 corridor.

A flash flood warning was issued by the National Weather Service on Saturday at 3:06 p.m. in effect until 6:15 p.m. for Adams County.

The Federal Aviation Administration on Friday afternoon ordered a ground stop for Denver International Airport. All departures to Denver are grounded through 4:15 p.m.

After an afternoon filled with tornado sirens, lightning strikes, torrential rain and visible cloud rotation near Iowa Speedway, IndyCar canceled Friday afternoon practice.