The chances for severe thunderstorms Sunday are higher in northern New Jersey counties. Damaging wind is the main concern, but localized flooding is also possible.

CURRENTLY TRACKING: Period of showers and thunderstorms through Thursday along with hot and humid conditions on Wednesday.

A HEAT ADVISORY will go into effect for all of northern Illinois and southern Wisconsin beginning Wednesday morning as afternoon heat index values surpass 100 degrees, rising as high as 105-108

The National Weather Service forecasts a significant heat event starting Friday, with heat indexes potentially exceeding 100 degrees across much of New Jersey. Thunderstorms are likely to develop Friday afternoon and evening as the cold front approaches, with continued shower and storm chances through the weekend.

Wednesday and Thursday bring widespread thunderstorms across southern Colorado. We begin to dry out on Friday and into the weekend.

Central Pennsylvania is bracing for a significant heat wave that will peak Friday, with temperatures and heat index values expected to reach dangerous levels, potentially triggering a heat advisory and heat risk across the region.

A flood advisory is now in effect for parts of Hamilton County, Ohio, and Boone, Kenton and Campbell counties in Kentucky along the Ohio River.

Denver's moisture increase brings potential thunderstorms and gusty winds, with a 60% chance of rain and highs up to 92 degrees.

An updated report from the National Weather Service was issued on Tuesday at 2:16 p.m. for strong thunderstorms until 2:45 p.m. for Henry and Houston counties.