A multiday heat wave is bringing high temperatures and health risks from the Midwest to the Northeast, prompting warnings and emergency measures.

A dangerous and prolonged heat wave is set to impact central Pennsylvania, with heat index values potentially reaching 105 degrees and an Extreme Heat Warning in effect for several counties through Wednesday.

Major cities across the United States are preparing for extreme temperatures caused by a heat dome that hit the U.S. Plains on Friday and is expected to expand to much of the rest of the country over the coming days.

Chicagoans can expect intense heat compounded by muggy humidity for the next several days. The National Weather Service has declared an extreme heat warning in Cook County from

Meteorologist Kylee Miller has the latest First Alert Weather forecast. Featured Israel-Iran Updates Heat Wave Forecast NBA Playoffs S

Mark Strehl has your weather update!