Hurricane Lee strengthened to a major Category 5 storm Thursday night, with forecasters predicting "dangerous beach conditions" around the western Atlantic.

Sunday: Partly sunny, hot and humid with a chance of scattered showers and storms possible. Highs in the low and mid 90s. Heat indices 100-110 degrees.

An Extreme Heat Warning goes into effect at 10 a.m. Friday through 9 p.m. for heat indices 105-110° in the Philadelphia area.