Extreme Heat Warning in effect from noon on Wednesday until 9 p.m. Friday for much of the Hudson Valley. Dangerous heat with afternoon heat index values between 100 and 110 degrees. Little overnight relief is expected.

Extreme Heat Watch in effect from 9 p.m. Friday to 9 p.m. Saturday

Air Quality Alert: For Rockland and Westchester counties from 11 a.m. to 11 p.m. Today due to high levels of ground-level ozone.

Overnight: Partly cloudy with a slight chance of showers and thunderstorms during the evening, then dry overnight. Lows in the upper 60s to around 70.

Today: Mostly sunny, hot and humid. A slight chance of an afternoon shower or thunderstorm. Highs in the low to mid-90s with heat index values around 100 to 105.

Tonight: Partly cloudy and warm with a slight chance of an evening shower or thunderstorm. Lows in the low to mid-70s.

Thursday: Sunny, dangerously hot and humid. Highs around 100 degrees with heat index values between 105 and 115.

Thursday Night: Clear and very warm. Lows in the mid- to upper 70s.

Friday: Mostly sunny and dangerously hot. Highs near 100 degrees with heat index values again above 100.

Independence Day: Partly to mostly sunny with scattered afternoon and evening showers and thunderstorms developing. Highs in the low to mid-90s.

Saturday: Partly sunny with scattered showers and thunderstorms possible. Highs in the upper 80s.

Sunday: Partly sunny with scattered afternoon showers and thunderstorms. Highs in the upper 80s.

Monday: Partly sunny with scattered showers possible. Highs in the lower 80s.

Tuesday: Mostly sunny with seasonably warm temperatures. Highs in the low to mid-80s.