Tropical conditions will take hold to start the week, with a dangerous heat index tomorrow and Wednesday in the 100s.  Widespread heavy rainfall is expected to return at the end of the week, posing a threat of flooding.

TODAY

High pressure will produce clear skies.  Winds will be from the northwest at 1 to 5 mph.  High temperatures will range from the mid to upper 80s over the interior, lower to mid-90s on the I-95 corridor, and upper 80s to lower 90s along the coast.  A heat index in the mid-to-upper 90s is expected.

TONIGHT

High pressure will produce scattered clouds.  Winds will back to the southwest at 1 to 5 mph.  Low temperatures will range from the mid- to upper 60s over the interior, from the upper 60s to the lower 70s in the suburbs, and from the lower to mid-70s in urban areas.

TOMORROW

High pressure will produce scattered clouds.  Winds will be from the southwest at 5 to 10 mph.  High temperatures will range from the upper 80s to lower 90s over the interior, mid to upper 90s on the I-95 corridor, and lower to mid-90s along the coast.  A heat index in the upper 90s to mid-100s is expected.

TOMORROW NIGHT

High pressure will produce scattered clouds.  Winds will be from the southwest at 1 to 5 mph.  Low temperatures will range from the upper 60s to the lower 70s over the interior, from the lower to mid-70s in the suburbs, and from the mid to upper 70s in urban areas.

WEDNESDAY

A cold front will approach the region with increasing clouds in the morning, followed by widely scattered showers and thunderstorms in the afternoon.  Winds will be from the southwest at 5 to 10 mph.  High temperatures will range from the upper 80s to lower 90s over the interior, mid to upper 90s on the I-95 corridor, and lower to mid-90s along the coast.  A heat index in the mid-90s to mid-100s is expected.

THURSDAY

A cold front will stall over the region with waves of heavy rainfall and tropical thunderstorms.  Winds will be from the northeast at 1 to 5 mph.  Low temperatures will range from the upper 60s to the lower 70s over the interior, from the lower to mid-70s in the suburbs, and from the mid to upper 70s in urban areas.  High temperatures will range from the upper 70s to the lower 80s over the interior, from the lower to mid-80s in the New York City metropolitan area, and from the upper 80s to the lower 90s in the Philadelphia metropolitan area.

FRIDAY

An area of low pressure along the cold front will produce periods of heavy rainfall.  Low temperatures will range from the mid- to upper 60s over the interior, from the upper 60s to the lower 70s in the suburbs, and from the lower to mid-70s in urban areas.  High temperatures will range from the lower to mid-70s.

SATURDAY

High pressure will produce scattered clouds.  Low temperatures will range from the mid-50s to the upper 50s over the interior, from the upper 50s to the lower 60s in the suburbs, and from the lower to mid-60s in urban areas.  High temperatures will range from the lower to mid-70s over the interior and mid to upper 70s along the coast.

SUNDAY

High pressure will produce scattered clouds.  Low temperatures will range from the mid-50s to the upper 50s over the interior and from the lower to mid-60s along the coast.  High temperatures will range from the upper 70s to the lower 80s.

MONDAY

High pressure will produce scattered clouds.  Low temperatures will range from the upper 50s to the lower 60s.  High temperatures will range from the upper 70s to the lower 80s.