Tropical conditions will take hold, with a dangerous heat index today and tomorrow 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 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.

TONIGHT

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 upper 70s to the lower 80s in urban areas.

TOMORROW

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.

TOMORROW NIGHT

A cold front will continue to press southeastward with scattered clouds and isolated thunderstorms.  Winds will be from the southwest at 5 to 10 mph.  Low temperatures will range from the upper 60s to lower 70s over the interior, lower to mid-70s in the suburbs, and upper 70s to lower 80s in urban areas.

THURSDAY

A cold front will stall over the region with scattered showers and thunderstorms.  The thunderstorms will be capable of heavy downpours, frequent lightning, and wind gusts over 40 mph.  Winds will be from the northeast at 1 to 5 mph.  High temperatures will range from the upper 70s to the mid-80s over the interior, from the mid to upper 80s in the New York City metropolitan area, and from the lower to mid-90s in the Philadelphia metropolitan area.

FRIDAY

An area of low pressure along the cold front will produce periods of heavy rainfall.  Winds will be from the northeast at 5 to 15 mph.  Low temperatures will range from the lower to mid-60s over the interior, mid to upper 60s in the suburbs, and upper 60s to lower 70s in urban areas.  High temperatures will range from the upper 60s to lower 70s over the interior and lower to mid-70s along the coast.

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 mid to upper 70s over the interior and upper 70s to the lower 80s along the coast.

MONDAY

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 mid to upper 70s.

TUESDAY

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 mid to upper 70s over the interior and upper 70s to the lower 80s along the coast.