The very humid conditions continue overnight, and will lead to more areas of fog. Patchy dense fog is expected, reducing visibility to one quarter mile or less in spots. Travelers should be prepared for rapid drops in visibility. Slow down and allow extra time to reach your destination safely.

* WHAT. Heat index values up to 97 expected. * WHERE. In Connecticut, Hartford, Tolland, and Windham Counties. In Massachusetts, Southern Worcester, Central Middlesex, Western Norfolk, Northern Bristol, and Western Plymouth Counties. In Rhode Island, Providence County. * WHEN. From noon Monday to 8 PM EDT Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values of 95 to 100 expected. * WHERE. In Connecticut, Northern Fairfield, Northern Middlesex, Northern New Haven, Northern New London, Southern Fairfield, and Southern New Haven Counties. In New York, Northern Nassau and Northwest Suffolk Counties. * WHEN. From noon Monday to 8 PM EDT Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS. The highest heat index values will be generally in the afternoon and early evening hours.