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

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.