Most of Massachusetts under dayslong heat advisory, Boston declares heat emergency

Greater Boston faces a heat wave, leading Mayor Michelle Wu to declare a heat emergency from Wednesday through Friday. High temperatures are forecasted to reach the low 90s, with a heat index potentially exceeding 100 degrees due to high humidity. StormTeam 5 meteorologist Mike Wankum noted that dew points in the low 70s will exacerbate the heat's impact. While Friday may see some improvement in humidity, temperatures will still hover around 90 degrees. The heat advisory issued for most of Massachusetts highlights the urgency of the situation.

Cooler air is expected to arrive by Saturday, bringing relief with temperatures falling into the 80s. This change is essential for public health, especially for vulnerable populations during extreme heat events. Residents are advised to stay hydrated and take precautions during the heat emergency.