Good morning everyone, Outlined below are potential weather hazards this afternoon and evening. *What ...* Potential severe thunderstorms with torrential downpours, localized flooding, and strong winds are possible. Also, excessive heat and humidity is expected this afternoon with heat indices approaching or exceeding 100 degrees, thus a Heat Advisory has been posted for a portion of the area. *Where ... *For severe thunderstorms, all of Connecticut into northern Rhode Island and all of northern Massachusetts including the city of Boston. The risk of strong storms is lower across the south coast of MA and RI. A heat advisory has been posted for northeast Massachusetts including Metro-West. *When ... *The risk for potential severe thunderstorms exist between 1 pm and 10 pm, however the greatest risk is between 4 pm and 8 pm. Heat indices approaching or exceeding 100 degrees will occur between 1 pm and 5 pm today. *Forecast Uncertainty ... *areal coverage of strong thunderstorms is not quite clear. Current thinking is storms will be scattered, meaning one town can be impacted by torrential rainfall and localized flooding while a neighboring town has very little to no impact. The threat for strong storms appears to be highest across CT, into northern RI and across all of northern MA including the city of Boston. As for heat indices, depending on the amount of cloud cover today, the combination of very warm temperatures and tropical humidity, heat indices will likely approach or exceed 100 degrees. Attached are four graphics to help communicate the areal threat of strong thunderstorms, heavy rainfall/flooding and heat advisory. Frank Nocera & Bryce Williams If you have any questions or would like more information, don't hesitate to contact us via this email address, on NWSChat <https://nwschat.weather.gov/>, or at the following: National Weather Service Boston/Norton, MA 46 Commerce Way Norton, MA 02766 508.622.3280 Website <http://www.weather.gov/boston> | Facebook <http://www.facebook.com/NWSBoston> | Twitter <http://www.twitter.com/NWSBoston>