Good Afternoon. Extreme heat and humidity is forecast to continue on Sunday. We expect heat indices to range from between 105 and 115 degrees during the afternoon. Lows tonight will also remain very warm and humid which may exacerbate heat related issues. We have attached images of the expected maximum heat indices for tomorrow. *New: Monday afternoon into Tuesday will bring heavy rainfall to the region with potential for some strong to severe storms and localized flooding. *Please let us know if you have any questions or concerns. *No Changes To Current Headlines ...* - Excessive Heat Warnings continue for most of Massachusetts, all of Connecticut and Rhode Island through the weekend. - Heat Advisories continue for Berkshire County, Cape Cod, and Martha's Vineyard through the weekend. *What/When/Where ...* - Extreme heat and humidity continues on Sunday across all of southern New England, except for Nantucket and Block Island. - Maximum Heat Index values between 100 and 110 degrees for most of the region, Heat Index Values between 96 and 104 degrees across Berkshire county, Cape Cod and Martha's Vineyard. *Relief From The Heat/Humidity ...* - The extreme heat should be finished by Monday, although it may still get rather warm and humid with highs well up into the 80s to near 90. - Humidity levels will diminish on Monday from oppressive to noticeable. - More significant relief arrives late Tuesday and Wednesday. *Thunderstorms / Heavy Rain / Flooding Potential ...* - Chance of heavy downpours, localized urban and poor-drainage flood risk Monday afternoon through Tuesday. - A few strong to severe storms are possible Monday afternoon into Monday night, mainly along and south of the MA Pike. 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>