Good afternoon everyone, Excessive heat and humidity arrives Friday and peaks this weekend. Heat index values will approach or even exceed 110 degrees in some locations Saturday and Sunday afternoons. This is dangerous heat and humidity and relatively rare for this part of the country. We have attached an image of the Heat Headlines issued along with the maximum heat index values anticipated Friday, Saturday and Sunday. It is not only heat during the day, but the lack of cooling at night which will be problematic. Fortunately, much cooler air arrives Monday. *Headlines ...* - Excessive Heat Warnings issued for most of Massachusetts, Connecticut and Rhode Island. - Heat Advisories issued for Berkshire County, Cape Cod, and Marthas Vineyard. *What ...* - Excessive heat and humidity begins Friday afternoon and peaks Saturday and Sunday afternoons. - Heat Index Values between 95 and 100 degrees Friday afternoon. - Heat Index Values between 107 and 112 degrees on both Saturday and Sunday afternoons for most of the region with values between 96 and 102 degrees across Berkshire county, Cape Cod and Marthas Vineyard. *Where ...* - Heat headlines in effect for all of southern New England except Nantucket beginning Friday afternoon and continuing through the weekend. *When ... * - Friday afternoon through early Sunday evening. - Much cooler and less humid Monday. Please let us know if you have any questions or concerns. Thank You Meteorologist: Hayden Frank 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>