Strong thunderstorms are expected to start north of Bangor on Friday afternoon, as skies across the state remain cloudy.
Those thunderstorms are just a precursor to severe heat indexes that will make temperatures feel like the high 90s and near 100 degrees next week.
With temperatures in the high 70s and humidity levels around 85 percent, severe thunderstorms are predicted to hit the central highlands, easternmost Penobscot and Aroostook counties, as well as some parts of Hancock and Washington counties throughout Friday afternoon. The storm system will likely be most severe in the Penobscot Valley region, according to National Weather Service forecasters.
Friday’s storms are expected to bring wind gusts up to 25 miles per hour, strong rain and the potential for small hail. As with previous storms this past week, flash flooding could occur, impacting roads and streams.
Southern Maine will see unsettled weather patterns throughout the evening, although the majority of the storm system will stay over the water off the coast, according to the Gray NWS station. Coastal York, Cumberland and Sagadahoc communities may experience high winds, hail and periodic downpours.
Skies will likely clear out for most of the state midmorning Saturday, with highs reaching the low 70s. Clear skies are predicted for Sunday, when highs will be in the mid- to high 70s.
Heading into next week, temperatures will be in the high 70s on Monday, with things really heating up Tuesday. The extended forecast predicts high 80s on Tuesday, but a deadly heat index will make temperatures feel like they are in the mid 90s to 100 degrees Fahrenheit.
Forecasters expect the heat wave to persist through to Thursday, although predictions may change through the weekend.
According to the NWS, the upcoming heat wave is expected to be the most significant heat wave event since 2020, when numerous heat records were broken and very little rain fell.
High heat indexes can be life threatening, and Mainers are warned to limit their time outside, as well as avoid strenuous activities when they can. You can avoid the worst effects of the heat by drinking water, staying in a well ventilated space with moving air and staying alert to any dizziness, cramps or shortness of breath, which are all signs of heat exhaustion.
