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Marblehead is heading into a stretch of dangerous heat that will run through most of the holiday weekend, with high temperatures, heavy humidity and warm nights expected to pile up day after day.
The National Weather Service has issued an extreme heat warning for Eastern Essex County from 10 a.m. Wednesday through 8 p.m. Saturday. Afternoon heat index values could reach 98 to 112 degrees. The warning covers Marblehead and much of southern New England, and forecasters expect the worst of it Thursday and Friday.
Being on the water helps a little. The sea breeze should keep Marblehead a few degrees cooler than inland towns, with highs near 89 Wednesday, 87 Thursday and Friday, and 91 on July 4. But the relief is limited, and it mostly disappears at night. Overnight lows are forecast to stay in the upper 60s and 70s, which gives people little chance to cool off after dark.
That is the part forecasters are most worried about: Heat builds up over several days, and without a cool night to recover, the strain adds up, they say. Someone who feels fine Wednesday can be in real trouble by Friday. The National Weather Service warns that heat-related illness rises sharply during long stretches of high heat and humidity like this one.
Fire Chief Jason Gilliland said the Council on Aging in the Judy and Gene Jacobi Center at 10 Humphrey Street offers a cooling station open from 9 a.m. to 5 p.m. on hot days. An additional emergency cooling station operates 24 hours a day at the Lucretia and Joseph Brown School at 40 Baldwin Road during heat events, though residents must call 781-631-1212 to arrange access as staffing is provided only as needed. Gilliland noted that no food will be provided at either location.
Gilliland said the fire department will use the ladder engine to spray kids with water Thursday at 4 p.m. at the Community Center at 10 Humphrey St. The parking lot will be closed during the event; residents should park on the street.
Jonathan Blair, general manager of the Marblehead Municipal Light Department, urged residents to take precautions during the dangerous heat while also helping reduce stress on the electrical grid. He emphasized that residents should stay hydrated, wear lightweight clothing and know which air-conditioned public spaces are available, including the Community Center, which is open Wednesday through Friday from 7 a.m. to 5:30 p.m., and Abbot Library.
Blair also asked residents to reduce discretionary electrical demand between 4 p.m. and 8 p.m. by pre-cooling homes in the morning hours, avoiding electric heating sources like clothes dryers and stoves, powering down idle devices and charging phones and vehicles late in the evening or overnight. He suggested residents close blinds and curtains to avoid solar heating and keep homes cooler during peak demand hours.
The Massachusetts Emergency Management Agency is urging residents to stay in air-conditioned spaces when they can, avoid hard outdoor work during the hottest hours, wear light clothing, drink water and check on neighbors, older adults, young children and anyone with a medical condition. People without air conditioning at home can cool off at a library, store or other public building.
State health officials say the risk gets serious fast. The Massachusetts Department of Public Health says three straight days of 85 degrees or higher tend to drive a sharp rise in emergency room visits and heat-related illness. Marblehead is forecast to top that mark Wednesday through Saturday.
Officials also remind residents never to leave children or pets in a parked car, even for a minute, and to know the warning signs. Heavy sweating, weakness, dizziness, nausea and headache can mean heat exhaustion. Confusion, fainting, a very high body temperature or hot, dry skin can mean heat stroke, which is a medical emergency. Anyone seeing those signs should call 911.
The heat lands during one of the busiest weekends of the year. The Marblehead Festival of Arts, in its 60th year, runs Wednesday through Sunday with art, music and film at venues around town, much of it outdoors. The Fourth brings its own traditions: the Horribles Parade at 10 a.m., the harbor boat parade later that morning, the harbor illumination at 8:45 p.m. and fireworks from a barge at 9. This year the reading of the Declaration of Independence Abbot Hall, 188 Washington St. (formerly the Old Town House), set for 11:30 a.m., also marks 250 years of American independence.
The forecast adds another complication. Along with the heat, there is a chance of thunderstorms Wednesday through Saturday, including the possibility of a heavy storm on July 4.
For now, officials are pushing the basics: keep errands short, move outdoor work to the cooler parts of the day, drink water and look in on anyone who may not have an easy way to cool down. The heat is expected to ease Saturday evening, once the warning expires.
