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Heat dome to send temperatures near or above 100 across south-central Pennsylvania

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A powerful heat dome is expected to bring dangerous, potentially record-breaking temperatures across much of the Midwest and eastern United States this week, with south central Pennsylvania forecast to see highs approaching or exceeding 100 degrees through the Independence Day holiday.

The National Weather Service says dangerous heat will expand across the eastern two-thirds of the country, with widespread high humidity pushing heat index values between 100 and 110 degrees in many locations.

The prolonged stretch of extreme heat is expected to affect states from the Plains to the East Coast, with parts of Iowa, Missouri and Kansas already under extreme heat warnings. Areas including Ohio, North Carolina and the Washington, D.C., region are also expected to experience hazardous conditions.

In south-central Pennsylvania, the hottest weather is expected Wednesday through Friday. Forecasts call for highs around 99 degrees on Wednesday, climbing to 102 degrees on Thursday before easing only slightly to about 101 degrees on Friday. Overnight lows are expected to remain in the mid- to upper 70s, offering little relief from the heat.

Meteorologists say the oppressive conditions are being caused by a heat dome, a weather pattern in which a strong area of high pressure traps hot air near the ground. Combined with high humidity, temperatures can feel significantly hotter than the thermometer indicates.

The National Weather Service warns that the greatest health risks will be for older adults, young children, people with chronic medical conditions and anyone working or exercising outdoors. Heat exhaustion, heat stroke, heat rash and dehydration are among the potential dangers.

Health officials recommend staying hydrated, wearing lightweight clothing, limiting strenuous outdoor activity during the hottest part of the day and spending time in air-conditioned buildings whenever possible. Residents are also encouraged to check on elderly neighbors, relatives and others who may be vulnerable to the extreme temperatures.

Officials caution that the danger will not end after sunset. Evening temperatures are expected to remain in the 80s and even low 90s in some areas, while high humidity will keep conditions uncomfortable during outdoor Fourth of July celebrations, including fireworks displays.

Forecasters say the heat is expected to persist beyond the holiday weekend in many parts of the country, with additional periods of dangerous temperatures possible into next week.

Source: NPR, The Weather Channel

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