A rare "mega" heat dome is tightening its grip over the United States as Europe battles record-breaking heat, sending temperatures soaring and raising fresh concerns over the growing danger of extreme weather. Millions face blistering conditions as forecasters warn of intense heat and humidity across vast areas. The extraordinary weather pattern has formed after two separate high-pressure systems merged into one powerful atmospheric event. One system is centred over the US Southwest, while the other is being influenced by the subtropical Atlantic, creating a combined heat dome that is trapping scorching air across a large portion of the country. Meteorologists have described the merged system as an unusual atmospheric event. The heat dome is expected to keep temperatures locked at extreme levels by preventing cooler air from moving into affected regions. The impact is already being felt across the United States. Temperatures are climbing above 100°F in many areas, while heat index values are forecast to exceed 105°F in several major cities, making conditions feel even more dangerous. At the same time, Western Europe is enduring its own spell of exceptional heat. A powerful Omega block weather pattern has become established, drawing intensely hot air northwards from North Africa and preventing cooler air from breaking through. That atmospheric block is allowing extreme temperatures to persist across the region instead of easing. As a result, record-breaking heat continues to grip parts of Europe. Scientists say these events are becoming increasingly common. They report that a warming climate is causing heat domes to develop more frequently, last longer and become more intense than in the past. Researchers link those changes to rising global temperatures driven by human-caused climate change. They say the continued burning of fossil fuels is making heatwaves hotter, longer-lasting and more frequent, increasing their impact around the world. The growing intensity of these extreme weather events is also increasing the risks to public health. Prolonged exposure to high temperatures can lead to serious illnesses, including heat exhaustion and heat stroke. In response, the US National Weather Service has issued Extreme Heat Watches for parts of the Northeast. The agency warned that dangerously hot and humid conditions could create significant health risks for people exposed to the heat. Officials are urging residents to take precautions as temperatures continue to rise. People are being advised to stay hydrated, avoid strenuous activity during the hottest part of the day and seek shade or cool indoor spaces whenever possible. Mega heat dome grips US as Europe swelters in record heat
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