A major heat wave will grip close to three dozen states in the days leading up to the Fourth of July and could put millions at risk for heat-related illness.

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Millions of Americans will face a mix of heat, thunderstorms and wildfire smoke over Independence Day weekend, with weather threatening travel delays and outdoor celebrations across parts of the U.S.

Also, decades of whale photos helped researchers identify two humpbacks that moved between breeding grounds on opposite sides of the Southern Hemisphere, a rare crossing documented between Australia and Brazil.

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Warm Atlantic and Gulf waters, combined with the edge of a building heat dome, could allow storm clusters to organize into a tropical system as July begins.

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Extreme temperatures have contributed to deaths, prompted school closures and driven residents to cooling spots across France.

Also, conditions conducive for explosive and highly dangerous wildfire development will unfold later this week and persist through this weekend over a large part of the interior western United States.

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The tragedy underscores a critical danger that no one should ever take for granted. A vehicle can reach lethal temperatures within minutes. Every parent and caregiver needs to make hot vehicle safety a priority. Never leave a child unattended in a vehicle, even for a moment.

arts of the central and eastern United States will become as hot as a firecracker in the days ahead of Independence Day. Thunderstorms will provide some natural fireworks on the rim of a large building heat dome.

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The state of Illinois has already seen more tornado reports than it has in any year since records began, while "tornado alley" states are lagging behind this year in the annual tornado tally.

Also, a lake in Venezuela the size of Connecticut sits under constant thunderstorms for most of the year, making it the lightning capital of Earth.

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The first days of summer will sizzle along the Interstate 5 corridor with temperatures set to return to the 90s F early week.

Also, Grand Canyon National Park officials are warning visitors of the dangerous weather conditions that happen on a near daily basis during peak travel season.

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A tropical cyclone that pummeled the Indonesian Island of Sumatra last November, bringing catastrophic flooding and devastating landslides wiped out more than 7% of the global population of the endangered Tapanuli orangutans.

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Scientists warn that warming Pacific Ocean waters and marine heat waves fueled by El Niño could impact marine life, including sea lions, seabirds and sharks.

For the latest on Tropical Rainstorm Arthur check here.

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A tropical rainstorm that has been gathering downpours along the Texas coast is forecast to evolve into Tropical Storm Arthur. Regardless, torrential rain will lead to life-threatening flooding in the Southeast.

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