Slipping into the crystal blue waters off the coast of Jupiter, in Florida, Captain John Moore sees a large finned shape emerge from the depths.

It's a bull shark.

Rather than feel afraid, Moore is exhilarated.

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The ocean-lover works for tour operator Florida Shark Diving and free-dives with the apex predator four times a week – on average.

With camera in tow, he's providing a unique snapshot of the feared species.

He told 9news.com.au bull sharks are one of the most misunderstood animals on the planet.

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"Bull sharks have a reputation as a fierce and aggressive predator but in clear water, I find them to be one of the easiest sharks to interact with," he said.

"They are very intelligent, calm, and an absolute pleasure to spend time with.

"They are definitely a very misunderstood predator."

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In 2022, Moore had an encounter with a very large female bull shark – measuring more than 2.4-metres and over 315 kilograms – that went viral.

He says it was "a very memorable encounter on a long list of memorable moments".

"It came up from the deep ledge and obviously dwarfed the other bull sharks we had around at the time," he said.

"She was calm and confident and fed the food I offered with minimal hesitation. She clearly didn't view me as a threat.

"I'm guessing that she was pregnant as well based on her size and the shape of her belly.

"It was also late summer when they are heading inshore to pup."

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In Australia, bull sharks are in the "top three" target species involved in the most serious bites – along with great whites, and tigers.

Australian Museum says the bull shark "is one of the few sharks that are potentially dangerous to people and is probably responsible for most of the shark attacks in and around Sydney Harbour.

While Moore acknowledges this, he said it's not been his experience with the animals.

"They have certainly been responsible for attacks on humans, albeit rare, both in Australia and the United States," he said.

"Almost all negative interactions with bulls are likely a case of mistaken identity in murky water, or a competition situation while spearfishing.

"That said, they are still apex predators, and I am not suggesting swimming with them without shark experience or without a trained guide."

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A life-threatening cold spell began to ease its grip on the northeastern United States on Saturday, but only after a new national windchill record was set in New Hampshire.

The record was set at Mount Washington, the highest peak in the north east on Friday night when it felt like minus -77C (-108 F) thanks to a temperature of -44C (-46F) and wind gusts of 204km/hour.

Wind chill records are not historically tracked as closely as temperature records, but the mark would beat what most meteorologists believe to be the US record -76C (-105F) in Alaska).

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The prior record for Mount Washington was -74C (-102 F) in 2004.

Early on Saturday, about 15 million people in the United States were under wind chill alerts, but that number dropped to less than a million by midday as the extreme cold began to wrap up.

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The majority of the remaining wind chill alerts will end by Saturday night local time as temperatures begin to stabilize and winds die down.

Temperatures will rebound five to 10 F above normal on Sunday.

Several daily low-temperature records were set across portions of the Northeast on Saturday morning, according to local National Weather Service offices.

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Boston hit a morning low temperature of -23C (-10F) on Saturday morning, breaking its previous daily record of minus -18C (-2F).

The weather service also tweeted that it is the first double-digit negative temperature recorded since 1957.

Government leaders urged people to stay inside if at all possible.

"Our state is facing dangerously cold temperatures & extreme wind chills today & tomorrow," Gov. Kathy Hochul said Friday morning on Twitter.

"We are coordinating with local officials to ensure they have what they need to keep New Yorkers safe. Please limit time outdoors, wear layers, & use caution with alternative heat sources."

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Northern Maine feels the freeze

The dangerously cold winds are descending on the region from Canada, putting entire states at risk.

The worst impacts are expected in northern Maine – where about 70,000 people in Penobscot and Aroostook counties are under blizzard warnings through Saturday evening, according to the National Weather Service.

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"Ground blizzard conditions in heavy blowing snow are expected today through Saturday across open areas. Please to not drive if you don't have to!" the weather service in Caribou, Maine, said.

Maine State Police shared photos of deteriorating road conditions in Aroostook County on Friday and warned drivers that any area across the state with open fields and snow can expect periods of "blinding whiteouts."

"One of the beauties of the County is (its) open fields and views but on days like this they become a hazard. Drive safe. What looks like safe and normal driving conditions quickly deteriorate into almost zero visibility stretches of roadway," Maine State Police said in a Facebook post.

In addition to the blizzard conditions, parts of northern Maine on Friday night felt as cold as -56C -(69F), with many other areas seeing their winds feel as bitterly cold as between -37 (35F) to -45C (-50F), according to the weather service in Caribou.

The local weather service also reported some power outages in Maine, where water inside trees froze, expanded and caused trees to snap and knock down power lines – though impacts did not appear extensive or widespread on Friday.

Freezing temperatures this week have not only affected the Northeast.

Farther south, severe cold weather also led to ongoing power outages across Texas and Arkansas as an ice storm lashed the region, killing at least eight people.

About 130,000 homes and businesses in Texas were still in the dark early on Saturday stemming from multiple rounds of ice, sleet and freezing rain that made roads deadly and weighed down trees, also causing them to break and take down power lines.

In Arkansas, more than 36,000 homes and businesses were experiencing outages early Saturday, according to the tracking site Poweroutage.us.

Texas Gov. Greg Abbott issued a disaster declaration on Saturday for several counties that have been impacted by the ice storm, and additional counties may be included after damage assessments are conducted, the governor's office said.

"The State of Texas has provided all assistance requested throughout the severe weather this week, and we continue to ensure that communities across our state have the resources and support they need to recover from the winter weather event," according to a news release from Abbott's office.

The ice storm has caused "widespread property damage, hazardous travel disruptions, and local power outages," the release said.

Aid to those experiencing homelessness

Amid the ongoing dangerous cold in the Northeast, New York City issued a "cold blue" Friday evening, the city's Department of Homeless Services said on Twitter.

The designation generally indicates temperatures have reached an extremely low threshold that requires them to make resources available to the public.

Under that code, people may use the city's homeless shelter system on an emergency basis and directs New Yorkers to report people on the street as a safety measure.

"No one who is experiencing homelessness and seeking shelter in New York City during a Code Blue will be denied," a spokesperson for the department said.

New York City is forecast to see single-digit temperatures, with the coldest point coming Saturday morning at -13C (8F) and winds could feel as cold as -21C ( -7F) below zero.

"Homeless outreach teams will be talking to any New Yorker on the street and offering them warm shelter," the city said on Friday in a tweet.

In Erie County – home to Buffalo – officials also issued a "code blue" and opened three overnight shelters in the county and daytime warming centers.

Warming centers have also opened across Connecticut, Maine, New Hampshire, Rhode Island, Massachusetts and Vermont, officials said.

In New Hampshire, where the coldest winds could feel as low as -xx C (-40F), Cannon Mountain Ski Resort in Franconia and Wildcat Mountain in Gorham have closed due to the severe cold, according to their Facebook pages.

Similarly, several ski areas turned away customers and shut down operations in Vermont on Friday.

The man was a ‘hard-working, loving, caring’ father-of-three, his son says.

Perth residents have paid their respects at the scene of a shark attack on the Swan River which took the life of a teenager.

Sixteen-year-old schoolgirl Stella Berry was mauled by the shark in front of horrified friends at Fremantle on Saturday afternoon.

The Year 11 student had been riding a jet ski at Fremantle when she jumped in the water

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She was approached by the suspected bull shark and attacked.

The tragedy has hit Perth residents hard, including David Hopkins who lost a family member to a similar incident.

"I lost my nephew on Lord Howe Island about five years ago," Hopkins said.

While sharks live near the popular swimming spot, attacks are incredibly rare.

One expert from Australian Marine Conservation Society said the attack was random and the teenager in the wrong place at the wrong time.

"It's exceptionally rare, which is what I suppose makes it all the more tragic," Dr Leo Guida said.

The last attack was two years ago, when Cameron Wrathall bitten on the leg by a bull shark.

The latest tragedy has hit home.

"The family must be devastated, I felt very upset for them," he said.

"It stirred up some uncomfortable feelings for myself also."

Berry's school offered its condolences in an email sent to parents earlier today.

Shenton College principal Michael Morgan said the school's student support team which includes chaplains, nurses and psychologists, will be available to support students as required.

"I understand and respect that people respond to grief and loss in different ways, and that a loss such as this can trigger a broad range of emotional responses that are not always anticipated or evident," he said.

"I have personally offered, on behalf of the college, our condolences and support to Stella's family during this very sad time."

Berry's sister Mae is also a student at the school.

Stella's parents Matt and Sophie Berry were teachers at other schools in Perth, WAtoday reported.

It's believed Stella jumped into Perth's Swan River to swim with dolphins when she was attacked, police say.

She was pulled from the water with leg injuries about 3.30pm on Saturday, but died at the scene.

The incident is believed to be the first fatal shark attack in the waterway in 100 years.

Fremantle Mayor Hannah Fitzhardinge, who was swimming nearby at the time, said the incident rattled the community.

"This is an absolute tragedy," she said.

"People were just trying to cool down and we were even swimming just around the corner in the river and you don't expect something like this would happen.

"This always rattles people when something unexpected and horrible happens."

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WA Police Acting Fremantle District Inspector Paul Robinson said she was riding with friends on jet skis near the Fremantle traffic bridge before the "tragic" attack.

"What we're being advised is she was with friends on the river, they were on jet skis and possibly a pod of dolphins were seen nearby and the young female jumped in to swim nearby the dolphins," Robinson said.

"It's an extremely traumatic event for everyone involved and everyone who knew the young girl, so I won't be going into the extent of the injuries.

"It is unusual for a shark to be that far down the river, at this point in time an alert has been put out, a shark warning just to let people know this incident has taken place."

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Another witness, Joshua, 16, was with a group of friends who were swimming in the river when the incident happened.

He was jumping from the old Fremantle traffic bridge rope swing when swimmers started rushing to the shore.

"There were about seven of us and we were on the rope swing for around an hour or two," he told WA Today.

"We saw the dolphins, there were dolphins there. When all the police came by we thought we were in trouble.

"Another person then came over on a jet ski and told us to get out of the water."

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