toxic smoke from the canadian wildfires. threatening the health of some 80 million americans. this image, the new york city skyline earlier today, obscured by the haze. we are told the haze could be even worse come tomorrow. here is abc s trevor ault tonight. reporter: wildfire smoke seeping across the border from canada threatening the health of 80 million americans. the haze coming downstream, the thickest haze and smoke is during evening hours and the air quality is only going down. reporter: more than 400 active wildfires are burning across canada, half of them still out of control. the giant plumes of smoke rendering new york city s skyline practically invisible. further north in syracuse and rochester, new york, the air quality is even worse. it smelled like, you know, our neighbors might be having a campfire and it s just kind of an eerie feeling. reporter: medical professionals warning poor air quality is already impacting people. the immediate health risks are wors
warnings from california to wisconsin. and that s just the cold side. the front side has severe storms, which are going to pop up tonight in parts of oklahoma, arkansas, even there in missouri, but then, we take it into the flash flooding. especially tuesday afternoon. watch as that line moves through little rock, memphis, paducah and then gets to the east coast. to see rain with that one, but - the next one, david, we ll talk more winter precipitation. ginger zee will be watching it first thing in the morning, thank you. we also have news on covid and the pandemic tonight. the fda is now looking at the ability of authorizing a fourth dose of vaccine, another booster after one study showed that the third shot, that booster, offered 91% protection against hospitalization, very effective, but also that it falls to about 78% after four to five months. so, how to deep the progress after this omicron wave is over? here s trevor ault tonight. reporter: tonight, growing signs another co
and david, the fda has not given a specific timeline for a decision on a fourth shot, but dr. fauci says they re carefully monitoring the need in real time and will update their recommendations as the new data comes in. david? trevor, thank you. and this evening, queen elizabeth is now in isolation after testing positive for covid. it comes after prince charles and camilla got covid. and tonight, they say the 95-year-old queen so far is experiencing mild symptoms. abc s lama hasan from london. reporter: tonight, the queen isolating behind castle walls after buckingham palace revealed she s experiencing mild cold-like symptoms after testing positive for covid-19. the palace is simply saying, look, she s okay, she s got mild symptoms. she s been they ve not confirmed it, but she s been vaccinated three times, so, there s no real cause for alarm. reporter: it comes amid growing concerns for the health of her majesty after prince charles and camilla both recently tested positiv
and the focus this week on \gabby petito s disappearance leads to many questions about many other missing people across the country. here s trevor ault tonight. reporter: tonight, investigators again hunting through the treacherous terrain of florida s carlton nature reserve hoping to find and now arrest gabby petito s boyfriend brian laundrie following a federal indictment. but brian s now been missing for ten days. he is charged with unauthorized use of a debit card to allegedly withdraw money after gabby s death. but as for her homicide and disappearance, he s still considered simply a person of interest. do you have any comment, mr. laundrie? reporter: thursday daily mail cameras capturing laundrie s parents traveling to orlando to meet with their attorney. and the intense focus on gabby s disappearance igniting new interest in other missing person cases often overlooked because they re from minority communities. in 2020, 45% of the fbi s 89,000 missing persons cases