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600,000 american lives lost to covid. tonight, new concerns about the highly contagious delta variant first seen in india. now 90% of the cases in the uk. and authorities here warning it could become dominant in the u.s. and the new study tonight on how effective the vaccines are against this particular variant. from washington, d.c. up into the northeast at this hour, the severe storms as we come on the air tonight. also, the dangerous heat in the west. growing concern over the fire dangers. and we're also watching two tropical systems near the u.s. tonight. one off the east coast, the other in the gulf. rob marciano standing by. the chaos in midair. authorities say an offduty flight attendant threatening to take down the plane. the pilot calling on the intercom for passengers to help. overseas tonight, benjamin netanyahu is out after 12 years in office, out as prime minister by one vote. tonight, netanyahu now vowing to bring down the new government.