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Data: Renaissance Capital; Chart: Axios Visuals

Known unknowns abound about the Saudi Aramco IPO expected this year on Saudi Arabia's' domestic exchange, including what the offer price will be and just how much of the company will be floated.

The big picture: Even still, the expected sale of just a tiny percentage of the company valued at well over a trillion dollars could be the biggest IPO in history.

Go deeper: New Aramco IPO prospectus touts strengths amid investor questions

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NOAA warns of potential for "extremely active" Atlantic hurricane season

Hurricane Isaias makes landfall in Garden City, South Carolina. (Photo by Sean Rayford/Getty Images)

National Oceanic and Atmospheric Administration forecasters warned Thursday of the potential for an "extremely active" hurricane season in the Atlantic.

The big picture: The agency expects 19 to 25 named storms — with three to six major hurricanes — during the six-month hurricane season, which ends Nov. 30. The average season produces only 12 named storms.

New York AG files lawsuit to dissolve NRA

Wayne LaPierre. Photo: Saul Loeb/AFP via Getty Images

New York Attorney General Letitia James filed a lawsuit Thursday to dissolve the National Rifle Association, alleging the group committed fraud by diverting roughly $64 million in charitable donations over three years to support reckless spending by its executives.

Why it matters: The NRA is the most powerful gun lobby in the country and receives a huge amount in donations each year, but New York's investigation claims that CEO Wayne LePierre and other top leaders undermined the organization's mission for their own personal benefit.

33 mins ago - World

How 2,750 tons of ammonium nitrate were stranded in Beirut

The port after the explosion. Photo: AFP via Getty Images

On Sep. 23, 2013, a Russian-owned, Moldovan-flagged ship departed Georgia en route to Mozambique bearing 2,750 tons of ammonium nitrate, a material used in fertilizer as well as explosives.

Why it matters: The Rhosus made an unscheduled stop in Beirut, apparently due to engine problems. The ammonium nitrate never left the port, but destroyed it nearly seven years later, along with much of the city.