After strengthening on Thursday, what began as tropical storm Irma is now a Category 3 hurricane, and is expected to remain a powerful storm through the weekend, the National Hurricane Center said in its latest advisory.

Irma has maximum sustained winds of 115 miles an hour and is moving west of the Cabo Verde islands. The hurricane is moving in conditions that may allow it to intensify, said the advisory.

“There is the potential for Irma to ramp up to an even more powerful hurricane this weekend,” said AccuWeather Hurricane Expert Dan Kottlowski.

Hurricane Irma is expected to reach Category 4

He is expecting Irma to develop into a Category 4 hurricane before it reaches the Lesser Antilles. For now, there are no land or coastal warnings, and Irma is expected to take about a week to make its way across the Atlantic.

There is a wide range of possibilities for whether the hurricane reaches the U.S., or moves into the Gulf of Mexico, said AccuWeather.

Harvey is now a “posttropical cyclone” with heavy rain moving into the Ohio Valley, according to the National Hurricane Center. Flash flood watches and warnings are in effect in parts of northern Mississippi, western Tennessee, Kentucky, southern Indiana and southwest Ohio.

Flood warnings are still in effect for parts eastern Texas, including the Houston metro area and western Louisiana.

Harvey is now the costliest U.S. storm in history, with damages estimated at $190 billion.

Harvey is estimated to become the most expensive storm in U.S. history

The damage done and the human suffering caused by Hurricane Harvey is more evidence that the climate is changing, and highlights the insurance industry’s failure to address the impact, said Cynthia McHale, director of insurance at Ceres, a nonprofit that works with investors and companies.

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“As Harvey’s expansive and costly climate change-fueled impacts continue to unfold, we know that insurers may not pick up much of the tab for rebuilding Texas,” McHale said. “Insurers have been financing the fossil fuel industry – both through their underwriting of coal and oil and gas operations, and as major institutional investors with vast holdings in the sector.”

Read also:Here’s the damage Harvey is likely to cause — from the economist who called Katrina correctly

Allianz ALV, -0.50% , The Hartford HIG, -1.06% , Blue Cross Blue Shield Massachusetts and Munich Re are among those that have said they would continue in their efforts to meet Paris Agreement goals.

“Insurance companies by-and-large have failed to communicate the threat or respond adequately to the mounting risks of unabated climate change,” said McHale.