The National Hurricane center says there's an 80% chance of tropical formation within 48 hours and a 90% chance within seven days.

The Atlantic basin may have been quiet going into the peak of hurricane season, but a new storm is expected to develop in the region in the coming days.

Tropical Storm Gabrielle could form this week, while Mario could bring rain to Southern California in the Pacific.

Chances of a hurricane forming in the Atlantic have increased to 90 percent in the latest predictions from the National Hurricane Center. The past week has seen an increased chance of weather in the Atlantic developing into a tropical storm, which would be called Gabrielle, with some forecasts showing a westward track toward the Caribbean.

Storm Team 10 and the National Hurricane Center are monitoring two tropical waves in the Atlantic Ocean. The most robust wave has a high likelihood of becoming a tropical system within the next two days as the NHC has a 90% chance for tropical development.

The National Hurricane Center (NHC) says Invest 92L is continuing to become better organized and is likely to become a tropical depression or Tropical Storm Gabrielle within the next day or two as a new tropical threat emerges off the coast of Africa in the Atlantic.

One of the three weather systems is likely to strengthen into Tropical Storm Gabrielle and is currently in the mid-Atlantic.

The National Hurricane Center on Monday bumped up again its forecast chances that a tropical wave in the Atlantic would develop into the season’s next tropical depression or storm.

Tropical Storm Mario could send tropical moisture into Southern California and the Southwest this week, raising the risk for showers, storms and flash flooding.

Computer "spaghetti" model runs and meteorologists flagged an eastern Atlantic disturbance in early September as having an increased chance to develop into a t ropical storm, which would be called Gabrielle, with some forecasts showing a westward track toward the Caribbean.