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.

Located roughly midway between the Windward Islands and the west coast of Africa as of 7 a.m., the system is expected to become a tropical depression or storm within the next day or two. As of 7 a.m., it had a 90% chance of forming in the next 48 hours, according to the NHC.

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

The National Hurricane Center on Tuesday said an Atlantic system is expected to develop into the season’s next tropical depression or storm while beginning to forecast a new system to be