Hurricane Nolo is approaching Hawaii as a Category 2 storm, bringing the threat of heavy rainfall, flooding, mudslides, strong winds and dangerous seas.

The Big Island is expected to face the strongest impacts as Nolo makes its closest approach from late Friday into Saturday. Forecasters say 10 to 15 inches of rain could fall across eastern and southern parts of the island, with isolated totals reaching 25 inches in higher terrain.

Maui could receive 4 to 6 inches of rain, with some areas seeing up to 10 inches. Other parts of the main islands are expected to receive between 1 and 3 inches. Officials remain particularly concerned about flooding because the ground is already saturated from recent storms.

Nolo is also expected to bring tropical storm-force winds and potentially hurricane-force winds to parts of the Big Island. Stronger gusts are possible at higher elevations, while dangerous seas are expected to affect coastal areas through the weekend.

Hawaii Governor Josh Green has declared a state of emergency as officials prepare for the storm. Schools, government offices and the University of Hawaii have closed in affected areas. Shelters have also opened on the Big Island, while the state has secured hotel rooms for residents who may need to evacuate.

Nolo follows Hurricanes Lala and Lowell, which affected Hawaii in August and September. Lala caused severe flooding on the Big Island, while Lowell impacted Kauai and Niihau.

The storm is part of an unusually active Pacific hurricane season. Nineteen named storms, including three Category 5 hurricanes, have formed in the eastern and central Pacific so far.

Forecasters have linked the season’s activity to exceptionally warm ocean waters and reduced wind shear associated with this year’s strong El Niño. Another two months remain in the Pacific hurricane season.