Hurricane Polo was moving toward Mexico’s Baja California peninsula Sunday evening, with forecasters warning of storm surge, high winds and heavy rain that could trigger life-threatening floods and mudslides. The storm was expected to arrive Monday, Sept. 28. Polo had maximum sustained winds of 125 mph, making it a Category 3 hurricane, according to the U.S. National Hurricane Center. It was traveling north at 12 mph about 270 miles west of Cabo San Lucas, at the peninsula’s southern tip. Forecasters said rain from the storm would begin affecting the peninsula overnight, and Polo could bring heavy rain and flooding to parts of the U.S. Southwest later in the week. The Mexican navy said it had assembled personnel and humanitarian aid in the Pacific ports of Guaymas and Mazatlan and sent three vessels that could carry assistance to coastal communities cut off by the storm. San Juanico, a small fishing community on Baja’s Pacific coast, was among the places in Polo’s projected path. The town has only had full-time electricity for a few years, and residents worried washed-out roads could prevent access to medical care. Soldiers arrived Sunday to prepare a shelter and help with emergencies, said Gloriely Robles Meza, a hotel manager. “Our people are concerned about this event,” she said. Meanwhile, Hurricane Nolo was moving farther southwest from Hawaii’s Big Island on Sunday. Its maximum sustained winds had increased to nearly 105 mph, and high-wind, wind and high-surf advisories remained in effect for parts of the island through Sunday evening. Nolo’s outer bands still threatened life-threatening flooding and mudslides. Parts of the Big Island could receive as much as 20 inches of rain, with heavy rain also expected on other islands. More than 120 National Guard members had been activated, part of about 400 statewide after the governor issued an emergency proclamation. President Donald Trump had approved an emergency declaration allowing the Federal Emergency Management Agency to coordinate assistance and provide funding support. The threat comes as Hawaii communities continue to recover from Hurricane Lala, whose heavy rain and winds swept about 100 homes off their foundations on the Big Island. In Naalehu, at the island’s southern end, Peggy McKibbin surveyed silt-covered roads Sunday and pointed to damage from Lala, including a bakery, fire station and hardware store that were destroyed. “Everyone has been very much affected by this,” she said. National Weather Service lead forecaster Bob Oravec said Pacific storm activity was running above average during the peak of hurricane season. He said the pattern is consistent with El Niño years, when the Pacific often sees more tropical storms and hurricanes. Also Sunday, Tropical Storm Rachel formed about 300 miles south of Acapulco, off Mexico’s southwest coast. It had sustained winds of 40 mph, and no coastal watches or warnings were in effect.