TEGUCIGALPA (Reuters) - Nicaragua and Honduras on Monday scrambled to evacuate citizens from their Atlantic coasts as Hurricane Eta barreled closer and the U.S. National Hurricane Center (NHC) warned of flash floods and “catastrophic winds” in Central America.The storm, a devastating Category 4 hurricane on the five-step Saffir-Simpson scale, was expected to slam the northeast coast of Nicaragua late on Monday or early Tuesday, the Miami-based NHC said. Describing it as a “major hurricane”, NHC said Eta’s rains may cause “life-threatening storm surge, catastrophic winds, flash flooding and landslides” in parts of Central America. Jamaica, southern Haiti, the Cayman Islands, El Salvador and southern Mexico may also be hit. Eta was poised to be one of the most powerful hurricanes to hit Nicaragua in years, and may test President Daniel Ortega, who presides over one of the poorest countries in the Americas. On Monday afternoon, strong winds and heavy rains lashed Nicaragua and the government put regions in the hurricane’s path on red alert. It has evacuated about 3,000 coastal families and sent in supplies to help residents prepare for the storm’s impact, Vice President Rosario Murillo said. Eta could also trigger “destructive” waves in Nicaragua, while water levels could reach 12 to 18 feet (3.7 to 5.5 meters) above normal tide levels, NHC said. In Honduras, the government has placed five Atlantic coast regions on red alert, its highest warning, and evacuations were underway, local authorities said.