MEXICO CITY—Hurricane Pamela was set to dissipate on Wednesday night after knocking down trees, damaging businesses, and flooding streets in the western Mexican state of Sinaloa, the U.S. National Hurricane Center (NHC) and Mexican officials said. Mexico’s National Guard police said officers helped some people trapped in their homes by flooding, and were working to clear debris, and dozens of fallen trees in the beach resort of Mazatlan. Some shops and restaurants in the area were damaged, the National Guard added in a statement. Mexican authorities opened 40 temporary shelters in Sinaloa in anticipation of heavy rains and winds. Reuters images showed palm tree fronds whipping in the wind and a bank with its windows blown out. Sinaloa is the country’s top grower of corn, Mexico’s staple grain, as well as a major producer of tomatoes and other fruits that figure prominently in the country’s agricultural exports to the United …