 That afternoon, tropical storm warnings were dropped for St. Kitts and Nevis, while hurricane warnings were lowered to tropical storm warnings for the U.S. Virgin Islands.On the evening of September 15, tropical storm warnings were dropped Puerto Rico and the U.S. Virgin Islands, while hurricane warnings were downgraded to tropical storm warnings for Puerto Rico, and all watches and warnings were dropped for the British Virgin Islands.The entire power grid of Puerto Rico was shut down by the government of Sila Maria Calderón as the storm approached to prevent electrocutions and infrastructure damage.