Seattle passed it around the perimeter in the closing seconds and Loyd was left wide open for a baseline jumper to extend their lead to 80-77. Washington inbounded it with 6.4 seconds left but Natasha Howard intercepted a pass and sealed it at the free-throw line.
Howard finished with 14 points and seven rebounds for Seattle (4-1). Loyd was 10 of 18 from the field with three of the Storm's seven 3-pointers.
Washington was without star Elena Delle Donne. She played only 13 minutes on Sunday because of dehydration.