Simplify the following text for a Grade 10 native English-speaking person.
Original: A decrease in wind shear and relatively warm water around 81 Â F ( 27 Â C ) kept the intensity mostly stationary , keeping Helene as a Category 1 hurricane .
Simplified: A decrease in wind shear and relatively warm water around 81 Â F ( 27 Â C ) kept Helene as a Category 1 hurricane without any big changes to its intensity .