Simplify the following text for a Grade 10 native English-speaking person.
Original: Steering winds ahead of an approaching mid-level trough caused Beryl to accelerate northeastward , and early on July 21 the center of the storm crossed the island of Nantucket .
Simplified: Steering winds ahead of an approaching mid-level trough caused Beryl to speed up northeastward , and early on July 21 the center of the storm crossed the island of Nantucket .