The disturbance slowly strengthened as it developed a low pressure system.

Following the development of the secondary low, the primary system strengthened slowly before dissipating around 15 hours later.

The system slowly strengthened and developed into a separate vortex.

It slowly strengthened and became a tropical storm 3 days later.

Page moved on a northwestward track for the next couple days while slowly strengthening.

The system initially moved east to northeast while slowly strengthening.

The depression moved west, slowly strengthening to a tropical storm on the 27th.

As the light of day slowly strengthened, so the noises subsided.

It strengthened slowly and moved nearly due west, before reaching storm strength later on July 20.

It slowly strengthened into the first tropical storm of the season two days later.