The past perfect tense of storm is had stormed.
There is no verb in the past perfect tense in that sentence. The past perfect tense of stop is had stopped. Stopped is the past tense.
The past perfect tense of reach is had reached.
The past perfect tense of "stop" in the given sentence would be: "The storm had stopped in the early afternoon."
The storm had stopped by early afternoon.
Existed is the past tense. The past perfect tense is had existed.
The past tense is bled, and the past perfect tense is had bled.
The past tense of sit is sat; the past perfect tense is had sat.
A storm is blowing.The be verb 'is' shows the tense so change 'is' to the past 'was'.A storm was blowing.
The past perfect tense of hope is had hoped.
The past perfect tense is had submitted.
The past perfect tense is had chosen.
The past perfect tense is "had confronted".