Shorter and more direct:
* He blew a loud whistle.
* His whistle blared.
* The whistle shrieked.
More descriptive:
* He blew his whistle, the piercing sound cutting through the air.
* The whistle erupted from his lips, a shrill, ear-splitting blast.
* His whistle echoed, a sharp and forceful call.
More specific:
* He blew his whistle, its sharp, metallic tone resonating through the stadium.
* The whistle shrieked, silencing the crowd instantly.
The best choice for you will depend on the context and the tone you want to convey.