Super Typhoon Rai wreaked havoc across the Philippines. Many cities suffered power outages.

Only after many cities had suffered power outages did Super Super Typhoon Rai wreak havoc across the Philippines

Had Super Typhoon Rai wreaked havoc across the Philippines, many cities would have suffered power outages.

Hardly had Super Typhoon Rai wreaked havoc across the Philippines when many cities suffered power outages.

Were Super Typhoon Rai not to wreak havoc across the Philippines, many cities wouldn’t suffer power outages.