An accident at an anhydrous ammonia storage facility south of the town ofNevada in Story County let a cloud of the gas escape. The cloud formed after an accident which happened at about 8:15 this morningaccording to Lieutenant Gary Foster of the Story County Sheriff’sdepartment. The 30-thousand gallon tank was 70-percent full.Foster says 15 farms have been evacuated. The cloud is moving away fromNevada, which is east of Ames.Foster says there are no injuries, yet, and no cause is known. The tank isused for storage by the Heartland Co-op.