original: it formed on july 19 from a trough of low pressure off the southeast u.s. coast .
simplifications: it was caused on july 19 from a trough of low pressure off the southeast u.s. coast . it formed on july 19 from a trough of low pressure off the southeast u.s. coast . it came to be on july 19 from a channel of low pressure off the southeast u.s. coast . it formed on july 19 from a front of low pressure off the southeast u.s. coast . it formed on july 19 from a trough of low pressure of the u.s. coast . it formed on july 19 from a trough of low pressure off the southeast u.s. coast . it started on july 19 from an area of low pressure off the southeast u.s. coast . it has been created on july 19 from a trough of low pressure off the southeast u.s. coast .