The US plans for a lot of situations, as does any competent military. Are you trying to say that the US intended to make these strikes all along, rather than in retaliation for strikes against them?
The blockade has contributed to the current famine in Yemen, which the United Nations said may become the deadliest famine in decades. The World Health Organization announced in 2017, that the number of suspected persons with cholera in Yemen reached approximately 500,000 people. In 2018, Save the Children estimated that 85,000 children have died due to starvation in the three years prior.
The U.S. has supported the Arab coalition’s intervention in the war, and the United States Navy actively participated in the naval blockade at the beginning of the intervention. In mid-2015, Washington increased its logistical and intelligence support to Saudi Arabia by creating a joint coordination planning cell with the Saudi military to help manage the war.