On this date..........1962
.................
6:51P.M.: A new message from President Kennedy is transmitted to Premier Khrushchev via the U.S. embassy in Moscow. Kennedy, stressing that it is important that both sides "show prudence and do nothing to allow events to make the situation more difficult to control than it already is," asks the Soviet Premier to direct Soviet ships to observe the quarantine zone. (Document 33, President Kennedy 's Letter to Premier Krushchev, 10/23/62)
7:06P.M.: In a ceremony at the White House, the president signs Proclamation 3504, formally establishing the quarantine. CINCLANT is directed to enforce the blockade beginning at 10:00 the following morning. (The Cuban Crisis, 1962, ca. 8/22/63, p. 130)
8:35P.M.: Fidel Castro tells the Cuban public in a ninety-minute television speech that Cuba will never disarm while the United States persists in its policy of aggression and hostility. Castro denies the presence of offensive missiles on Cuban soil but declares: "We will acquire the arms we feel like acquiring and we don't have to give an account to the imperialists." Castro also categorically refuses to allow inspection of Cuban territory, warning that potential inspectors "had better come ready for combat." (Statement by Castro Rejecting the Possibility of Inspection and Noting That Cuba Has Taken Measures to Repel a United States Attack, 10/23/62; OR 10/31/62)
9:30P.M.: Robert Kennedy , at the suggestion of the president, meets with Anatoly Dobrynin in the latter's office at the Soviet embassy. According to his memorandum on the meeting, the attorney general calls the Soviet missile deployment "hypocritical, misleading, and false." Dobrynin tells Kennedy that, as far as he knows, there are still no missiles in Cuba, and said that he is not aware of any change in instructions to captains of Soviet ships steaming toward Cuba. (Kennedy, pp. 65-66; Schlesinger, p. 514)
10:15P.M.: Robert Kennedy relates his conversation with Dobrynin to President Kennedy and British Ambassador David Ormsby-Gore, who is meeting with the president. Robert Kennedy recalled that his brother first talked about the possibility of arranging an immediate summit with Premier Khrushchev , but then dismissed the idea as useless until Khrushchev "first accepted...U.S. determination in this matter." Ambassador Ormsby-Gore then reportedly expressed concern that the naval quarantine line reportedly has been set at eight hundred miles from Cuba. Ormsby-Gore recommends drawing the interception line closer to the island in order to give the Soviet government more time to analyze their position. President Kennedy agrees and calls Secretary of Defense McNamara to shorten the line to five hundred miles. It is unclear whether the eight-hundred-mile line is ever actually planned; diaries from the quarantine commander, Admiral Alfred Ward, show that he considered even a five-hundred-nautical mile line "excessive." (Personal History or Diary of Vice Admiral Alfred G. Ward, U.S. Navy, While Serving As Commander Second Fleet, ca. 11/28/62; Kennedy, pp. 66-67
Low-level reconnaissance flights over Cuba begin for the first time, supplementing high-altitude U-2 photoreconnaissance. Navy and Air Force F-8U and RF-101 aircraft fly some 158 low-level missions between October 23 and November 15. The Soviet Union responds to the low-altitude flights by employing camouflage where possible. (Department of Defense Press Conference of Robert McNamara , 2/28/63, p. H-1; Interim Report by the Preparedness Investigating Subcommittee on the Cuban Military Buildup, 5/9/63)
Moscow places the armed forces of Warsaw Pact countries on alert. The Soviet government also defers the scheduled release of troops in the Strategic Rocket Forces, air defense units, and the submarine fleet, and it announces that "the battle readiness and vigilance of all troops" has been raised. (The Soviet Bloc Armed Forces and the Cuban Crisis: A Chronology July-November 1962, 6/18/63, p. 52)
A Gallup poll taken on October 23 shows that 84 percent of the U.S. public who know about the Cuban situation favor the blockade while only 4 percent oppose the action. At the same time, roughly one out of every five Americans believe the quarantine will lead to World War III. (Detzer, p. 192)
President Kennedy addressed the country the night before.
https://www.youtube.com/watch?v=EgdUgzAWcrw
"One of our flights was late...." 
https://www.youtube.com/watch?v=PTW3GbTPaXE