09:00 am: The Caronia reports ice at Latitude: 42 N and Longitude: 50 W.
01:42 pm: The Baltic reports ice.
01:45 pm: The Amerika reports 2 large icebergs at Latitude: 41 27' N and Longitude: 50 08' W. This message was not sent directly to the Titanic, but was suppose to be passed on later when the Titanic came within range of a transmitter.
07:15 pm: Temperature drops to 39 degrees (F). The ice warning from the Baltic is finally posted on the bridge.
07:30 pm: The Californian reports passing 3 large icebergs at Latitude: 42 03' N and Longitude: 49 09' W.
09:00 pm: Temperature drops to 33 degrees (F).: The crow's nest is ordered by Second Officer Lightoller to "keep a sharp lookout for ice".
09:20 pm: Captain Smith retires to his cabin.
09:40 pm: The Mesaba reports pack ice, field ice and icebergs in the location of where the Titanic was traveling. There is no evidence that this message ever reached Captain Smith or Titanic's bridge. Apparently, wireless operator Jack Phillips was so preoccupied with sending messages that had accumulated during the day to the land station at Cape Race, he put the ice warning from Mesaba aside.
10:00 pm: Temperature drops to 32 degrees (F).: The Titanic was traveling at 22.5 knots.: The sea is calm, the skies are perfectly clear and the stars appear as brilliant points of light. There is no moon.: Frederick Fleet and Reginald Lee take over lookout duty in the crow's nest. Interestingly, they did not have binoculars.
10:50 pm: The Californian sends a wireless message directly to the Titanic telling them that they were stopped and surrounded by ice. Before the Californian could relay their position (about 20 miles north of Titanic), wireless operator Jack Phillips angrily responded, "Shut up, shut up. You're jamming my signal. I'm busy. I'm working Cape Race". The Californian's wireless operator, Cyril Furmstone Evans, waited patiently and then finally gave up, turned off his equipment and went to bed.: The ocean water temperature is about 28 degrees (F).
11:30 pm: Lookouts Fleet and Lee notice a low-lying mist ahead, but do not see an iceberg. They probably would have sighted the iceberg if they had been issued binoculars.
11:39 pm: Lookout Frederick Fleet picks up a phone that is directly connected to the bridge. Sixth Officer Moody answers the call and is told, "Iceberg Right Ahead!".: The bridge immediately sends a "Stop" signal to the engine room. This is followed by "Full Astern".: Quartermaster Robert Hitchins is urgently ordered to turn the ship "Hard-a-starboard." The Titanic turns to the left.
11:40 pm: Titanic strikes iceberg!: The Titanic begins to flood.: First Officer William Murdoch closes the watertight doors.: Fourth Officer Boxhall arrives on the bridge.: Captain Smith returns to the bridge after the collision and asks First Officer Murdoch, "What have we struck?". Murdoch confirms that Titanic had struck an iceberg.: Smith asks Boxhall to inspect the forward area of the hull.: During the next 15 minutes, Boxhall looks at the damage and discovers that the Orlop deck was flooded forward of the #4 watertight bulkhead.
11:45 pm: Boxhall returns to the bridge and reports his findings.: Smith asks Boxhall to establish Titanic's position.: Captain Smith requests that Thomas Andrews and the ship carpenter "sound the ship" (inspect the damage).

RMS Titanic Timeline