Japanese warships noticed on large distance of Oregon, USA according to the U.S. Joint Intelligence Committee. Daily summary dated 15 December 1941

An item referred to COM 13 reporting that according to a reliable R.D.F. 14 December 6:27 AM Japanese units were present on the position latitude 45.00 north and longitude 146.00 west or 1,400 miles off the Pacific coast of Oregon.

according to the U.S. Joint Intelligence Committee. Daily summary dated 15 December 1941

Source

Map Room Papers (Roosevelt Administration) mr0422a. U.S. Joint Intelligence Committee. Daily summary No. 5 Dated 15 December 1941.