[Illustration: _Part of scope showing typhoon by radar. Eye is above center at right with spiral bands showing. Radar is located at center of picture with surrounding clouds showing as dense white mass due to heavy nearby echo return. Echo from opposite side of typhoon is faint._] [Illustration: _Official U. S. Navy Photograph_ _Looking down into the eye of Hurricane Edna (foreground) on September 7, 1954._] [Illustration: _U. S. Air Force Photo_ _Looking down at the central region of Typhoon Marge in 1951._] [Illustration: _Weather officer in nose of aircraft talking to pilot (left) and radar operator._] [Illustration: _Official Photo U. S. A. F._ _The engineer in a B-29 on hurricane reconnaissance._] _The two scanners ready to signal engine trouble the instant it shows up._ [Illustration: _Official Defense Department Photograph_] [Illustration: _Official Photo U. S. A. F._] [Illustration: _The new plane (B-50) to be used by the Air Force for hurricane reconnaissance._] Some of the most dangerous of the extratropical storms begin as small companions or secondary centers of huge disturbances, generally on the south side, where they grow rapidly in fury and merge with the original cyclones to produce winds of tremendous destructive power. This often happens in the so-called “windy corners” of the world. One of these, and a good example, is Cape Hatteras, on the eastern coast of North Carolina. It is a sort of way station for both the tropical and extratropical varieties. Hurricanes heading northwestward from the Caribbean and curving to follow the coastline, sweep over the Cape, which juts into the ocean at the point where the northward-moving storms still retain great force. In winter, big extratropical cyclones passing eastward across the region of the Great Lakes tend to produce small companions or secondaries in the southeastern states and some of them develop gales of hurricane force by the time they reach Hatteras. Here the cold air masses of the continent, guided by storm winds, are thrown against the warm, moist air from the Gulf Stream. In the reaction, there are towering seas and hazardous gales that are well known to seamen.