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/ Source: Reuters

PERTH, Australia - A tropical cyclone was threatening to hamper the search for missing Flight MH370 in a remote stretch of the Indian Ocean on Monday, as a submarine drone neared the end of its mission with no sign of wreckage.

The search for Malaysia Airlines Boeing 777, which vanished on March 8 with 239 people on board, has narrowed to a 6.2 square mile patch of sea floor about 1,200 miles west of the Australian city of Perth.

The U.S. Navy-owned robotic sub Bluefin-21 was on its ninth mission scanning the largely unmapped stretch of sea bed where pings from a possible "black box" may have been heard.

Bluefin-21 is craned from an Australian ship into the southern Indian Ocean on April 16.LSIS Bradley Darvill / EPA

Authorities said that the search, which has so far been largely unimpeded by weather, may be affected as Tropical Cyclone Jack continued to move south over the ocean.

"Widespread showers are developing with isolated thunderstorms to the north and east south-easterly winds," the Joint Agency Coordination Center said in a statement addressing the weather forecast for the search area.

- Reuters