Weather and radar experts are examining what many are calling a “mystery cloud” that appeared on Eastern New Mexico and West Texas radars earlier in the week.

U.S. National Weather Service offices in Albuquerque and El Paso have confirmed the reading, but say they have no idea where the several-mile-wide cloud could have come from.

What many observers have called a "plume" first appeared at sunset on Monday evening over the part of the vast White Sands Missile Range.

The plume was tracked north-east, over Cannon Air Force Base near Clovis then over Amarillo.

Radar imagery shows the cloud dissipating over the Oklahoma – Texas State line.

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