Siamese warning

This crossword clue is for the definition: Siamese warning.
it’s A 15 letters crossword puzzle definition.
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Possible Answers: HISS.

Last seen on: LA Times Crossword 25 Nov 21, Thursday

Random information on the term “HISS”:

Electromagnetic hiss is a naturally occurring Extremely Low Frequency/Very Low Frequency electromagnetic wave (i.e., 300 Hz – 10 kHz) that is generated in the plasma of either the Earth’s ionosphere or magnetosphere. Its name is derived from its incoherent, structureless spectral properties which, when played through an audio system, sound like white noise (hence the onomatopoetic name, “hiss”).

Hiss may be observed in any of several varieties depending on local time and L-shell of the observer:

There are several proposed generation mechanisms for plasmaspheric hiss in particular, including:

HISS on Wikipedia