What immediate action is required when observers witness the sky shifting to an ominous green or yellow-green color?
Answer
Seek shelter immediately in the lowest level or interior room.
The visual cue confirms characteristics necessary for extreme weather development, requiring immediate execution of the shelter plan without waiting for an official warning.

Related Questions
What visual precursor is most frequently reported before or during severe weather producing tornadoes or large hail?What physics principle explains why the sky appears green during these storms?For the textbook green canopy to form, what condition must the sun meet regarding its position?If a sky appears a muted, almost brownish-green, what intensity of storm core does this suggest?What is the primary limitation regarding the green sky as a prediction tool?What immediate action is required when observers witness the sky shifting to an ominous green or yellow-green color?What does a vivid, almost electric green color paired with a lowered, rotating feature suggest?Why is immediate response crucial when the green sky is observed, according to the text?What causes the normal blue appearance of the sky on a clear day?What colors have devastating tornadoes sometimes occurred under, despite not being green?In which region might the green sky effect be observed more frequently due to weather patterns?