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Falling Barometer
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Thesaurus
early symptom
falling barometer
gathering clouds
high sign
omen
precursor
preliminary sign
premonitory sign
premonitory symptom
prodroma
prodrome
quarantine flag
red flag
red light
skull and crossbones
storm petrel
stormy petrel
symptom
thundercloud
thunderhead
warning sign
warning signal
yellow flag
yellow jack
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