{"id":"S89004927","label":"Polar vortex","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh89004927","normalized_label":"polar vortex","broader":["http://id.loc.gov/authorities/subjects/sh89004928","http://id.loc.gov/authorities/subjects/sh89004929"],"aliases":["Circumpolar whirl","Polar cyclone","Polar low","Polar lows","Vortex, Polar"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh89004927","provider":"lcsh","revision":"329d8faaf7499c02","taxonomy_revision":"f050b5d4780b1289","title":"Polar vortex","url":"/topics/S89004927","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9857473586804180486","address_version":"morton4x16-v1","coordinates":[0,21,14445,64512],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}