霧(きり) kiriが ga急(きゅう)に() kyuuni濃(こ)く() kokuなって natteきた kita。 The fog suddenly got thicker. Literal Fog [subject-が] suddenly thick become-came. 急に ('suddenly, all at once') + 濃くなってくる. The 急に gives the thickening a sharper, more abrupt onset than the gradual だんだん or progressive ~てきている alternatives. weather~くなる (become)~てくる (change over time)
霧(きり) kiriが ga急(きゅう)に() kyuuni濃(こ)く() kokuなって natteきた kita。 The fog suddenly got thicker. Literal Fog [subject-が] suddenly thick become-came. 急に ('suddenly, all at once') + 濃くなってくる. The 急に gives the thickening a sharper, more abrupt onset than the gradual だんだん or progressive ~てきている alternatives. weather~くなる (become)~てくる (change over time)