Premise: we had about three or four days of that and then all of a sudden a cold front came down and uh temperatures dropped thirty degrees in a very short length of time and uh it has gone down gradually each day this morning it was twenty nine yesterday it was about thirty two uh cars were scraping ice off their cars this morning if they've been sitting out all night

Hypothesis: A cold front came and caused the temperature to drop thirty degrees in a very short time.
Relation: entailment