Crude oil prices jumped above $84 a barrel late on Thursday after production platforms in the Gulf of Mexico were shut down ahead of a threatened tropical storm.

Nymex October West Texas Intermediate hit a record $84.10 a barrel, up $2.17, but settled at $83.32, up $1.39 on the day. The October contract expired at the end of trading. The most active November WTI contract was up $1.05 at $80.75.