Continued volatility attributed to front-month expiration saw natural gas futures rocket over the $6/MMBtu mark in early trading Tuesday. Coming off a 56.6-cent gain in the previous session, the October Nymex contract was up an additional 30.4 cents to $6.010 at around 8:45 a.m. ET.

NGI Morning Natural Gas Price & Markets Coverage

November was trading at $6.033, up 30.2 cents.

After a massive move higher Monday coinciding with options expiration, and with the final settlement of the October contract Tuesday, analysts at EBW Analytics Group cautioned that “further sizable moves are possible, particularly later in the day.”

The “proximate cause” for the recent rally is end-of-month positioning, the analysts said, but the prospect of additional liquefied natural gas demand amid “rumors that Sabine Pass Train 6 was...