Traders noted gas prices were also following oil futures lower. US crude fell more than $2 a barrel on renewed global demand concerns as coronavirus cases in Asia rise, among other things.
Front-month gas futures fell 4.2 cents, or 1.4%, to $2.970 per million British thermal units.
Front-month gas futures rose 2.8 cents, or 0.9%, to $2.994 per million British thermal units.
That kept the front-month in overbought territory with a Relative Strength Index (RSI) over 70 for a seventh straight day for the first time since November 2019.
On its last day as the front-month, gas futures for May delivery rose 2.4 cents, or 0.8%, to $2.897 per million British thermal units.
That increase kept the front-month in overbought territory with a Relative Strength Index (RSI) over 70 for a third day in a row for the first time since August 2020.
The US Energy Information Administration (EIA) said utilities added 38 billion cubic feet (bcf) of gas into storage during the week ended April 16.
That was less than the 49-bcf build analysts forecast in a Reuters poll and compares with an increase of 47 bcf in the same week last year and a five-year (2016-2020) average increase of 37 bcf.
Traders also noted that mild weather this week will likely cause utilities to boost injections into storage by so much that the total amount of gas in inventory will rise above the five-year (2016-2020) average for the first time since the February freeze.
Front-month gas futures rose 1.9 cents, or 0.8%, to $2.541 per million British thermal units.
On Monday a study showed China generated 53% of the world's total coal-fired power in 2020, nine percentage points more than five years earlier.
China has promised to reduce its dependence on coal and bring emissions of climate-warming greenhouse gas to a peak before 2030 and become "carbon neutral" by 2060.