On January 8, 2016, 12-24 hr, the EUMETSAT METOP 1-B IASI instrument measured a global mean methane spike of 2963 ppb during the 12-24 hr period.
This spike spears through the previous highest 12 hour reading set on April 25, 2015 of 2845 ppb by an almost 5 percent increase.
What is concerning is that in addition to being unusual, this comes on the heels of the recent January 2, 2016 spike to 2745 ppb, which until yesterday, had been the second highest reading in the METOP IASI record since December, 2012.
Time will tell if the increasing level of spikes and global means continues at an accelerating rate. but these are surprising and sobering numbers.