by @Radigan2014. This may be a result of the high altitude clouds found in low-gravity atmospheres [@Marley2012] providing a higher contrast ratio between cloud layers which would enhance the amplitude produced by inhomogeneities in the cloud deck.

As part of a large survey for $J$-band variability in low-mass brown dwarfs with NTT/SofI, we detected variability in 6 young L-type dwarfs [@Vos2019]. We have carried out follow-up monitoring of 2 detections, the late-L objects PSO J318.5338−22.8603 (PSO 318.5-22) and 2MASS J2244316+204343 (2M2244+20) in previous *Spitzer* cycles [@Biller2018; @Vos2018] and here we present follow-up mid-IR monitoring of the three L2–L5 spectral type detections from this survey – (hereafter ), (hereafter ) and (hereafter ).

All three objects show robust evidence of youth and/or low-gravity. The L2 object is a confirmed member of the $50~$Myr old Argus association [@Faherty2016; @Liu2016], and shows signs of very low-gravity in its spectrum [@Gagne2015c; @Allers2013]. @Riedel2019 find that the kinematics of may be consistent with the younger $23~$Myr $\beta$ Pictoris moving group using their LACEwING group membership code [@Riedel2017]. The L3 object is not associated with a known young moving group but shows signs of very low gravity in its optical and IR spectra [@Cruz2009; @Allers2013]. Both 