http://www.nyos.lv/?l=2&m=1
“…The Distinguishing particularity 1983 in contrast with any other year of the period with 1929 till 1988 is such, that the value of the amount of atmospheric precipitation, falling out in vicinities of lakes "NYOS" and "MONOUN" in CAMEROON with November 1982 till May 1983 has smaller importance in contrast with importances of the similar values for any other year of the period with 1929 till 1988. The Mentioned distinguishing particularity 1983 was necessary and sufficient condition of triggering of the limnological catastrophes in lake "MONOUN" in1984 and in lake "NYOS" in 1986.In the event of conservation in twentieth first century typical for twentieth century of the trends of the reduction of the amount of the atmospheric precipitation, falling out with November till May in vicinities of lakes "NYOS" and "MONOUN" in CAMEROON, must expect more frequent and more destructive of the limnological catastrophes in the lake.”