-----building sounding to 600mb for    ------------------------------
Array
(
    [0] => ./data/KMFR_1200Z_04_APR_25.txt
    [1] => ./data/KMFR_0000Z_04_APR_25.txt
    [2] => ./data/KMFR_1200Z_03_APR_25.txt
    [3] => ./data/KMFR_0000Z_03_APR_25.txt
    [4] => ./data/KMFR_1200Z_02_APR_25.txt
)