#YY  MM DD hh mm WVHT  SwH  SwP  WWH  WWP SwD WWD  STEEPNESS  APD MWD
#yr  mo dy hr mn    m    m  sec    m  sec  -  degT     -      sec degT
2025 12 26 00 00  1.5   MM   MM  1.5  6.0  MM  MM VERY_STEEP   MM -99
2025 12 25 18 00  2.0   MM   MM  2.0  7.0  MM  MM      STEEP   MM -99
2025 12 25 12 00  2.5   MM   MM  2.5  7.0  MM  MM VERY_STEEP   MM -99
2025 12 25 06 00  3.0   MM   MM  3.0  8.0  MM  MM      STEEP   MM -99
2025 12 25 00 00  3.0   MM   MM  3.0  7.0  MM  MM VERY_STEEP   MM -99