Sure you can, ArtsLover- just grab them from the first thread and delete the files you don't want. The weather for Shearwater is just ripped from EA worlds anyway, with a few minor tweaks.
The files for the weather/ sea/ sky are as follows:
S3_1F886EAD_00000000_560C0FD7012DA7F3%%+_INI.ini
S3_1F886EAD_00000000_967BC6C3B3808C00%%+_INI.ini
S3_1F886EAD_00000000_FE1F6A95A24A604A%%+_INI.ini
S3_1F886EAD_00000000_2C02B3532B64EB49%%+_INI.ini
S3_1F886EAD_00000000_8DEA7AE7631A026A%%+_INI.ini
S3_1F886EAD_00000000_5E4F8E7B226066CA%%+_INI.ini
S3_1F886EAD_00000000_5E20253AF53E517F%%+_INI.ini
And:
S3_00B2D882_0076A684_ECCBBCB773C02131%%+_IMG.dds
S3_00B2D882_0076A684_7529C26EE8E2A9E6%%+_IMG.dds
S3_00B2D882_0076A684_28C841C9462BCDE0%%+_IMG.dds
S3_00B2D882_0076A684_E422CDDE7FE1F25F%%+_IMG.dds
S3_00B2D882_0076A684_F0A86F660985BF20%%+_IMG.dds
More details here:
http://www.modthesims.info/showthread.php?t=459198