[G3mInI]

Here are the lines in the ubersound.scr that are used in the single player game with the weather.scr file:

alias thunder1 sound/amb/Amb_Thunder_01.wav soundparms 1.0 0.0 1.0 0.0 3000 6000 auto streamed maps "m5l1"
alias thunder2 sound/amb/Amb_Thunder_02.wav soundparms 1.0 0.0 1.0 0.0 3000 6000 auto streamed maps "m5l1 "
alias thunder3 sound/amb/Amb_Thunder_03.wav soundparms 1.0 0.0 1.0 0.0 3000 6000 auto streamed maps "m5l1 "
alias rain_ext sound/amb/Amb_RainExt_01.wav soundparms 1.0 0.0 1.0 0.0 3000 6000 local streamed maps "m5l1"
alias rain_int sound/amb/Amb_RainInt_01.wav soundparms 1.0 0.0 1.0 0.0 3000 6000 local streamed maps "m5l1"
alias rain_roof sound/amb/Amb_RainRoof_02.wav soundparms 1.0 0.0 1.0 0.0 160 320 local streamed maps "m5l1 "
alias rain_window sound/amb/Amb_RainWindow_01.wav soundparms 1.0 0.0 1.0 0.0 160 320 local streamed maps "m5l1"
alias rain_puddle sound/amb/Amb_RainPuddle_01.wav soundparms 1.0 0.0 1.0 0.0 3000 6000 local streamed maps "m5l1"
alias rain_plant sound/amb/Amb_RainPlant_01.wav soundparms 1.0 0.0 1.0 0.0 3000 6000 local streamed maps "m5l1"
alias wind_weak sound/amb/wind_weak.wav soundparms 1.0 0.0 1.0 0.0 3000 6000 local streamed maps "m5l1"
alias wind_strong sound/amb/wind_strong.wav soundparms 1.0 0.0 1.0 0.0 3000 6000 local streamed maps "m5l1"


You would have to add either dm moh obj at the end in quotations or just your map name whatever you like. These sounds will make the weather much more realistic than just random bg ambience.