Hi Sweenj,
I hope you have made the suggested changes to transforms.conf and props.conf on the indexer(and bounce it), if NOT go ahead and do them on indexer. Once done , on your search head run below command by selecting "Verbose Mode" the dropdown next to search icon which displays "Fast Mode" "Smart Mode" "Verbose Mode". Once you run below command with "Verbose Mode" and the search complete, look for interesting fields on the left hand side and you should see the fields which you listed in the transforms.conf.
sourcetype="forecast" host="node"
Check and let us know
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