Problem with those is that it’s not nearly precise enough, they usually specify an area or a line moving whatever direction, so many kts, intensifying or not. Not anywhere precise enough to add in the simulator. CAT associated with jetstreams maybe. And often there isn’t anything there anyway as it still is a forecast or some moderate icing reported by a Cessna pilot which turns out to be trace ice for a A320. I think most things, thunderstorms with hail and associated turbulences, mountain waves etc. can be simulated natively. My experience is that AIRMET and SIGMET info is not very reliable.
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