What does the gold beam above a Foundable mean?

According to this video (starting at 42 seconds), it indicates the difficulty of the Foundable

Yellow = Medium

Orange = Severe

Red = Emergency

Also, if you view this link it says the following:

Keep your eyes peeled for a beam of light shooting up from the Traces you see in the world, these are high-risk Foundables, and as such are worthy of your time.