Updated: Jan 29
It is very common for EZWxBrief users to have their EZRoute Profile (and meteogram) set to the maximum altitude view of flight level 150 (or 15,000 ft). Their justification is that they are flying at or below 12,000 feet so why should they care what's happening at a higher altitude like 30,000 feet?
Here's a good example of why it's important to comprehend the big picture first. Notice that on this route above from KCOS to KBPT, the maximum altitude is set to 15,000 feet. Although there are clouds as you approach your destination, it may be a pretty benign environment other than the IFR conditions. But there are several clues to be aware of. First, notice that the weather depiction along the last part of the route includes convection and IFR conditions (red thunderstorm symbols). That means that EZWxBrief believes it'll be embedded convection.
Second, if you zoom out so that you have the Max Alt set to 500 (50,000 feet), it's pretty clear that the depth of those clouds are significant with tops up to 45,000 feet. This is clearly an indication of deep, moist convection. As you are moving toward adverse weather (as it is for this route), typically you first