The lights start off with the flight category representation then displays two flashes that dictate weather conditions. So in your example, Blue will dictate MVFR then flashing white would dictate snow in the area. Red would be IFR then flashing white would be snow in the area. Here's an example of MVFR and Snow.

There are two colors associated with each weather condition. For instance snow will have a bright white, then a grey assigned in the settings by default. This creates the flashing effect. If you prefer not to have this flashing effect, simply assign the same color white to both. Then it would display Blue for a while, then a solid white for a shorter period of time, but won't have a flash. You can change the colors under the "Led Colors Settings".

I should also mention that if you prefer not to display weather conditions, you can turn this off in the "Sectional Map Settings". This will then only display the flight category. If I didn't answer your question properly, bounce back. - Mark

Thanks Mark, I'm in California and there is no snow coming down now so that doesn't make a lot of sense. I checked a few spots and no high wind either. It's a nice weekend here. I don't have the lights on the map so I would need to unravel the string of legs to find out which airports are reporting this.

I did have the level converter part in my box of parts and finally installed it, I thought that may have been an issue. Now I need to remove the diode.